General Tools and Instruments DSM8925 User Manual
Page 15
CALIBRATING THE METER
The DSM8925 must be calibrated before
it can make accurate sound level
measurements. To begin, obtain a standard
acoustic calibrator with a 94 dB output, such
as General Tools & Instruments’ SCAL1356.
Then enter Manual Ranging mode and choose
the 80 to 110 dB range using the steps
outlined on p. 9. Changing the response time
is unnecessary. However, make sure that “C”
weighting is chosen and that that the meter is
not operating in MAX HOLD mode.
To calibrate the meter, insert its microphone
in the hole of the acoustic calibrator. Power on
the calibrator and set its output range to the
range containing 94 dB. Using a small Philips-
head screwdriver, turn the calibration
adjustment screw on the right side of the
DSM8925 until its display shows the same
reading as the calibrator’s, ±0.1 dB.
15
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