The instrument IP 630 is used to investigate into the behaviour of isolation of electrical devices, e.g. DCB-ceramic of power semiconductors.

To implement isolation testing, the specimen is connected to an AC voltage source adjustable in a range from 0 up to 5 kV**eff **and the current is measured. Two methods of determining the current flow through the specimen are available. Choosing M1, both measurement contacts are connected to high voltage. Choosing M2, the second contact is connected to ground and the first contact is used to measure the current. These values are compared to the minimum and maximum current limit and the result is implemented via LED lamps.

Exceeding the maximum limit of
2 mA causes the termination of the measurement and indicates an isolation error.

If the actual current is below an adjustable limit a contact error will be indicated and the LED lamp “contact error” will be activated.

The limit values and the measurement duration can be defined and adjusted via serial interface (RS 232).

The test duration for a single section of the measurement is 300 ms minimum.

One terminal of the specimen is connected to ground. The high voltage connection can be shielded. In this case the capacitive current of the wire does not affect the device under test circuit (guarding).