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1977年11月全国膨胀土会议拟定的《膨胀土室内膨胀及收缩试验操作方法》中,关于称试样重量的一条规定:“称完后放回原位,调整百分表指针至试样称重前的读数”。这样每称重一次,就要调整一次百分表,操作麻烦,而且反复移动土样与调整百分表,往往造成不易发现的误差,影响试验结果的精确度。
In the “Expansion Soil Expansion and Shrinkage Test Operation Method for Expansive Soils” prepared by the National Expansive Soils Conference in November 1977, a rule concerning the weight of a sample was put back into place after weighing, and the pointer of the dial indicator was adjusted to the sample. Read before weighing. In this way, once each weighing operation is performed, the dial indicator must be adjusted once and the operation is troublesome. Moreover, repeatedly moving the soil sample and adjusting the dial indicator often result in inconspicuous errors and affect the accuracy of the test results.