XL2 OPERATING MANUAL HANDHELD AUDIO AND ACOUSTIC ANALYZER
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Table of Contents Table of Contents 1. Introduction......................................................................5 2. Overview...........................................................................7 Operation........................................................................9 The Screen Display....................................................... 11 3. Getting Started..............................................................14 Power Supply . ..........................................
Table of Contents Settings....................................................................... 181 Vibration...................................................................... 184 Scheduler.................................................................... 185 Options....................................................................... 187 Information................................................................. 188 Options.......................................................................
Introduction 1. Introduction Thank you for purchasing the XL2 Audio and Acoustic Analyzer. The XL2 Analyzer forms the unique combination of a state-ofthe-art Sound Level Meter, a comprehensive Acoustic Analyzer as well as a powerful Audio Analyzer.
Introduction Product Configurations The following items are included with the respective model: 6 XL2 without Microphone: • • • • • • XL2 + M2230: • XL2 Analyzer • M2230 Measurement Microphone consisting of -- Microphone PreAmplifier MA220 -- Microphone Capsule MC230 or MC230A • 50 mm Windscreen • Microphone-holder MH01 with Adapter 5/8“ - 3/8“ • Individual Frequency Response Chart • Test Signal CD • Li-Po battery • USB cable • Hand strap • Operating manual XL2 + M2211: • XL2 Analyzer • M2211 Measur
Overview 2.
Overview 1 XLR Signal Input Either a balanced audio signal, an NTi Audio measurement microphone or the microphone pre-amplifier MA220 plug directly into the XLR input. The Automated Sensor Detection (ASD) technology reads the electronic data sheet of any connected NTi Audio device after the 48 V microphone phantom power is activated. 2 RCA Input Unbalanced audio signal input. 3 Voice Note Input Internal microphone for recording voice notes and measuring polarity and delay time.
Overview Operation 2 9 8 6 7 Volume of Speaker and Headphone Output • Press the button briefly to enable or disable the speaker. The speaker is activated and the speaker or headphone icon appears in the upper menu bar. • Press and hold the speaker button 1 A pop-up window for volume is displayed. 5 2 1 . 3 4 Page Control Switches among various screens depending on the menu function selected.
Overview • Hold the speaker button down and adjust the level of the speaker and headphone outputs with the rotary wheel . Digital gain control prevents gain increases beyond a level that will cause signal clipping. The maximum gain setting depends on the connected input signal. • The headphone output provides a linear output signal using the SLMeter function over a measurement range of 57 dB.
Overview The Screen Display The XL2 displays the actual sound levels also in case of no measurement has been started. Any displayed averaged level refers to the previous measurement period. The XL2 shows four lines in case of no previous measurement period is applicable. Display Contrast Setting • Hold down escape and turn the rotary wheel desired contrast is reached. 2 3 4 5 6 7 8 9 until the 1 Updating of display • Numeric values Updated every 500ms independent of the measurement function.
Overview 1 Measurement Results Individual level measurement results.
Overview After a completed measurement, the memory symbol indicates a non-saved measurement report. Your measurement needs to be stored manually. For more details visit the chapter Data Management. 6 7 Speaker/Headphone Indication of enabled rear speaker or headphone output. Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the connection microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected.
Getting Started 3. Getting Started Power Supply The XL2 offers flexible power management options and can be operated either by • Replaceable, rechargeable lithium-polymer (Li-Po) battery (included with the XL2 Analyzer) • 4x AA-batteries • Mains Power Adapter The new battery is charged to approximately 50% and should be fully charged before use with: Battery Charger (optional) Charging Time: approx. 3 hours NTi Audio #: 600 000 332 Mains Power Adapter (optional) Charging Time: approx.
Getting Started Rechargeable Li-Po Battery • Open the battery cover at the rear of the instrument. • Insert the rechargeable battery with the contacts edge first. • Close the battery cover. Switch off the XL2 for faster recharging by mains power adapter or USB connection. 3. 2. Caution • Switch the XL2 off prior opening the battery cover in order to prevent any electronic discharges. • Avoid short-circuits. • Operate and charge the battery between 0°C and 45°C (32°F - 113°F).
Getting Started AA-Batteries Alternatively, the XL2 can be powered by AA type batteries • Open the battery cover. • Insert 4 fully-charged AA batteries, observing correct polarity of the +/- indications in the battery compartment. 2. The polarity alternates with successive batteries. • Close the battery cover. • Switch the XL2 off prior opening the battery cover in order to prevent any electronic discharges. • Use only similar batteries from the same manufacturer.
Getting Started Attaching the Hand Strap To avoid accidentally dropping the XL2, a hand strap is supplied with the instrument. • Pull the loop of the hand strap through the opening. • Pull the other end of the hand strap through the loop. • Pull the hand strap tight. 1. 2. 3.
Getting Started Unfolding the Stand Connecting the XL2 A convenient table stand is attached to the rear of the instrument. Acoustic Measurements Connect an NTi Audio measurement microphone to the XLR input connector of the XL2. • Unfold the stand and rest the XL2 on a flat surface.
Getting Started Audio Measurements: XLR Connection • Connect the source to the XL2 with an XLR cable. • Select the XLR input in the menu. Audio Measurements: RCA Connection • Connect the source to the XL2 with an RCA (cinch) cable. • Select the RCA input in the menu.
Getting Started Switching the XL2 On and Off Select Measurement Function Switching On the XL2 • Navigate with the rotary wheel to the main menu bar. • Confirm with enter to select the measurement function. Press power to switch on the XL2. The main menu window opens There is a brief sound of relays and the display illuminates. Switching Off the XL2 Press power the XL2.
Getting Started Setting the Parameters with the Rotary Wheel • Turn the rotary wheel to navigate within the display screen. The selected parameter is highlighted with a black background. Calibration prior Measurement We recommend the daily calibration of the XL2 Analyzer with the Sound Calibrator. This ensures accurate measurement results. For more details see chapter Calibration. • Confirm with enter . The parameter display flashes and/or available parameters or settings are shown.
Sound Level Meter 4. Sound Level Meter The XL2 provides, together with the measurement microphone, a precise sound level meter for monitoring live sound events and/or environmental noise. Extended Acoustic Pack (optional) The Extended Acoustic Pack offers the following additional features for sound-level and acoustic measurements: The Type Approval Option upgrades the instrument to the XL2-TA, the sound level meter dedicated to certified measurements.
Sound Level Meter The sound level meter offers different pages: Page Selection using the Page Button • Press page to toggle between the 123 SLMeter page and the RTA page. Page Selection using the Rotary Wheel • Select the page 123 SLMeter with the rotary wheel • Confirm with enter . 123 SLMeter: Sound Level Meter Displays the selected broadband sound level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows 3 or 5 results simultaneously.
Sound Level Meter Logging: Setup of Data Logging The XL2 features a powerful sound level meter data logger, which allows you to record all required sound level values during the measurement. In the logging page you set which sound pressure levels shall be logged over time. For details refer to the chapter Logging. Choose between: ALL Logs all sound pressure levels. Selected Logs up to 10 different individually-defined sound pressure levels.
Sound Level Meter Set EQt, L%: Selection of measured levels This page allows setting the following levels: • Moving Time-average Sound Level Gliding Leq with selectable time window from one second to one hour. Four individual levels can be configured. This level is also called “running Leq,T” or “sliding Leq,T”. • Percentile Sound Level -- Allows the individual configuration of seven statistic levels from 0.1% to 99.9% (optional with Extended Acoustic Pack).
Sound Level Meter Overview Numeric Result Page The numeric result page 123 SLMeter displays the selected broadband sound level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows three or five results simultaneously. Individual frequency weighting, time weighting, actual, minimum, maximum and correction values can be chosen for each displayed result.
Sound Level Meter 1 Sound Level Result 1 All sound levels are measured and logged simultaneously. You select which sound levels should be displayed. 4 Change Parameter • Turn the rotary wheel to select the parameter Lxx. • Press enter to open the selection menu and choose the wideband sound pressure level to be displayed. • Turn the rotary wheel to select the required test result parameters and confirm with enter .
Sound Level Meter 6 Actual Measurement Time Counts actual measurement time in hrs:min:sec. Supports time modes: continuous, single and (synchronized) repeat. Timer Mode Continuous (applicable for standard measurements) All values are recorded and monitored continuously after starting a measurement with start . The actual measurement time is shown. Timer Mode Single Automatically stops the measurement after the pre-set measurement time. • Set the required measurement time. • Start the measurement .
Sound Level Meter 8 Timer Mode Repeat Synchronized Provides automated repeated measurements synchronized to the XL2 real-time clock. Press start to begin the measurement. In order to align the selected preset measurement time with the real-time clock, the XL2 shortens the first cycle to match the real-time clock synchronization. All following measurement cycles are synchronized to the real-time clock. For example, the cycle time setting is 30 minutes and the measurement starts at 7.50 a.m.
Sound Level Meter • Capture One of the displayed RTA readings may be captured. Any measurement data can then be compared with this captured reference live on the XL2 Analyzer. For example, compare the RTA spectrum of the left and right speakers. • Select the parameter to be captured. • Confirm with enter , to capture the reading. • Select the upper RTA parameter 15 and choose Capt. • Confirm with enter . 10 The lower RTA reading can be compared with the previously-captured reference data.
Sound Level Meter 14 The cursor readout may be set manually to any frequency band or wide band level. The readout remains at the selected frequency. • Select the frequency with the rotary wheel . • Press enter . • Select the frequency of interest. • Confirm with enter . Broadband Results Actual sound level. The broadband sound pressure level Leq, Lmin, Lmax and Live are displayed here. The Live level is displayed with time weighting Fast.
Sound Level Meter 17 Measurement Unit Select the measurement unit as follows: dB Sound level in dBSPL This measurement unit is permanently selected when an NTi Audio measurement microphone with electronic data sheet is connected. dBu Input level in dBu dBV Input level in dBV V Input level in Volt • The measured sound pressure level is just above the residual noise of the connected NTi Audio measurement microphone.
Sound Level Meter Overload Indication In case the measurement result exceeds the preset measurement range, then limit arrows indicate this overload condition. The arrows are displayed for as long as the overload exists, and at least for a minimum of 1 second. Furthermore, such an overload condition triggers the OVR indication in the bottom line, which remains displayed for the complete measurement period. These overload indications are reset at the start of a new measurement.
Sound Level Meter Sound Level Meter - Getting Started Test Preparations • Connect the measurement microphone to the XL2. • Switch on the XL2 . The XL2 reads the electronic data sheet of any connected NTi Audio ASD microphone and switches the 48V phantom power automatically. Select Displayed Test Result This example describes the setting of the commonly-used actual sound pressure level LAF (level L, frequency weighting A, time weighting F).
Sound Level Meter Select Frequency Weighting Select Time Weighting The pop-up window FREQ WEIGHTING appears. • Select the frequency weighting A. The pop-up window extends with TIME WEIGHTING. • Select the required time weighting; e.g. (=Fast). Installation of the Extended Acoustic Option adds more items to the pop-up window • Confirm with enter . • Confirm with enter .
Sound Level Meter Select Parameter Select Correction Value The pop-up window extends with PARAMETER settings. • Select the parameter live. The pop-up window extends with CORRECTION settings. • Select the parameter off. • Confirm with enter • Confirm with enter 36 . . The pop-up window closes and the measured sound pressure level LAF is displayed.
Sound Level Meter Select further Sound Levels Select Input Range • Select the lowest possible input range based on the maximum level expected during the measurement. Wrong input ranges are indicated by a “<” in front of the measurement value or a flashing OVR message in the lower menu bar. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . The numeric result page and the real-time analyzer page use the same input range.
Sound Level Meter Start Measurement • The XL2 is ready to measure the sound levels LAF, LAeq and LAFmax. • Press start . Stop Measurement and Data Saving • Press stop . The XL2 stores the broadband sound pressure levels and the real-time analyzer results simultaneously. The run indication switches to running . The integrated sound pressure level over time LAeq and the maximum level in the measurement period LAFmax are displayed.
Sound Level Meter Data Post-Processing The XL2 stores all data and audio onto the SD card for direct transfer to a computer. Audio data is stored as .wav files. Data reports and log files are stored in plain text format, which can be opened with any text editor (Notepad, Wordpad, etc.). The data is tab-delimited, so dropping the .txt file into a spreadsheet application will conveniently show the results in columns.
Sound Level Meter RTA Configuration The XL2 displays two different sound pressure levels at the same time. You configure which test results to display; e.g., LZFmax and LZFlive. Select RTA Frequency Weighting The pop-up window FREQ WEIGHTING appears. • Select the frequency weighting Z. • Ensure no other measurement is going on. The run indication should display the stop symbol . • Select the LZF value with the rotary wheel . • Confirm with enter .
Sound Level Meter Select RTA Time Weighting The pop-up window extends with TIME WEIGHTING. • Select the required time weighting; e.g., (=Fast). Select Upper/Lower RTA Parameter • Select the parameter shown to the right of the upper LZF value with the rotary wheel ; e.g. max. • Press enter . The pop-up window PARAMETER appears. • Select the parameter max. • Confirm with enter . • Confirm with enter . • Follow the same instruction and select the lower RTA parameter live.
Sound Level Meter Select Input Range • Select the lowest possible input range according to the maximum level expected during the measurement. Wrong input ranges are indicated by a < in front of the measurement value or a flashing OVR message in the lower menu bar. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . The numeric result page and the real-time analyzer page use the same input range.
Sound Level Meter Stop the Measurement and Data Saving • Press stop . The XL2 stores the broadband sound pressure levels and the real-time analyzer results simultaneously. Reporting A report saves the conducted measurements onto the installed SD Card. The XL2 Supports setting the individual levels to be stored in the report after the measurement is completed. 1 2 3 • Press enter to confirm. The measurement data is stored on the SD Card in ASCII format.
Sound Level Meter Leq, Lmax, The RTA Leq, Lmin, Lmax levels are stored Lmin in the report. All 2 All RTA levels are stored in the report. Report Values Choose between the following result reporting: ALL Records all available sound pressure levels without correction values. Selected Records a subset of up to 10 different levels, including correction values if you require. 44 6 The pop-up window for level selection appears. • Select the reporting level with the rotary wheel confirm with enter .
Sound Level Meter 1 Logging Select Logging with the rotary wheel and press enter to enable the automated logging of test results. On The XL2 logs measurement data every interval dt 2 . Off No Logging 2 Interval Dt Adjust the logging interval. The optional Extended Acoustic Pack offers the additional 100 ms logging. 3 Add Spectra Set the RTA logging for each logging interval here. 4 Log Audio The XL2 logs audio data as a wav-file.
