Norsonic nor1216, Instruction Manual

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4 Chapter 3
Microphone calibration
Microphone
calibration
The Nor1216 can be calibrated with a sound calibra-
tor for ½” microphones without the need for special
couplers. We recommend using Nor1251 (1000 Hz) or
Nor1253 (250 Hz).
Unscrew the upper part of the microphone to gain
access to the microphone cartridge. Mount the calibra-
tor slowly and carefully while turning the calibrator and
switch it on. See figure.
If the calibrator frequency is 250 Hz, adjust the
reading to be the level stated for the calibrator, e.g.
124,0 dB for Nor1253 with 124 dB specified level.
If the calibrator frequency is 1000 Hz, adjust the
reading to be 0,1 dB below the stated calibrator level,
e.g. 113,9 dB for Nor1251 calibrator with a stated level
of 114 dB.
Mount the upper part after finishing the calibration.