BRUEL & KJAER 2221 - Measurement Procedures

3. Fit the Sound Level Calibrator with a 112 " adaptor (B & K no. DB 0311) over the
microphone
4. Start the Sound Level Calibrator and press RESET on the Sound Level Meter
5. Wait for the displayed value to stabilize and read the display which should be 93,8 dB
±0,1 dB.
6. If an adjustment is necessary, remove the plastic plug on the top of the instrument
and with a small screw driver turn the potentiometer a few degrees:
- clockwise if the displayed value is less than 93,8 dB
- anticlockwise if the displayed value is greater than 93,8 dB.
7. Repeat steps 4 to 6 until the correct value is obtained. Remove the Sound Level
Calibrator and replace the plastic plug.
Fig. 3.3. Calibration with Sound Level Calibrator Type 4230
3.5. SOUND LEVEL MEASUREMENT
3.5.1. General
Before proceeding with a measurement, the accompanying booklet "Measuring Sound"
which contains useful information should be read by users who are not familiar with
sound measurements.
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