Calibrators

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About the product

ICM series Accessories: Calibrators

Partial discharge measurement is a useful tool to analyze the insulation of high voltage components. However, partial discharges can usually not be measured directly, just the apparent charge of such signals are captured by the measuring instrument. Therefore a calibration of the whole measuring system is required in principle. Hereby short-duration current pulses of known charge magnitude are injected into the system, and by this a scale factor can be calculated for later PD measurements.

Power Diagnostix offers a wide range of calibration charge injectors suitable for use in calibrating partial discharge measurements. The appropriate choice of a calibration instrument depends on the range of typical charge values of the PDs being measured. Calibrators can also be used for time domain reflectometry in cables to determine cable length and location of joints.

Troubleshooting

The calibration pulse is not visible on the display of the measuring instrument

First check that the calibrator is still on. The calibrator will shut off automatically after about 15 minutes without having one of its buttons pushed. Check that the low battery indicator is not visible on the LCD of the calibrator.
The calibration pulse setting might be too weak for the test setup. Try increasing the magnitude of the calibration impulse applied to the test setup.
Sometimes the calibration pulse is lost if the high voltage power supply is connected to the test setup when the calibration is performed, even if the high voltage supply is completely powered off. Ensure that the power supply is not earthed during calibration. Try physically disconnecting the high voltage supply from the test object during the calibration process. The calibrator is then only connected via the quadrupole of the test object and the coupling capacitor (if present).

The battery of my calibrator is low/empty? How do I change it?

Power Diagnostix’s calibration impulse generators are equipped with long-life lithium batteries that ensure an operation time up to 200 hours. Just in case you need to replace the battery anyway, Power Diagnostix has prepared an instruction document for the battery change. Please refer to the “User guides and documents“ section below.