Apparatus for driving a deflecting coil type meter

Details Apparatus for driving a deflecting coil type meter Apparatus for driving a deflecting coil type meter

1979-10-25

1981-09-22

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324146, 324154R, 324166, G01R 1900, G01R 708

Patent

active

042912687

ABSTRACT:
A time-constant circuit is employed for gradually decreasing the voltage of an input signal carrying information to be indicated by a deflecting coil type meter so that the voltage of an input signal applied to the following driving stage does not abruptly drop to zero although the power switch of the driving circuit is turned off. A timer circuit responsive to the power switch energizes a relay or a switching circuit to supply the driving stage with electrical power not only for the time that the power switch is on but also for an additional interval after the power switch is turned off so that the driving stage is capable of being responsive to the gradually decreasing voltage causing the pointer of the meter to return to the zero point.

REFERENCES:
patent: 3602811 (1971-08-01), Fales
patent: 3761731 (1973-09-01), Burgett et al.

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