GR 1657 RLC Digibridge

© Brooke Clarke 2019

GR 1657 RLC
GR 1657 RLC



I'm been curious about these for some time, but prior to now they were too pricey.  This is related to my interest in impedance, RLC Bridges and LCR meters.



Fig 1
GR 1657 RLC

Fig 2
GR 1657 RLC


3562641 Impedance-measuring transformer bridge with automatic digital balancing circuit, Robert G FulksGeneral Radio Co, 1971-02-09,

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4181949 Method of and apparatus for phase-sensitive detection, Henry P. Hall, GenRad Inc, 1980-01-01 - half wave long samples at 0, 405 and 810 degrees.

4196475 Method of and apparatus for automatic measurement of impedance or other parameters with microprocessor calculation techniques, Henry P. Hall, GenRad Inc, 1980-04-01 - GR 1657

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4242631 Front-end circuit apparatus for impedance measurements and the like,  Henry P. Hall, GenRad Inc, 1980-12-30 - GR1657-RLC "Digibridge"
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US4546441A *1982-07-22  1985-10-08  John Burch  Method and apparatus for time based measurement of impedance
US4808914A *1985-10-17  1989-02-28  Harris Corporation  Resistance measuring ohms converter circuit employing a constant current source
DE3812633A1 *1988-04-15  1989-10-26  Daimler Benz Ag  A method for contactless resistance measurement
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Marconi TF-2700 Universal Bridge

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ZM-11/U Capactance-Inductance-Resistance Bridge, line powered
ZM4 Bridge battery powered
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GenRad 1657 RLC Digibridge -


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