Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates
Patent
1988-02-17
1989-08-01
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural ranges, scales or registration rates
324 99D, 324114, G01R 1900, G01R 2900
Patent
active
048536199
ABSTRACT:
A digital panel meter adapted for replacement of a standard analog panel meter and designed to selectively receive different ranges of input signals such as AC or DC input signals. The meter circuitry employs an analog-to-digital converter having multiple digits, an input circuit including a range circuit, an operational amplifier and filter circuitry. A relay is tripped for signaling the attaining of a trip point. An audible alarm is provided that may be enabled or disabled and that may be operated in either continuous or short term modes.
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patent: 4641090 (1987-02-01), Danby
patent: 4748404 (1988-05-01), Heinze et al.
"New Concept Hioki Digital Multimeters"; Cat No. 3207 E; 1980; pp. 1-4.
Paulsen Brian
Vignolo Joseph
Eisenzopf Reinhard J.
Nguyen Vinh P.
R. T. Engineering Service Inc.
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