Watthour test circuitry

Details Watthour test circuitry Watthour test circuitry

1983-04-06

1986-07-15

Levy, Stewart J.

Electricity: measuring and testing

Testing and calibrating electric meters

G01R 3504

Patent

active

046008810

ABSTRACT:
The present invention accepts accurately generated pulses, having a frequency of K pulses per second, from a suitable source of such pulses, and uses those pulses to phase correct the operation of a phase lock loop voltage controlled oscillator, which is designed to run at a frequency of N times K pulses per second. The output pulses from the voltage controlled oscillator are passed along a bifurcated path. Along one leg of said bifurcated path, the pulses are directed to a counter where they are divided down to provide an output signal at the rate of NK/P pulses per second and in the preferred embodiment, P equals N. The pulses from the counter are fed at the NK/P rate back to a phase comparator which provides an error voltage at the voltage controlled oscillator for each pulse. The present invention further includes logic circuitry which is connected to the second of said bifurcated path legs to receive the pulses which are at the NK pulse per second rate and this logic circuitry is further connected to the output of the counter to receive pulses therefrom at the NK/P pulse per second rate. The logic circuitry is designed to be able to provide pulses at either the NK rate, or at the NK/P rate depending upon how the pulses are to be employed.

REFERENCES:
patent: 2938165 (1960-05-01), Greig
patent: 2957133 (1960-10-01), Burkhart, Jr. et al.
patent: 3217267 (1965-11-01), Loposer
patent: 3931585 (1976-01-01), Barker et al.
Omachi, T. et al., "A Digital Phase Locked Loop . . . ", Electronics and Communications in Japan, vol. 59-A, No. 6, Jun. 1976, pp. 27-36.
Walter, K., et al, "ERROTEST, an Error Calculator for Electricity Meters", Siemens Review, vol. 42, No. 2, Feb. 1975, pp. 58-61.
Gifford, R., "Automatic Tester for kWh Meters", Transmission and Distribution, Jun. 1974, pp. 54-57.
Clarke, J., "Audio Prescaler for Frequency Meters", Electronics Australia, Apr. 1980, pp. 56-58.
K. Walter, "A Digital Error Indicator for Electricity Meter Testing", Siemens Review, XXXIX (1972) No. 11, pp. 508-511.

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