The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 1980
Filed:
Jun. 01, 1978
Henry P Hall, Concord, MA (US);
GenRad, Inc., Concord, MA (US);
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.