Acoustic Calibrator Model 104 has been tested and formally EU Pattern Approved by the PTB (under certificate PTB-1.61.4034842), as meeting all of the requirements of the international standard, IEC 60942: 2017. This version of the IEC international standard is far more stringent than previous versions and so far very few manufacturers have managed to meet it. The two models are intended to field calibrate (that is set the sensitivity), of any properly approved noise meter that uses a standard measurement microphone.
To ensure your noise measurements are legally compliant with Noise Regulations you MUST field calibrate your sound level meter before and after taking your measurements; most noise-related regulations stipulate that the noise meter or noise dosemeter is calibrated before each acoustic calibration session and checked again before turning the instrument off. In fact, noise measurements made for ‘official’ use, such as industrial health & safety or environmental monitoring, are not valid unless correct calibration procedures have been followed.
