Rion NC-75, Инструкция по эксплуатации

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13
Calibration
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 air
pressure inside the sound calibrator will change,
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 documentation of the
microphone or the sound level meter.
4. Select the measurement range of the sound level meter so that 94 dB
can be measured.