Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1998-05-19
2000-03-28
Do, Diep N.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324115, 324 725, G01R 19145
Patent
active
060436417
ABSTRACT:
A device for non-contact, non-invasive measurement of current or power in a wire, cable or conductor includes a small coil having multiple turns with a thin ferromagnetic strip. The coil may be secured to a wand or housing adapted to be used to place the coil in close proximity to the wire, cable or conductor, whereby a voltage is induced in the coil. An amplifier and or an analog or digital signal processor is utilized to increase sensitivity. A readout indicates the magnitude of the induced voltage, and a scaling device renders the readout display indicative of the current or power in the wire, cable, or conductor. The readout may comprise a digital display, a series of light emitting devices, an oscilloscope, a digital computer display system, or a flashing light emitting device having a flash rate proportional to the magnitude of the voltage. The device may be constructed in a wand or pen-like fashion, with the coil and strip incorporated into the wand. The device may be combined with a voltage sensor to read out relative voltages.
REFERENCES:
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patent: 4314201 (1982-02-01), Marro et al.
patent: 4321529 (1982-03-01), Simmonds et al.
patent: 4454557 (1984-06-01), Hurley
patent: 4471300 (1984-09-01), Harnden et al.
patent: 4558310 (1985-12-01), McAllise
Libove Joel M.
Singer Jerome R.
Cohen Howard
Do Diep N.
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