Sound Level Meter 6 Wav-File Recording Log Value Setting Choose between the following settings: ALL Logs all available sound pressure levels without correction values. Selected Logs a subset of up to 10 different sound pressure levels, including correction values if you require. • Select Log Values with the rotary wheel . • Press enter to toggle between All and Selected. 7 Selected Log Values By setting Selected at 5 up to 10 individual log values can be chosen.
Sound Level Meter Sample name of wav-file: MyTest_SLM_000_Audio_FS133.0dB(PK)_00.wav 1 2 3 4 5 1 MyTest File name defined by user. 2 SLM Measurement function. 3 000 Automatically incrementing file number. 4 Audio_FS133.0dB(PK) Audio file with full scale peak level. In case of a Compressed + AGC recording, the file name reads “AGC”; this file contains corrected level information only.
Sound Level Meter Another example is environmental noise monitoring: Listening to the recorded wav-file after the measurement may help to determine the predominant sound source. The XL2 Analyzer preserves the original absolute test signal level in the recorded wav-file. The XL2 Analyzer provides three input ranges to accommodate the wide range of input signals. The dynamic range of the recorded wav-file is set according to the selected input range.
Sound Level Meter Events (optional) The event function is available with the XL2 Extended Acoustic Pack Option. The XL2 Analyzer may be configured to record wav-files and additional noise levels only when triggered, instead of the complete measurement duration. Advantages Reduces the data volume acquired, thereby • Simplifying data post-processing • Saving memory for long-term measurement applications.
Sound Level Meter Trigger Events: on level above/below 14 90 Event Duration Level [dB] 100 1 2 80 13 3 12 4 14 3 70 60 2 5 13 12 6 7 8 Time [seconds] 9 10 Features: • The levels LAeq, LZeq and LCPeak are recorded for the event duration. • Audio data is recorded for the triggered event duration only, thus simplifying data post-processing and saving memory space for long-term measurements. • Setting markers by external key press of the XL2 Input Keypad.
Sound Level Meter 1 2 Trigger Events Choose from the following settings: Off No event triggering on level above Events are triggered at noise levels above the preset value 2 for the start duration 13 . on level below Events are triggered at noise levels below the preset value 2 for the start duration 13 . on ext. key press Events are triggered by external key press.
Sound Level Meter 5 Log Audio The XL2 logs audio data as a wav-file. Choose from the following settings: Off Audio logging is off On Audio logging is activated from measurement start to stop. Events Only 7 Audio logging of triggered events only. 8 For more details read the chapter Wav-File Recording.
Sound Level Meter Event automatically triggered by level. 1 Event triggered or marker added by pressing key 1 of the XL2 Input Keypad. 100 2 Event triggered or marker added by pressing key 2 of the XL2 Input Keypad. 3 Event triggered or marker added by pressing key 3 of the XL2 Input Keypad. 4 Event triggered or marker added by pressing key 4 of the XL2 Input Keypad. 12 Stop Duration See 3 . 13 Start Duration See 2 . 14 Hysteresis See 3 .
Sound Level Meter 15 15 16 16 54 Event Stop Mode and Event Duration on key release The event is recorded as long as the button of the input keypad is kept pressed; the Event period is at least Min. Event Duration long. on ext. keypress The event is stopped by pressing a button on the external input keypad; the Event period is at most Max. Event Duration long. Button Functionality of Input Keypad treat each key separately All four buttons operate individually.
Sound Level Meter How to Setup the XL2 for Triggered Event Measurements • Select the logging page, set Logging On, Interval dt: 00:00:01 and choose the required log values. • Setup the event page. For example, the screenshot below starts the event recording after LAF exceeds 80 dB for 2 seconds and stops after LAF is lower than 70 dB for 3 seconds. Logging Enabled Triggered-event recording requires the activation of sound level logging. Using the default Interval dt: 1 second is recommended.
Sound Level Meter Limits 1 The limit page offers two functions: • Setup of limit LED function; enabling the XL2 to highlight any sound levels that exceed the pre-set limit in orange or red color. The default color is green. • Limit parameter setup for external connected accessories, such as the Digital I/O Adapter PCB, the Limit Light or the Stack Light. These accessories connect to the digital I/O interface of the XL2. LED - Level 1 Select one sound level for the limit LED indication .
Sound Level Meter 5 I/O - Level 1 Setup of the level type 1, which is used to trigger externally connected accessories. • Select the level field with the rotary wheel . • Press enter and select the level for the control of the external accessory. 6 Selected Sound Level Values To set the level values for the control of the externally connected accessory. • Select the Out 1, Out 2, Out 3 or Out 4 level with the rotary wheel and press enter .
Sound Level Meter Correction Value KSET 1 The correction value page offers a measurement wizard for live event monitoring, applicable in case the measurement location differs from the loudest position in the live event area. Measurement Position The goal at live event monitoring is to measure the sound level at the loudest position accessible by the audience. Setting up any sound level measurement at this loudest location is typically not practical, thus an alternative measurement position is chosen.
Sound Level Meter Level Difference Prior to the start of the live event, the level difference between the loudest and the measurement position is measured. The XL2 Analyzer calculates the level difference automatically based on the individual sound level measurements at both locations. This level difference is included in the sound level reading during the live event, and the XL2 thereby displays and records the sound pressure level of the loudest point.
Sound Level Meter • Wait until the measurement is completed. • Position the XL2 at the measurement position. • Turn the rotary wheel to select the parameter RUN next to Measure and press enter . 60 The XL2 measures the sound level at the measurement position for 5 seconds. The timer counts down to zero. • Wait until the measurement is completed. • The correction values k1 and k2 are calculated and displayed including date and time.
Sound Level Meter Manual Setting of Correction Values You may fine-tune the correction values k1 and k2 manually. Such fine-tuning adds the remark “Manually Adjusted” in the log file. • Set the correction value with the rotary wheel The note “Manually Adjusted” is displayed at . 2 • To undo the manual setting turn the rotary wheel the parameter UNDO at 2 . • Confirm with enter . .
Sound Level Meter Locked Run Mode The Locked Run Mode simplifies sound level monitoring. You just need to power up the XL2 and the measurement starts automatically. The measurement continues until you switch off the instrument using the power button . The measurement data is stored by default. • The page button allows toggling between the sound level meter and real time analyzer window. All other buttons are deactivated during Locked Run Mode.
Sound Level Meter 63
FFT Analysis + Tolerance 5.
FFT Analysis + Tolerance 1 14 13 12 Result Symbols / Capture & Start Tolerance Mode This field offers two functions: • Symbols for measurement results 2 Upper result displayed as line. Lower result displayed as bargraph. 11 1 10 2 • Capture & Start Tolerance Mode The displayed readings may be captured as reference reading C1 to C8 for • Comparing measurement results against captured traces with relative or absolute curve display.
FFT Analysis + Tolerance Manage captures Allows to rename captures, clear recorded captures, save captures to the SD Card for export from the XL2 or load captures from the SD Card for import to the XL2. Start tolerance Starts the tolerance mode for passed/ mode failed measurements comparing the actual measurement results against a tolerance band. 2 Measurement Result Actual level result of the indicated frequency band.
FFT Analysis + Tolerance 6 7 Time Weighting Offers selectable time weighting of 0.1, 0.2, 0.5, 1.0 second as well FAST (125 ms) and SLOW (1 second). Applications: Short Time Weighting High resolution in time with minimum averaging Long Time Weighting Low resolution in time with longer averaging Run Indication The run indication shows the measurement status running, paused or stopped.
FFT Analysis + Tolerance 10 Readout Frequency You may select any frequency to read out individual levels. The selected frequency is indicated by the cursor arrow. Choose between the following settings: 11 • • • • Select the readout frequency 10 and press enter . The zoom mode is displayed above the flashing arrow. Select the zoom-in frequency with the rotary wheel . Press limit and zoom the linear frequency scale in or out with the rotary wheel .
FFT Analysis + Tolerance 13 Measurement Unit Select the measurement unit as follows: dB Sound level in dBSPL This measurement unit is permanently selected upon connecting a NTi Audio measurement microphone with electronic data sheet. dBu Input level in dBu dBV Input level in dBV V Input level in Volt 14 Page Selector X-Scale and Parameter Setting 20k Shows FFT result of the frequency band range. 484.38 Hz - 20.453 kHz in a resolution of 140.62 Hz with 143 bins shown on the display.
FFT Analysis + Tolerance FFT Analysis - Getting Started Test Preparations • Connect the measurement microphone to the XL2. • Switch on the XL2 . Configuration The XL2 displays two different sound pressure levels at the same time. You configure to display either the levels Live, Max, Min, EQ or captured results. • Select the upper result parameter with the rotary wheel The 48V phantom power indication in the upper menu bar changes to ASD. The XL2 is ready for acoustic measurements.
FFT Analysis + Tolerance Select Upper/Lower Reading The pop-up window Select reading appears. The pop-up window Select reading mode appears. • Select the integrated averaged reading EQ. All available selections are Z-weighted (= no weighting). • Select EQ for normal absolute display of measurements. • Follow the same instruction and select the lower FFT reading Live. • Confirm with enter . Press start to measure and display the sound levels results indicated with ----.
FFT Analysis + Tolerance Select Input Range • Select the lowest possible input range according to the maximum level expected during the measurement. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . 72 Start Measurement • The XL2 measures the selected sound pressure levels Live and EQ. All available sound levels are Z-weighted (= no weighting). • Press start . The run indication switches to running .
FFT Analysis + Tolerance Stop Measurement and Data Saving • Press stop . The XL2 stores the measurement data automatically. Audio Recording The XL2 Analyzer may record a linear audio file (48 kHz, 24 Bit) of the measurement period together with the FFT data. Just load a txt-file named “fftaudio.txt” in the root directory of the XL2. This requires the installed option Extend Acoustic Pack.
Reverberation Time RT60 Reverberation Time RT60 The XL2 measures the energy decay from 63 Hz to 8 kHz using the Schroeder method in 1/1 octave resolution. The optional Extended Acoustic Pack enables 1/3 octave band resolution from 50 Hz to 10 kHz. Use either an impulse source (e.g., a starter pistol) or an interrupted pink noise as the test signal.
Reverberation Time RT60 RT60 Run Test Page RT60 Result Page 12 11 1 10 18 9 8 17 13 14 7 15 6 16 5 2 4 3 75
Reverberation Time RT60 RT60 Cycle Result Page 1 Set Level Markers Prior to conducting a reverberation time measurement, the environmental noise is measured, and the required energy level of the test signal is determined. • Select SET and press enter vironmental noise. 22 21 to measure the actual en- The required level markers appear in grey color. 2 Input Range Select between the lower, mid and upper input range.
Reverberation Time RT60 4 Measurement Status STAT Displays the actual measurement status. Start and stop the reverberation time measurement with start/stop . The following status information is displayed: ARMED 5 Measurement is waiting for the test signal to exceed at least one measurement trigger marker, then the measurement is triggered automatically. NOISE A sound stimulus signal above the trigger marker is being received. DECAY Decay is being measured.
Reverberation Time RT60 10 11 Measurement Resolution Reverberation time measurement selectable in 1/3 octave or 1/1 octave band resolution. The optional Extended Acoustic Pack enables 1/3 octave band resolution from 50 Hz to 10 kHz. 12 RT60 run test page Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the connection microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected.
Reverberation Time RT60 14 15 Uncertainty Factor The uncertainty factor is displayed in the RT60 average result page. It indicates the uncertainty of the averaged measurement results, reduces as more cycles are measured, and depends on the measured reverberation time and the bandwidth of the individual frequency band; lower bands show a higher uncertainty factor. The number of measurement cycles is displayed at 5 .
Reverberation Time RT60 19 20 Correlation Factor in % The correlation factor is 100% for perfectly linear sound pressure level decay after the sound source has ceased. The natural deviation from this linearity results in lower correlation values. The correlation factor is typically 80 100%. Cycle Reverberation Time Test Result Readout of cycle reverberation time and correlation factor 19 when selection 18 is CYC xx or Last. Correlation Factor. Scale is on the right Y-axis. For more details see 19 .
Reverberation Time RT60 RT60 Measurement - Getting Started Test Signal: Pink Noise Play a pink noise signal through an omnidirectional speaker in the room under test. The sound source should be played for a long enough time period to ensure that a balance between injected and absorbed acoustic energy has been reached. For example the sound reflections should be given enough time to reach all reflective surfaces in the room.
Reverberation Time RT60 Set Level Markers • Select the parameter SET with the rotary wheel press enter . 82 and The environmental noise is measured and the grey level markers are set. Get Ready for the Reverberation Time Measurement • Protect the ears against high sound pressure levels, as the test signals might be very loud. Setting the pink noise level: • Start the pink noise test signal with the appropriate on/off time according to the room. Use an initial low level.
Reverberation Time RT60 Start the Measurement • Press start . The status indication switches to ARMED. • Enable the test signal; e.g., switch on the interrupted pink noise signal or fire a starter pistol. • The black bars have to exceed the grey bars completely. Continue the Measurement Using pink noise: The interrupted pink noise test signal continues with the preset on/off time. The XL2 automatically triggers at each cycle.
Reverberation Time RT60 Stop the Measurement and Read Out the Result • Press stop . • If applicable, switch off the pink noise test signal. • Select the result page RES with page . Read Out the Individual Cycle Result • If multiple cycles have been recorded, then select CYC with the rotary wheel , press enter and select the individual cycle result with the rotary wheel . The average reverberation time for each frequency band is displayed in seconds and the measurement uncertainty in %.
Reverberation Time RT60 Measurements with multiple source and microphone positions Room resonances may be applicable at individual measurement positions. Thus perform RT60 measurements at further positions within the room and average all readings. Overload Indication In case the measurement result exceeds the preset measurement range, then limit arrows indicate this overload condition.
Polarity Polarity Positive/Negative Result Page Polarity measurement is important in matching the left and right speakers for a good stereo sound image. The polarity function measures the polarity of cables, single speakers and speaker cabinets. For testing, use the polarity signal provided on the NTi Audio Test CD or the Minirator test signal generator. 4 The polarity of individual speakers or speaker cabinets might change with the frequency.
Polarity Detailed Result Page 1 5 10 6 Input Selection Select the signal source as follows: • Select Signal Source with the rotary wheel • Press enter to select either Voice Note Mic Use the internal voice note microphone of the XL2 for polarity measurements. This selection disables the rear speaker. XLR Input Measure the acoustic polarity with a measurement microphone. Alternatively, measure the polarity of an electrical signal connected with an XLR audio cable.
