5.2 Conventional sound level meter with storage function
The sound level meter processes the sound pressure signal and stores with a sampling rate results in a saved memory.
Data measured and stored at a sampling rate :
•
Temporally weighted sound pressure level
•
Maximum and minimum levels on the measurement time.
•
Level of maximum peak sound pressure on the measurement time.
Sampling rate :
Stored data is made at a rate to choose from:
1s, 2s, 3s, 5s, 10s, 15s, 30s, 60s.
5.2.1
Adjustment prior to measurement
1
– Select
L-St
mode
: move the cursor with arrow keys to
1
and select
'L-St'
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.
4
– Select sampling rate : move the cursor to 4 and select with scrolling knob key among 1s, 2s, 3s, 5s, 10s,15s, 30s, 60s.
5.2.2 Launch the measurement
In
manual
mode : directly press icon
In
I/O
mode : see chapter « Launching a measurement in I/O mode »
5.2.3 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.
E2 :
This screen contains results of values that will be stored in memory at the end of measurement:
•
LUpk :
maximum peak level of sound pressure.
•
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.
•
D :
measurement time in DD/HH:MM:SS
•
% :
percentage of saturation of the input stage.
•
Statistics indices :
L01 – L10 – L50 – L90 – L95. They are calculated from stored samples.
11
Make some measurements
Procedure
1
2
3
4
Screen 2
Screen 1
