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对于DT-100和TD12等类天平,微分标牌的分度值为1mg,微读机构的分度值0.02～0.05mg。以微分标牌的分度值计算,其全部计量性能均符合《天平检定规程》的要求,最高只达到7级。根据规程中“安装微读机构的天平,若示值变动性不大于该机构的1分度,且其余计量性能也符合与此机构分度值的相应比例关系时,天平的精度可按微读机构的分度值计算”的说明,只要该天平示值变动性<1微读分度,微分标牌误差在+2～-1微读分度,挂砝码的组合误差在毫克组≤2微读分度,克组及全量≤5微读分度,就可以提高精度,甚至跃迁到4级,见表1。
For DT-100 and TD12 and other types of balance, differential label graduation value of 1mg, micro-read institutions division 0.02 ~ 0.05mg. Divided by the value of the differential signage calculation, all of its measurement performance are in line with the “balance test procedures” requirements, up to only 7. According to the rules of the “micro-readjustment of the balance, if the indication of change is not greater than the institution’s 1-point scale, and the rest of the measurement performance is also in line with the scale of this institution proportional relationship, the accuracy of the balance can be slightly read Institutional division of value calculation, ”the description, as long as the balance indication change <1 micro-read differentiation, differential signage error in the +2 ~ -1 micro read the index, the combined weight of hanging weights in the milligram group ≤ 2 micro Read indexing, gram group and full reading ≤ 5 micro-indexing, you can improve the accuracy, or even jump to 4, see Table 1.