30
SVANTEK 977W User Manual
It is recommended to repeat the calibration measurement a few times to ensure the integrity of the calibration.
The obtained results should be almost identical (with ±0.1 dB difference). Some possible 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.
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).
4.3.5. Calibration By Measurement in case of Vibration signal
Calibration by measurement for the vibration measurements can be done in the
following way:
1.
Select
the
calibration
by
measurement
(highlight
the
Calibr. by Measurement
text) from the
Calibration
sub-list and press the
<ENTER>
push-button.
2.
Set the calibration 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/Stop>
push-
button.
The calibration measurement starts after
3 second delay. Waiting for the calibration
measurement the
Delay
is counted down on the
display. The measurement lasts 5 second. After
the end of the measurement, its result is
displayed in the bottom line.
….
6. Press
<ENTER>
to
accept
the
measurement result, or
<Esc>
to exit
without saving.
The calibration factor is calculated, stored
and displayed after pressing the
<ENTER>
push-button and confirmation (
Are you
sure? Yes
).
<ENT>
It is recommended to repeat the calibration measurement a few times to ensure the integrity of the calibration.
The obtained results should be almost identical (with ±0.1 dB difference). Some possible reasons for unstable
results are as follows:
the accelerometer is not properly attached to the calibrator,
there are external disturbances,
the calibrator or the measurement channel (the accelerometer or the instrument itself) are damaged.
