Measurement device with common mode current cancellation

Details Measurement device with common mode current cancellation Measurement device with common mode current cancellation

1993-02-26

1995-05-09

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324132, 333 12, G01R 120, H04B 328

Patent

active

054143489

ABSTRACT:
The secondary of a line powered transformer supplies power to a measurement unit. The measurement unit measures between a high test terminal and a low terminal on the secondary. The low terminal is connected to a low test terminal through a common mode current sensor to a device under test. The device under test is also connected to the high test terminal. The common mode current sensor senses current through the transformer capacitance that flows through the device under test to earth ground. A current source is connected in parallel with the low terminal and earth ground. In response to the current sensor, the source dynamically drives a current through the device under test that drives the common mode current to a minimum.

REFERENCES:
patent: 2758286 (1956-08-01), Wible, Jr.
patent: 3243684 (1966-03-01), Ekstrom et al.
patent: 3513334 (1970-05-01), Brunner et al.
patent: 3715673 (1973-02-01), Baum et al.
patent: 4580112 (1986-04-01), Winslow et al.
patent: 5043686 (1991-08-01), Plunkett

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