56
Measurement
Note
This unit uses high-speed sampling of the sound
pressure waveform for L
eq
and L
E
processing
(NL-21: 30.3 µs, NL-31: 20.8 µs). The result is
therefore unaffected by dynamic characteristics
and accurate also for a short time period.
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 : I n t e r n a l
F i l t e r : O f f
M e a s u r e m e n t t i m e
( a c t u a l t i m e )
M e n u s c r e e n 1 / 5
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
F a s t
P a g e
D o w n
U p
A C
F L A T
S l o w
P r e s s i n g t h e M e n u k e y e n a b l e s
t h e P a g e U p / D o w n k e y f u n c t i o n
M e n u k e y
A / C / F L A T k e y
P a u s e / C o n t k e y
F a s t / S l o w k e y
R a n g e k e y s
P o w e r k e y
5. Use the menu to set the measurement time.
Press the Menu key to call up the menu screen 1/5.
6. Use the and keys to move the cursor to the "Meas. time" item,
and use the and keys to select the measurement time.
Manual → 10 sec → 1 min → 5 min → 10 min → 15 min → 30 min →
1 hour → 8 hours → 24 hours → Manual → ...
When Manual is selected, the measurement time is controlled by the
operator. The maximum time is 200 hours.
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