5.3 Classical sound level meter and averager integrator function
The sound level meter processes the signal sound pressure and simultaneously provides the following information :
•
LXY :
the sound pressure level weighted temporally.
•
LXYmax and LXYmin :
maximum and minimum values of the levels on measurement time.
•
Lupk :
level of maximum peak of sound pressure on the measurement time.
•
LXeq :
equivalent continuous level of acoustic pressure frequency weighted on measurement time.
5.3.1 Adjustment prior to measurement
1
– Select
L-Leq
mode
: move the cursor with arrow keys to
1
and select
'L-Leq'
with the scrolling knob key.
2
– Select the weighting frequency and the time weighting.
For each weighting frequency, the sound level meter proposes the measurement according to three time
weightings :
Fast (F) – Slow (S) – Impulse (I)
. Possible choices are :
A
frequency weighting :
LAF
–
LAS
–
LAI
C
frequency weighting :
LCF
–
LCS
–
LC
I
Z
frequency weighting :
LZF
–
LZS
–
LZI
Place the cursor with arrow key on the area
2
and select with scrolling knob identified measurement
criteria among the possibilities listed above.
3
– Select the weighting frequency of peak level of sound pressure : move the cursor with the arrows to
3
and select
C
or
Z
with the scrolling knob key.
5.3.2
Launch the measurement
In
manual
mode : directly press icon ,the timer starts and shows the measurement time. This time is
limited to 24 hours.
In
I/O
mode : see chapter « Launching a measurement in I/O mode ».
5.3.3 During measurement
During measurement,
three screens
inform the current measurement. They are accessible through the
scrolling knob key.
E1 :
it is the main screen that displays the instantaneous measurements.
•
LXY :
the sound pressure level weighted temporally.
•
LXeq :
equivalent continuous level of sound pressure frequency weighted on measurement time.
•
LUpk :
level of maximum peak of sound pressure on the measurement time.
•
Duration of the measurement
expressed in DD / HH: MM: SS
E2 :
This screen contains results of values that will be stored in memory at the end of measurement :
•
LUpk :
level of maximum peak of sound pressure on the measurement time.
•
LXYmax :
maximum value of sound pressure level weighted temporally met since the beginning of
the measurement.
•
LXYmin :
minimum value of sound pressure level weighted temporally met since the beginning of
the measurement.
•
LXeq :
equivalent continuous level of acoustic pressure frequency weighted on measurement time.
•
LXE :
level of exposure to sound frequency weighted
•
D :
Measurement time expressed in DD / HH: MM: SS
•
% :
percentage of saturation of the input stage.
13
Make some measurements
Procedure
1
2
3
Screen 1
Screen 2