Polarity 4 Balance Indicator Indication of the audio signal balance between pin 2 and 3 on the XLR input for input signals > -34 dBu. 7 X-Axis Seven octave bands with center frequencies from 125 Hz to 8 kHz. SUB displays the polarity of Sub-woofers; frequency range < 100 Hz. 8 Relative Level Indicator The grey area shows the measured signal energy within the individual frequency bands. The bands with the biggest energy have the most effect on the actual displayed POSITIVE / NEGATIVE polarity result.
Polarity Polarity Measurement - Getting Started For acoustic polarity measurement you can use the internal voice note microphone, or an external measurement microphone, plugged into the XLR input. The polarity result for left and right speaker cabinets should match for a good stereo sound image. • Feed the speaker cabinet with the polarity test signal of the Minirator. • Adjust the test level (at Minirator or amplifier) until the test signal is clearly heard.
Delay Time Delay Time 1 The delay time measurement function is suitable for accurate configuration of delay line setups, by optimizing the directionality of the signal source. The XL2 measures the delay time between the reference signal and the acoustic signal from the speaker. The acoustic delay settings are displayed, allowing you to easily set the measured delay time into the delay device in the rack.
Delay Time 4 Calculated Distance Distance from measurement position to speaker in meters or feet, based on the defined temperature in °C or °F 5 Synchronization Time Bar The automated synchronization allows delay time measurements without any connected electrical reference signal for 100 seconds using the NTi Audio Test CD or 300 seconds using the Minirator, MR2 or MR-PRO. It displays the time remaining until the next required synchronization.
Delay Time Delay Measurement - Getting Started The delay time measurement is conducted between the synchronized electrical input signal and the acoustic signal measured by the built-in voice note microphone. In this example, the delay between speakers A and B in the illustrated auditorium is measured.
Delay Time • Wait until the XL2 synchronizes to the incoming delay test signal, then the synchronization time bar fills up. • Disconnect the audio cable, with the synchronizing signal, from the XL2, allowing you to move around freely for the delay measurement. When selecting Minirator as the delay signal source, the XL2 has to be synchronized to the signal source again after 5 minutes.
Delay Time Store Reference • Select the displayed 0.0 ms below Act. Delay with the rotary wheel and press enter . The reference result of speaker A is stored for the difference calculation of delay A - B. Measure Sub Speaker B • Start the delay test signal at speaker B. Mute speaker A. • Position yourself with the XL2 at the shown measurement position. The XL2 uses the VoiceNote microphone for the delay test; do not connect any measurement microphone. • Stop the delay test signal at speaker A.
Delay Time Automated Difference Calculation • The delay time difference between speaker A and B is automatically calculated and shown below the Act. Delay result. The delay time is measured. Delay Test utilizes VoiceNote Microphone The XL2 uses the internal VoiceNote microphone to measure the acoustic delay. Do not connect any measurement microphone to the XL2 for the delay time measurement. Measurement Position Do not position the XL2 too close to reflecting surfaces, such as walls or floors.
1/12 Octave + Tolerance 1/12 Octave + Tolerance (optional) The Spectral Limits Option extends the XL2 function range with an RTA analyzer with spectral resolutions from 1/1 octave down to 1/12th octave. Trace capturing, relative curve display and comprehensive tolerance handling are supported in the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
1/12 Octave + Tolerance 1 14 Result Symbols / Capture & Start Tolerance Mode This field offers two functions: • Symbols for measurement results 2 13 Upper parameter displayed as line. 12 1 Lower parameter displayed as bargraph. 11 2 3 10 4 9 • Capture & Start Tolerance Mode The displayed spectral readings may be captured in C1 - C8 for • Comparing measurement results against captures with relative or absolute curve display.
1/12 Octave + Tolerance Start tolerance Starts the tolerance mode for passed/ mode failed measurements comparing the actual measurement results against a tolerance band. 2 5 Measurement Result Actual level result of the indicated frequency band. The cursor readout displays the center frequency and the level of the band indicated by the arrow. Select the lowest possible input range according to the maximum level expected during the measurement; e.g.
1/12 Octave + Tolerance 7 8 Run Indication The run indication shows the measurement status running, paused or stopped. Various measurement settings are locked during ongoing measurements, such as changing the input ranging or the preset measurement time. For passed/failed measurements with the Spectral Limits option the run indication may display A for a preset automated level trigger. Actual Measurement Time Counts actual measurement time in hrs:min:sec.
1/12 Octave + Tolerance 11 Readout Frequency You may select any frequency to read out individual levels. The selected frequency is indicated by the cursor arrow. 12 Setting of Test Result Resolution Set the spectral result display to 1/1, 1/3, 1/6 or 1/12 octave band resolution as follows: • Turn the rotary wheel to select the parameter 12 . • Press enter to open the selection window. • Turn the rotary wheel to select 1/1 OCT, 1/3 OCT, 1/6 OCT or 1/12 OCT • Press enter to confirm.
1/12 Octave + Tolerance 14 Measurement Unit Select the measurement unit as follows: dB Sound level in dBSPL This measurement unit is permanently selected while an NTi Audio measurement microphone with electronic data sheet is connected. Band Listening The selected frequency band of the input signal is audible on the rear speaker or at the headphone output. dBu Input level in dBu • Press and hold the speaker button down. The pop-up window Volume is displayed.
1/12 Octave + Tolerance 1/12 Octave - Getting Started Test Preparations The XL2 reads the electronic data sheet of any connected ASD microphones provided by NTi Audio and switches the 48V phantom power on automatically as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . Configuration The XL2 displays two different sound pressure levels at the same time. You configure to display either the levels Live, Max, Min, EQ, EQ1“, EQ4“ or captured results.
1/12 Octave + Tolerance Select Upper/Lower Reading The pop-up window Select reading appears. The pop-up window Select reading mode appears. • Select the time-averaged sound level EQ. All available selections are Z-weighted (= no weighting). • Select EQ for normal absolute display of measurements. • Follow the same instruction and select the lower spectral reading Live. • Confirm with enter . Press start to measure and display the sound levels results indicated with ----.
1/12 Octave + Tolerance Select Input Range Select the lowest possible input range according to the maximum level expected during the measurement. • Select the input range RNGE and press enter . • Turn the rotary wheel to set the applicable input range and confirm with enter . 104 Start Measurement • The XL2 measures the selected sound pressure levels Live and EQ. All available sound levels are Z-weighted (= no weighting). • Press start . The run indication switches to running .
1/12 Octave + Tolerance Stop Measurement and Data Saving • Press stop . The XL2 stores the measurement data automatically. Audio Recording The XL2 Analyzer may record a linear audio file (48 kHz, 24 Bit) of the measurement period together with the spectral data. Just load a txt-file named “12audio.txt” in the root directory of the XL2. This requires the installed option Extend Acoustic Pack.
1/12 Octave + Tolerance 1/12 Octave - Fast Frequency Response Measurement The XL2 provides fast and accurate frequency response measurement within one second using pink noise. For this purpose, the Minirator MR-PRO generates the test signal “Fast Pink Noise” tailored to this application. Test Signal The test signal “Fast Pink Noise” is not “random”; it contains an absolutely flat spectrum within the cycle time.
1/12 Octave + Tolerance Optimize the Frequency Response The fast frequency response measurement with the test signal “Fast Pink Noise” saves time in optimizing the frequency response of audio devices or speakers. During your settings on the equalizer, you will receive a precise result on the XL2 screen within one second. Test Signal „Fast Pink Noise“ Advantage Frequency response measurements often use the standard Pink Noise in combination with a 1/n octave analysis.
Noise Curves Noise Curves (optional) The Spectral Limits Option extends the XL2 with the Noise Curves measurement function. A noise curve may be used to characterize room noise or other environments. Various standardized international noise curves are the most widely used means for evaluating background sound in buildings, and other facilities such as transit facilities, as well as in other indoor/ outdoor spaces. Residual noise in buildings may be generated from both environmental sources (e.g.
Noise Curves It essentially represents a rumble criterion. The RNC curves also provide a procedure that reduces the result essentially back to the NC curves when systems are well designed and acoustically well-behaved. Following the RNC specification, the XL2 measures the octave-band sound pressure level every 100 ms, followed by processing to determine the applicable room noise criterion (RNC) curve. The minimum measurement time is 20 seconds.
Noise Curves RNC Information Page Noise Curves Result Page 1 12 2 11 13 3 4 5 14 6 10 9 7 8 The standards list the noise criteria in 5 dB steps. The XL2 measures the noise criteria in detailed 1 dB steps, which are calculated by linear interpolation between the standardized 5 dB levels. 110 The RNC information page is available when viewing Noise Criteria and Room Noise Criteria results, in accordance with ANSI S12.2-2008. It reports any large fluctuations or surging at low frequencies, e.g.
Noise Curves 1 Noise Curve Selection of the noise curve type and measurement result. Noise Curve Types • Noise Rating NR • Noise Criteria NC (2008) and (1995) • Room Noise Criteria RNC • Room Criteria RC (1995) • Preferred Noise Criteria PNC (1971) Measurement Result The noise rating of a spectrum is designated as the value of the highest curve “touched” by the measured octave-band spectrum. The octave band in which this “touching” occurs is noted along with the curve designation.
Noise Curves 7 Live View Select the LiveView with the rotary wheel to get an overview of the current noise level. Alternatively press the limit button . 9 Timer Mode Continuous (applicable for standard measurements) All values are recorded and monitored continuously after starting a measurement with start . The actual measurement time is shown. The XL2 measures the noise curve after pressing the start button . This will provide the noise rating measurement in accordance with all standards.
Noise Curves 11 Readout Frequency You may select any frequency to read out individual levels. The selected frequency is indicated by the cursor arrow. 12 SIL Measurement Result The speech interference level (SIL) result is shown for noise curve types NC-2008 and NC-1995 1 . It is calculated by averaging the octave-band sound pressure levels at 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz.
Noise Curves Recommendations Recommended NC and RNC Curve Equivalent Sound Level RC curve Conference rooms 25-35 35-44 25-35 (N) RC curve Recommended NC and RNC Curve Equivalent Sound Level Concert halls 15-18 - - Hospitals and clinics 25-45 35-52 25-40 (N) Small auditoriums 25-30 35-39 - Movie theaters 30-40 39-48 - Large auditoriums 20-25 30-35 - Churches 30-35 39-44 25-35 (N) Broadcast studios 15-25 16-35 - Courtrooms 30-35 39-44 25-35 (N) Drama theaters 20-25
Noise Curves Noise Curves - Getting Started Configuration • Select the noise curve type with the rotary wheel . Test Preparations The XL2 reads the electronic data sheet of any connected ASD microphones provided by NTi Audio and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . The 48V phantom power indication in the upper menu bar changes to ASD. The XL2 is ready for acoustic measurements.
Noise Curves Start Measurement • Press start . Stop Measurement and Data Saving • Press stop . The run indication switches to running . The actual noise level LZeq of the selected octave band is displayed. The parameter RUN flashes in the memory menu. The Y-axis adjusts automatically according the measurement result. The XL2 stores the measurement data automatically. • Press enter to confirm. The measurement data is stored on the SD Card in ASCII format. 116 The measurement is completed.
Noise Curves 117
STIPA Speech Intelligibility STIPA (optional) The STIPA analyzer option allows reliable measurement of the speech transmission index (STI) within 15 seconds. Besides the single value STI or CIS (= common intelligibility scale) test result, a detailed view of the modulation indices and individual band level results is provided. The STIPA analyzer meets the latest standard edition 4.0 IEC 60268-16, released in 2011.
STIPA STIPA Table Result Page STIPA Numeric Result Page 10 1 9 8 2 7 3 4 5 6 11 12 13 14 Use only the original NTi Audio test signal for speech intelligibility measurements with the XL2.
STIPA STIPA Averaging STIPA Ambient Noise Correction 24 18 23 15 19 16 21 17 20 1 120 22 Run Indication This icon displays the run status of the measurement.
STIPA 2 3 4 5 Measurement Result • Single value speech transmission index result. • Repeatability of measurement result: Since a dedicated noise test signal is used, the result may deviate by a of maximum 0.03 STI (=Max-Min) at the same measurement position. Sound Level LAeq Shows the time-averaged sound level of the 15 seconds measurement cycle time. Sound Level LAS Actual sound pressure level.
STIPA 7 Measurement Unit The speech intelligibility result is displayed in STI (Speech Transmission Index) or CIS (Common Intelligibility Scale), whereby CIS is calculated as CIS = 1 + log STI. 9 Progress Bar Measurement status indication; a single speech intelligibility measurement takes 15 seconds. The actual measurement time and measurement status are indicated here. 8 Edition of Standard IEC60268-16 10 Page Selector Select between these pages: ed4.
STIPA 13 14 STIPA Modulation Ratio mr1, mr2 For good speech intelligibility it is mandatory that the integrity of the transmitted voice signal modulations are preserved. Therefore STIPA is based on measuring the MTF (Modulation Transfer Function). This function quantifies the degree to which the voice modulations are preserved in individual octave bands. The STIPA method determines the MTF by analyzing the seven frequency bands.
STIPA 20 Source of Data Informs about the source of the ambient noise data. The choices are: • Default Settings • Edited manually • Measured Date Time Question Mark ? at individual Octave Bands Individual octave bands are marked with ? in case of a • Missing test signal level • Invalid modulation indices (mr1 or mr2 > 1.3) • Changes in ambient noise or any impulsive noise during the measurement This information is documented in the measurement report. Flashing Question Marks ?.
STIPA STI Measurement - Getting Started Test Preparations The XL2 reads the electronic data sheet of the connected NTi Audio measurement microphone and switches the 48V phantom power automatically on as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2 . Start STIPA Test Signal Select the STIPA signal source according your application requirements. • Switch on the STIPA test signal at the signal source.
STIPA Start Measurement • Press start . The progress bar switches to RUNNING. The test result tendency is shown on the bargraph, marked with Bad, Poor, Fair, Good and Exlnt. Stop Measurement and Data Saving After the period of 15 seconds the speech intelligibility measurement finishes automatically. The progress bar indications switches to FINISHED and the final test result is displayed. The measurement result is stored automatically. • Switch off the STIPA test signal. • Press enter to confirm.
STIPA Averaging of STI Results The standard IEC 60268-16 recommends averaging two or three subsequent results taken at the same measurement location. Start Averaging • Select the averaging page Avr. The German Standard VDE 0833-4 requires performing minimum three subsequent measurements for one measurement position in case of STI < 0.63. The XL2 Analyzer offers automated averaging of two up to eight speech intelligibility results based on these standard requirements.
