Apparatus for measuring current and other parameters of an elect

Details Apparatus for measuring current and other parameters of an elect Apparatus for measuring current and other parameters of an elect

1996-03-15

1998-10-06

Brown, Glenn W.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324 7613, 324121R, 324123C, G01R 3102, G01R 130, G01R 1320

Patent

active

058182381

ABSTRACT:
A first terminal of a device-under-measurement (DUM) is connected to the input of a buffer amplifier having its output applied to the inverting input of an operational amplifier through a resistor having the value "aR". A resistor having a value "R" is connected between the inverting input and ground. A second terminal of the DUM is connected to the input of a buffer amplifier having its output connected to the non-inverting input of the operational amplifier through a resistor having the value "ar". The non-inverting input is also connected to the output of a signal generator through a resistor having the value "r". The second terminal is also connected to ground through a load. An oscilloscope is connected across the outputs of the buffer amplifiers, and a computer controls the signal generator in response to a signal from the oscilloscope.

REFERENCES:
patent: 3617881 (1971-11-01), McCormick
patent: 4198598 (1980-04-01), Rheinfelder
patent: 4897599 (1990-01-01), Koslar
patent: 4935692 (1990-06-01), Wakasugi
patent: 5103390 (1992-04-01), Liu
patent: 5319303 (1994-06-01), Yamada
patent: 5578935 (1996-11-01), Burns

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