MEWOI MEWOI-JY218, User Manual, Page: 11 / 16

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VIII. Calibrating the meter
Before making a measurement, it is important that you calibrate
your instrument with an acoustic calibrator.
To start the process of calibration, ensure the microphone is fitted
correctly and place the acoustic calibrator over the microphone.
Press to enter the calibration menu.
Use the arrow keys to set the CAL LEVEL to the acoustic
calibration level (Normally 1kHz 94.0dB for the calibrator).
Use the arrow keys to set the CORRECT value to 0.2dB, which will
make the adjustment for the gap between the calibrator and the
microphone (pressure field of the acoustic calibrator and the free
field of the instrument and microphone).
This will result in the meter reading 93.8dB when a 94dB calibrator
is used.
Switch on the acoustic calibrator and press to automatically
calibrate the meter.
Press to exit from the calibration display and to return back to
the main display.
IX. Reference Information for Periodic Testing
Reference level (1kHz) 94dB
Reference level (8kHz) 92.9dB (A)
Linear range 8kHz 30-130dB