Digital phase and frequency meter

Details Digital phase and frequency meter Digital phase and frequency meter

1976-10-14

1978-01-24

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 83D, 324 79D, G01R 2302

Patent

active

040706184

ABSTRACT:
Phases are measured with a resolution of one degree, and frequencies are measured with a resolution of 0.01 Hz by the same circuitry. An internal voltage-controlled oscillator (VCO) is forced to operate at 360 times the frequency of the incoming test signal by use of a phase-locked loop and a 360 divider. Clock pulses from the VCO are counted throughout an interval of noncoincidence of the original test signal and any phase-shifted version of that test signal, and the count is digitally displayed directly as phase shift in degrees. Clock pulses from the VCO are counted throughout an interval of (1/3.6) second and the resulting count is digitally displayed with the last two digits marked off by a decimal point, as the frequency.

REFERENCES:
patent: 4014242 (1977-03-01), Sanderson

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