MEASURING
INSTRUMENTS
Page 7 of 8
3 MEASURING PROCEDURE
Put the power switch (Ref. 3-4 Figure 1) into the ON position.
Setting the off-scale: position the switch for the measurement / setting (Ref. 3-5
Figure 1) to "SET", change the value on the display as required (up to a maximum of
between 120 dB and 130 dB) by adjusting the resistance (Ref. 3-3 Figure 1).
Always check that the selected function is correct. To select the function, press the
function selection button (Ref. 3-15 Figure 1).
A) When the "SL" LED is lit, noise levels can be measured instantaneously.
B) When the "Leq" LED is lit, it is possible to measure the average level of noise
recorded in a minute.
C) When the "L
N
" LED is lit, it is possible to transfer the output data for statistical
analysis.
Always check that the weighting selected is correct. To select the weighting, press the
weighting / memory button (Ref. 3-13 Figure 1).
A) When the "A" LED is illuminated, weighting A has been selected.
B) When the "C" LED is illuminated, weighting C has been selected.
C) When the "LIN" LED is illuminated, you have selected the weighting required to
transfer linear measurements externally.
D) When "FILTER" button is illuminated an external filter can be entered.
NOTE: the "A" LED will turn on automatically when the "Leq" or "L
N
" function has been
selected
Position the "fast / slow" switch in the correct position.
Position the switch to "MEAS" (measurement).
If the "Hold/memory" button is pressed, the "MAX" symbol appears on the display: it is
now possible to read the maximum noise instantaneously.
3.1
Memory
The maximum measured value is automatically stored on your instrument. To view it, turn off
the sound level meter and press the Hold/memory button.
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