STIPA Add Cycles • Press enter Finish to confirm Add Cycle. • Repeat the measurement at the same position as required. 128 The XL2 performs further measurements and adds them to the list. • Choose Finish to end the averaging. The speech intelligibility average and the deviation is displayed for documentation.
STIPA Display of STIPA Numeric Result Page The symbol played. indicates that the averaged STI value is dis- Ambient Noise Correction Measuring the speech intelligibility index under realistic environmental conditions is often not feasible; e.g., playing the test signal in a railway station at emergency levels during peak hours will irritate passengers.
STIPA Enable Ambient Noise Correction • Select the correction page Cor. • Turn the rotary wheel to select the parameter Ambient Noise Correction and press enter . The correction enables and the XL2 displays this screen: Commissioning New PA-Systems New announcement systems are commissioned e.g. at public areas prior the grand opening. Thus the actual ambient noise caused by the public is not available yet during the speech intelligibility measurement.
STIPA Measure Ambient Noise • Position the microphone at the STIPA measurement point. • Select Measure (without any test signal presence). STI Measurement • Select the STIPA result page 123. • Perform the speech intelligibility measurement. The XL2 measures the ambient noise and displays the LEQ octave band result. You may edit the noise data. The XL2 displays the corrected speech intelligibility result in large font. The actual measured result is listed below in smaller font.
STIPA Data Post-Processing In the case when no ambient noise correction has been carried out on-site with the XL2 Analyzer, you may post-process your measurement data on the PC. The NTi Audio STI Reporting Tool combines the speech intelligibility measurement taken with quiet conditions and the actual ambient noise caused by the public, e.g. during day-time. This emulates the speech intelligibility expected during real-life conditions.
STIPA Hints: German Standard VDE 0833-4 Requirements STI > 0.63 One single measurement is sufficient. STI < 0.63 Perform three subsequent measurements at this measurement position. • If the maximum result deviation of these three measurements is > 0.03 then a further three measurements shall be performed. • If the maximum result deviation of these measurements is > 0.05 then the cause of this instability shall be evaluated and removed.
STIPA Hints: Measurement • Select measurement positions as stipulated by local regulations. As a guideline, typically position the microphone at 1 - 1.2 meters above ground in sitting areas or 1.5 - 1.8 meters in standing areas. Also, directly in front of the speakers or very close to a wall are examples of positions that are not typical. • The person taking the measurements should be out of the acoustic field, so as not to affect the measurement results.
Audio Analyzer 6. Audio Analyzer The XL2 offers a comprehensive audio analyzer. Broadband or wideband measurements are offered by the measurement functions RMS/THD+N and Oscilloscope. The following measurement functions offer detailed analysis of the audio spectrum in Volt, dBu and dBV: • SLMeter/RTA • FFT • 1/12 Oct+Tol (optional) Just change the measurement unit according your requirements. See the individual chapters for more details.
Audio Analyzer 1 136 Filter Z-Weighting Frequency Z-weighting with flat frequency response from 20 Hz to 22 kHz. Default measurement setting. A-Weighting Frequency A-weighting according IEC 61672 for low noise levels. C-Weighting Frequency C-weighting according IEC 61672 for high noise levels. HP-100Hz Highpass 100 Hz, -200 dB/dec., maximally flat magnitude filter, e.g. -60 dB @ 50 Hz HP-400Hz Highpass 400 Hz, -120 dB/dec.
Audio Analyzer 5 Balance Indicator Indication of the audio signal balance between pin 2 and 3 on the XLR input for input signals > -34 dBu. The input signal is balanced. The signal is unbalanced. The level at pin 2 is higher than at pin 3. The signal is unbalanced. The level at pin 3 is higher than at pin 2. PreNotch Listening The input signal is audible at the rear speaker or headphone output. • Press and hold down the speaker button . The pop-up window volume is displayed.
Audio Analyzer PostNotch Listening The main frequency component is filtered out by a notch filter, leaving only the remaining signal audible. • Press the speaker button ume window. • Additionally press enter to display the vol- The scope function visualizes the waveform of the electrical input signal. It automatically triggers to the fundamental frequency and selects the scaling of the X-axis (time) and Y-axis (level) accordingly.
Vibration Meter 7. Vibration Meter VibMeter / Spectrum The Vibration Option turns the XL2 Audio and Acoustic Analyzer into a professional vibration meter with broadband measurements and spectral analysis in 1/3 or octave resolution. The XL2 Vibration Meter determines vibration acceleration, velocity and deflection with standard-compliant weighting filters in the frequency range from 0.8 Hz to 2.5 kHz. Detailed recording of measurement data and audio files allow for comprehensive evaluation and reporting.
Vibration Meter 123 Values: Vibration Meter Displays the selected broadband vibration level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows 2 up to 4 results simultaneously. The display of the actual or maximum level can be selected with the applicable frequency weighting. The peak levels PK or P-P are real peak levels. Spectrum: Constant Percentage Bandwidth CPB Displays the 1/3 or 1/1 octave spectrum of the selected RMS vibration level.
Vibration Meter Overview Numeric Result Page The numeric result page 123 Values displays the selected broadband vibration level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows 2 up to 4 results simultaneously. The display of the actual or maximum level can be selected with the applicable frequency weighting.
Vibration Meter 1 Vibration Level Result 1 All vibration levels are measured and logged simultaneously. You select which vibration levels should be displayed. 3 Change Parameter • Turn the rotary wheel to select the parameter Lxx. • Press enter to open the selection menu and choose the wideband vibration level to be displayed. • Turn the rotary wheel to select the required test result parameters and confirm with enter . Change Font Size • Turn the rotary wheel to select the actual test result.
Vibration Meter • Capture One of the displayed frequency band readings may be captured. Any measurement data can then be compared with this captured reference live on the XL2 Analyzer. • • • • 5 6 Y-Scale setting • Select the Y-Axis with the rotary wheel and confirm with enter . • Select the zoom factor between 20, 10, 5, 2.5 dB/div and confirm with enter . • Scroll up and down with the rotary wheel to select the Y-axis range. • Confirm with enter .
Vibration Meter Octave band resolution 4 Hz - 2.0 kHz frequency band levels including wide band result 1 Hz - 0.5 kHz frequency band levels including wide band result 1 Hz - 2.0 kHz frequency band levels and confirm • Select the X-Axis with the rotary wheel with enter . • Toggle with the rotary wheel between the ranges. • Confirm with enter . 9 10 144 Broadband Results Displays broadband level B. Filter Select the preset frequency filter here, which is already used on the broadband page.
Vibration Meter FFT Analysis + Tolerance The XL2 Vibration Meter includes a fast real-time FFT. 9 The following features are available upon installing the Spectral Limits Option in the XL2 Analyzer: • High-resolution Zoom-FFT up to 0.4 Hz steps in the frequency range 1 Hz - 20 kHz • Capture and tolerance function provided with Spectral Limits Option; thus the main menu function reads FFT + Tol.
Vibration Meter 1 Result Symbols / Capture & Start Tolerance Mode This field offers two functions: • Symbols for measurement results 2 Manage captures Upper result displayed as line. Start tolerance Starts the tolerance mode for passed/ mode failed measurements comparing the actual measurement results against a tolerance band. Lower result displayed as bargraph.
Vibration Meter 3 Y-Scale setting • Select the Y-Axis with the rotary wheel and confirm with enter . • Select the zoom factor between 20, 10, 5, 2.5 dB/div and confirm with enter . • Scroll up and down with the rotary wheel to select the Y-axis range. • Confirm with enter . 4 Measurement Result Displays the actual and averaged measurement results. 5 Time Weighting Offers selectable time weighting of 0.1, 0.2, 0.5, 1.0 seconds as well FAST (125 ms) and SLOW (1 second).
Vibration Meter 7 Zoom Mode (optional, applicable with the Spectral Limits Option) • • • • Select the readout frequency 10 and press enter . The zoom mode is displayed above the flashing arrow. Select the zoom-in frequency with the rotary wheel . Press limit and zoom the linear frequency scale in or out with the rotary wheel . • Release limit and scroll the linear frequency scale left or right with the rotary wheel .
Vibration Meter 9 Page Selector X-Scale and Parameter Setting 1k7 Shows FFT result of the frequency band range. 23 Hz - 1.687 kHz in a resolution of 11.72 Hz with 143 bins shown on the display. 400 Shows FFT result of the frequency band range. 5 Hz - 421.02 Hz in a resolution of 2.92 Hz with 143 bins shown on the display. 100 Shows FFT result of the frequency band range. 1 Hz - 105.00 Hz in a resolution of 0.73 Hz with 143 bins shown on the display.
Vibration Meter 1/12 Octave + Tolerance (optional) 8 The Spectral Limits Option extends the function range of the XL2 with trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
Vibration Meter 1 Result Symbols / Capture & Start Tolerance Mode This field offers two functions: • Symbols for measurement results 2 Manage captures Upper result displayed as line. Start tolerance Starts the tolerance mode for passed/ mode failed measurements comparing the actual measurement results against a tolerance band. Lower result displayed as bargraph.
Vibration Meter 3 Y-Scale setting • Select the Y-Axis with the rotary wheel and confirm with enter . • Select the zoom factor between 20, 10, 5, 2.5 dB/div and confirm with enter . • Scroll up and down with the rotary wheel to select the Y-axis range. • Confirm with enter . 4 Measurement Result Displays the actual and averaged measurement results. 5 Time Weighting Offers selectable time weighting of 0.1, 0.2, 0.5, 1.0 seconds as well FAST (125 ms) and SLOW (1 second).
Vibration Meter 7 Setting of Test Result Resolution Set the spectral result display to 1/1, 1/3, 1/6 or 1/12 octave band resolution as follows: • Turn the rotary wheel to select the parameter 12 . • Press enter to open the selection window. • Turn the rotary wheel to select 1/1 OCT, 1/3 OCT, 1/6 OCT or 1/12 OCT • Press enter to confirm.
Calibration 8. Calibration The XL2 Audio and Acoustic Analyzer meets or exceeds the specifications listed in the chapter Technical Data. Instrument Calibration In order to maintain the high accuracy, annual calibration of the XL2 Analyzer and the measurement microphone is recommended. The calibration service verifies the complete product specifications, differences to the last calibration and measures the frequency response of the measurement microphone.
Calibration Calibration Menu with connected Measurement Microphone Calibration Menu without any connected Sensor 1 8 7 6 5 4 2 9 3 155
Calibration Calibration Menu with connected ICP Adapter ASD and Accelerometer 1 Phantom Power Supply 48V The XL2 provides 48 V phantom power supply to the connection microphone or sensor. ASD An NTi Audio measurement microphone with automated sensor detection ASD is connected. The XL2 reads the electronic data sheet of the microphone and switches the 48V phantom power automatically on 48V Phantom power is switched off.
Calibration 5 Start Field Calibration Select RUN and press enter to start the sensitivity setting using an external calibrator. 6 Level of External Calibrator The reference calibration level is 114 dB. The XL2 Supports a level setting between 0 dB and 200 dB. 7 8 Sensitivity Applicable microphone sensitivity in the range from 1 µV/Pa to 9.99 V/Pa. The sensor detection of the XL2 reads the sensitivity automatically from the electronic datasheet of the connected NTi Audio microphone or preamplifier.
Calibration 10 Unit Selection Accelerometer Sensitivity The accelerometer sensitivity is provided in the range of • 1 µV/(m/s2) - 10.0 V/(m/s2) or • 10 µV/g - 100 V/g Field Calibration - With External Sound Calibrator Field-sensitivity setting for measurement microphones with an external calibrator. • Turn the rotary wheel to select the parameter User Calibration 6 and press enter . • Set the calibration level according to the calibrator used.
Calibration Free-field Correction The following free-field correction shall be applied using the NTi Audio Class 1 Sound Calibrator • M2230, M2211, M2215: -0.1 dB Example - Field Calibration • Configuration -- XL2 + M2230 Measurement Microphone -- NTi Audio Class 1 Sound Calibrator @ 114.0 dB The following correction shall be applied using the NTi Audio Class 1 Sound Calibrator with 1/4” adapter ADP 1/4-P • M4260: +0.1 dB • M4261: +0.2 dB • The level 1 at User Calibration shall be set to 113.9 dB (=114.
Calibration Applying Correction Values @ M2230 The goal is to measure the sound pressure without the influence of the microphone in the air. However, the presence of the microphone body in the free-field environment affects already the sound pressure level at high frequencies. The measurement microphone acts at high frequencies like a reflector. The sound pressure increases in front of the microphone capsule membrane. For example, the sound pressure level is 114.
Profiles 9. Profiles Profiles are templates of measurement setups. You may define which profile is loaded at startup, so that the measurements are carried out always with the same setup and instrument settings. Profiles - Getting Started Activate Profile Selection at Startup • Select Show profile list 1 in the System menu. • Press enter to activate Yes. This will show the profile list at startup. A remarkable advantage of the XL2 is the flexible user interface.
Profiles Preset Measurement Function Store MyProfile • Start the XL2 Analyzer in Full mode. • Select the typically-used measurement function and adjust the measurement parameters according to the requirements. • Select Profile in the main menu and press enter For example, measuring the sound levels LAF, LAeq and LAFmax for 10 seconds: 162 The profile menu opens. .
Profiles • Select Manage and press enter . The Manage Profile menu opens. Each stored profile includes all settings of all measurement functions and pages. Only the following details are not stored: • Calibration settings • System settings • Temperature unit • Phantom power on/off • Select Save Profile and press enter . The Save Profile menu opens. • Select Rename and press enter . • Set the profile name to MyProfile. The maximum name length is 20 characters.
Profiles • Select Configure available screens and press enter . Select Profile at Startup • Switch on the XL2 • Select additional available pages/measurement functions for the profile; e.g. RTA . • Press escape to return to the Save Profile screen. • Set Append mode available: yes in order to have the append data feature available in the memory menu . • You may enable manual measurement range setting within your profile. Select Allow manual ranging: yes.
Profiles Select Profile during Operation • Select Profile in the main menu and press enter The profile menu opens. . Run Measurement The profile name is displayed when a measurement function is highlighted. The main menu offers only the measurement functions enabled by the profile, plus the calibration and profile menu. • Press start . • Choose Select and load the required profile. • Wait 10 seconds until the measurement is finished.
