Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-04-04
1981-03-17
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
340715, 364707, G01R 2302
Patent
active
042570034
ABSTRACT:
This disclosure relates to a wide range frequency counter which functions as a highly accurate four range portable frequency counter. Accurate timing intervals of the frequency counter are obtained from a crystal controlled clock oscillator preferably operating at 5.24288 Mhz installed in a temperature controlled oven operating preferably at 65 degrees C. A seven figure LED digital display is used as the visual readout. The first "on" position of a range selector switch consists of a basic 5 Mhz counter which can count from less than 20 hertz to 5 Mhz. The basic counter is used with several combinations of integrated circuit (IC) prescalers to provide three other full-scale counting ranges. The frequency counter uses rechargeable batteries and has current-saving features to allow a useful operation period of six hours in the portable internally powered mode. A self-contained rectifier/voltage regulator combination not only allows the batteries to be recharged but also permits the frequency counter to be operated as a bench unit from an external transformer which is plugged into an AC power outlet.
REFERENCES:
patent: 3548403 (1970-12-01), Johnson
patent: 3769583 (1973-10-01), Spencer
patent: 3773038 (1973-11-01), Smith
patent: 3928960 (1975-12-01), Reese
Robert L. Allen, Frequency Divider Extends Automatic Digital Frequency Measurement to 12.4 Ghz., Apr. 1967, pp. 2-7, Hewlett-Packard J.
Hewlett-Packard Catalog, 1975, Electronic Instruments and Systems, Electronic Counters, 5300 Measuring System, pp. 270-271.
Ma-West, Inc.
Tokar Michael J.
Weiss Harry M.
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