If I was looking at your noise measurements, the first thing I would ask (even before looking at the measured levels) would be “Did you calibrate the equipment before and after the measurement?” and then “When were the sound level meter AND the acoustic calibrator last calibrated by a suitable calibration laboratory?” This is not an exhaustive list but demonstrates why it is important that noise measurement instruments are calibrated regularly and you are confident that they are measuring accurately.Ī sound level meter (or any noise measurement instrument) should be calibrated otherwise it can be very difficult to show traceability when the measurements are challenged now or in the future.
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