Inner weight correcting method for electronic high-accuracy balance

Abstract

The method includes steps as the follow. Weight value P1 of first proof weight is weighed out through the present balance and to stove it in microcomputer; weight value P2 of a standard weight having the same nominal value with the first proof weight is weighed out by the same balance and to store it in microcomputer; D-value is calculated out with the microcomputer and D=P2-P1 is used as correction for the first proof weight; D is led in when calibrating is carried on to obtain correct calibration coefficient K and to store it in microcomputer.

Description

technical field [0001] The invention relates to a method for correcting an internal calibration weight of a high-precision electronic balance, which belongs to the field of weighing instruments. Background technique [0002] Due to the high relative accuracy of the high-precision electronic balance, which is more than one part per million, when the ambient temperature changes, the temperature change of the balance itself after power-on, the aging of components, the change of air pressure, the change of horizontal position, etc. The influence of many factors will make the weighing result incorrect. Therefore, many high-precision electronic balances are equipped with internal calibration weights, when they are affected by external environments such as temperature. Immediately use the internal calibration weight to recalibrate the balance, modify the calibration coefficient, and restore the correct weighing result to the balance, which is very necessary for the weighing of high...

AI Technical Summary

Problems solved by technology

The production of internal calibration weights of high-precision electronic balances has higher requirements. It has high requirements for the density of weight materials, magnetic susceptibility, and surface finish of weights, and has relatively high accuracy for the actual quality of weights. High requirements, such as the actual graduation value of the balance is 0.1mg, the actual mass error of the internal calibration weight should be less than 0.05mg, such a requirement brings difficulties to the adjustment in the production process of the weight, and at the same time, due to the frequent use of The quality of the weight changes due to wear and oxidation, etc., resulting in calibration deviations. It is very difficult to correct the internal calibration weight. At present, there is no effective calibration method for the internal calibration weight.

Images