Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-04-13
1980-07-01
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 725, 324133, 324149, G01R 3102, G01R 1916, G01R 106
Patent
active
042108624
ABSTRACT:
A test device for determining the voltage and/or polarity thereof and the amount of current passing through an electric conductor has two pencil-like probes with electrical contact tips electrically connected together through a plurality of circuit elements. At least one probe has a hollow handle portion in which there is mounted a ceramic cold current limiting resistor connected to the contact tip of one of said probes, a pair of luminescent diodes connected as an antiparallel circuit to the resistor, a keying switch having a movable contact and a first and a second stationary contact. The movable switch contact is connected to the opposite end of the antiparallel diode circuit from the resistor. One stationary contact of the switch is connected to the contact tip of the second probe, while the other stationary contact is connected to the second probe tip through a battery and a protective diode. A guard ring is preferably provided on each probe around its housing to prevent the hand of a user from accidentally slipping down the housing into contact with the contact tip.
REFERENCES:
patent: 2794167 (1957-05-01), Jones
patent: 3870950 (1975-03-01), Laass
patent: 4015201 (1977-03-01), Chaffee
patent: 4028621 (1977-06-01), Bloxam
Todd, A Sub-Ohm Continuity Tester, Electronics World, Feb. 1969, pp. 78-80.
Siemens Aktiengesellschaft
Strecker Gerard R.
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