Pulse counting-rate meter

Details Pulse counting-rate meter Pulse counting-rate meter

1974-06-06

1976-10-05

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324 78J, 307235T, G01P 348, G01R 2302

Patent

active

039847730

ABSTRACT:
The disclosed meter comprises a pulse shaper circuit for forming each input pulse into a voltage pulse having a predetermined pulsewidth, a level control circuit connected to the pulse shaper circuit to produce a voltage including a dc component providing a measure of the frequency of the input pulses, and a low-pass filter dc coupled to the level control circuit. The filter consists of a series resistor, a parallel capacitor and a series feedback type operational amplifier to extract the dc component from the voltage from the level control circuit.

REFERENCES:
patent: 3601707 (1971-08-01), Bauer
Abbott, R.W. "Vibration Frequency Monitor", Western Electric Technical Digest No. 7, July 1967, p. 39.

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