Measuring apparatus having a sensor located remotely from its el

Details Measuring apparatus having a sensor located remotely from its el Measuring apparatus having a sensor located remotely from its el

1982-06-24

1985-07-30

Groody, James J.

Communications: electrical

Continuously variable indicating

With supply voltage regulation or compensation

324 62, 34087038, 34087042, 34087017, 34087031, G08C 1900, G08C 2502, G08C 1904

Patent

active

045325103

ABSTRACT:
The measuring apparatus comprises a sensor (11) having a first electrical characteristic (balance of inductance) which is directly modifiable by the magnitude of a quantity or characteristic to be measured (e.g. pressure). A remote electrical power supply (27) excites the sensor over first and second conductors (28, 29) of an electrical link (22) having a second electrical characteristic (e.g. resistance) which is capable of disturbing the measurement. A third conductor (21) in the link is connected to a measuring instrument (24).
In order to avoid measurement errors due to leakage currents in the link, the power supply (27) continuously monitors the electrical characteristics of the link and regulates its excitation output as function thereof and in such a manner as to tend to eliminate disturbing effects on the measurement.

REFERENCES:
patent: 3503261 (1970-03-01), Riester
patent: 3530307 (1970-09-01), Evans
patent: 3688187 (1972-08-01), Loos
patent: 3756081 (1973-09-01), Young
patent: 3975719 (1976-08-01), Frick
patent: 4169243 (1979-09-01), Payne et al.
patent: 4390879 (1983-06-01), Kimura

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