30
Preparations
12. Turn off the sound calibrator or the pistonphone and NL-21/NL-31.
13. Remove the microphone very carefully and slowly from the coupler.
Note
For details on operation of the NC-74 or NC-72,
please refer to the instruction manuals for them.
For information about compensation for atmospheric
pressure, please refer to the documentation of the
pistonphone NC-72.
The NC-74 is designed to produce 94.0 dB under its
rated conditions, but in actual calibration, the sound
field compensation value which depends on the sound
level meter must be taken into consideration. For the
NL-21, adjust the reading to 93.9 dB. For the NL-31,
use 94.0 dB.
Language selection
The language for the message on the screen can be selected. While holding
the Mode key down, turn the unit on, select language screen is displayed.
You can select the language among English, German or Spanish. After select
the language, press Start/Stop key.
The selected language is memorized in the unit, the message is displayed in
the selected language when power is turned on. As for the messages in each
language, see page 136.
N C - 7 2
N C - 7 4
N L - 2 1
9 3 . 9 d B
N L - 3 1
9 4 . 0 d B
O u t p u t s o u n d p r e s s u r e l e v e l
i m p r i n t e d o n N C - 7 2
11. Use the Cal Adj and keys to adjust the sound pressure reading of
the NL-21/NL-31 according to the table below.
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