407790 Datasheet, PDF (8/18 Pages) Extech Instruments Corporation. – Real Time Octave Band Analyzer

FAST _LA
W
dB
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90
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Hz 31.5 125 500 2k
[ 1 / 3 OCT ] 01 / 07/ 27
75.2 dB
8k L W
14:26:39
Calibration
Use a standard acoustic calibrator such as the Extech 407744 or
407766. Acoustic calibration if often performed on a daily basis to
compensate for any possible changes in microphone sensitivity.
1. Configure the following switch settings.
Display: SLM (L_A)
Time weighting: FAST
2. Insert the microphone carefully into the insertion hole of the
calibrator.
3. Turn on the calibrator and adjust its CAL potentiometer so
that the display matches the calibrator output.
4. Note that the 407790 is fully calibrated before shipment.
5. Recommended full recalibration cycle: 1 year.
Measurement Preparation
1. Battery loading: Remove the rear battery cover and insert four 1.5V ‘C’ size batteries.
Take care to observe battery polarity.
2. Battery replacement: When the battery voltage drops below operating voltage,
3. LBATT flashes on the display.
4. AC adaptor connection: Insert the adaptor in the DC 6V jack on the side panel.
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Model 407790 Ver. 2.1 9/07