4. Switch on the calibrator (if the used calibrator doesn’t have auto run function)
and wait approximately 30 seconds for the tone to stabilise before starting
the calibration measurement.
5. Start the calibration measurement by pressing the <Start> key.
The instrument performs series of 1-second consecutive measurements
displaying levels of the measured calibration signal.
If maximal difference between three 1-second consecutive results (Leq(C)) is
less than 0.05dB, the calibration measurement will be stopped, and the
calibration factor calculated. The measurement can be always stopped by the
<Stop> key.
After calibration measurement stop, Calibration Result (measured reference
signal without calibration factor correction) and New Calibration Factor
(difference between the Calibration Level and the Calibration Result, calculated
in dB) are displayed.
6. Press <ENTER> to save the new calibration factor (Enter to Confirm), or press <ESC> to reject it. In both
cases the instrument exits the Calibration by Measurement screen.
It is recommended to repeat the calibration measurement few times. Obtained results should be almost the same
(with 0.1 dB difference). Reasons for unstable results are as follows:
• the calibrator is not properly attached to the instrument,
• there are external acoustic disturbances such as high noise levels close by,
• the calibrator or the measurement channel (the microphone, the preamplifier or the instrument itself) are
damaged.
7. Detach the calibrator from the microphone.
Note: During the calibration measurement, any external disturbances (acoustic noise or vibrations)
should not exceed a value of 100 dB (when using a calibrator that generates a level of 114 dB).
Note: Maximum deviation of the calibration factor cannot exceed +/-1.5 dB. In other case please
contact Svantek service.
3.3.5 Calibration by Measurement (Vibration signal)
Calibration by measurement of the vibration signal can be done in the following
way:
1. Open the Calibr. by Measurement position in the Calibration list.
2. Set the calibration level (Cal. Level) appropriate to the used calibrator. The
default level for calibration in the vibration mode is 10 m/s
2
at 159.2 Hz.
Remember to change this level if using an alternative vibration calibration
signal source.
3. Attach the instrument’s accelerometer to the vibration calibrator using an
appropriate or recommended fixing method.
4. Switch on the calibrator and wait approximately 30 seconds before starting
the calibration measurement.
5. Start the calibration measurement by pressing the <Start> key.
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