Profiles Export MyProfile to PC If you have two or more XL2 Audio and Acoustic Analyzers, you may like to transfer the same profiles to the other instruments. • Select Profile in the main menu and press enter • Select Manage and press enter . • Select Export to SD-Card and press enter . The XL2 generates a folder on the SD Card called “Profiles”. All available profiles are exported into this folder. • Connect the XL2 to the PC. • Copy/paste the profile called MyProfile to the PC. 166 .
Profiles The XL2 can store up to 20 individual profiles in the internal system memory and offers three different profile types: Types Factory default profiles Description The XL2 includes factory default profiles, which are marked with “#” in the beginning of the file name. Sample filename: #DIN15905-5.prfs The factory default profiles are a free download for all registered XL2 customers on the support website at https://my.nti-audio.com. For details see the chapter My NTi Audio.
Capture + Tolerances 10. Spectral Limits Option (Capture + Tolerances) Capture the EQ Measurement Results • Select the Capture & Start Tolerance Mode symbol for capturing the measurement result. The Spectral Limits Option extends the function range of the XL2 with trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and the high resolution 1/12 Oct + Tol spectral analysis.
Capture + Tolerances A pop-up window appears. • Select Capture EQ. • Confirm with enter . The pop-up window ... and store it to appears. • Select C1. • Confirm with enter and set the capture name in the displayed letter selection box e.g. to Ref. The capture has been stored in the internal XL2 memory.
Capture + Tolerances Edit Capture Manually • Select the Capture & Start Tolerance Mode symbol. • Confirm with enter . • Select Manage captures. • Confirm with enter . • Select Save to SD card. See the difference between Live Level and Capture • Blank the upper parameter by setting ----. • Select the lower parameter with the rotary wheel . • Confirm with enter . • Select Live and confirm with enter . The pop-up window Select reading mode appears. The pop-up window Save captures appears.
Capture + Tolerances The relative difference between the Live level and the captured reference is displayed. Manual Editing of Capture Data Kindly observe the following rules while manually editing capture data: • The spectral level data is Z-weighted, thus the sum of all %1/12 Octave Analyzer Capture bands has to equal the Z-weighted broadband level. %ͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲDO NOT EDIT THIS SECTIONͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲͲ • The A and C-weighted broadband levels are calculated ob#Capture time serving22.04.
Capture + Tolerances Start Tolerance Mode for Passed/Failed Measurements • Select the Capture & Start Tolerance Mode symbol with the rotary wheel . • Confirm with enter 172 . A pop-up window appears. • Select Start tolerance mode. • Confirm with enter .
Capture + Tolerances Passed Result The pop-up window Make tolerance from appears. The tolerance mode is active for passed/failed measurements. The passed/failed condition is further visualized by the bicolor “limit” button and forwarded to the I/O interface of the instrument in order to drive an external alarm device such as the accessory SPL Stack Light. 2 3 1 • Select Ref to load the earlier captured reference spectrum. • Confirm with enter .
Capture + Tolerances 1 PASSED / FAILED Result PASSED The actual measurement result is within the tolerance band. Failed Result The XL2 Analyzer compares spectral measurements against a tolerance band and visualizes exceptions 1 in every frequency band. The actual measurement result is outside of the tolerance band. Exceptions are visualized in any out-of-tolerance frequency band. 2 Tolerance Bandwidth Adjusts the tolerance bandwidth based on the captured reference spectrum in dB.
Capture + Tolerances Tolerance Menu 1 2 Advanced Start Functions You may start the passed/failed measurement in one of the following ways: • Press the XL2 start button . • Activate the automated level trigger in the tolerance file. • Activate the digital input 1 via the external I/O interface; e.g. a foot switch or a PLC control. 3 Digital I/O Interface Result Passed: Result Failed: Start Measurement: 1 Capture & Start Tolerance Opens capture and tolerance menu.
Capture + Tolerances Create Tolerance Files Manually on PC • Capture a spectrum on the XL2 Analyzer. • Enter the tolerance mode and generate a tolerance band for the capture. • Select the Capture & Start Tolerance Mode symbol. • Confirm with enter . • Select Save tol. to SD Card to export the capture tolerance file. This file includes the reference capture and the tolerance data. The XL2 generates a txt-file in the folder “Tolerances”. • Open the capture tolerance file with a text editor or MS Excel.
Capture + Tolerances Band-limited Measurement Range Alternatively to the settings on the XL2, the tolerance may also be limited to a range of frequency bands or a number of individual frequencies on a computer. • • • • • The XL2 shows selectable broadband values with A, C or Zweighting on the right hand side of the spectrum. Open the tolerance file on the computer. Delete all not required frequency bands. Set #Hide UnusedBands to True. Save the file changes. Load the updated tolerance file in the XL2.
Capture + Tolerances #Unit dBr #Mode HighLow #Columns Frequency Min Ideal #Unit dBr (relative), fixed setting #Mode Describes tolerance type; the XL2 allows setting of the tolerance type independently of the tolerance file.
Capture + Tolerances #ZTolerances Defines the tolerance band for the Z-weighted wideband level (not mandatory). #BandSum Tolerances Defines the tolerance band for the sum of displayed frequency bands (not mandatory). #Band Tolerances • Defines the tolerance band for the individual frequencies. • The ideal parameter can be set as “undef”. • The same frequency value on two successive rows defines a tolerance step, e.g.
Capture + Tolerances #FreqScale Spacing #AutoStart Defines the frequency scale spacing in the Xaxis for the tolerance data. (not mandatory) lin Tolerance data displayed with linear frequency spacing, e.g. used in the FFT function. (default setting) log Tolerance data displayed with logarithmic frequency spacing e.g. used in the 1/12 Oct + Tol function. Enables auto start function. (not mandatory) True False 180 Auto start is active. The run indication displays A.
System Settings 11. System Settings 2 The various system settings of the instrument can be adjusted as follows: Turn the rotary wheel to navigate to the main menu 1 and select System. Confirm with enter .
System Settings 4 Backlight Toggle the backlight with the power/backlight button The backlight offers three different conditions: • On • Dimmed • Off Auto On/Off The backlight switches off if no key is pressed for 2 minutes. Auto On/Dimmed The backlight dims if no key is pressed for 2 minutes. Manual The backlight can be toggled between On, Dimmed and Off. • Navigate the cursor to the backlight function. • Toggle with enter to set this parameter.
System Settings 6 Show Profile List You may configure the XL2 to start up with individual preset application profiles. For example, sound level monitoring in accordance with DIN 15905 or V-NISSG. Yes No 7 The instrument starts up with default application profiles. Further details about the application profiles are in the chapter Profiles. The instrument starts up in the last configuration without any application profiles.
System Settings 10 Decimal Separator Set the decimal separator to match the generated measurement reports to the PC settings. This simplifies data post-processing on the PC. • Navigate to the Dec. Separator function 8 with the rotary wheel . • Toggle between “ . ” and “ , ” with enter to set this parameter. Vibration This page is available upon switching to the vibration menu, which requires an installed Vibration-Option. Vibration is selected in the calibration menu.
System Settings Scheduler 1 2 3 4 5 The XL2 Analyzer offers automated scheduled measurements without any human interaction. You may schedule a measurement for one or multiple days or ever. XL2 Actions after pressing Start Schedule • Selects the preset measurement function.
System Settings 1 Function Select the measurement functions for the scheduled measurements. 2 Start Date and Time Set the date for the scheduled measurement(s): • Select Start with the rotary wheel . • Confirm with enter . • Set the date with the rotary wheel . • Confirm each setting with enter . Set the time for the scheduled measurement: • Select the T symbol to the right of the date. • Confirm with enter . • Set the time with the rotary wheel . • Confirm each setting with enter .
System Settings Scheduling - Getting Started Options After starting the scheduled measurement, the XL2 waits for the next scheduled start date and time. The instrument buttons are disabled. Power Supply It is recommended that the instrument remains powered on until the next start time, using the accessory mains power adapter. If the XL2 is powered off and on again during this time, then the XL2 Analyzer restarts in the Scheduler function and continues the countdown.
System Settings Information 1 2 1 Serial Number Displays the instrument’s serial number. 2 Firmware Displays of the firmware version number (to update the firmware to the latest version see the chapter Firmware Update of XL2.
Data Management 12. Data Management 1 Create New Project Folder Add a new folder with an individual project name. The maximum length of the project name is 16 characters. A fast way for creating new folder names is • Select an existing folder name with DIR • Select NEW • Rename the folder and confirm with start , thereby creating a new folder name. 2 Select Project Folder An overview of all existing project folders is shown. Select a folder to store the results of the measurements.
Data Management Assisted A pop up menu appears after each measurement. You may select to keep or delete the stored measurement records. 9 Free Memory Displays the remaining available memory on the SD Card. 5 Save Test Stores the measurement in the selected project folder. The XL2 prevents a memory overflow. SD Cards are not designed for a 100% memory usage; the XL2 keeps at least 2% or 50 MB empty. 6 Save Screenshot Stores the XL2 screen in the selected project folder.
Data Management 10 Write Cache (available with Extended Acoustic Pack) A low Write Cache level indicates that the SD Card is performing well. The optional Extended Acoustic Pack with simultaneous 100ms logging and linear wav-file recording results in high data volumes being written to the SD Card. Some non-original SD Cards may overload (OVLD), causing the loss of some measurement data. Verify the Write Cache of your SD Card during your measurements. Use only original SD Cards.
Data Management Measurement Data - Getting Started Enable Data Logging • Select the Log page in the sound level meter function and set the logging parameters; e.g., as follows: 192 The data logging is enabled. The sound pressure level will be logged each second while the measurement is running.
Data Management Complete the Measurement • Press page to return to the numeric result page. • Press start . The sound level measurement is now running. • Press stop to complete the sound level measurement. Manual Data Saving • In the case when the instrument is used with the setting Autosave: Off, a question mark appears after the completed measurement . • Now you may store the measurement data manually. • Select the memory menu with the rotary wheel and confirm with enter .
Data Management Select File Name • Name the first part of the file name. The maximum length of the first part is 12 characters. The next part “_SLM_001” is defined by the XL2 to avoid overwriting of existing measurements, whereby “SLM” is the appendix for the measurement function and “001” is an automatically-incrementing number. 194 Predefined Save Names Generate a text file with user defined save names, such as “Room1”, “Room2”, ..., and store it as “savenames.txt” in the root directory of the XL2.
Data Management Record Voice Notes With the internal voice note microphone, record a Voicenote to save with the test to remind yourself at a later stage where and/or under which conditions the measurement was done. • Select Record Voicenote and press enter . • Select SAVE and confirm with enter • Select REC and press enter . • Record the voice note and press enter The voice note has been recorded. Save Measurement Data to finish. .
Data Management Save Screenshot • Select the memory menu confirm with enter . with the rotary wheel The memory menu opens. • Select Save Screenshot and press enter . • Select the file name and confirm SAVE with enter 196 and The screenshot is saved to the SD Card. .
Data Management View Project Folder on the PC • Connect the XL2 with the USB cable to the PC. The PC recognizes the XL2 as a mass storage device. The following SD Card content is shown: The pop-up window USB Mode appears. • Open the folder “Projects” and the subfolder “MyProject”. • Select Mass Storage and confirm with enter . All stored measurement data files are shown.
Data Management Overview of Measurement Data Files 3 Measurement Report File Final report after the completed measurement. For more details please see the chapter Sound Level Meter: Reporting. 4 Wav-File The wav-file is the recorded audio file. The index “FS133.0dB(PK)” in file name represents the full scale peak level of the recorded wav-file. For more details please see the chapter Sound Level Meter: Wav-File Recording.
Data Management The log data file may become very big during long-term measurement applications. As soon the file size reaches 2 GB during the ongoing measurement, the file is saved with the index 1 and a new data file created with index 2. XL2 Data Explorer Software combines all these data files together seamlessly. Transfer Measurement Data to PC • Drag and drop the required data files to the PC. Card Reader Alternatively the SD Card can be inserted into a card reader.
Data Management Report File Format File name: e.g. MyTest_SLM_000_123_Report.txt Log File Format File name: e.g. MyTest_SLM_000_123_Log.txt ;/ %URDGEDQG /RJJLQJ 0\3URMHFWV?0\7HVWB6/0B B B/RJ W[W ;/ 6RXQG /HYHO 0HWHU %URDGEDQG 5HSRUWLQJ 0\3URMHFWV?0\7HVWB6/0B B B5HSRUW W[W +DUGZDUH &RQILJXUDWLRQ 'HYLFH ,QIR ;/ 61R $ $ ' ): 0LF 7\SH 17L $XGLR 0 6
Data Management XL2 File Validator A check sum is written to the file at the end of every measurement report. The XL2 Analyzer calculates the check sum automatically based on the data content of the file. Using the XL2 File Validator PC-software, the contents of a data file may be verified at any time. e.g. authorities can verify if the XL2 report file is original or the data has been manually modified.
Data Management Load Test • Select the memory menu confirm with enter . with the rotary wheel and Select File Name • Select Load Test and confirm with enter . The pop-up window Load Test appears. The memory menu opens. • Select the project folder and stored data file name with DIR. • Select LOAD, confirm with enter .
Data Management Append Measurements View Measurement Data The previously stored measurement data is displayed. The append mode stores the results of several individual measurements into the same data file, thus simplifying measurement result analysis and data handling on the PC.
Data Management Select Filename Start the Append Mode • Select SLMeter and preselect the sound level LAeq. • Select the memory menu with the rotary wheel confirm with enter . The memory menu opens. • Select Start Append Mode and confirm with enter and The Start Append Mode window opens. . • Name the first part of the file name. The maximum length of the first part is 12 characters.
Data Management Take Measurement Results • Measure the sound level LAeq on the first position. • Select the memory menu and Append Data. Store Measurement Results The pop-up window Append Data appears. • Select the location ID and measurement ID, thus each measurement result is stored with an individual description for later documentation. • Select Append with the rotary wheel and confirm with enter .
Data Management Append Further Measurement Results • Move to the next location in the room, carry out the measurement and follow the described append data procedure. Exit Append Mode • Open the memory menu . • Select Exit Append after adding the last measurement. Append After Power Up You can continue to add measurement results into the same data file at any time later. • Store the measurements in the append mode and switch the XL2 off and on again . The pop-up window Continue append appears.
Data Management Recall Previous Measurements for Append Any previously stored measurement with the remark for append can be recalled and further test records appended. • Select Load Test and press enter . • Select the project folder and stored data file name. • Select LOAD confirm with enter . The pop-up window Load for Append appears. • Select Continue and add further measurements to the same report file in the append mode.
