Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1986-04-11
1987-11-03
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
G01R 1900
Patent
active
047045752
ABSTRACT:
A Hall-effect current clamp, in which the constant-current generator (13) supplying the Hall-effect cell (8) comprises an operational amplifier (15) which has an internal-voltage reference (17) and which pilots a transistor (Q1) mounted in emitter follower in series with the cell (8), such that the current which traverses it is on the order of 1 mA. At the output of the measurement amplifier (14) of the clamp, a dividing bridge (P1,R5) whose intermediate lead is connected to the inverting (-) input of the amplifier (14) permits obtaining a supplementary amplification of the output signal of the clamp at the price of a low current consumption. Thus, the total current consumption of the clamp is maintained at a very low level, thereby providing a considerable increase in the life span of the batteries (9) used to supply the clamp.
REFERENCES:
patent: 3525041 (1970-08-01), Velsink
patent: 4138641 (1979-02-01), Karlin et al.
"A Constant Power Hall-Probe Circuitry for Fast Field Mapping", by Szabits, 6th Int. Conf. on Mag. Tech., pp. 849-853, 9/77.
"S.A.S. 231, An Integrated Hall Effect Circuit with Analog Output" by Tachmann, Siemens AG Components Report, XIV (1979), #6, pp. 225-227.
"Monolithic Hall Cell System", by Bolash et al., IBM Tech. Disc. Bull., vol. 21, #7, 12/78, pp. 2717-2718.
Anton Christian
Arnoux Daniel
Genter Claude
Nascimben Eric
Burns W.
Eisenzopf Reinhard J.
Societe Chauvin Arnoux
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