Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-01-16
1979-08-07
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 60C, 324 62, 324 72, 324 73R, 324133, 324158D, 324158T, G01R 2700
Patent
active
041639375
ABSTRACT:
An acoustic output electrical tester has externally accessible test terminals and internal test switches. The tester includes a multivibrator circuit which provides an output tone, the pitch of the tone, and its presence or absence, providing an indication with respect to the impedance, or transistor being tested. The externally accessible terminals can be selectively connected to a transistor, with the switching function replacing the externally connected transistor in the circuit of the multivibrator. A conductivity type reversal switch is provided to place the externally connected transistor in an internal circuit appropriate to the two conductivity types of the transistor. A multi-function testing circuit is also provided having a resistance standard circuit and a reactive impedance standard circuit with an impedance-resistance selector switch and a test-standard transfer switch to selectively connect switch terminals to the externally accessible terminals or to the respective internal standard, so that a comparison of the pitch of oscillation of the tone generator can be used to match impedances, the value of which is indicated, for example, on a scale of the tester to an externally connected impedance.
REFERENCES:
patent: 3872384 (1975-03-01), Laass
patent: 4080562 (1978-03-01), Rubel et al.
Reay, Simple Transistor Tester, Radio & Electronics Constructor, Jun. 1976, pp. 688, 689.
Stoner, Semiconductors, C Q, Mar. 1960, pp. 78, 79.
Krawczewicz Stanley T.
TACO-Tafel GmbH
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