BRUEL & KJAER 4230 - Further Calibration

4. Further calibration
The Sound Level Calibrator Type 4230 is made for field calibration of
sound measuring systems. For complete calibration of condenser micro-
phones
with regard to sensitivity and frequency response, use should be
made of the B & K Microphone Calibration Apparatus Type 4142 (Fig.4.).
This
includes equipment for reciprocity calibration to a very high accuracy,
and
electrostatic actuators for precise determination of microphone fre-
quency response.
Fig.
4.
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Microphone Calibrating Apparature 4142.
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