Carrying Out A Measurement; Performing Measurements - VOLTCRAFT SL-400 Bedienungsanleitung

Line C weighs the frequency spectrum linear and without filter (actual sound level).
Press the button „A/C" to switch this filter. The active filter is shown as „dBA" or
dBC" on the display.
Switching the measuring range
The sound level meter has four measuring ranges.
The bottom range is from 30 to 80 dB,
the medium range from 50 to 100 dB,
and the top range from 80 to 130 dB.
The automatic range is from 30 to 130 dB.
If one of these ranges is exceeded or undercut, „UNDER" or „OVER" appears on the
display. Switch to the next higher/lower measuring range.
To switch, press the button „LEVEL".
Time rating FAST/SLOW
The signal can be measured with two different measuring intervals.
For rapidly changing sound levels (horn, shot, etc.), you have to set the time rating to
„FAST". The measuring duration is 125 ms/measuring operation.
For slow and persistent sound levels (noise, humming, etc.), the time rating must be
set to „SLOW". The measuring duration is 1 s/measuring operation.
To switch, press the button „FAST/SLOW".

Carrying out a measurement

Wear sufficient hearing protection when measuring loud sound
sources. There is risk of hearing damage!
Observe the permissible ambient temperatures (Technical data) in
order to avoid incorrect measurements.
Calibration
The sound level meter corresponds to the European standard EN 61 672-1 for sound
level meters. To apply the device in line with the standard, it must be calibrated with
the benchmark curve A (dBA) prior to each measuring operation, meaning tested and
if necessary matched with a sound calibrator Class 2 acc. to IEC 60942.
The accuracy must be checked again after each measuring operation.
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