The VCM100 is a calibration meter suitable for verifying the calibration of oil test sets. The meter will enable the high voltage output to be checked, traceable to national
standards, and is suitable for all recent laboratory models of Foster oil dielectric strength test sets such as the OTSAF series and the OTS auto and semi automatic series.

The calibration meter fits in the oil test set chamber in place of a standard vessel. The design ensures that the load to the transformer is similar to the load during an oil
dielectric strength test. The voltage indication is viewed on an analogue display marked from 0 to 100 kV with 2 kV divisions. The scale also shows pass tolerance bands to enable a quick assessment of the accuracy to be made. The meter is supplied in a protective bag.
 

Operation
New versions of the OTSAF are programmed with a test sequence suitable for using the VCM100. This sequence
causes the output of the oil test set to ramp up from 0 kV to the maximum voltage value, pausing at each      10 kV point for 10 seconds to allow the calibration to be checked.

Use with individual models of Foster oil test set;
 

1. OTS60
Use either ‘manual’ by setting 10 kV, 20 kV......60 kV in turn or use the slowest ramp rate of 0,5 kV/sec.

2. OTS60 auto
Use either ‘manual’ by setting 10 kV, 20 kV......60 kV in turn or use the ASTM D1816 which ramps slowly at 0,5 kV/sec.

3. OTS60AF
Use either the calibrate option or the ‘Withstand’ (Proof) program by setting 10 kV, 20 kV......60 kV in turn or use the ASTM D1816 which ramps slowly at 0,5 kV/sec.

 

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