12
Calibration
To make the calibration, place the units in a perpendicular
position, as shown in the illustration at left.
1. Make sure that the power switch of the NC-75 is OFF.
2. Carefully insert the microphone of the sound level meter
all the way into the coupler of the sound calibrator.
Important
The microphone of the sound level meter must always
be inserted or removed slowly and carefully, to avoid
the possibility of damage to the microphone diaphragm
caused by abrupt changes in air pressure.
When mounting and dismounting the microphone and
sound calibrator, do not rotate the sound level meter
or sound calibrator. Otherwise the protective grid of
the microphone may become loose or detached,
causing damage to the microphone diaphragm.
Summary of Contents for NC-75
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