Measurement circuit suppressing variations in a display using an

Details Measurement circuit suppressing variations in a display using an Measurement circuit suppressing variations in a display using an

1986-06-27

1988-04-12

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

Condition responsive

34087038, 340 57, 324115, 307545, G08C 1904

Patent

active

047377860

ABSTRACT:
A measurement circuit is operative with an electric measurement transmitter, particularly an NTC-resistor (1), and an indicating instrument (3) which has a display which is dependent on a transmitter voltage of the measurement transmitter. The circuit is developed for the suppressing of variations in the display within a middle measurement range. For this purpose, the measurement circuit has a clamping circuit (10-19). The clamping circuit permits the indicating instrument to be acted on within a lower measurement range (up to 80.degree. C.), up to a first limit transmitter voltage by a voltage, which is varied as a function of the transmitter voltage. In a middle measurement range (80.degree. C. to 105.degree. C.) between the first limit transmitter voltage and a second limit transmitter voltage, the clamping circuit feeds the indicating instrument (3) with a constant voltage, which is equal to the voltage present on the indicating instrument at the first limit transmitter voltage. In an upper measurement range (above 105.degree. C.) the clamping circuit permits the indicating instrument (3) to be acted on by a voltage which is varied as a function of the transmitter voltage. In this connection the voltage at the indicating instrument changes suddenly when the second limit transmitter voltage is exceeded (at 105.degree. C.).

REFERENCES:
patent: 3927571 (1975-12-01), Athey
patent: 4575711 (1986-03-01), Suzuki et al.
patent: 4638304 (1987-01-01), Kimura et al.

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