Measurement circuit for load cell mass comparator

Details Measurement circuit for load cell mass comparator Measurement circuit for load cell mass comparator

1984-03-12

1985-09-17

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

7386267, G01G 314, G01L 122

Patent

active

045414963

ABSTRACT:
The strain gauge bridge circuit located in the 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: 4267724 (1981-05-01), Spoor

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