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Operation
The optional OTS/VCM100 calibrator provides the means to carry out a quick calibration check of the
test set high voltage output. The calibrator fits onto the test chamber cradle terminals in place of a test
vessel, and voltage indication is viewed on an analogue meter marked from 0 to 100kV in 2kV divisions
(accuracy 3%).The scale also shows pass tolerance bands to enable a quick assessment of the
accuracy to be made. The design ensures that the load to the test set transformer is similar to the load
during an oil dielectric strength test.
Using the OTS/ VCM100
1.
Place the VCM100 on the cradle terminals at the top of the support horns.
2.
From the main menu select CHECK CALIBRATION. The display will appear similar to figure 24.
3.
If a hard copy of the test results is required, press the centre key marked PRINT to obtain a
calibration check list. This enables the user to manually record the calibrator readings as the test
proceeds. When the printer is in operation, the display shows 'PRINTING PLEASE WAIT'.
4.
On pressing START, the check sequence is initiated. The voltage ramps up from 0kV to the
maximum voltage value, pausing at each 10kV point for a period of 10 seconds. This enables
the oil test set indicated voltage to be verified against the calibrator.
Note:- At any time during a test sequence the right hand control key labelled STOP can be used to
enda test and return to the first screen display.
5.
If required, write down each analogue reading on the print out check list.
6.
Press the right hand key marked MENU to return to the main menu.
26
Calibration Check
Figure 23. OTS/VCM100 Calibrator.
USE OTS/VCM 100
CHECK CALIBRATION
START
PRINT
Figure 23. OTS/VCM100 Calibrator.
MENU
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