On your Sound Level Meter, navigate the menu to the Calibration screen Carefully place the calibrator over the microphone Activate the calibrator to produce the desired tone, normally 94dB Press OK to begin the calibration procedure and leave the calibrator in place untill the process is complete Your Sound Level Meter will notify you when the calibration is complete If the sound meter passes, you’re good to go and perform your measurements It’s recommended that you check your sound meter against the calibrator to see if the accuracy has drifted. Any drift should be noted within your report.

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