Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-03-09
1985-07-02
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 585B, 1791753F, G01R 2704, G01R 3108
Patent
active
045271135
ABSTRACT:
The invention relates to a method for measuring impulse periods, faults locations and attenuations in cables and light wave conductors. The object is to provide a particularly simple method which can be realized with little expense. The solution basically consists in the fact that each measuring impulse releases a saw-tooth generator, that the time value of the voltage delivered from the saw-tooth generator is compared with an adjustable direct current voltage and serves to open a gate circuit at specific times, that the reflected impulse is compared by a second comparator with a second direct current voltage and that the thus separated signals are led to the gate circuit and displayed by an indicator. The invention will primarily be used in locating faults in light wave conductors under difficult conditions on the construction site.
REFERENCES:
patent: 3853005 (1974-12-01), Schendel
Krawczewicz Stanley T.
Philips Kommunikations Industrie AG
Solis Jose M.
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