SPL reference

This is the reference level of the calibrator’s output, indicated on the device itself or in the corresponding datasheet. A typical value is -94dB.

SPL trim

This is the offset applied to RMS dB values in order to obtain dB SPL readings. It is determined automatically by the calibration procedure.


Press this button after having insert the microphone into the calibrator socket and activated it in order to determine the SPL trim value.