Svantek SV 104BIS, Руководство пользователя

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39 SV 104BIS User Manual
Note: It is advised to perform an acoustic calibration of the instrument each time before and after
the measurement run. A single calibration at the start of each day of use is usually sufficient for
most regulations.
Note: The calibration factor is always added to the results in the Dosimeter or 1/1-octave or
1/3-octave analyses modes.
Note:
The manufacturer’s recommended factory calibration interval is every 12 months for this
instrument to be confident in its continuing accuracy and compliance with the international
specifications. Please contact your local SVANTEK distributor for further details.
To calibrate the instrument manually the user has to enter the Calibration menu.
1. Adjust the actual calibration level of the calibrator to be used with the and > keys.
Figure 4-8 Calibration menu
2. Attach the acoustic calibrator SV 34B (or equivalent 114dB@1000Hz) carefully yet tightly over
the microphone of the instrument.
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 104BIS
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 key.
5.
The calibration measurement time is set to 1 second with 3 seconds’ delay. Calibration stops when
either 5 consecutive results will not differ from themselves by more than 0.02 dB or 10 consecutive
results will not differ from themselves by more than 0.05 dB. It is possible to stop the calibration
measurement by pressing two keys at the same time and .
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.