XL2 Projector PRO 13. XL2 Projector PRO Software The Projector PRO displays the XL2 screen in real-time via USB on the connected Windows or Mac computer. The software toolbar enables control of the XL2 with the mouse and keyboard. The background color turns from green to red synchronized with the XL2 limit button color according to the user-defined limits. The “XL View” and the “Sound Level Predictor” display extend the XL2 Projector PRO for live sound monitoring applications.
XL2 Projector PRO The pop-up window USB Mode appears. • Select COM port on the XL2. • Microsoft Windows may recognize the new hardware automatically and start the hardware installation assistant. If prompted, select “No connection to Windows Update” and continue with the installation. • Complete the installation. XL2 Projector PRO displays the instrument screen in realtime. For more details and features see the XL2 Projector PRO user manual at ? in the menu.
XL2 Data Explorer 14. XL2 Data Explorer (optional) Data Explorer is a PC-based software application with a powerful data processor for easy and fast analysis of sound level measurement data. It is dedicated to acoustic consultants and noise measurement professionals. XL2 Data Explorer provides a convenient way to view, analyze and manage data and quickly create customized reports.
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Building Acoustics 15. Building Acoustics (optional) The Sound Insulation Reporter software is a PC-based software application that provides all the standard reports for Airborne and Impact sound insulation measurements. Designed for acoustic consultants, this comprehensive tool uses data gathered by the XL2 Sound Level Meter, and quickly returns graphical analysis of all measurement positions.
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Room Acoustics 16. Room Acoustics (optional) The Room Acoustics Reporter is a PC software for automatically generating reverberation time measurement reports and analyzing the RTA frequency response spectrum. The software supports acousticians and experts in the visualization and detailed evaluation of measurement data recorded with the XL2 Sound Level Meter.
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Sound Power 17. Sound Power (optional) Sound Power Reporter is a PC-based software application that provides all the standard reports for sound power measurements in accordance with ISO 3744 and ANSI-ASA S12.54. Designed for industrial professionals, this comprehensive tool uses data gathered by the XL2 Sound Level Meter, and quickly returns graphical analysis of all measurement positions.
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NoiseScout 18. Unattended Noise Monitoring NoiseScout provides a comprehensive but easy-to-use 24/7 noise monitoring solution. Noise levels are recorded on-site by the XL2 Sound Level Meter and are available for remote monitoring and download. NoiseScout is aimed at both short term noise assessments and long term monitoring applications. It offers the freedom to start and stop the remote noise monitoring from your office or mobile device providing total flexibility in meeting your project requirements.
NoiseScout Noise Monitoring in “Gateway Mode” Direct access to the XL2 Sound Level Meter is available from around the world. An internet connection allows SFTP (Secure File Transfer Protocol) and remote access to the XL2. All data files can then be retrieved from the remote XL2 Sound Level Meter even during an ongoing measurement. Also, the spectral data and audio files can be directly downloaded from the remote XL2. The remote access allows full control of the XL2 Sound Level Meter.
NoiseScout How to connect? 1 Network Status Indication It replaces the speaker symbol in the top menu. The NetBox can be connected to the internet via LAN/Ethernet or Mobile Data (i.e. cellular network as e.g. GSM, UMTS, 3G). The LAN connection from the NetBox to the network is established automatically. Setup is required for the mobile connection.
NoiseScout • Select Mobile Data and confirm with enter ; the minimum requirement is entering the APN of your provider. • Confirm Close. • Set the connection parameters and select Exit. The XL2 is connected to the network.
Time Synchronization 19. Time Synchronization The XL2 Analyzer may synchronize the start time precisely with the GPS signal. The measurement start matches the GPS time with an accuracy of +/- 0.7 ms (+/- 32 samples @ 48 kHz). This requires • a txt-file named “gpssync.txt” stored on the SD card • a specially adapted GPS Receiver, NTi Audio # 600 000 357 Concept The measurement start follows these concept: • Relative Time The GPS Receiver generates a square signal with a frequency of 0.1 Hz.
Time Synchronization XL2 User Interface The clock delimiter signals the state of GPS time detection. GPS time signal is synchronized with GPS (locked). GPS receiver connected, but time signal not synced with GPS (unlock). GPS time signal not found, receiver is not connected or XL2 not configured for GPS. When starting a GPS time-synchronous measurement you observe the following characteristics: After starting the measurement, the start counter in the button will remain at 1 for up to 10 seconds.
Time Synchronization Minutes of deviation The deviation of the time currently used for the measurement from the GPS time is recorded by the XL2 in the log file (123_Log.txt). Add_To_Time [ms] GPS Status [] 0.0 2.0 Example The PPS signal is recorded with the XL2. For this, the input of the XL2 from XLR to RCA can be set. The positive edge of the recording should always be exactly to multiples of 10 seconds, but in this case at 00: 35: 00,005: Meaning of the column “GPS Status”: 0.
Time Synchronization Connection Diagram GPS Receiver connects to XL2-TA Adapter Cable MD6/RCA Adapter Cable MD6/USB connects to NetBox - USB 1 225
Remote Measurement 20. Remote Measurement The Remote Measurement option allows the real-time acquisition of XL2 measurement data directly into a computer application via USB. The option adds a real-time acquisition facility to the Sound Insulation Reporter software. Alternatively you can write your own unique measurement applications for sound level monitoring or automated measurements, e.g. with MS Excel or LabView. A documented command set for data retrieval via USB is available.
Remote Measurement Auto Start The XL2 with serial number ending “E0” or higher may power on automatically upon after a power loss (e.g. mains power disconnected or battery pack empty) the power is available again. Best the instrument is operated by mains power without the internal battery pack installed. This auto start functionality is enabled by copying a txt-file with the file name “AutoOn.txt” onto the SD Card.
Microphones 21.
Microphones M2230 M2230-WP Outdoor Microphone M2211 M2215 M4261 MA220 PreAmplifier consists of MA220 PreAmplifier and MC230 or MC230A capsule consists of M2230 Microphone and WP30 Weather Protection consists of MA220 PreAmplifier and M2211 capsule consists of MA220 PreAmplifier and M2215 capsule with permanentlyinstalled capsule - Screen connection used for ASD technology 2 2 3 3 1 1 XLR M Pin 2 + Pin 3 Pin 1 Shield Microphone 2 3 1 ASD Microphone Capsule Connection diagram of measur
Microphones Microphone plugs directly into the XL2 The XL2 automatically reads the electronic data sheet of the connected microphone as follows: • Connect the measurement microphone to the XL2. • Switch on the XL2. Microphone Connection via a professional Audio Cable For distances longer than 20 meter (= 65 feet) use a highquality, low-capacitance standard professional audio cable. The microphone sensitivity has to be entered manually into the XL2 Analyzer.
Microphones Outdoor Microphone M2230-WP The M2230-WP is a weather-protected microphone solution for the XL2 Sound Level Meter allowing acquisition of environmental noise data in outdoor applications.The corrosion-free polymer housing, wind screen, water-repellent membrane and bird spike provide excellent protection from rain, wind, dust and perching birds. The frequency response of the M2230-WP fulfills the class 1 requirements of IEC 61672 and ANSI S1.4 for vertical sound incidence.
Further Information 22. Further Information My NTi Audio Register your instruments at My NTi Audio and benefit from the following possibilities: • • • • • • • Free updates for your instruments Activation of optional product functions Premium access to downloads Receive application and product news Faster worldwide support Tracing support in case of loss or theft Calibration support 232 How to Register • Open the web page “https://my.nti-audio.com”.
Further Information Tips and Troubleshooting Overview • Resetting to Factory Default • XL2 Starts Up with Limited Functions • Can I use another SD Card? • Formatting the SD Card • SD Card Errors • Error messages on display • Stored Data or Wav-files not available on SD Card Resetting to Factory Default If the XL2 Audio and Acoustic Analyzer reacts unexpectedly, a reset to the factory settings might solve the problem. • Switch off the XL2 • Hold down escape .
Further Information SD Card Errors The XL2 Audio and Acoustic Analyzer writes measurement data automatically onto the SD Card during ongoing measurements, thus a functioning SD Card has to be inserted at all times. Error Messages Missing SD-Card Actions to do Insert the SD Card. SD-Card is not FAT Format the SD Card on the PC. Follow formatted the instructions at Formatting the SC Card in this chapter. SD-Card is full The memory of the SD Card is full. Download all data to the PC and empty the SD Card.
Further Information Firmware Update You will find information about the installed firmware version in the systems settings of the instrument. The firmware revision history is listed on the XL2 Support Page https://my.nti-audio.com. Updating the firmware on the XL2 is executed by placing the XL2Vxxx.xx file in the root directory of the XL2. When started, the XL2 automatically completes the firmware update. 1 1 XL2.
Further Information Options The System menu shows the installed options on the XL2. The following options extend the measurement functions of the XL2: Extended Acoustic Pack NTi Audio #: 600 000 339 • FFT function -- High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.
Further Information Speech Intelligibility STIPA NTi Audio #: 600 000 338 Remote Measurement Option NTi Audio #: 600 000 375 The XL2 Analyzer measures the speech intelligibility according to the latest revision of standard IEC 60268-16:2011 (edition 4) and older editions. It includes ambient noise correction and automated averaging of measurements. The XL2 displays the measurement results as STI or as CIS results, accompanied by the individual levels and modulation indices of the seven octave bands.
Further Information Spectral Limits Option NTi Audio #: 600 000 376 The Spectral Limits Option extends the XL2 function range in both, the sound and vibration mode. It adds noise curves, trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and high resolution spectral analysis up to 1/12th octave. The vibration mode is enabled upon installing the vibration option.
Further Information Type Approval Option NTi Audio #: 600 000 377 XL2 Vibration Option NTi Audio #: 600 000 436 The Type Approval Option upgrades the instrument to the XL2-TA, the sound level meter dedicated to certified measurements. The XL2-TA with the M2230 microphone forms a type approved sound level meter offering class 1 performance in accordance with IEC61672, IEC61260 and ANSI S1.4. The Type Approval Option includes • XL2-TA Firmware V4.
Further Information Cinema Meter Option NTi Audio #: 600 000 379 The Cinema Meter Option forms the dedicated solution for efficient calibration and repetitive verification of cinema loudspeaker systems according to the SMPTE ST 202:2010, SMPTE RP 200:2012 and ISO 2969:2015 standards. An interactive assistant guides the user through dedicated measurement procedures. • Create new cinema Generates measurement templates according the cinema size with dedicated X-curve selection.
Further Information XL2 Data Explorer Option NTi Audio #: 600 000 430 XL2 Sound Insulation Option NTi Audio #: 600 000 432 The Data Explorer Option enables the import of logged sound level data into the XL2 Data Explorer software, a PC-based software application with a powerful data processor for easy and fast analysis of noise monitoring data. The Sound Insulation Option enables the import of measurement data into the Sound Insulation Reporter software.
Further Information XL2 Room Acoustics Option NTi Audio #: 600 000 440 XL2 Sound Power Option NTi Audio #: 600 000 434 The Room Acoustics Option enables the import of measurement data into the Room Acoustics Reporter software. The Sound Power Option enables the import of measurement data into the Sound Power Reporter software. The Room Acoustics Reporter is a PC software for automatically generating reverberation time measurement reports and analyzing the RTA frequency response spectrum.
Further Information Installation of Options 1. 3. 2. PC Power On XL2 Mass storage 6. 5. 4. 1. Open XL2-TA.htm Activate option Login (https://my.nti-audio.
Further Information 8. 7. Insert License number Get Activation Key 9. 10. Download activation file and copy to XL2 (xx_0xxxx.
Further Information Accessories Calibration Certificate Manufacturer Calibration Certificate The calibration certificate lists the individual product data with serial number. The calibration and adjustment procedures follow the documentation and traceability requirements of the EN ISO / IEC 17025 standard. Annual re-calibration of the instrument is recommended ensuring accurate measurements. NTi Audio # 600 000 018 Ever-ready Pouch The Ever-ready Pouch protects the XL2 during transport and operation.
Further Information XLR Adapter ASD XLR male/female Adapter with electronic data sheet for automated sensor detection (ASD) of other sensors. XL2 Mounting Adapter This mechanical adapter piece mounts the XL2 on a microphone stand. Adapters for 3/8” or 5/8” stands are included. NTi Audio #: 600 000 372 NTi Audio #: 600 000 383 Ball Head Mount This flexible universal joint mounts the XL2 on a 1/4” or 3/8” stand. It provides the facility to mount the XL2 at any angle.
Further Information XL2 Input Keypad The XL2 Input Keypad offers four marker keys to trigger an event recording or categorize any noise during measurements. Requires the optional Extended Acoustic Pack. NTi Audio #: 600 000 384 ASD Cable The ASD Cable allows for extended connections of the NTi Audio measurement microphones. It supports the transfer of the electronic data sheet from the microphone to the XL2 Analyzer.
Further Information NetBox The NetBox connects the XL2 Sound Level Meter to the internet for unattended noise monitoring. It transfers the measurement data to the fully-managed NoiseScout Web Portal in real time or provides a secure internet FTP access to the instrument. The supported communication interfaces are 3G and LAN.
Further Information Limit Light The XL2 Audio and Acoustic Analyzer in combination with this Limit Light offers a turnkey solution for live sound monitoring. The sound level limits are set in the XL2. The Limit Light provides a pre-warning with an orange light and indicates that levels have been exceeded with a red light.
Further Information Weatherproof Enclosure for Noise Monitoring Terminal The weatherproof enclosure is the tailored fixed installation solution for unattended noise monitoring. The enclosure is IP66 rated, highly secure and constructed of strong, hard-wearing reinforced fiberglass. NTi Audio #: 600 000 480 Shroud MXA01 The Shroud reduces the acoustic reflections from the XL2 housing back to the microphone capsule for precision class 1 measurements.
Further Information GPS Receiver (customized) The specially adapted GNSS receiver comes with a built-in active antenna in a white housing. It connects to the XL2 Sound Level Meter and the NetBox. Typical applications are to synchronize the start time of one or multiple XL2s precisely with the GPS signal (+/- 0.7 ms) or presenting the precise instrument position in NoiseScout Gateway mode for unattended noise and vibration monitoring. The GNSS receiver supports Galileo, GPS and other systems.
Further Information Sound Power Reporter Software Sound Power Reporter is a PC-based software application that provides all the standard reports for sound power measurements. The Sound Power Option enables the import of measurement data into the Sound Power Reporter software. Download the software at https://my.ntiaudio.com. 89.4 dBA 85.3 dBLeq XL2 Projector PRO Software The Projector PRO software displays the XL2 screen in real-time on your PC when connected by USB.
