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2.9 Calibration
The sound level meter calibration requires a standard acoustic
calibrator (94dB, 1kHz sine wave). Remove the back cover of the
meter by unscrewing the four screws at the corners. Keep the
battery compartment closed and the battery connected. Locate the
calibration potentiometer near the top of the circuit board.
Turn on the sound level meter and set it to A weighting, Fast
response, and a range of 70 ~ 130dB. Carefully insert the
microphone into the 1/2 inch hole of the calibrator set to 94dB @
1kHz. Adjust the calibration potentiometer with a small screw
driver. Reattach the back cover.
Note: The instrument has been calibrated before shipment. The
recommended calibration interval is one year.
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