Making Measurements - VOLTCRAFT SL-100 Bedienungsanleitung

The time evaluation must be set to „SLOW" for constant sound lev-
els and sound levels that change slowly (white noise, hums, etc.).
Press the „F/S" button to switch between ranges.

Making measurements

Make sure you have suitable ear protection for
loud sound sources. There is risk of an damage to
the ears!
Observe the permissible ambient temperatures
(Techn. Data) to avoid faulty measurements.
Calibration
This sound level detector complies with the European Standard EN
60 651 for sound level meters. To be able to use it in compliance to
the standards, the meter must be calibrated before every measure-
ment using evaluation curve A (dBA) i.e. it must be checked using
an optional sound calibrator and adjusted as required.
Accuracy must once more be checked after each measurement.
To calibrate, proceed as follows:
• Switch the sound level detector on.
• Select the appropriate settings (dBA, Hi or Lo measurement
range and FAST time evaluation)
• If required, deactivate the „MAX" and „HOLD" functions.
• Plug the microphone of the sound level detector into the opening
of the sound calibrator. Make sure that it sits tightly to ensure that
the calibration chamber in the sound calibrator is sealed.
• Set the following parameters at the sound calibrator:
94 dB at 1 kHz
• The meter should now display a sound level of 94 dBA. If this is
not the case then the meter must be adjusted.
24
• Open the battery compartment at the rear of the device and
remove the battery. Do not disconnect the battery!
• You can now see two alignment points in the battery compart-
ment.
• Using a suitable screwdriver, carefully turn the adjustor for your
measurement range until the display is set to exactly 94.0 dBA.
A(Lo) = Calibration controller for the Lo measurement range
A(Hi) = Calibration controller for the Hi measurement range
• Carefully re-close the battery compartment.
Making measurements
Sound sources must always be measured directly.
Make sure that there are no objects or persons located
between the microphone and the sound source.
Point the sound level detector and the microphone directly at the
sound source.
To ensure that you do not influence the sound waves yourself,
stretch the meter out with your arm as far away from your body as
possible or mount the meter onto a stand. There is a fixture for a
stand on the rear of the housing.
Avoid vibration and movement.
If there is a wind (>10 m/s) then use the windshield to
ensure that the measurement is not invalidated by wind
noise. The windshield does not interfere with measure-
ments.
25