Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1975-12-29
1977-04-19
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324 99D, G01R 120, G01R 1706
Patent
active
040191362
ABSTRACT:
An electrical circuit for digitally displaying an input electrical signal to minimize fluctuations in the output and maximize the speed of response to changes in the input signal whereby the input signal is applied to a first low pass filter and a second low pass filter having both a lower threshold frequency and a slower response time to changes in the input signal than the first filter. The outputs of the two filters are applied to a differential amplifier to produce a differential signal which is applied via a pair of serially and oppositely connected Zener diodes to the output of the second filter, which is also connected to the digital display, to cause rapid response to signal changes. The frequency of a unijunction oscillator is also controlled by the differential signal to increase the measuring rate of the digital display whenever the input signal charges by more than a predetermined value.
REFERENCES:
patent: 2564829 (1951-08-01), Bedford et al.
patent: 3638001 (1972-01-01), Gordon
patent: 3863152 (1975-01-01), Wernitz
Gebr. Hofmann KG
Karlsen Ernest F.
Rolinec Rudolph V.
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