29
SVANTEK 977W User Manual
For an accelerometer with sensitivity higher than 10.0 mV / ms
-2
the calibration
factor will always be negative.
For an accelerometer with sensitivity lower than 10.0 mV / ms
-2
the calibration
factor will always be positive.
The lowest available value of the sensitivity that can be introduced is equal to
10.0
µV / ms
-2
(it conforms to the calibration factor equal to 60.0 dB) and the
highest value is equal to 10.0 V / ms
-2
(calibration factor is equal to -60.0 dB).
4.3.4.
Calibration By Measurement in case of Acoustic signal
Calibration by measurement for the sound 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.
3. Attach the acoustic calibrator SV 30A
(or equivalent
114 dB / 1000 Hz
)
carefully over the microphone of the instrument.
Note: It is also possible to use an electro-mechanical pistonphone, which generates a signal (ca
124
dB) or different type of acoustic calibrator dedicated for ½” microphones. In any case, before
starting the calibration measurement, the user has to set the level of the signal generated by the given
calibrator (Cal. Level position of Calibr. by Measurement sub-list), which is stated in the calibration
certificate of the unit (the value of the Cal. Level set by the manufacturer of SVAN 977W is equal to
114 dB). It is also necessary to switch the instrument Range to the High level setting.
4. Switch on the calibrator and wait approximately 30 seconds for the tone to
stabilise before starting the calibration measurement.
5. Start the calibration measurement by pressing the
<Start/Stop>
push-button.
The calibration delay time is set to 3 seconds
Waiting for the start of the measurement the
Delay
is counted down on the display. After
the end of the measurement, the result is
displayed
in
the
bottom
line.
The
measurement is running until the user
presses the
<Start/Stop>
push-button.
….
6. Press the
<ENTER>
push-button to
accept the calibration measurement
result, or
<Esc>
to exit without saving.
The calibration factor is calculated, stored
and displayed (cf. next Figure) after pressing
the
<ENTER>
push-button and confirmation
(
Are you sure? Yes
).
<ENT>
