VOLTCRAFT SL-400 Bedienungsanleitung Seite 31

Proceed as follows for calibration:
• Switch the sound level meter on.
• Select the corresponding settings (dBA, measuring range up to 100 dB or higher
and FAST time rating).
• If necessary, deactivate the the functions „MAX" and „HOLD".
• Plug the microphone of the sound level meter into the opening of the sound cali-
brator. Ensure a tight fit so that the calibration chamber in the sound calibrator is
sealed.
• Set the following parameters on the sound calibrator: 94dB at 1 kHz
• The measuring device should now show a sound level of 94dBA. If this is not the
case, the measuring device must be calibrated.
• With the enclosed screwdriver, carefully turn the calibration point on the side (CAL
calibration potentiometer 17) until the value on the display is exactly 94.0 dBA.
• The measuring device is ready for use.
Making measurements
You should always measure a sound source directly and at a distance of 1m.
Make sure that there are no objects or persons between the microphone
and the sound source.
Point the sound level meter with the microphone directly on the sound source.
In order to not influence the soundwaves, keep the measuring as far away from your
body as possible at your outstretched arm or attach it to the enclosed tripod. If pos-
sible, move approx. 2m away from the measuring spot. If necessary use the micro-
phone extension cable supplied. Connect (screw) the extension cable between the
microphone and the measuring device There is a tripod thread (12) on the back of
the casing.
Avoid vibrations or movements.
In case of wind (>10m/s), use the enclosed wind protector to not falsify
the measuring value with the wind noise. The wind protector does not
falsify the measuring value.
For easier legibility at dusk or dark, you can illuminate the display. Press the button
with the lamp symbol (5) for this purpose. To turn off press this button again.
Turn the display illumination and/or the measuring device off when not in use.
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