Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-11-07
1980-06-10
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324133, G01R 3102, G01R 1916, G01R 1512
Patent
active
042075173
ABSTRACT:
A self-contained hand-held portable pocket probe for trouble shooting direct current electrical systems. The probe includes an electrically conductive probe, a ground terminal, and first and second electrical circuits connected in parallel between the probe and ground terminal. The first electrical circuit includes an illumination device, a rectifying device, and a device for limiting current flow through the illumination device. The first electrical circuit normally enables positive current flow only in the direction from the probe to the ground terminal. The second electrical circuit normally allows current flow in a direction from the ground terminal to the probe and includes an illumination device, a rectifying device and a battery. The probe is designed for use with direct current systems having maximum test voltages in the range of 6-24 volts and for measurement of low impedance grounds.
REFERENCES:
patent: 2794167 (1957-05-01), Jones
patent: 2851659 (1958-09-01), Ladrick
patent: 3870950 (1975-03-01), Laass
patent: 3934195 (1976-01-01), Shires
patent: 3962630 (1976-06-01), Chaffee
patent: 3967257 (1976-06-01), Hager
patent: 4007418 (1977-02-01), Hanna
patent: 4011508 (1977-03-01), Gabor
Todd, A Sub-Ohm Continuity Tester, Electronics World, Feb. 1969, pp. 78-80.
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