SV 104A USER'S MANUAL_______________________________________________________
35
1. Adjust the actual calibration level of the calibrator to be used with the
<SCROLL>
and
<PROFILE>
keys
Figure 4-8
Calibration menu
2. Attach the acoustic calibrator,
SV 30A
,
SV 31
,
SV 34
,
B&K 4231
(or equivalent 114 dB / 1000 Hz)
carefully yet tightly over the microphone of the instrument. The presence of the calibrator will be
detected automatically
Note: It is also possible to use an electro-mechanical pistonphone, which generates the signal
(ca 124 dB) or different type of acoustic calibrator dedicated for ½” microphones with an alternative output
level such as 94 dB at 1 kHz. In any case, before starting the calibration measurement, the user has to
set the level of the signal generated by the given calibrator (Level position), which is stated in the
calibration certificate of the unit (the default expected value of the Calibration Level set by the manufacturer
of SV 104A is equal to 114 dB).
3. Switch on the calibrator and wait ca 30 seconds for the tone to stabilise before starting the calibration
measurement
4. Start the calibration measurement by pressing the
<ENTER>
key
5. The calibration measurement time is set to 1 second with 3
seconds’ delay and stops until the same
result is obtained 3 consecutive times. It is possible to stop the calibration measurement by pressing
two keys at the same time
<PROFILE>
and <ENTER>
.
Figure 4-9
Calibration - initial delay screen
6. Delay before starting calibration measurement is counted down on the display. After the measurement,
its result is presented on the display.
Figure 4-10
Calibration in progress screen
Note: To quit the calibration procedure without saving the calibration factor press <PROFILE>
and <ENTER>
.
7. It is recommended to repeat the calibration measurement a few times. The obtained results should be
almost the same (with
±0.1 dB difference). The reasons for the unstable results are as follows:
