Method and apparatus for driving air core meter movements

Details Method and apparatus for driving air core meter movements Method and apparatus for driving air core meter movements

1980-07-10

1982-10-26

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 85, G01R 2300

Patent

active

043564453

ABSTRACT:
Method and circuitry for generating signals in response to an input signal whose frequency or pulse rate is to be measured, which signals are directly applicable to the coils of an air core type meter movement or the like to provide an output indication of the frequency or pulse rate of the input signal. The signals applied to the air core meter are generated directly from the input signal and include sine and cosine signals synchronous with the input signal. A preferred embodiment is disclosed which includes circuitry which produces staircase waveforms, which when integrated, produce the required sine and cosine signals to drive an air core meter movement in response to a periodic input signal.

REFERENCES:
patent: 1076448 (1913-10-01), Pratt
patent: 2532890 (1950-12-01), Castle
patent: 3122704 (1964-02-01), Jones
patent: 3160815 (1964-12-01), Ford et al.
patent: 3344350 (1967-09-01), Stoft
patent: 3502976 (1970-03-01), Chamberlin et al.

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