Sch 1 s 6

Sch 1 s 6 Calibration of sound level instrument

6 Calibration of sound level instrument

(1) The calibration of the sound level instrument must be checked by performing a field calibration, using a field calibrator according to the manufacturer’s instructions, before and after making measurements.

(2) The calibration of a sound level instrument must be checked, and any necessary adjustments be made, immediately before the sound level instrument is used to make the noise level measurements (the pre-test check) and must be checked again after making the measurements and before the instrument is switched off (the post-test check).

(3) If the noise level recorded during the post-test check differs by more than 1dB from the noise level recorded during the pre-test check, then all measurements made in the intervening period must be disregarded.