Extech Instruments SL400 User Manual page 9

Calibration
Automatic Mode Calibration
Set the meter to SLM mode, A weighting, High range, and Slow.
Attach a 94.0dB (1000Hz) sound calibrator to the microphone.
Enter SET mode and go to the parameter 94ADJ.
Press the Run
to appear.
Press the Enter
The meter should now read 94.0dB (+/‐ 0.1dB).
If the measured value does not equal 94.0 (+/‐ 0.1dB), run the 94ADJ routine again.
Press the Enter
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key to start the automatic offset routine and wait for the flashing dB number
key to save the entry and to get back to the measure window.
key to save the entry and to get back to the measure window.
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