Self-calibrating automatic zeroing strain gauge circuit

Details Self-calibrating automatic zeroing strain gauge circuit Self-calibrating automatic zeroing strain gauge circuit

1979-08-01

1980-07-22

Gill, James J.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

73769, 73726, 324130, G01L 904, G01L 2700

Patent

active

042133483

ABSTRACT:
A method of and apparatus for calibrating and providing an output from a strain gauge (1) is described. In the method and apparatus there is provided a constant-current source (10). Coupled to the current source (10) is an amplifier (12,13) for providing an output corresponding to the difference between the voltage drop across the strain gauge (1) and a reference voltage from a source (14). The reference voltage is used to adjust the current in the strain gauge (1) from the current source (10). After the current is adjusted, further changes in the voltage drop in the strain gauge (1) relative to the reference voltage is used for providing an output of the voltage difference relative to the reference voltage. The adjusting of the magnitude of the current from the constant-current source (10) is provided by a calibrate-and-zero sample and hold circuit (16) having a sample and hold period sufficient to reduce to negligible levels the effects of the dielectric absorption of an associated capacitive means (20).

REFERENCES:
patent: 3894535 (1975-07-01), Cannon et al.
patent: 4041382 (1977-08-01), Washburn

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