Optically coupled calibrator for transmitters

Details Optically coupled calibrator for transmitters Optically coupled calibrator for transmitters

1980-05-08

1981-09-22

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

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

G01P 2100

Patent

active

042902975

ABSTRACT:
A calibrator for use in calibrating a two wire DC transmitter includes an oscillator and a light emitter which produce a time varying light signal of known frequency. No physical connection is required between the calibrator and the transmitter, other than a path for the light signal. The transmitter includes a light sensor which is responsive to the presence of the light signal and which produces a time varying calibration signal in response to the light signal. Calibration adjustment circuitry in the transmitter is used to adjust the output of the transmitter when the calibration signal is provided, thereby calibrating the transmitter.

REFERENCES:
patent: 2715717 (1955-08-01), Keithley
patent: 2830191 (1958-04-01), McCollom et al.
patent: 3964020 (1976-06-01), Dickerson
patent: 4119948 (1978-10-01), Ward et al.

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