System for Secondary Calibration of Microphones
Pressure field, Free-field, and Diffuse field
Simply use the links to learn more about each product area.
Microphone calibration by comparison with a calibrated reference microphone is the only option for the majority of measurement microphones on the market, including WS3 microphones, and a well-designed system allows a very low level of uncertainty to be realised.
NPL can supply an automated measurement system comprising a combination of industry standard and specialised hardware controlled by custom PC software for comparison measurements according to the IEC 61094 series of standards. Pressure calibrations are possible for any set of frequencies in the range 31.5 Hz to 20 kHz for LS2, WS2, and WS3 microphones and for microphone systems, depending on the laboratory facilities available. Free-field comparison frequency range is also dependent on the laboratory available, but typically 31.5 Hz to 12.5 kHz. Diffuse field comparison capability is currently under development and will likely have an operating range of 2 kHz to 20 kHz. All measurements are saved to a database, from which they can be retrieved and output to a spreadsheet at any time.
Available for pressure, free-field, and diffuse field response
Pressure calibration of WS3 microphones
Calibration of complete microphone system (including preamp)
Pressure field sensitivity level uncertainty of 0.07 dB
Best free-field sensitivity level uncertainty of 0.2 dB
System can be modified according to the requirements of the user
Supplied with full documentation, uncertainty analysis, and suggested measurement procedure
Training and support is provided by the scientists and developers