Strain gage transducer system with guard circuit

Details Strain gage transducer system with guard circuit Strain gage transducer system with guard circuit

1991-03-15

1992-08-04

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

73862628, 338 2, G01G 314, G01L 122

Patent

active

051350629

ABSTRACT:
A strain gage transducer system, such as a load cell based weighing system, is protected against moisture related errors by an electrically conducting guard circuit for terminals and other parts subject to wet or humid conditions. The guard circuit is connected to an electrical potential close to a potential of signal terminals in a strain gage bridge, for instance to a center tap in a power supply for the strain gage bridge.

REFERENCES:
patent: 3698495 (1972-10-01), Vogt
patent: 4205556 (1980-06-01), Runyan
patent: 4771639 (1988-09-01), Saigusa et al.
patent: 4945762 (1990-08-01), Adamic, Jr.
"IC Op Amp Beats FETs on Input Current," by R. J. Wilder E.E.E. Dec. 1969, pp. AN29-16 through AN29-17.
"New Design Techniques for FET Op Amps," by Robert K. Underwood, Linear Applications Handbook, Mar. 1972, pp. AN63-5 to AN63-7, National Semiconductor, Santa Clara, CA.

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