18.1Analyzer – integrating averaging with storage sound level meter function –
filters by third octave bands: 1/3 octave
➢
Choose the
1/3 oct
mode: move the cursor with the arrows on the
icon then press
OK
.
The sound level meter works like a frequency analyzer, it treats the acoustic signal according to the temporal mode: on a T(D)
measurement duration with data storage for each DI elementary integration time.
Measured and stored data for each integration time:
•
LAeq, DI:
continuous equivalent level of A weighted acoustic pressure on the elementary integration time.
•
LCeq, DI:
continuous equivalent level of C weighted acoustic pressure on the elementary integration time.
•
LXeq, DI
: continuous equivalent levels of acoustic pressure on the elementary integration time filtered by third octave bands
from
12.5 Hz to 20 kHz (class 1) or from 25 Hz to 10 kHz (class 2).
•
LUpk:
maximum peak level of acoustic pressure on the elementary integration time.
•
Measurement duration expressed in
DD/HH:MM:SS
Integration time
The data storage is carried out according to a DI elementary duration to choose among
: 1/16 s, 1/8 s, 1/4 s, 1/2 s, 1 s, 2 s, 3 s, 5 s,
10 s, 15 s, 30 s, 60 s
.
Read the values before launching the measurement:
In order to dispose of a permanent control of the acoustic pressure level before the real measurement launch, the sound level meter
calculates and displays the continuous equivalent acoustic pressure level on an elementary integration time of
1/8 s
. The result in dB is
displayed with a 2 times per second cadence and 8 times per second for the spectral
graphical representation.
Different values are represented:
•
by a horizontal line for the
max
level
•
a full colored bar for the
global
level
•
an empty bar for the
min
level
Graphical representation: the bars relative to the different filters by third octave bands are
regrouped by octave bands areas.
Read the values:
➢
Move the cursor in position
1
with the vertical arrows then choose with the scrolling knob key the
weighting or filter value, the
LXeq,1/8 s
result is displayed in box
2
.
A vertical line is moving on the screen and is overlapped on the bar corresponding with the weighting
or
filter chosen in
1.
Te reset all of the graphical maximal and minimal representations:
➢
Press on the
OK
icon, the
RST
(3)
function is activated, the different representations (line-
full bar-empty bar) are reset to zero.
70
Options
Max
global
min
E1
130
110
090
080
070
050
030
010
A C Z 16 63 250 1k 4k 16K
65.4
.
125
dB
1/8s 15:37:28
Hz
Man
01s
RAZ
3
2
E1
130
110
090
080
070
050
030
010
A C Z 16 63 250 1k 4k 16K
65.4
.
125
dB
1/8s 15:37:28
Hz
Man
01s
RAZ
1
RST Activation