Further Information SD Card 32 GB Every 32 GB SD Card is individually tested. The XL2 requires an SD card that can continuously and simultaneously store many data streams. Unfortunately many cards available on the market are known to interrupt the read/write process for periods of more than 10 seconds. This leads to data loss in the XL2. These interruptions can occur regardless of the speed rating of the card.
Further Information NTi Audio TalkBox The NTi Audio TalkBox greatly simplifies the acoustic feed of the STIPA intelligibility test source signal into closed sound reinforcement systems. It presents the standardized voice-like acoustic signal emission simulating a human talker in accordance with IEC 60268-16, combined with a certified speech intelligibility signal at standardized levels.
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Further Information Warranty Conditions Service and Repairs International warranty NTi Audio guarantees the function of its products and the individual components for a period of one year from the date of sale. During this period, defective products will either be repaired free of charge or replaced. If your product is not functioning correctly or is damaged, please contact the local NTi Audio partner for assistance.
Further Information Calibration Certificate Your NTi Audio instrument has been tested during manufacture and conforms to the specifications listed in “Technical Data”. The XL2 combination with the appropriate measurement microphone forms a precise class 1 or class 2 sound level meter in accordance with the standards and configurations listed in “Technical Data”.
Further Information Sample Calibration Certificate Calibration of: Serial Number: Date: XL2 Audio and Acoustic Analyzer A2A-11667-E0 25 July 2016 • Measurement Data on Receipt: in tolerance • Detailed Calibration Test Results: reference 0.1 1 10 RMS Level @ 1kHz, XLR Input Manufacturer Calibration Certificate Flatness, XLR Input1 The following instrument has been tested and calibrated to the manufacturer specifications.
Further Information Declaration of Conformity Information for Disposal and Recycling CE / FCC Compliance Statement We, the manufacturer NTi Audio AG, Im alten Riet 102, 9494 Schaan, Liechtenstein, do hereby declare that the XL2 Analyzer, the measurement microphones M2230, M2211, M2215, M4261, the preamplifier MA220 and accessories, comply with the following standards or other standard documents: • EMC: 2014/30/EU • Harmonized standards: EN 61326-1 • Explosive atmospheres (ATEX): 2014/34/EU • Directive 20
Specifications 23. Technical Data XL2 All specifications are according to the IEC61672 standard. Other standards are listed the corresponding specifications.
Specifications Audio Recording ••Default »»Recording of compressed wav-files (ADPCM - 4 bit, 24 kHz) »»a new wav-file starts every 12 hours (max. wav-file size 512 MB) »»Bandwidth: 2.0 Hz - 10.2 kHz ••Optional: Extended Acoustic Pack »»Recording of linear wav-files (24 bit, 48 kHz) »»a new wav-file starts every 1 hours (max. wav-file size 512 MB) »»Bandwidth: 2.0 Hz - 23.6 kHz ••Optional: NoiseScout - Managed Mode »»Recording of compressed wav-files (4 bit, 12 kHz) »»Bandwidth: 2.0 Hz - 5.
Specifications Residual noise in [dB] @S= 42 mV/Pa of XL2 without measurement microphone ••Frequency weighting A Level range LOW Leq 4 Lpeak 17 MID 18 31 HIGH 43 55 ••SPL actual, Lmin, Lmax, Lpeak, Leq ••Gliding LAeq and LCeq with selectable time window from one second to one hour (=running Lxeq or sliding Lxeq with x= A or C) ••All measurement results simultaneously available ••Correction value measurement wizard based on LAeq, LCeq and LCpeak ••Noise exposure level LEX with post-processing ••Lo
Specifications Remote Measurement (optional) Querying measurement data online via the USB interface of the following functions: ••Sound level meter and spectrum analyzer SLMeter/RTA ••FFT analyzer ••RT60 reverberation time ••Audio analyzer RMS/THD+N ••High resolution spectral analyzer 1/12 Oct + Tol Data Explorer (optional) ••Enables the import of measurement data into the XL2 Data Explorer software ••Powerful data processor for easy and fast analysis of sound level measurement data on PC Sound Insulat
Specifications Functions of Spectral Limits Option (optional) 264 ••SLMeter/RTA function »»True peak level in 1/1 and 1/3 octave resolution ••FFT function »»High-resolution Zoom-FFT with selectable frequency ranges and resolution up to 0.4 Hz »»Sound mode: 5 Hz to 20 kHz »»Vibration mode: 1 Hz to 20 kHz ••1/12 octave function »»High resolution RTA function “1/12 Oct + Tol” »»Selectable 1/1, 1/3, 1/6 and 1/12 octave spectral resolution »»Frequency band listening at rear speaker »»Sound Mode: 11.
Specifications Polarity ••Checks polarity of speakers and line signals ••Positive/Negative detection of wideband and individual 1/1 octave bands through internal microphone or XLR/RCA connector ••Test signal: NTi Audio polarity test signal generated by the MR-PRO, MR2 or the included NTi Audio Test CD Delay Time ••Propagation delay between electrical reference signal and acoustic signal using the internal microphone ••Range: 0 ms - 1 second (0 m - 344 m) ••Resolution: 0.
Specifications Audio Analyzer Conforms with Standards ••IEC 61672, IEC 60651, IEC 60804 ••DIN EN 60065, VDE 0860, IEC 468-4 Level RMS ••True RMS detection in V, dBu, dBV, dBSPL ••Power measurement in Watt W or dBm with flexible load setting from 1.0 to 9999 Ohm ••Range XLR/RCA input: 2 µV - 25 V (-112 dBu to +30 dBu) ••Accuracy: ± 0.5 % @ 1 kHz, ••Flatness: ± 0.1 dB @ 12 Hz to 21.3 kHz ••Bandwidth (-3 dB): 5 Hz to 23.
Specifications Vibration Meter Channels ••1 (Single-channel) Parameters ••Real time measurement in »»Acceleration: m/s2, g, in/s2, dB »»Velocity: m/s, in/s, dB »»Displacement: m, in, dB »»Peak particle velocity PPV: mm/s, in/s VibMeter ••Broadband level »» Frequency range: 0.8 Hz - 2.5 kHz ••Spectral »»1/1 octave band display: 1 Hz - 2.0 kHz sub ranges 1 Hz - 500 Hz or 4 Hz - 2 kHz »»1/3 octave band display: 0.8 Hz - 2.5 kHz sub ranges 0.8 Hz - 1.0 kHz, 2.5 Hz - 2.
Specifications Referencemeasurement range 268 ••Mid Input / Output Interfaces Audio Inputs ••XLR balanced »»Input impedance = 200 kOhm »»Phantom power: +48 VDC switchable with maximum 10 mA supply current in accordance with IEC 61938 »»Automated sensor detection for NTi Audio’s ASD measurement microphones and pre-amplifier MA220 ••RCA unbalanced with input impedance >30 kOhm ••Built-in condenser microphone for polarity testing, delay measurements and voice note recording Audio Outputs ••Built-in spea
Specifications Memory Power Supply ••External battery pack »»22 Ah battery pack: 4 days »»44 Ah battery pack: 8 days SD Card included (8 GByte), removable, storing measurement data in ASCII format, screen shots, voice notes and wav-files Power Supply Data logging every second offers following noise monitoring periods: ••Logging default noise levels: > 2 years ••Additional logging of 1/3 octave data: > 6 month ••Additional »»compressed audio recording: > 1 week »»linear audio recording: > 15 hours Gen
Specifications 24. Technical Data Microphones M2230 Classification with XL2 according to IEC 61672, ANSI S1.
Specifications M2230 Sensitivity typical @ 1 kHz M2230-WP Outdoor Microphone (M2230+WP30) -27.5 dBV/Pa ±2 dB (42 mV/Pa) Temperature Coefficient M2211 M2215 High SPL M4261 -34 dBV/Pa ±3 dB (20 mV/Pa) -42 dBV/Pa ±3 dB (8 mV/Pa) -36 dBV/Pa ±3 dB (16 mV/Pa) < -0.01 dB / °C Temperature Range < ±0.015 dB / °C < ±0.02 dB / °C -10°C to +50°C (14°F to 122°F) Pressure Coefficient -0.005 dB / kPa Influence of Humidity (non-condensing) 0°C to +40°C (32°F to 104°F) -0.02 dB / kPa -0.
Specifications Typical Frequency Response of Measurement Microphones M4261 M2230, M2211, M2215 8 Tolerance Class 1, IEC61672-1 6 Sensitivity relative [dB] 4 2 0 -2 -4 Tolerance Class 2, IEC61672-1 -6 -8 5 10 10 20 100 100 log frequency [Hz] 1000 1000 (free field conditions @ reference direction 0°) 272 10000 10000 20000
Specifications Linear Measurement Range acc. IEC61672 / ANSI S1.4 (typ.
Specifications Free Field - Pressure Correction Factors If a measurement microphone is held in a free-field environment, then the measurement microphone acts at high frequencies like a reflector. The sound pressure increases in front of the microphone capsule membrane. M2230, M2211 and M2215 are free-field equalized measurement microphones, they compensate for the increased pressure internally. The calibrator no longer offers free-field conditions.
Specifications Actuator Correction The following freefield 0° incidence corrections apply for calibration using an actuator: Nominal Frequency [Hz] 1/2” Microphone M2230 (protection grid actuator) [dB] <400 0.0 400 500 630 -0.2 0.0 -0.2 800 1000 1250 0.0 0.0 -0.1 1600 2000 2500 0.2 0.2 0.3 3150 4000 5000 0.8 1.0 1.6 6300 8000 10000 2.4 3.6 4.8 12500 16000 20000 6.5 9.3 11.
Specifications 276
Specifications Diffuse Field Correction Factors A diffuse sound field is characterized by the sound arriving at the receiver from all directions with more or less equal probability. The M2230, M2211, M2215 and M4261 are free-field equalized measurement microphones. The default frequency response refers to a 0° sound incidence. The diffuse-field frequency response is calculated by averaging the directional characteristics; this results in a reduction at the high frequencies.
Specifications M2230 Frequency Response for Free Field, Diffuse Field and Pressure Idealized Free Field 1 0 sensitivity relative [dB] Ͳ1 -1 Ͳ2 -2 Ͳ3 -3 Ͳ4 -4 Ͳ5 -5 Diffuse Field Ͳ6 -6 Ͳ7 -7 Ͳ8 -8 Pressure Ͳ9 -9 Ͳ10 -10 10 10 20 100 100 log frequency [Hz] 278 1000 1000 10000 10000 20000
Specifications Spectral Correction for horizontal Sound Incidents using the Outdoor Microphone The outdoor microphone M2230-WP fulfills Class 1 requirements of IEC 61672 and ANSI S1.4 for vertical sound incidence. For compliance with horizontal sound incidence a spectral correction is employed in the associated XL2 Sound Level Meter. Nominal Frequency [Hz] Spectral Correction for horizontal Sound Incidents with Firmware V4.20 or higher [dB] 1/3 Octave 1/1 Octave <800 0.0 0.0 800 1000 1250 0.0 0.
Specifications 25. Technical Data PreAmplifier MA220 PreAmplifier Microphone PreAmplifier Compatible with 1/2” microphone capsules type WS2F in accordance with IEC61094-4 Frequency Range 4 Hz - 100 kHz Residual Noise Floor typical Frequency Response Flatness 1.6 mV(A) at C_in 18pF ≙ 12 dBA @ 20 mV/Pa Phase Linearity < 1° @ 20 Hz - 20 kHz Maximum Output Voltage Electronic Data Sheet 21 Vpp ≙ 7.4 Vrms ≙ 145 dBSPL @ 20 mV/Pa, THD 3%, 1 kHz Impedance Input: 20 GOhm // 0.
Appendix Appendix Appendix 1: Standard - Optional Features Standard Features Optional Sound Level Meter Frequency Weighting - Sound Level Meter Time weighting • Extended Acoustic Pack: Impulse Sound Exposure Level Percentile Sound Pressure Levels for wide band, 1/1 and 1/3 octave spectrum with flexible setting from 0.1% to 99.9%.
Appendix Standard Features Optional • Extended Acoustic Pack: Clock-Impulse Maximum Level (Taktmaximalpegel) in accordance with DIN 45645-1: Sound Level Meter Parameter Calculated levels in accordance with DIN 45645-1: Impulsiveness in accordance with BS4142:2014 and NordTest ACOU 112 Sound Level Meter RTA Spectrum Analyzer supported • Extended Acoustic Pack or Spectral Limits Option: True peak level 282
Appendix Standard Features Sound Level Meter Audio Recording • Recording of wav-files (ADPCM compression) • Voice note recording Sound Level Meter Triggered Event Recording - Sound Level Meter Logging supported Optional • Extended Acoustic Pack: Recording of wav-files (24 bit, 48 kHz) • Extended Acoustic Pack: • 100 ms logging • RTA logging of Lmin and Lmax • Extended Acoustic Pack or Spectral Limits Option: FFT Analysis Measurement Range with zoom function FFT + Tol Capture and Tolerance - • Sp
Appendix Standard Features Optional Noise Curves - • Spectral Limits Option STIPA - • STIPA Option with STIPA functionality Cinema Meter - • Cinema Meter Option Querying measurement data online via the USB interface - Remote Measurement Option supporting • Sound level meter and spectrum analyzer SLMeter/RTA • FFT analyzer • RT60 reverberation time • Audio analyzer RMS/THD+N • High resolution spectral analyzer 1/12 Oct + Tol 284
Appendix Appendix 2: Factory Default Profiles You may start up the XL2 with individual preset application profiles. The profile Full mode is the default configuration with all available measurement functions enabled.
Appendix DIN15905-5 / DIN15905-5 & Audio (Sound Level Monitoring in accordance with DIN15905-5) The following limits apply at all areas accessible by the visitors during the measurement period of 30 minutes: • Maximum averaged level = 99 dB The XL2 displays this maximum level with the measurement result LAeq+k1.
Appendix How to Measure • Select the page KSET with the rotary wheel . • Measure the correction values k1 and k2 as described in the chapter Sound Level Meter: Correction Value KSET. • Press the start button . • The icon LOG flashes during the ongoing measurement. In the case where the profile #DIN15905-5 & Audio has been selected the icon AUD flashes, indicating the additional audio wav-file logging.
Appendix V-NISSG 100dB / V-NISSG 100dB&Audio (Sound Level Monitoring in accordance with V-NISSG) The following limits apply at all areas accessible by the visitors during the moving measurement period window of 60 minutes during the live event: • Maximum averaged level The XL2 displays this maximum level with the measurement result LAeq60‘+k1. Type of live event Max.
