Method and apparatus for tone controlled variable sensitivity ti

Details Method and apparatus for tone controlled variable sensitivity ti Method and apparatus for tone controlled variable sensitivity ti

1980-09-30

1983-06-28

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

307140, 340310A, G01R 1508, H04B 354

Patent

active

043908390

ABSTRACT:
A time-of-day watt-hour meter shifts sensitivity whenever the utility transmits an audio tone over the power line to the watt-hour meter. Via an integrated circuit receiver, the tone causes a solid state switch to close, thus increasing the meter sensitivity by increasing the effective number of turns of a voltage coil across the 240 volt line. The effective sensitivity of the meter can be adjusted as desired by varying the duty cycle of the tone transmitted over the power line.

REFERENCES:
patent: 706575 (1902-08-01), Lunt
patent: 1082148 (1913-12-01), Burke
patent: 1138513 (1915-05-01), Stempel
patent: 1996145 (1935-04-01), Chirol
patent: 2415653 (1947-02-01), Ogurkowski
patent: 3683343 (1972-08-01), Feldman et al.
patent: 4082999 (1978-04-01), Staker
patent: 4206405 (1980-06-01), Pentecost

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