Calibration - testo 816 Bedienungsanleitung

5. Operation 31

5.4 Calibration

The testo 816 sound level meter has already been calibrated in
the factory. In order to check accuracy, recalibration with the
calibrator is recommended particularly if the instrument has not
been used for a long period of time. The testo 816 meter should
also be checked with the calibrator prior to and following
measurements in tough conditions, at great heights, at high air
humidity levels or when particularly high demands are made on
the measurement results.
For calibration purposes, the calibrator is placed with a rotary
motion on the microphone. Switch on the sound level meter and
set it to the measurement range 50-100 dB, time weighting "Fast"
and frequency weighting "A".
The calibrator is then switched on by moving the switch to the
middle position (94 dB). If the sound level meter deviates from the
value shown, it can be readjusted using the adjustment
screwdriver supplied. You can then check whether the second
level of the calibrator is also within the error limit of ± 0.2 dB.
Please note that to do this you must select the corresponding
measurement range (80-130 dB). If the value shown is not within
the error limit, please contact our service department.