Weighing apparatus including linearized electromagnetic compensa

Details Weighing apparatus including linearized electromagnetic compensa Weighing apparatus including linearized electromagnetic compensa

1976-05-14

1977-12-13

Miller, Jr., George H.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177210C, G01G 700, G01G 314

Patent

active

040624170

ABSTRACT:
Improved weighing apparatus of the electromagnetic type is disclosed including linearizing means for controlling the operation of either the compensating means or the indicating means of the system to effect linearization of the load indication over the weighing range, whereby the effect of the compensating coil magnetic field on the main magnetic field of the instrument is eliminated. In the preferred embodiment, smoothing capacitor means are connected with the reference voltage input terminal of the voltage-to-current converter of the constant current source, switch means being operable to control the charging and discharging of the smoothing capacitor means in accordance with the time periods during which compensating current is periodically supplied to the compensating coil means. In an alternate embodiment, the linearization means are provided within the internal structure of digital voltmeter means, and in a further embodiment, the linearization means includes an analog multiplier connected between the digital voltmeter means and the measuring resistor across which the compensation current to the coil is measured.

REFERENCES:
patent: 3133606 (1964-05-01), Thomson
patent: 3604525 (1971-09-01), Blethen et al.
patent: 3688854 (1972-09-01), Strobel
patent: 3816156 (1974-06-01), Baumann
patent: 3955638 (1976-05-01), Wasko
patent: 3968850 (1976-07-01), Gaskill

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