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电线电缆导体直流电阻测量不确定度的来源

    人们长期以来认为,由于电线海南私彩app电缆导体直流电阻测量实验方法和实验设备的不完善,周围环境的影响,以及受认识能力所限等,测量和实验所得数据和被测量真值之间,不可避免地存在着差异,即误差.被测量的“真值”是不可知的,在实际工作中能得到的仅是“合理赋予被测量的值”,且不止一个,可以是多个.这些值的分散性就是不确定度.

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    通过对电线电缆海南私彩app导体直流电阻测量的原理、设备、方法和过程的分析,导体直流电阻的不确定度来源主要包括:1)测量重复性的不重复引入的不确定度Ua,采用A类方法评定;2)双臂电桥准确度引入的不确定度Ub1,采用B类方法评定;3)刻度尺误差引入的导体长度不确定度Ub2。,采用B类方法评定;4)温度测量引入的标准不确定度分量Ub3。采用B类方法评定;5)电阻温度系数A20引入的不确定度分量Ub4.导体温升和接触电阻等引入的不确定度等可以忽略不计].