关于检重秤的精度
发布日期:2024-11-21 15:02:30

检重秤的精度定义

在相同条件下,用同一件样品在检重秤上反复测试,当测试数量足够大时,它们会呈正态分布曲线(也称高斯曲线)。C:\Users\Administrator\Desktop\检重秤精度.png

在正态分布中σ代表标准偏差(STD DEV),μ代表平均重量。标准偏差反映单次检重值相对于平均检重值的偏离程度。标准偏差越大,精度越差。平均值相同,校准偏差也未必相同。

标准偏差公式:

∑:求和 xi:单次检重值 x^:平均检重值 N:测试次数

通常情况下,我们以±3σ(±3倍标准差)来定义一台检重秤的精度,即样品所有测试的重量分布在(μ-3σ,μ+3σ)中的概率为0.997,可以认为,测试的重量值几乎全部集中在(μ-3σ,μ+3σ)区间内,超出这个范围的可能性仅占不到0.3%。简单地说,就是测试1000次,最多允许有3次不合格。

对于给定的产品,在一定的检测条件下,其标准偏差值越小,代表该检重秤的动态精度越高。但需要明确的是:动态精度一定是在给定的产品、给定的检测条件和给定的精度定义方法的前提下的精度。

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