LDC Hook-on digital ammeter

Details LDC Hook-on digital ammeter LDC Hook-on digital ammeter

1981-07-24

1984-09-11

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324 96, 324122, G01R 120, G01R 1500

Patent

active

044713002

ABSTRACT:
A low cost hook-on ammeter for consumer use includes a split core to be clipped around a conductor. Secondary turns on the core actuate a liquid crystal digital display to indicate alternating current amplitude in the conductor. The liquid crystal display segments may be connected to individual taps on the secondary winding, or to taps on a resistive divider network connected across the entire secondary winding. As current in the conductor increases, secondary voltage increases, turning on an increasing number of segments of the liquid crystal display accordingly.

REFERENCES:
patent: 2146555 (1939-02-01), Arey
patent: 4060801 (1977-11-01), Stein et al.
patent: 4212011 (1980-07-01), Waldron
patent: 4301407 (1981-11-01), Koslar
"GE Test Instruments" brochure GEP-372-F, June 30, 1980, pp. 1 and 2.
"General Electric Snapper Slim" brochure GEA-10658 12-79, pp. 1 and 2.
"GE Types 1904, 1905 Hook-On Ammeter-Voltmeter" brochure ID-4810, pp. 1-3 and 7.

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