Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-12-18
1977-06-07
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 725, 324133, G01R 3102, G01R 1914, G01R 3128
Patent
active
040286215
ABSTRACT:
An improved electronic DC test probe particularly suitable for rapidly and flexibly trouble shooting automotive electrical systems. The test probe features highly reliable electronic circuits energized from an automotive battery through a pair of connector members suitable for connection to the terminals of the battery. A conductive test prod and a pair of indicator lamps are housed within a hand-held probe housing and enable an operator to rapidly trouble shoot the entire electrical system without alteration of any kind to the battery terminal connections. Electronic reference voltage establishing circuits protect the probe circuits and extend the operative life of the indicator lamps. The normally extinguished indicator lamps are illuminated only during actual test measurements with an intensity that varies proportionately with the measured signal. In one embodiment of the invention a single conductor extends from the probe chassis to a common terminal adjacent the connector members at the battery terminals. Another embodiment includes twin-beam lamps within the probe housing, enabling the probe to double as a trouble light.
REFERENCES:
patent: 2229927 (1941-01-01), Kamper
patent: 3157870 (1964-11-01), Marino et al.
patent: 3259754 (1966-07-01), Matheson
patent: 3281692 (1966-10-01), Beroset
patent: 3437916 (1969-04-01), Mazurkevics
patent: 3543154 (1970-11-01), Gordon
patent: 3600678 (1971-08-01), Garrett
patent: 3619775 (1971-11-01), Naylor et al.
patent: 3806803 (1974-04-01), Hall
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