4.3.7 Erasing calibration records - Clear Calibr. History
You can erase all calibration records. To do this, choose the
Clear Calibr. History position in the Calibration list and press <ENTER> to
perform this operation.
The instrument will request the confirmation of this operation.
After erasing calibration records, the Calibration History screen will not contain
any previous calibration records. The content of this screen is also cleared after
the Factory Settings operation (path: <Menu> / Auxiliary Setup).
Note: Acoustic and vibration calibration histories are independent files in the internal instrument’s
memory and erasing the calibration history in one mode does not erase it in another mode.
4.3.8 Automatic calibration – Auto Calibration
Automatic calibration feature enables
calibration of the microphone input as easy as
possible with minimum steps.
If the automatic calibration is switched on, the
instrument, when it doesn’t perform the
measurement, periodically compares the
measured signal level (Running SPL for 1
second) with the reference calibration level
and starts the calibration measurement if the
stable SPL result is within ±5dB of the
calibration level.
To perform the automatic microphone calibration, follow next steps:
1. Switch on the instrument.
2. Attach the SV 36 (or equivalent 114 dB@1000 Hz) calibrator to the microphone and switch it on (if the used
calibrator doesn’t have automatic switch-on feature).
Generated by the calibrator sound pressure level starts the Automatic
Calibration process if the difference between the Calibration Level value set
up in the Calibration By Measurement screen and the measured calibrator
SPL level is in the range ±5dB.
During the calibration measurement, the level of the measured calibration signal
will be displayed. If the maximal difference between three 1-second consecutive
Leq results is less than 0.05dB, the calibration measurement will be finished.
The measurement can be always stopped by the <Start/Stop> key.
After calibration measurement stop, the Calibration Result (the measured
reference signal without calibration factor correction) and the
New Calibration Factor (difference between the Calibration Level and the
Calibration Result, calculated in dB) are displayed.
3. Press <ENTER> to save the new calibration factor (Enter to Confirm),
press <ESC> to reject it. In both cases the instrument exits the Calibration
by Measurement screen.
4. Detach the calibrator from the microphone.
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