Comparison calibrations of microphones based on the reciprocity method are performed with both the microphone under test and a reference standard microphone inserted into an acoustical coupler. For these calibrations, the wave motion correction W is needed to account for the departure from spatially uniform sound pressure amplitude in the coupler at frequencies for which the coupler interior dimensions are not small compared to a wavelength of sound. This internal report describes the procedure used to determine the values of W4192 applicable to comparison calibrations of a relatively new working standard microphone, the Bruel and Kjaer model 4192, and provides these values.
Citation: NIST Interagency/Internal Report (NISTIR) - 7526Report Number:
NIST Pub Series: NIST Interagency/Internal Report (NISTIR)
Pub Type: NIST Pubs
Acoustical calibration, calibration of microphones, microphone calibration, NIST microphone calibration, reciprocity calibration, standard microphone, wave motion correction, working standard microphone.