Rion NL-21 - Page 40

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Preparations
Acoustic calibration with sound calibrator NC-74 or pistonphone NC-72
For acoustic calibration, the Rion sound calibrator NC-74 or pistonphone
NC-72 is mounted to the microphone of the sound level meter, and adjustment
is performed so that the reading of the meter is equal to the sound level
inside the coupler.
Important
Be very careful when inserting and removing
the microphone to and from the coupler, to
avoid a sudden pressure buildup which could
destroy the membrane of the microphone.
1. Turn off the sound calibrator or the pistonphone.
2. Turn on the NL-21/NL-31.
3. Press the Menu key to bring up the menu screen 1/5.
4. Verify that the Cal Mode is set to "External".
If "Internal" is shown, use the and keys to move the cursor to
"Internal" and use the and keys to set it to "External".
S t a r t
S t o p
S t o r e M o d e
P a u s e
C o n t
F a s t S l o w
M e n u
P a g e
R a n g e
R e c a l l
F r e q
L i g h t P r i n t
P o w e r
S O U N D L E V E L M E T E R
R e c a l l
d a t a
D o w n
C a l a d j
C a l
U p
A C
F L A T
N L - 2 1
O p e r a t i o n k e y s
M e n u k e y
P a g e U p / D o w n k e y s
C a l k e y
, k e y s
, k e y s
1 5
< S y s t e m >
M e a s . t i m e : 1 0 m i n
B a c k E r a s e : O f f
C a l M o d e : E x t e r n a l
F i l t e r : O f f
C a l M o d e
M e n u s c r e e n 1 / 5