Automatic bridge balancing using controllable impedance in chara

Details Automatic bridge balancing using controllable impedance in chara Automatic bridge balancing using controllable impedance in chara

1991-10-04

1994-02-15

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324680, 324706, 324725, G01R 2702

Patent

active

052870650

ABSTRACT:
Automatic bridge balancing apparatus includes a reference impedance and a measuring terminal pair for receiving an unknown impedance. A source of a test signal is coupled to the reference impedance and the measuring terminal pair. A measuring detector is connected in series with the unknown impedance when connected to the measuring terminal pair to provide a measured signal. A reference detector is coupled to the reference impedance to provide a reference signal. A combiner combines the measured signal with the reference signal to provide an error signal. The reference detector includes an up/down counter coupled to a digital attenuator that provides the reference signal. A controller responds to the error signal to control the count in the up/down counter so that the associated digital attenuator provides a signal to the combiner that reduces the error signal so that the count in the up/down counter is characteristic of the unknown impedance.

REFERENCES:
patent: 3562641 (1971-02-01), Fulks
patent: 3766469 (1973-10-01), Nakane
patent: 4772844 (1988-09-01), Andeen et al.
patent: 4841228 (1989-06-01), Noguchi et al.
patent: 5113140 (1992-05-01), So
patent: 5189362 (1993-02-01), Doble

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