CEL-600 SERIES SOUND LEVEL METER HB3340-02 OPERATOR’S MANUAL CASELLA CEL Regent House, Wolseley Road, Kempston, Bedford, MK42 7JY, U.K. Phone: +44 (0) 1234 844 100 Fax: +44 (0) 1234 841 490 E-mail: info@casellacel.com Web: www.casellacel.com August 2009 CASELLA USA 17 Old Nashua Road, # 15, Amherst, NH 03031, U.S.A. Toll Free: +1 (800) 366 2966 Fax: +1 (603) 672 8053 E-mail: info@casellaUSA.com Web: www.casellaUSA.com CASELLA ESPANA S.A.
Casella CEL Limited
TABLE OF CONTENTS SECTION TITLE PAGE 1 Introduction 4 2 Instrument Features 4 3 Operation 7 3A Switch On 7 3B Setting Screens 8 3C Date & Time Screens 11 3D Set Language 12 3E Set Backlight 12 3F Set Run Duration 14 3G Calibration ref Level 15 3H View Memory Results 16 3I Delete Memory results 17 3J Run Screens 18 3K Instrument Calibration 19 3L Extracting Data 20 3M System Tools 21 4 Storage 21 5 Low and High Level Sound 21 6 Specifications 23 7
1. INTRODUCTION CEL-600 Series is a range of Sound Level Meters been designed to meet the demands of worldwide industrial health and safety professionals as well as general noise measurement applications. The instrument encompasses functionality from basic sound level measurement to integrating and real-time octave band analysis. The CEL-600 instrument is based on the very latest digital signal processing technology and has a crisp, vibrant colour TFT LCD display.
To navigate within a screen use the Cursor Keys (6). Not all the screens have navigable fields on the display. To navigate from one screen to another, use the Soft Keys (5). To start a ‘run’ (measurement), press the Start key (7); to stop the run press the same key again. The instrument has a single measurement range to 140dB (RMS) and 143.3dB (C) peak. No range adjustment is needed which greatly simplifies operation.
BATTERY INSTALLATION (Refer to Figure 2) CAUTION: The batteries can be zinc carbon, alkaline or rechargeable. Do not mix battery types. The CEL-62X Instrument requires three AA batteries. Remove the battery compartment cover. Check correct polarity. Fit the batteries. Refit the battery cover. Press and release the ON/OFF Key. Check the battery condition symbol shows the battery has a good charge. Note: For long term tests, where the batteries may become exhausted, use a 12VDC supply to power the CEL-62X.
3. OPERATION A. SWITCH ON the CEL-62X INSTRUMENT (Refer to Figure 3) Press the red power key to switch the instrument on (see Figure 1). The instrument software screens have been designed with colour coded top and bottom bars to enable the user to know at a glance which part of the firmware (operating system) is currently being accessed. Colour coding is as follows: RED – Stop screens.
Figure 3 Switch ON the CEL-62X B. SETTINGS SCREENS (Refer to Figure 4) Note: Press EXIT (A) at any time to go back to the previous screen. SETTINGS The Settings menu allows configuration of instrument setup, time/date, language, backlight, run duration timer and calibration level. Use Cursors (C) to select the Settings icon (1) and press Select (B). CHANGING FROM 1/1 OCTAVE TO 1/3 OCTAVE CEL-62XC models have both 1/1 octave and 1/3 octave functionality.
MEASUREMENT VIEW. Predefined views are available to satisfy measurements for international workplace noise legislation. Use the cursor keys (C) to select the required view and press (B) to activate the measurement view. The Measurement View with the word ACTIVE next to it will be used for measurement runs. To view the details press View (B).
USER 1 AND 2 MEASUREMENT PARAMETERS The Functions screens allow the Operator to select up to nine functions for the measurement ’run’. A counter replaces the battery level indicator at the foot of the screen. The counter displays the number of parameters selected. Press the Functions key (B) and use the cursor keys (C) to navigate up/down/left/right. The first screen shows Sound Pressure Level (SPL) and Leq values. The parameters displayed during a measurement run are highlighted in green.
