Arrangement for indicating revolutional speed of a revolving bod

Details Arrangement for indicating revolutional speed of a revolving bod Arrangement for indicating revolutional speed of a revolving bod

1977-12-23

1980-01-15

Rolinec, Rudolph V.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

32479D, G01P 348, G01R 2314

Patent

active

041841140

ABSTRACT:
A revolution speed indicator arrangement is provided which includes a reference frequency oscillator, a tachogenerator for generating a frequency associated with a revolutional speed of the revolving body, difference frequency deriving circuitry interconnected to the reference frequency oscillator and the tachogenerator for deriving a difference frequency between the frequency associated with the revolutional speed and the reference frequency, and an indicator unit responsive to the difference frequency deriving circuitry for visually indicating the difference frequency. The arrangement may be provided with a coincidence determining unit responsive to the difference frequency for detecting coincidence between the frequency associated with the revolutional speed and the reference frequency, and the indicator unit is connected to the coincidence detecting unit to visually indicate the coincidence.

REFERENCES:
patent: 4041832 (1977-08-01), Risch
Hellar, Jr.; "Precision Speed Measurement. . .";General _ Electric Review; Oct. 1949; pp. 22-24, 26.
Zimmerman, R. H.; "Measuring Frequency Deviation"; Electronic _Industries; Jun. 1965; pp. 100, 101, 107. _
Clapp, C; "Beat Frequency Indicator . . ."; Electronic _Engineering; Feb. 1977; p. 19. _

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