Patent attributes
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 portion 1 detects a load of an object to be weighed 12, a processing portion 2 converts a detecting signal from the load detecting portion 1 into a mass value, transmits the mass data to a display portion 3, and controls a sensitivity calibrating mechanism 6a to perform a sensitivity calibration by increasing or reducing internal weights 13 on the load detecting portion 1. An operation control program of the processing portion 2 is built with a tolerance input function 21, a sensitivity calibration execution condition calculating function 22, and a sensitivity calibration execution determining function 24. Whenever the temperature variation reaches or exceeds an allowable temperature variation ΔT, a sensitivity calibration is performed.
