Electronic balance

Details Electronic balance Electronic balance

2011-07-19

2011-07-19

Williams, Hezron (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

Reexamination Certificate

active

07980114

ABSTRACT:
An electronic balance is provided, in which a tolerance resulting from temperature variation is variable and a frequency for sensitivity calibration corresponds to the tolerance. A load detecting portion1detects a load of an object to be weighed12, a processing portion2converts a detecting signal from the load detecting portion1into a mass value, transmits the mass data to a display portion3, and controls a sensitivity calibrating mechanism6ato perform a sensitivity calibration by increasing or reducing internal weights13on the load detecting portion1. An operation control program of the processing portion2is built with a tolerance input function21, a sensitivity calibration execution condition calculating function22,and a sensitivity calibration execution determining function24. Whenever the temperature variation reaches or exceeds an allowable temperature variation ΔT, a sensitivity calibration is performed.

REFERENCES:
patent: 5058422 (1991-10-01), Shimauchi
patent: 01221623 (1989-09-01), None
patent: 03-054420 (1991-03-01), None
patent: 03-226628 (1991-10-01), None
patent: 07-128117 (1995-05-01), None
patent: 2000-039536 (2000-02-01), None
patent: 2002-214033 (2002-07-01), None
Chinese First Examination Report of China Patent Application No. 2006800517191, dated Jan. 22, 2010.

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