Frequency tuning system with visual display

Details Frequency tuning system with visual display Frequency tuning system with visual display

1976-09-13

1977-08-30

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

324 79R, 324 82, G04D 712

Patent

active

040445976

ABSTRACT:
A visual tuning-aid system for aligning an electronic timepiece to a correct reference frequency is disclosed. A reference oscillator in the system provides a reference signal at a precisely fixed predetermined frequency which is, or is converted to, the correct alignment frequency for the timepiece. A sensor electrostatically detects a time base signal in the timepiece and a bandpass amplifier removes any extraneous signals. The reference signal and the time base signal are provided to a phase shift indicating device of a multiphase motor in the system which provides a visual display, the movement of which is proportional to the rate of phase change between the reference signal and the time base signal. Alignment of the timepiece to the correct frequency stops the phase change and thereupon the visual display stops moving.

REFERENCES:
patent: 1818787 (1931-08-01), Bowman et al.

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