High-impedance and wide-band voltage probe for the selective mea

Details High-impedance and wide-band voltage probe for the selective mea High-impedance and wide-band voltage probe for the selective mea

1978-08-15

1980-09-16

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324128, G01R 120, G01R 1500

Patent

active

042232651

ABSTRACT:
A probe adapted for selectively measuring either symmetrical or asymmetrical interference voltages or interference voltages between terminal and ground and utilizing first and second transformers having interconnected primary windings and tightly magnetically coupled secondary windings connectible with the interference measuring set for optionally measuring either symmetrical or asymmetrical voltages or voltages against ground, is disclosed. When measuring a balanced (symmetrical) voltage the terminals of the first transformer primary winding are coupled to the opposite poles of the specimen under test. When measuring an unbalanced (asymmetrical) voltage or a voltage with respect to ground, both terminals of the first transformer winding are connected in common to the pole of the specimen under test. In an cases a single ground terminal of the probe is connected to the ground of the specimen under test.
Measurements of the symmetrical and asymmetrical interference voltages may be taken without removing the probe from the specimen under test by simply connecting the cable from the measuring set to the connectors "sym" or "asym" respectively and by reconnecting the probe to the specimen under test in the manner described above. The circuits under test need not be removed from their operating environment.
The circuit design of the probe permits the conditions for symmetry to be easily and redialy established.

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