User manual

Hand-held Analyzer Types 2250 and 2270 – User Manual
210
Measurement Display and Control
OVERVIEW MAP
Map of Source and Receiver positions with
reverberation time readout for a selectable frequency
band on each measurement position together with
quality indicator
Organisation of Source and Receiver Positions:
measure at all receiver positions for each source or
measure in a number of positions (1 to 10) for each
source
Source and Receiver positions can be added, moved
or deleted
OVERVIEW TABLE
Table of measurement positions with reverberation
time readout for selectable frequency band on each
position together with quality indicator
Positions can be included/excluded from Room
average
SOUND LEVEL SPECTRUM
LZF spectrum plus A and C broadband bars
Y-axis: Range: 5, 10, 20, 40, 60, 80, 100, 120, 140 or
160 dB. Auto zoom or auto scale available
Cursor: Readout of selected band
Quality indicator for each frequency band
REVERBERATION TIME SPECTRUM
One or two spectra can be displayed
Y-axis: Range: 0.5, 1, 2, 5, 10 or 20 s. Auto zoom
available
Cursor: Readout of selected band
Quality Indicator for each frequency band
REVERBERATION TIME SPECTRUM TABLE
One or two spectra can be displayed in tabular form
DECAY
Decay curve for a position or the room average
available for each frequency band
Display of evaluation range and regression line
Readout of Curvature in %
Y-axis: Range: 5, 10, 20, 40, 60, 80, 100, 120, 140 or
160 dB. Auto zoom or auto scale available
MEASUREMENT CONTROL
Measurement Sequence: Supports measuring:
• at all receiver positions before using another source
• at a receiver position for all sources before
measuring at a new position
• at subsequent receiver positions without source
information, or
• at manually selected source and receiver positions
During measurement, the instantaneous sound level
spectrum is displayed. After measurement, the
reverberation time is displayed
Interrupted Noise Excitation: Measurements are
started manually and can be automatically stored on
completion of measurement
The noise generator is turned on and off automatically
Escape Time: 0 to 60 s
Build-up Time: 1 to 10 s
Number of Decays per Measurement: 1 to 100,
ensemble averaged into one decay
The generator can be turned on and off manually for
checking equipment and sound levels
Serial Measurements: Selected frequency bands can
be measured serially, that is, one by one in an
automatic sequence. This can be done automatically
in combination with the parallel measurement
Impulse Excitation: Manual start of first
measurement. When level (say from starter pistol)
exceeds the user-selected trigger level, the decay is
recorded and backwards integration performed
(Schroeder method). The trigger can then be armed
automatically for measuring at the next position
Signal Recording: (requires license for Signal
Recording Option BZ-7226) Recording of the Z-
weighted measured signal can be done at each
position. For data storage, Signal Recording requires:
• SD Card: All hardware versions
• CF Card: Hardware versions 1 – 3
• USB Memory Stick: Hardware version 4
Measurement Status
ON SCREEN
Information such as overload, awaiting trigger and
running/paused are displayed on screen as icons
TRAFFIC LIGHT
Red, yellow and green LEDs show measurement
status and instantaneous overload as follows:
• Yellow LED flashing every 5 s = stopped, ready to
measure
• Green LED flashing slowly = awaiting trigger or
calibration signal
• Green LED on constantly = measuring
• Yellow LED flashing slowly = paused, measurement
not stored
• Red LED flashing quickly = intermittent overload,
calibration failed
Calibration
Initial calibration is stored for comparison with later
calibrations
ACOUSTIC
Using Sound Calibrator Type 4231 or custom
calibrator. The calibration process automatically
detects the calibration level when Sound Calibrator
Type 4231 is used