Driving apparatus for cross-coil type analog indicating instrume

Details Driving apparatus for cross-coil type analog indicating instrume Driving apparatus for cross-coil type analog indicating instrume

1992-05-19

1994-05-17

Snow, Walter E.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural active motor elements

324166, G01R 1136, G01P 348

Patent

active

053131550

ABSTRACT:
A driving apparatus used for an analog indicating instrument having a pair of cross coils comprises a pulse signal generating device for generating a pulse signal having a frequency proportional to a quantity to be measured, a frequency-voltage conversion device for generating a ripple voltage proportional to the frequency of the pulse, holding a mean voltage of the ripple voltage as an analog voltage while restraining the ripple, and controlling the analog voltage so as to change following a mean value of the ripple voltage, thereby to supply the analog voltage, and driving devices for supplying a current in accordance with the analog voltage to the cross coils so as to drive these cross coils. The driving apparatus has effects on improving responsibility of frequency-voltage conversion operation in a low frequency region and reducing the deflection of a pointer of an instrument by restraining the ripples.

REFERENCES:
patent: 4988944 (1991-01-01), Ito

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