Determining contact quality of an impedance meter

Details Determining contact quality of an impedance meter Determining contact quality of an impedance meter

1995-06-14

1997-02-04

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324525, 324715, 340652, G01R 3102

Patent

active

056002491

ABSTRACT:
An impedance meter enables a real value of a component's impedance value to be forced to be negative when contact between measurement terminals and the component is poor. The value of the real part of the measured value is compared with a standard value for judging whether the contact is good or bad. The contact is judged poor when the real part of the measured value is more negative than the standard value. The standard value for judging whether the contact is good or bad is made more negative than the magnitude of the dispersion of the real part of the measured values, and thus erroneous judgments due to dispersion of measured values are eliminated. The circuit that forces the real part of the measured value to become negative is formed as follows: the input of an inverse gain amplifier is connected to the output terminal of a signal generator, the output of the inverse gain amplifier is connected to a high-voltage voltage terminal through a resistance. A resistance is connected between the high-voltage voltage terminal and ground, a resistance is connected between the output terminal of the signal generator and a low-voltage voltage measurement terminal and a further resistance is connected between the low-voltage voltage terminal and a ground terminal.

REFERENCES:
patent: 3866117 (1975-02-01), Erdman
patent: 5336990 (1994-08-01), Maue
patent: 5386188 (1995-01-01), Minneman et al.
patent: 5416470 (1995-05-01), Tanaka et al.
patent: 5489851 (1996-02-01), Heumann et al.
patent: 5491424 (1996-02-01), Asar et al.

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