Working standard microphones:

• Secondary calibration of working standard microphones can offer the most direct and cost-effective traceability path for sound-in-air measurements. However, there is a growing call for these methods to cover microphones having a non-standard pattern.
• Free-field calibration is currently heavily resource-dependent and requires specialised facilities. There is a need therefore to simplify the process and embody requirements of the calibration process in international standards, enabling secondary laboratories to develop such facilities. Associated with this is the requirement to qualify the performance of free-field rooms.

For more information contact Richard Barham.