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准确度是指多次测量的平均值与真值的接近程度。准确度反映了系统误差和随机误差的综合效应,可用绝对误差来表示。要确保检验结果的准确度,必须在工作中把握好以下几个重要环节。1 正确取样、制备试样 取样是指从一批(同一班、同一条生产线、同一种)产品中按“标准”规定和方法取一定数量具有代表性的原始样品全过程。例如,在抽取镀锌焊接钢管试样做硫酸铜均匀性试验时规定应取表面没有缺陷和磕碰的。若有碰坏处就可
Accuracy refers to the average of multiple measurements and the true value of the closeness. Accuracy reflects the combined effects of systematic error and random error, which can be expressed in terms of absolute error. To ensure the accuracy of test results, we must grasp the following important aspects of our work. 1 Correct Sampling, Preparation of Specimen Sampling refers to the whole process of taking a certain number of representative original samples from a batch of (same batch, same production line, same kind) products according to “standard” regulations and methods. For example, in the extraction of galvanized steel pipe specimens do the uniformity test of copper sulfate should be taken without defects on the surface and bump. If you touch bad place can be