Weighing apparatus with vibratory string force sensor

Weighing scales – Self-positioning – Electrical current generating or modifying

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G01G 314

Patent

active

052320634

ABSTRACT:
A weighing scale includes a vibratory string force measuring device (1) the frequency of which varies as a function of the applied load. The load signal from the vibratory string device is supplied to a microprocessor (8) where it is processed with a first frequency signal supplied by a temperature-responsive first quartz oscillator (9), thereby to produce a load measurement output signal (GW), the first frequency signal serving also as the clock signal for the microprocessor. The microprocessor also compares the first frequency signal with a second frequency signal supplied by a temperature-independent second quartz oscillator (11), thereby to produce a temperature compensation signal (TW).

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patent: 4513831 (1985-04-01), Lee et al.
patent: 4623030 (1986-11-01), Portman, Jr. et al.
patent: 4765377 (1988-08-01), Soloway
patent: 4838369 (1989-06-01), Albert

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