一种高精度组合式多功能校准仪的设计及验证

Design of high precision modular multifunction calibrator

当前各种电学参量校准装置通常为一体化设计,只能对单一参量校准。设计一种高精度组合式的多功能校准仪,将电压比例标准(U/U)、电流比例标准(I/U)以及双通道电压比较器进行独立设计、校准和应用。使用多功能校准仪对U/U各输出档校准,最大误差为3.3×10-6;对多功能校准仪进行不确定度分析,最大不确定度为3.8×10-6。测试结果表明:增加校准仪的应用功能和范围,可以提高校准仪的测量不确定度和校准精度。

Various calibration devices for electrical parameters usually are designed integrated, and a calibration device can only calibrate a single parameter. This paper introduced a high precision modular multifunction calibrator. The muhifunction calibrator was divided into three parts which included a voltage ratio of the standard （U/U）, a current ratio of the standard （I/U） and a dual-channel voltage comparator. They were respectively independent in design, calibration and application. Each output of U/U was calibrated by modular muhifunction calibrator, and the maximum error was 3.3×10^-6. Uncertainty analysis of modular multifunction calibrator was done, and the largest uncertainty was 3.8×10^-6. Test results show that the function and scope of application of calibrator are extended and the uncertainty and calibration accuracy is improved.