C. DATE AND TIME SCREENS (Refer to Figure 5) SETTINGS From the Menu select the Settings icon (1) and press (B) to select. SET CLOCK Use the cursors (C) to select the Set Clock icon and press (B) to select. SET TIME The screen will be displayed with the Time highlighted. To set the time press Edit (B). The hour will be highlighted. Adjust the hour setting use the Up/Down cursors. Press the cursor key (C) to highlight the minutes. Adjust the minutes setting use the Up/Down keys.
D. SET LANGUAGE (Refer to Figure 6) LANGUAGE From the Menu select Settings (1). Use the cursor keys (C) to navigate to the World icon (2). Press Select (B). Use cursors (C) to select the desired language and press (B) to select. Press Exit (A) when finished. Figure 6 Set Language E. SET BACKLIGHT (Refer to Figure 7) BACKLIGHT From the Menu select Settings (1). Use the cursor keys (C) to navigate to the Backlight icon (2). Press Select (B). Figure 7 Set Backlight (Sheet 1) ACTIVATION.
DURATION. If the Activation mode is set to Keypress, the duration the backlight remains on can be set. Press cursor key (C) to navigate to highlight Duration. To set the Duration press Edit (B). The Duration field will be highlighted with the Minutes enabled. To change the minutes use the Up/Down keys (C). Use cursor keys (C) to highlight the seconds. To change the seconds use the Up/Down cursors (C). When the Activation mode has been set, press Save (B). Figure 7 Set Backlight (Sheet 2) BRIGHTNESS.
F. SET RUN DURATION (Refer to Figure 8) RUN DURATION The Duration timer allows measurements runs to be performed over a specified time. At the end of this time the measurement will automatically be stopped. From the Menu select Settings (1). Use the cursor keys (C) to navigate to the Run Duration icon (2). Press Select (B). DURATION TIMER Press (B) to edit the Duration timer to either On or Off and use cursors (C) to change the selection. Press Save (B) to continue.
G. CAL. REF. LEVEL (Refer to Figure 9) Note: For Instrument Calibration refer to Section K – Calibration Screens. For free field and microphone corrections to the calibrator level refer to “Sound Calibrators – Level Corrections” in Appendix B. CAL. REF. LEVEL The Calibration Reference Level is used to set the instrument’s calibration level to the exact level of your calibrator plus any other required corrections. Calibration levels can be set from 93-95dB or 113-115dB. A 1kHz calibrator must be used.
H. VIEW MEMORY RESULTS (Refer to Figure 10) This is where the results from completed measurements are stored. The Memory Results are stored in a chronological order, with the latest measurement at the top of the list. MEMORY RESULTS From the Menu screen, use the cursor keys to select the Memory Results icon (1). Press Select (B) to access the memory. Use the Up/Down cursors (C) to navigate the listed results. When a Memory Result has been selected, press Select (B) to access the measurement.
Figure 10 View Memory Results (Sheet 2) I. DELETE MEMORY RESULTS (Refer to Figure 11) From the chronological list of measurement runs, use the Up/Down cursors (C) to navigate the listed results. When a Memory Result has been selected, press Select (B) to go to the next screen. This screen gives the operator the choice to view the selected memory result, or to delete it. Select Delete and press Select (B).
J. RUN SCREENS (Refer to Figure 12) The Instrument has four Run screens: The Main screen, the Graph screen, the Octaves screens and the Octaves Values screen, the last two of which are only available on the CEL-62XB and CEL-62XC. Switch ON the instrument as detailed in Figure 3. CEL-62XA – Press the RUN/STOP Key (D) to go to the Graph screen. CEL-62XB and CEL-62XC– OCTAVE screen. Press the RUN/STOP Key (D) to go to the Octaves screen (or 1/3 Octave on CEL-62XC model).
Figure 13 CEL-62XA Run Screens CEL-62XB & CEL-62XC (Refer to Figure 14). The CEL-62XB and CEL-62XC provides two additional octave screens shown in Figure 14. Use the View key (B) to toggle the four available screens. Use the left/right cursor keys (C) to move across the frequency bands (1) when in graphical view. Use up/down cursor keys (C) to toggle between LMAX and LEQ parameters (2). Each graph bar represents an octave band measured in Hz or kHz. To view a table of the octave values, press View (B).
