Digital bar graph tachometer

Details Digital bar graph tachometer Digital bar graph tachometer

1978-10-16

1981-01-06

Tokar, Michael J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324161, G01P 348

Patent

active

042439388

ABSTRACT:
In order to provide a tachometer which is accurate and easy to read, a number of light-emitting diodes is arranged in a row, each diode representing a predetermined increment of speed, rotational speed is measured and used to generate pulses, at a proportional rate, which are then decoded and used to drive the light emitting diodes over a predetermined time span, the diodes being lighted repeatedly in sequence at a rate exceeding the response time of the eye so as to present a flicker-free bar graph type display showing rotational speed.

REFERENCES:
patent: 3818495 (1974-06-01), Sagara
patent: 3825827 (1974-07-01), Tumbush
patent: 3866120 (1975-02-01), Ford
patent: 3987392 (1976-10-01), Kugelmann

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