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27
SV106A User Manual
For the sensitivity of the accelerometer lower than 10.0 mV / ms
-2
the
calibration factor will always be positive.
The lowest applicable value of the sensitivity to be introduced is equal to
10.0
V / ms
-2
(it conforms to the calibration factor equal to 60.0 dB) and
the highest one is equal to 10.0 V / ms
-2
(calibration factor equal to -
60.0 dB).
3. Press
<ENTER>
to save the selected calibration factor. Press
<ESC>
to return to the
Calibration
sub-list
without saving any changes made in this window.
4.2.5.
Calibration by measurement
– Calibr. By Measurement
Calibration by actual measurements can be done in the following way:
1. Select the
Calibr. By Measurement
position from the
Calibration
sub-
list and press
<ENTER>
.
2. Select required filter: for hand-arm
transducer
–
BL Wh
, for whole-body
transducer
–
BL Wk
or equivalent.
<
>
3. Select the calibrator signal level.
4.
Attach the instrument’s accelerometer to the vibration calibrator.
5. Switch on the calibrator and wait approximately 30 seconds before
starting the calibration measurement.
6. Start the calibration measurement by pressing the
<Start/Stop>
push-
button.
The measurement starts after 5
seconds’
delay. The calibration measurement time
is also predefined to 5 seconds. During
calibration, the
<ESC>
and
<Pause>
push-buttons do not operate but it is
possible to stop the measurement using
the
<Start/Stop>
push-button. Waiting for
the calibration measurement to begin, a
Delay
is counted down.
It is recommended to repeat the calibration measurement 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.