Remove the acoustic calibrator. Press EXIT (A) to go back to the Stop screen. Press and hold the acoustic calibrator ON/OFF Key to switch the calibrator off. Figure 15 Instrument Calibration L. EXTRACTING DATA (Refer to Figure 16) Each measurement run is stored as a file within the CEL-62X in a .CSV format. This format will automatically open with MS EXCEL or similar office applications. The files are named consecutively from 1 to 100, so the first run will be named R001.CSV.
M. SYSTEM TOOLS (Refer to Figure 17) The system tools menu can be accessed from the startup screen by pressing the left/right cursor keys (C) together. Note that these functions need not be used within general operation and stored results will be lost if incorrectly used. Their primary function is for calibration laboratories or diagnostic purposes. Three options are available: ‘Recover USB Disk Files’ copies files stored in the backup E2 memory to the USB disk.
Note: As the CEL62X is a single range instrument capable of reading to zero dB, and the only non linearity error will be due to self generated noise, then there is no underrange indicator. Lact = 10log(10 Where (Lms)/10 – 10 (Lsg)/10 ) Lact = Actual corrected sound level Lms = Measured sound level Lsg = Self generated noise level High Level Sound (Overload).
6. SPECIFICATIONS GENERAL The CEL-62X provides SPL, Integrating and Octave band noise measurement compliant with the following international standards:IEC 61672-1 2002-5 (Electro-Acoustics – Sound Level Meters) Group ‘X’ instruments. Performance of Class 1 or 2 as relevant to instrument model. IEC 60651: 1979, IEC 60804: 2000, ANSI S1.4: 1983, ANSI S1 1/1 Octave and 1/3 Octave Filters comply with EN61260: 1996, Class 0 and ANSI S1.11 1986, Order-3 Type 0C.
OPERATING ENVIRONMENTAL CONDITIONS Humidity: 5 to 90%RH in the absence of condensation. Temperature range: -10 to +50oC (Class 1), 0 to +40oC (Class 2) Pressure: 65 to 108kPa EFFECT OF TEMPERATURE Electrical stability of instrument < ±0.2 dB over the range -10 to +50oC EFFECTS OF HUMIDITY Less than ±0.5dB over the range 25 to 90% relative humidity (non-condensing), relative to the value at reference conditions. STORAGE ENVIRONMENTAL CONDITIONS Humidity: 0 to 90%RH in the absence of condensation.
TRIPOD MOUNTING Socket to mount on standard 1/4" (Whitworth) camera tripod thread. DISPLAY 320x240 Transmissive Colour TFT. Update period 0.5 seconds. MEMORY Micro SD 1GB Non-volatile internal. CONNECTIVITY (Refer to Figure 18) USB: Mini B to download to dB36 software or to explore via Windows Explorer to obtain .CSV file. AC OUTPUT: Via 2.5mm stereo audio jack (Barrel ground, Tip AC output) provided for remote monitoring, DAT tape / PC wav file recording or headphone applications. Approx 0.
AVAILABLE PARAMETERS Broadband DISPLAYED FUNCTIONS SLM RESPONSE RMS Weight Time Weight (w) (t) Z C A F S I NOTES Function Format Displayed Example SPL L(wt) LAF √ √ √ √ √ SPLmax L(wt)mx LZSMAX √ √ √ √ √ SPLmin L(wt)mn LZSMIN √ √ √ √ √ LWEQ LAEQ, √ √ √ NA NA Lpeak L(w)Pk LCPEAK √ √ √ NA NA LIEQ integrating L(w)IEQ LAIEQ NA NA √ NA NA LAEQ T80 LAEQ T80 LAEQ T80 NA NA √ NA NA LAEQ with NA Threshold and Q=3 (ACGIH) L(w)E LAE NA NA √ NA NA NA LTM3
Additional 1/1 Octave & 1/3 Octave Band Functions for CEL-62XB & CEL-62XC DISPLAYED FUNCTIONS Function SLM RESPONSE RMS Weight Time Weighting (w) (t) Z C A F S I Displayed Format Example SPL L(wt) LAF √ √ √ √ √ NA SPLmax L(wt)mx LZSMAX √ √ √ √ √ NA LEQ integrating LWEQ LAEQ, √ √ √ NA NA NA NOTES Only Z weighting is saved Only Z weighting is saved DEFAULT SETUP MATRIX ISO OSHA DOD ACGIH USER 1 USER 2 3 5 4 3 3 5 0 80 80 80 0 Broadband Parameters LAF LAeq LCeq
7. SERVICING AND WARRANTY ARRANGEMENTS To ensure conformity with the specification, this instrument is thoroughly inspected and it’s accuracy verified prior to dispatch. All technical information is filed under the instrument serial number, which should be quoted in any correspondence. The manufacturer undertakes to rectify any defect in the instrument directly attributable to faulty design or assembly and which becomes apparent during the warranty period.