Appendix The following sound levels are displayed in the real-time analyzer page: LZFhold3 For tracing of feedback frequencies. The peak hold time is set to 3 seconds. LZFlive Actual real-time spectra. In accordance with V-NISSG, all sound levels are measured, displayed and logged to SD Card automatically. The settings are locked, which ensures that the correct parameters are measured. The profile #V-NISSG 100dB&Audio includes the recording of Compressed+AGC wav-files.
Appendix Limits This profile is configured with the following limits, which trigger the lights on the limit button and external Digital I/O Adapter. This facilitates a quick response to sound levels that exceed these limits. Appendix 3: Description Sound Levels A-Frequency Weighting Filter in accordance with IEC 61672 Applicable for most common sound pressure level measurements, compensating for human hearing perception at lower sound pressure levels.
Appendix Sound Exposure Level The sound exposure level LAE characterizes the totalenergy content of a signal and corresponds to the LAeq normalized to one second. The sound exposure level is measured for example to compare noise events with different time durations. The LAE reports the amount of noise from an event such as an individual aircraft fly-over. An earlier used level name is SEL.
Appendix Application example: • Display the moving Leq over 5 seconds in accordance with DIN15905 • Measure the moving Leq over 60 minutes in accordance with V-NISSG Fast Time Weighting Time constant t = 125 ms; the time weighting is an exponential function of time, which defines how changes of the instantaneous sound pressure level are averaged for useful sound pressure level results. The measurement results are shown accurately for sound sources with a minimum length of 0.5 seconds. The decay rate is 34.
Appendix Correction Value k1 The correction value k1 is based on an LAeq measurement. It is measured or manually set in the page KSET of the sound level meter function. Correction Value k2 The correction value k2 is based on either LCeq or LCpeak measurement. It is measured or manually set in the page KSET of the sound level meter function. Parameter live Actual current sound pressure level. Parameter max Maximum sound level of the measurement cycle.
Appendix Slow Time Weighting Time constant t = 1 second; the time-weighting is an exponential function of time, which defines how changes of the instantaneous sound pressure level are averaged for useful sound level results. The decay rate is 4.3 dB/s. Parameter T3 Clock-Impulse Maximum Level (Taktmaximalpegel) LAFT3 in accordance with DIN 45645-1. Maximum sound pressure level measured with frequency weighting A and time weighting F within a time interval of 3 seconds.
Appendix Appendix 4: Common Sound Levels Display Application LAE Sound Exposure Level The sound exposure level LAE characterizes the totalenergy content of a signal and corresponds to the LAeq normalized to one second. The sound exposure level is measured for example to compare noise events with different time durations. The LAE reports the amount of noise from an event such as an individual aircraft fly-over. An earlier used level name is SEL.
Appendix LAeq + k1 Time-Average Sound Level with Correction Value The actual measurement position often differs to the loudest position of the live event. Thus the correction value k1 is the correction value of LAeq between the loudest position and the actual measurement position, measured using pink noise. The correction value k1 is measured or manually set in the page KSET of the sound level meter function.
Appendix LAeq60’ +k1 Moving Time-Average Sound Level with Correction Value k1 The actual measurement position often differs to the loudest position of the live event. Thus the correction value k1 is the correction value of LAeq60’M between the loudest position and the actual measurement position, measured using pink noise. The correction value k1 is measured or manually set in the page KSET of the sound level meter function.
Appendix LAFmin dt Minimum Sound Pressure Level “delta t” in report Minimum level of the preset logging interval in the LOG-menu, e.g. 1 second. LAFxx% Percentile Sound Level The statistical distribution of sound pressure levels is commonly used for environmental noise analysis, such as road traffic or community noise assessments. For example LAFxx% is the noise level exceeded during xx% of the measurement period; e.g., LAF90% is the noise level exceeded during 90% of the measurement period.
Appendix LCeq Time-Average Sound Level or Equivalent Continuous Sound Level Averaged sound level over time with C frequency weighting. LCpeak Peak Sound Pressure Level Sound pressure level with C frequency weighting and peak time weighting. Measures the peak level. High peak levels can damage the human hearing. LCpeak max Maximum Peak Sound Pressure Level Maximum sound pressure level with C frequency weighting and peak time weighting. Measures the peak level.
Appendix LEX Noise Exposure Level LEX The Noise at Work Directive 2003/10/EC lays down minimum requirements for the protection of workers from risks to their health and safety arising or likely to arise from exposure to noise and in particular the risk to hearing.
Appendix Appendix 5: Vibration Meter Functions Acceleration a in units m/s2, g, in/s2, dB Clock-Impulse Maximum Level (Taktmaximalpegel) Maximum velocity during a periodic 30 seconds interval with time weighting F in accordance with DIN 4150-2.
Appendix Details IEC 61672 & IEC 61260 The XL2-TA Analyzer, with the M2230 measurement microphone, fully complies with the standards IEC 61672:2013, IEC 61672:2003, IEC 61260:2014 and IEC 61260:2003 as an integrating class 1 Sound Level Meter with A, C, Z frequency weighting and fast/slow time weighting. The impulse time weighting is optionally available with the Extended Acoustic Package.
Appendix Configuration “Microphone Attached” • XL2-TA Sound Level Meter -- Hardware version: D2 and E0 -- Firmware version 4.
Appendix General Information Reference Sound Pressure Level The reference sound pressure level is 114 dBSPL relative to 20 mPa. Reference Level Range The reference level range is MID, 20 - 120 dBSPL Reference Orientation The microphone reference point is located in the middle of the microphone membrane. The 0° reference orientation and the orientation of the membrane’s surface normal is identical.
Appendix Output (Refer IEC61672-1 paragraphs 5.16.1, 9.2.5p) The instrument provides no electrical analog or digital outputs for measurements. Typical Time Interval Needed to Stabilize after Changes in Environmental Conditions (IEC61672-1, 6.1.2, 9.
Appendix Impact of Electromagnetic Fields If the device is exposed to electromagnetic fields of 10 V/m, the measurement of sound levels below 74 dB is not specified. If the electromagnetic fields exceed 10 V/m, the exposed instrument is not specified in any level range. Susceptibility to AC Power and Radio Frequency Fields (Refer IEC61672-1 paragraphs 6.6.3, 9.
Appendix Class 1 Sound Calibrator (Refer IEC61672-1 paragraphs 5.2.1, 5.2.7, 9.3d) If an obligatory calibration is required for the sound level meter, in accordance with the type approval, then the Class 1 Sound Calibrator CAL200 should be used. Technical Details • Type: Larson Davis CAL200 • Level correction: -0.
Appendix Level Linearity (Refer IEC61672-1 paragraphs 5.5.3, 5.5.9, 9.2.2e, 9.3e, 9.3f). All values refer to Sref = 42 mV/Pa*.
Appendix Level range: High LAt* [dB] LCt* Frequency LAeqT* LZt* LAE* LCpeak* (tint = 10s) 53 from 51 from 56 from 53 from 63 31,5 from to 98 to 134 to 137 to 98 to 108 Hz starting 114 starting 114 starting 114 starting 114 starting 124 from 53 from 51 from 56 from 53 from 63 from 137 to 137 to 137 to 137 to 147 to starting 114 starting 114 starting 114 starting 114 starting 124 1 kHz to Sound pressure levels, which continiously exceed the specified linear measurement range and overload the micr
Appendix Level Linearity of Octaveband-Spectrum in accordance with IEC 61260. All values refer to Sref = 42 mV/Pa*. Nominal Frequency Hz Level Range LOW MID HIGH 20 24-106 dB 24-125 dB 40-134 dB 31.
Appendix Level Linearity of Third-Octaveband-Spectrum in accordance with IEC 61260. All values refer to Sref = 42 mV/Pa*. Nominal Frequency Hz Level Range LOW MID HIGH 20 24-106 dB 24-125 dB 40-134 dB 25 31.
Appendix Self-generated Noise with Microphone (Refer IEC61672-1 paragraphs 5.6.1 to 5.6.4, 9.2.5o) Self-generated noise with electrical input device @ S = 42 mV/Pa Level range [dB] Frequencyweighting low mid high Z 22 23 46 A 11 19 43 C 14 18 42 Self-generated noise with M2230 microphone @ S = 42 mV/Pa Level range [dB] Frequencyweighting low mid high Z 23 25 46 A 17 21 43 C 20 22 42 The averaging time is 30 seconds for all measurements.
Appendix 313
Appendix Frequency Response Corrections at 250 - 20000 Hz (Refer IEC61672-1 paragraphs 5.2.4, 5.2.5, 5.2.6 und 9.2.4d) Corrections below 250 Hz are 0.0 dB. No corrections apply for the typical effects of reflections from the case of the sound level meter and diffraction of sound around the microphone. The listed uncertainty applies for all here listed measurements and corrections. Its calculated for a level of confidence of 95% with a coverage factor k=2.
Appendix Nominal Frequency Actual Frequency 0° Free-field Frequency Response 0° Free-field Correction Impact of 50 mm Wind Screen 0° Free-field Correction with Wind Screen Impact of 90 mm Wind Screen Measurement Uncertainty 1500 1496.24 0.1 -0.1 0.1 -0.2 0,3 0.20 1600 1584.89 0.0 0.0 0.1 -0.2 0,3 0.20 1700 1678.80 0.0 0.0 0.1 -0.1 0,3 0.20 1800 1778.28 -0.1 0.1 0.1 -0.1 0,3 0.20 1900 1883.65 -0.1 0.1 0.2 -0.1 0,3 0.20 2000 1995.26 -0.2 0.2 0.2 0.
Appendix Nominal Frequency Actual Frequency 0° Free-field Frequency Response 0° Free-field Correction Impact of 50 mm Wind Screen 0° Free-field Correction with Wind Screen Impact of 90 mm Wind Screen Measurement Uncertainty 5600 5623.41 0.3 -0.3 0.5 -0.8 -0,3 0.30 6000 5956.62 -0.4 0.4 0.4 0.0 -0,4 0.30 6300 6309.57 -0.1 0.1 0.3 -0.3 -0,4 0.30 6700 6683.44 0.4 -0.4 0.3 -0.7 -0,4 0.30 7100 7079.46 -0.6 0.6 0.2 0.4 -0,3 0.30 7500 7498.94 0.1 -0.1 0.1 -0.
Appendix Frequency Weighting Nominal Frequency Hz Frequency Weighting dB A C Z 10 –70.4 –14.3 0.0 12.5 16 20 –63.4 –56.7 –50.5 –11.2 –8.5 –6.2 0.0 0.0 0.0 25 31.5 40 –44.7 –39.4 –34.6 –4.4 –3.0 –2.0 0.0 0.0 0.0 50 63 80 –30.2 –26.2 –22.5 –1.3 –0.8 –0.5 0.0 0.0 0.0 100 125 160 –19.1 –16.1 –13.4 –0.3 –0.2 –0.1 0.0 0.0 0.0 200 250 315 –10.9 –8.6 –6.6 0.0 0.0 0.0 0.0 0.0 0.0 400 500 630 –4.8 –3.2 –1.9 0.0 0.0 0.0 0.0 0.0 0.0 800 1000 1250 –0.8 0 +0.6 0.0 0 0.0 0.0 0 0.
Appendix Directional Response (dB) Based on the sound-incidence angle. (Refer IEC61672-1 paragraphs 5.3.1, 5.3.2 and 9.2.2b) Nominal Frequency [Hz] 250 315 400 500 630 800 1000 1060 1120 1180 1250 1320 1400 1500 1600 1700 1800 1900 2000 2120 2240 2360 2500 2650 2800 3000 3150 3350 318 Actual Frequency [Hz] 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 251.19 316.23 398.11 501.19 630.96 794.33 1000.00 1059.25 1122.02 1188.50 1258.93 1333.52 1412.54 1496.24 1584.89 1678.80 1778.
Appendix Nominal Frequency [Hz] 3550 3750 4000 4250 4500 4750 5000 5300 5600 6000 6300 6700 7100 7500 8000 8500 9000 9500 10000 10600 11200 11800 12500 13200 14000 15000 16000 17000 18000 19000 20000 Actual Frequency [Hz] 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 3548.13 3758.37 3981.07 4216.97 4466.84 4731.51 5011.87 5308.84 5623.41 5956.62 6309.57 6683.44 7079.46 7498.94 7943.28 8413.95 8912.51 9440.61 10000.00 10592.50 11220.20 11885.00 12589.30 13335.20 14125.40 14962.
Appendix Nominal Frequency [Hz] 250 315 400 500 630 800 1000 1060 1120 1180 1250 1320 1400 1500 1600 1700 1800 1900 2000 2120 2240 2360 2500 2650 2800 3000 3150 3350 3550 3750 4000 4250 4500 4750 320 Actual Frequency [Hz] 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 251.19 316.23 398.11 501.19 630.96 794.33 1000.00 1059.25 1122.02 1188.50 1258.93 1333.52 1412.54 1496.24 1584.89 1678.80 1778.28 1883.65 1995.26 2113.49 2238.72 2371.37 2511.89 2660.73 2818.
Appendix Nominal Frequency [Hz] 5000 5300 5600 6000 6300 6700 7100 7500 8000 8500 9000 9500 10000 10600 11200 11800 12500 13200 14000 15000 16000 17000 18000 19000 20000 Actual Frequency [Hz] Angle in Degrees 90 95 5011.87 -1.54 -1.54 5308.84 -1.97 -1.84 5623.41 -1.90 -1.97 5956.62 -1.98 -2.40 6309.57 -1.97 -2.41 6683.44 -2.28 -2.33 7079.46 -2.70 -2.53 7498.94 -3.25 -3.15 7943.28 -3.29 -3.52 8413.95 -3.34 -3.64 8912.51 -4.04 -4.17 9440.61 -4.08 -4.32 10000.00 -4.41 -4.95 10592.50 -4.84 -5.66 11220.
Appendix Information for Calibration Type Description • Integrating sound level meter type NTi Audio XL2-TA Standards The XL2-TA Sound Level Meter has been certified in accordance with the class 1 requirements of • ISO 61672-1 (2014 und 2003) • ISO 61672-2 (2014 und 2003) • ISO 61260 (2014 und 2003) • DIN 45657 (2014) • Welmec 7.
Appendix Compulsory Calibrated Applications The following acoustic measurements have been verified by German PTB during the type approval process: Instantaneous sound pressure levels: • LAF A-weighted sound pressure level with time weighting FAST • LAS A-weighted sound pressure level with time weighting SLOW • LCF C-weighted sound pressure level with time weighting FAST • LCS C-weighted sound pressure level with time weighting SLOW • LZF unweighted sound pressure level with time weighting FAST • LZS unweig
