Rion NL-42A, Instruction Manual, Page: 58 / 154

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Calibration
5. Press the CAL key. A calibration screen such as shown below appears.
Verify the “Acoustic Calibration” is displayed in the upper part of
the screen.
If “Internal Calibration” is shown in the upper part of the screen, press
the DISPLAY key. The calibration mode will change to “Acoustic
Calibration”.
6. Use the keys to adjust the reading of the NL-42A/NL-52A to
the value shown below.
When using NC-75/NC-74:
NL-42A: 93.9 dB NL-52A: 94.0 dB
When using NC-72B/NC-72A:
NL-42A: 114.0 dB NL-52A: 114.0 dB
7. Press the CAL key. The measurement screen returns.
8. Turn off the Sound Calibrator NC-75/NC-74 or the Pistonphone NC-72B/
NC-72A and the NL-42A/NL-52A.
9. Remove the microphone very
carefully and slowly
from the coupler.
Note
For details on the Sound Calibrator NC-75/NC-74
or the Pistonphone NC-72B/NC-72A, refer to the
documentation of that product.
For doing an acoustic calibration, when the sound
level meter is inserted vertically into the end of the
sound calibrator NC-75/74 (or pistonphone NC-72B/
NC-72A), please do not leave a gap, and keep it straight.