Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-12-01
1979-02-13
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 78D, 324 79R, G01R 2314
Patent
active
041398190
ABSTRACT:
The present invention is an improved multifunction frequency counter for use in combination with a crystal oscillator, which includes a crystal and a pair of crystal load capacitors and with a digital display. The improved multifunction frequency counter includes a first frequency divider for dividing the output frequency of the crystal oscillator to one Megahertz and a second frequency divider for dividing the one Megahertz to one thousand Hertz, a three decade down counter, which is preset at 999, and a decode logic element which provides an output signal to an enabling device, a signal gate having its first input coupled to a pulse shaping device which includes an input amplifier electrically coupled to a schmitt trigger, a second input electrically coupled to the enabling device and a third input electrically coupled to the output of the first frequency divider. The signal gate has pulsed output. The improved multifunction frequency counter also includes a six stage decade up counter having a binary coded decimal output which is electrically coupled to the signal gate and a storage latch which is electrically coupled to the binary coded decimal output of the six stage decade up counter. The improved multifunction frequency counter further includes a binary coded decimal to seven segment decoder electrically coupled to the storage latch, a segment driver which is electrically coupled to the digital display and to the binary coded decimal to seven segment decoder.
REFERENCES:
patent: 3673391 (1972-06-01), Lougheed
patent: 3917927 (1975-11-01), Minton
patent: 4020418 (1977-04-01), Barrage
patent: 4057756 (1977-11-01), Leg
Johansen W. Edward
Tokar M.
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