基于可靠性指标的测试系统校准周期优化

通过对测试系统校准周期的直接反应法(SRM)和威布尔(Weibull)可靠性模型法的分析、改进,以及对校准过程中误判率的分析测算,解决了测试系统检定决策的风险问题.首先介绍了测试系统可靠性指标的相关计量技术规范,然后通过对常用的校准周期确定方法的介绍与分析,进一步给出了测量可靠性观测值的可靠性概率函数描述方法,并利用主元分析法来综合评价不同测量参数的影响,修正了最佳校准周期的计算.通过对自动测试系统DMM(数字万用表)测量通道的检定,表明这些优化措施是可行的.

Optimal calibration interval of test system based on reliability index

Basing on the analysis and improvement to SRM (Simple Response Method) and Weibull reliability method for calibration intervals of test system, by taking fault decisions on the calibration process into accounts, the decision risks on verification of test system are lowered. In this paper, related national measures standards on reliability index of test system are firstly introduced, then some usual calibration interval determine methods are also introduced, and then the reliability probability function to observational value of test reliability are given. And by synthesizing different parameters with PCA (Principal Component Analysis) method, the estimation values to the optimal calibration interval are corrected. Lastly, the results of verification on digital multimeter (DMM) measurement channel in automatic test system (ATS) are given, and it is said that the calibration intervals optimization methods are feasible.