Measurement circuit for load cell

Details Measurement circuit for load cell Measurement circuit for load cell

1986-07-10

1988-03-29

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

73766, 7386263, G01G 314, G01B 716, G01D 304

Patent

active

RE0326313

ABSTRACT:
The strain gauge bridge circuit located in [the] a load cell [of a load cell mass comparator] is modified to provide temperature stability by coupling a remotely located temperature compensating circuit between the two normally connected output ends of strain gauges in adjacent arms of the bridge. The compensating circuit is comprised of a pair of series connected low noise, drift-free precision resistors of relatively low resistance value compared to the resistance of the strain gauges. The precision resistors are shunted by relatively high valued potentiometers which operate to balance the bridge. One potentiometer additionally includes a series connected high value precision resistor for providing fine balance while the other potentiometer is used for coarse balance.

REFERENCES:
patent: 2592009 (1952-04-01), Clement et al.
patent: 3046411 (1962-07-01), Steiner
patent: 3234787 (1966-02-01), Ruge
patent: 3470738 (1969-10-01), Laimins
patent: 4173148 (1979-11-01), Yamada et al.
patent: 4267724 (1981-05-01), Spoor

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