ISO 8041-1:2017 standard advises users to perform in-situ checks of measuring
instruments. Checking should be carried out immediately before and after the
measurement.
1. Select System Check in the Calibration sub-list and press <ENTER>.
2. Set the reference calibration level (Cal. Level) – see Appendix C,
Chapter C.1, par. Calibration.
3. Attach the sound calibrator to the instrument’s microphone or accelerometer
to the vibration calibrator.
4. Switch on the calibrator and wait approximately 30 seconds before starting
the system check measurement.
5. Start the calibration measurement with the <Start/Stop> key.
The measurement starts without delay. If maximal difference between three 1-
second consecutive results (Leq(C)) is less than 0.05dB, the measurement will
be stopped. Otherwise the user should stop it manually.
During the system check measurement, the <ESC> and <Pause> keys do not
operate but it is possible to stop the measurement using the <Start/Stop> key.
System check is considered as successful if its result (Cal. Result) does not
differ from the calibration level by more than 0.5 dB.
If system check measurement shows bigger difference than 0.5 dB you should
perform Calibration by Measurement.
6. Press <ENTER> to exit System Check.
Note: It is advised to perform the system check of the instrument each time before the measurements
begin. If system check gives negative result, then it is necessary to perform calibration.
4.3.2 Calibration by Sensitivity (Acoustic signal)
Calibration on the base of the microphone’s
published sensitivity information can be
performed the following way:
1. Select the Calibr. by Sensitivity position
in the Calibration list and press
<ENTER>.
2. Set the Sensitivity of the microphone
taken from its calibration certificate using
the ◄ / ► key and then press <ENTER>.
The calibration factor (Cal. Factor) is
calculated every time after pressing the ◄
/ ► key, in relation to the nominal value of
35.00 mV/Pa.
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