5.6.1 Adjustment prior to measurement
1
– Choose the
S1 + S2 mode
: place the cursor with the arrow keys to 1 and select '
S1 + S2
' with the scrolling knob key.
2
– Select the frequency weighting.
Possible choices are :
A
frequency weighting -
C
frequency weighting -
Z
frequency weighting (LIN).
Place the cursor with arrow keys on the area
2
and select with scrolling knob
A
,
C
or
Z
.
5.6.2
Make the measurement
➢
Move the cursor to 3 and select «
S1 + S2
» with the scrolling knob key to measure the two
sound sources. In the example, outdoor heat pump
(S1)
in a background noise of day
(S2)
.
➢
Launch the measurement with the pictogram.
➢
Stop the measurement when it seems representative (stabilized evolution of the LXeq
value) with the pictogram.
➢
Stop the
S1
sound source (in the example, heat pump).
➢
Launch the measurement of the
S2
sound source (background noise) with the pictogram.
Measurement of the
S2
sound source will stop by itself after time T chosen for the measurement of the
S1+S2
sound source and the
S1
and
S2
sound source level
is displayed on the sound level meter.
Note :
In case improper handling and/or of calculation impossibility, result will not be displayed.
Example : S1+S2 level is lower than S1, so S2 can not be calculated. Lines will appears on the screen instead of numbers.
5.6.3 Store data
At the end of the measurement it's possible to store data.
➢
Accept measurements and store them : move the cursor on Sto. and press once on OK key to confirm. A banner displays the
storage phase.
19
Make some measurements
Procédure
1
2
3
S1+S2
measurement
S2
measurement
and S1
calculation
Results
Storage
