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2.
Operation
The calibrator is made for calibration of 1 in and 1/2 in diameter micro-
phones. An adaptor is placed in the front opening for use with 1/2 in
microphones, and this adaptor is removed when 1 in microphones are cali-
brated. (Fig.2.1)
Fig.
2.1.
Calibrator with Adaptor for 1 /2" Microphone ..
The sound pressure level of the calibrator is 94 dB. However, because of the
increase in sound pressure at a microphone diaphragm when placed in a free
sound field (Fig.2.3), there is a small correction to be subtracted from the
calibration value when calibrating free field microphones. This correction is
0.4 dB for 1 in microphones and 0.2 dB for 1/2 in microphones. For
pressure microphones no correction is required.
4
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