Rion NC-74, Instruction Manual

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8
Measurement
3. After inserting the microphone, wait at least 30 seconds before reading the level
indication on the sound level meter. Make a note of the reading, because this will
be used in step 6.
Note
Immediately after inserting the microphone, the change in air
pressure inside the sound calibrator will lead to false readings,
thereby preventing correct calibration. The time required until the
air pressure inside the sound calibrator stabilizes is 30 seconds
or less.
The time required until the air pressure inside the microphone
itself stabilizes depends on the microphone type. Check the docu-
mentation of the microphone or the sound level meter.
4. Select the measurement range of the sound level meter so that 94 dB can be mea-
sured.