8. APPENDIX A GLOSSARY OF TERMS This Appendix gives a glossary of the acoustic terminology used in this manual. For further information, please contact Casella CEL or your local representative. A, C and Z WEIGHTING (WEIGHTED) A standard weighting of the audible frequencies designed to approximate the response of the human ear to noise.
included. For example, assume the threshold level is set to 80dB and the exchange rate is 5dB (Q = 5). If a one hour measurement was taken in an environment where the noise levels vary between 50 and 70dB, the sound level would never exceed the Threshold so the instrument would record no value for the LAVG.
9. APPENDIX B ADDITIONAL INFORMATION IEC61672-1:2002 section 9.3 (Information for testing) a) Reference Sound Pressure Level The reference sound pressure level is selectable to be 94 dB or 114 dB. b) Reference Level Range The CEL-62X is a single level range instrument of 0 to 140 dB. c) Microphone Reference Point The microphone reference point is the centre of the diaphragm of the microphone. The 0o reference direction is perpendicular to the microphone diaphragm.
e) Linear Operating Range The lower and upper limits of the linear operating ranges for electrical input, or using a CEL-251 microphone; (add 10dB to the lower limit when using a CEL-252 microphone) Weighting A C Z C Peak 31.5 Hz 30 to 100 32 to 137 38 to 140 65 to 140 1 kHz 30 to 140 32 to 140 38 to 140 65 to 143 4 kHz 30 to 141 32 to139 38 to 140 65 to 142 8 kHz 30 to 138 32 to 136 38 to 140 65 to 139 12.
12VDC supply range is 9 to 14 volts. USB supply range is 4.5 to 5.5 volts. k) Display Device The display device will display the complete linear operating range. l) Environmental Stabilisation Time The typical time to stabilise after sudden changes in environment conditions. 5 minutes after a 10 oC change in temperature. 5 minutes after a 30% change in humidity (non-condensing). 15 seconds after a 5kPa change in ambient pressure.
Casella CEL-62X with CEL-251 Microphone Free Field response with and without Wind Screen.
CEL-62X with CEL-251 Microphone directional response (dB) relative to zero degrees. Orientation of CEL-62X - Display at 0 degrees relative to ground. Nominal Frequency (Hz) Actual Frequency (Hz) 0 Deg 10 Deg 20 Deg 30 Deg 40 Deg 50 Deg 60 Deg 70 Deg 80 Deg 90 Deg 100 Deg 110 Deg 120 Deg 130 Deg 140 Deg 150 Deg 500 501.19 0.00 0.01 0.01 0.00 -0.02 -0.05 -0.09 -0.20 -0.20 -0.26 -0.32 -0.35 -0.37 -0.36 -0.36 -0.34 630 630.96 0.00 0.02 0.04 0.05 0.06 0.06 0.05 -0.
CEL-62X with CEL-251 Microphone directional response (dB) relative to zero degrees. Orientation of CEL-62X - Display at 90 degrees relative to ground. Nominal Frequency (Hz) Actual Frequency (Hz) 0 Deg 10 Deg 20 Deg 30 Deg 40 Deg 50 Deg 60 Deg 70 Deg 80 Deg 90 Deg 100 Deg 110 Deg 120 Deg 130 Deg 140 Deg 150 Deg 500 501.19 0.00 0.00 0.00 0.00 -0.01 -0.03 -0.06 -0.11 -0.16 -0.21 -0.25 -0.27 -0.28 -0.28 -0.28 -0.27 630 630.96 0.00 0.00 0.02 0.04 0.06 0.07 0.06 0.
Sound Calibrators – Level Corrections Sound level calibrators apply sound pressure to a microphone in a closed cavity. The response of a microphone in a free field at 1kHz will be slightly different to that of a pressure field. Also some calibrators are affected by the volume of the microphone changing the volume of the calibrator cavity. The wind screen has an affect on the free field response at 1kHz and this can be compensated for during calibration.
