14
2) Switch on the calibrator and check the battery status. The indicator must be lit at all
times during the calibration process. The calibrator generates a tone of 94 dB at 1
kHz.
3) Apply the pressure to free field corrections to the microphone at 1 kHz and the
corresponding ones to the influence of atmospheric pressure, temperature and
humidity in the calibrator. The free field pressure correction of the
P007
microphone is 0.1 dB. That means the DC112d/DC112 should indicate a level of 93.9
dB.
4) Switch the DC112d/DC112 to the numerical screen (
2.2.2), by pressing:
5) Start the measurement:
6) Check that the value of the L
At
function coincides with the value of 94.0 dB with the
corresponding corrections (93.9 dB).
Should the value of the reading differ by more than ±0.3 dB from the calculated value, the
sensitivity of the dosimeter will need to be adjusted If not, the dosimeter is measuring
correctly, and the sensitivity does not need adjusting.
If the testing procedure is not satisfactory contact an official
service, before
adjusting it.
IMPORTANT: The sensitivity of the dosimeter must only be adjusted by authorised,
technically qualified personnel. Readjustment of the sensitivity entails the loss of traceability
in the calibration of the instrument.
To adjust the sensitivity, proceed as follows.
1) Press
to end the measurement process.
2) Do not switch off the CB004 (or CB006) calibrator, and keep it in the calibration
position.
3) Next press
to access the menu of the DC112d/DC112.
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