Impedance meter

Details Impedance meter Impedance meter

1997-05-20

1998-10-06

Do, Diep N.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324654, 324713, 324522, G01R 2708, G01R 2716

Patent

active

058182438

ABSTRACT:
An impedance meter includes a floating type ammeter which measures a voltage across a current detection resistor and determines a current flowing therethrough. A balun eliminates the common mode voltage component in the high frequency range; and a differential amplifier eliminates the common mode voltage component in the low frequency range. The common mode rejection (common mode elimination) effect of the balun and differential amplifier crosses over at a crossover frequency where the impedance of an capacitor and the impedance of the balun are equal. As a result, the impedance meter is capable of measuring a broad range of impedances across a wide range of frequencies, both the low frequency and high frequency range.

REFERENCES:
patent: 4992740 (1991-02-01), Wakasugi
patent: 5019781 (1991-05-01), Tanimoto et al.
patent: 5216373 (1993-06-01), Walamatsu et al.
patent: 5345182 (1994-09-01), Wakamatsu
patent: 5463323 (1995-10-01), Wakamatsu
patent: 5532590 (1996-07-01), Yamanaka

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