Rion NC-75, Инструкция по эксплуатации

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15
Calibration
6. Wait until the sound level meter reading has stabilized. Then read
the indicated value. Verify that this reading is at least 20 dB higher
than the reading obtained in step 3.
Important
If the difference is less than 20 dB, ambient noise
has too much infl uence on the measurement, and
correct calibration will not be possible.
7. Adjust the sound level meter so that its level reading is 94 dB (calibration
value, see Note below).
Note
Depending on the sound level meter and microphone
type, this calibration value may vary.
For details on precise calibration values, please refer
to the “Reference” section on page 17 or to the docu-
mentation of the sound level meter and microphone.