Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-05-17
1977-08-02
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 86, 324108, 324133, G01R 1914, G01R 3102
Patent
active
040399370
ABSTRACT:
A local power source, such as a battery, is connected to a tone generator oscillator circuit which includes an audio reproducer. The tone generator includes a voltage sensing element such as a dark-resistance photoconductor, a resistor, or a Zener diode, at which the voltage is sensed when connected in a phase sequence circuit network or other network to be tested. The output tone, whether present or not, is indicative of a predetermined phase sequence of connection of test terminals. A transfer switch can connect the oscillator directly or through dropping resistors or non-linear resistances such as a Zener diode to the test terimals so that the test terminals can also be used to test for external resistance, short circuits, or polarity of applied voltages in the network which, depending on their polarity, may introduce external voltages, thus modifying the tone of oscillation of the tone generator. The output of the tone generator thus will be indicative of input conditions at the test terminals for universal measurement of phase sequence, input resistance, continuity at input terminals, or applied voltages and their characteristics, namely whether a-c or d-c, and if so, their polarity.
REFERENCES:
patent: 2130573 (1938-09-01), Wideroe
patent: 2566726 (1951-09-01), Huse et al.
patent: 2634404 (1953-04-01), Carmichael
patent: 2993172 (1961-07-01), Karlicek
patent: 2999231 (1961-09-01), Kusters et al.
patent: 3492567 (1970-01-01), Rissolo
patent: 3764904 (1973-10-01), Drexler
patent: 3872384 (1975-03-01), Laass
patent: 3947759 (1976-03-01), Briggs
Stubbings, G. W., A Modified Varley Phase Sequence Test Instruments, Feb. 1934, p. 27.
Wider, M. F., Shows Phase Rotation of Secondary Circuits Electrical World, July 6, 1946, pp. 106 and 110.
Strecker Gerard R.
Taco-Tafel GmbH & Co., KG
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