Meter drive inhibit circuit

Details Meter drive inhibit circuit Meter drive inhibit circuit

1986-11-03

1987-07-14

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324 76R, 324174, G01R 120, G01R 1900

Patent

active

046805419

ABSTRACT:
A meter drive inhibit circuit is provided whereby an erroneous jump of the meter pointer upon system power-up or subsequent microcomputer reset operation is inhibited. A pulse generator is utilized to produce output pulses relating to the rate of rotation of a drive shaft in a typical tachometer application. Such output pulses are provided to a meter drive circuit which in turn provides an output to an electromechanical meter. Such electromechanical meter will display an output related to the time average value of pulses input to the meter drive circuit. An inhibit circuit stage is connected to the meter drive. A microcomputer is utilized to sense the power-up condition of the meter circuit and activate the inhibit stage. When activated, the inhibit stage will prohibit the meter drive from providing an output to the meter and thereby prevent the erroneous jump of the meter pointer upon system power-up.

REFERENCES:
patent: 2754479 (1956-07-01), Swannell
patent: 4008405 (1977-02-01), Neumann et al.
patent: 4158809 (1979-06-01), Dellamano

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