Pressure calibrator 105

frequencyacousticlevel

Acoustic Calibrator Models 105 (Class 1) and Model 106 (Class 2) have been tested and formally EU Pattern Approved by the PTB (under certificate PTB-1.61.4034842), as meeting all of the requirements of the latest International standard, IEC 60942: 2003 (equivalent to ANSI/ASA S1.40-2006). 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. Both the Models 105 (Class 1 acoustic calibrator) and Model 106 (Class 2 acoustic calibrator) give a standardised 1kHz tone for sound level calibration (calibration level) – the frequency where all weighting networks are the same, at a pressure of 1 Pascal which is a sound level of 94 decibels. They have sensors to correct for temperature, humidity, barometric pressure and battery voltage so that they remain stable and accurate under almost any conditions where they are likely to be used.