Weighing apparatus with improved electromagnetic load compensati

Details Weighing apparatus with improved electromagnetic load compensati Weighing apparatus with improved electromagnetic load compensati

1989-05-19

1989-10-24

Miller, Jr., George H.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

G01G 700

Patent

active

048755346

ABSTRACT:
Weighing apparatus of the load compensation type includes a source of constant current pulses the duration of which is determined by a regulating signal in response to the position of the load receiver relative to the frame, thereby to maintain the load receiver in an initial or zero position during the application thereto of a load to be measured. The regulating circuit includes a PID regulating amplifier that produces a differential signal (D) and a proportional and integral signal (PI). The PI signal controls the operation of a switch that determines the duration of the constant current pulses, and the D signal modulates the amplitude of the constant current from which the pulses are formed. In this manner of using the differential regulating signal component (D), the influence of various deleterious effects on the weighing apparatus, such as vibration, is avoided.

REFERENCES:
patent: 4722409 (1988-02-01), Kunz
patent: 4802541 (1989-02-01), Bator et al.
patent: 4825968 (1989-05-01), Maaz et al.

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