Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-12-24
1983-05-24
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3102
Patent
active
043852726
ABSTRACT:
A cable checker employs a pair of jacks mounted to a housing and operably associated with an electronic circuit employing a pair of digital logic integrated circuits for both the confirmation and clocking circuitry. In this respect, the integrated circuits comprise a plurality of NAND gates which drive a pair of light emitting diodes, one of which is red to indicate an improperly functioning cable and the other one of which is green to indicate a properly functioning cable. The cable checker further includes an astable multivibrator circuit so as to cause the light emitting diodes to blink thus to save battery power, and the checking of a cable is accomplished simply by plugging the two ends of the cable into the respective jacks associated with the cable checker.
REFERENCES:
patent: 2810881 (1957-10-01), Daily
patent: 2862179 (1958-11-01), Murphy
patent: 3131347 (1964-04-01), Brooks et al.
patent: 3480856 (1969-11-01), Scott
patent: 3986106 (1976-10-01), Shuck et al.
Graham, Logic Circuit Tests Wiring Assemblies, Electronics, Dec. 25, 1975, p. 86.
Pavasi, Jr. et al., ECG Cable Continuity Tester, Medical Instrumentation, May-Jun. 1977, pp. 178 & 179.
Johnson, Go/No-Go Tester Checks Out 16-Wire Ribbon Cable Fast, Electronics, Oct. 13, 1977, p. 108.
Strom, Designing a Simple Flat Cable Tester, Electronic Production, Jan. 1980, pp. 33, 35.
Jacobson Harvey B.
Krawczewicz Stanley T.
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