A comparison on WS2P microphone with both coupler comparison and electrostatic actuators method

To verify the calibration capability of different acoustic measurement laboratories in China, a comparison on the sound pressure sensitivity of working standard microphone was carried out. Seventeen laboratories were divided in two groups and B&K 4192 microphone was used as the comparison sample. Both coupler comparison method and electrostatic actuators method were adopted for the measurement from 20 Hz to 20 kHz. Most of the results from the 17 laboratories agreed with each other. It also find that some helpful information for few laboratories. One of them is that the cavity volume correction during the use of piston calibrators was missed. Another is some couplers were not suitable for simultaneous calibration of WS2P microphone at high frequency more than 16 kHz due to the cavity size. And extra error could be led in sequential comparison method without the monitor microphone due to the volume variation during the measurement.