Front-end circuit apparatus for impedance measurements and the l

Details Front-end circuit apparatus for impedance measurements and the l Front-end circuit apparatus for impedance measurements and the l

1978-06-01

1980-12-30

Karlsen, Ernest F.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 57R, 324 61R, 324DIG1, G01R 2702, G01R 2700

Patent

active

042426316

ABSTRACT:
This disclosure is concerned with a novel front-end circuit for impedance measuring circuits and the like, involving separately or alternately operated grounding switches for connecting the free terminals of unknown and standard impedances, series-connected at a common terminal, to ground, for enabling separate selected voltage measurements between the unknown and standard, and with the series-connected impedances fed from a floating transformer; the circuit avoiding errors due to low switch impedances and obviating dependence upon capacitance from either side of the unknown impedance to ground and upon the series impedance involved in connections or leads to the unknown impedance.

REFERENCES:
patent: 2479051 (1949-08-01), Sunstein
patent: 2589758 (1952-03-01), Wojciechowski
patent: 2593175 (1952-04-01), Packard et al.
patent: 3027511 (1962-03-01), Farr
patent: 3031614 (1962-04-01), Calvert
patent: 3422347 (1969-01-01), Cox
patent: 3585496 (1971-06-01), Ichijo
patent: 3718856 (1973-02-01), Hendriks
patent: 3784906 (1974-01-01), Ironside
patent: 3786350 (1974-01-01), Munt
patent: 3873917 (1975-03-01), Kreuzer
Bode, H. W., "Network Analysis and Feedback Analysis Design"; Van Nostrand; 1945, p. 223.
GR1657-RLC "Digibridge" Instruction Manual; Gen-Rad Inc.; Jan. 1978.
Gipe et al; "Microprocessor Simplifies Impedance Measurements"; Wescon/76; Session 1; Paper 4.

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