高精度直流大电流标准源的计量测试方法研究

Research on Calibration Method of the High Precision DC Heavy Current Standard Source

针对当前100 A以上高精度直流大电流标准源国家计量技术规范缺失的现状,本文提出了一种以精密电流转换标准、数字多用表和高精度直流大电流标准表作为测量标准进行计量校准的方法,通过配套高精度交流电流标准表、数字示波器、直流电流纹波测试仪等辅助设备,实现对直流大电流标准源电流示值误差、短期稳定性和纹波含量三参数的校准。详细阐述了直流大电流标准源校准用的测量标准、计量特性参数的校准方法和校准点的选取原则等,并给出了校准注意事项。实验验证表明,所列校准项目参数能较全面、科学地反映高精度直流大电流标准源的计量特性,该校准方法合理可行、准确可靠,具有良好的参考价值。

In view of the current situation of the absence of national metrological technical specifications for high precision DC heavy current standard sources over 100 A, one method of metrological calibration using Precision Current Conversion Standard, digital multimeter and high precision DC heavy current standard meter as metrological standards is introduced in this paper. And the calibration of DC current indication error, short-term stability and ripple content of DC heavy current standard source is realized by matching high accuracy AC current standard meter, digital oscilloscope, DC current ripple tester and other auxiliary equipment. Meanwhile the measurement standards, calibration methods of metrological characteristic parameters, and selection principles of calibration points for calibration of DC high current standard sources and so on are described in detail, and the precautions in the calibration process are proposed. It is verified by experiments that the calibration items listed can comprehensively reflect the metrological characteristics of DC heavy current standard source, therefore the calibration method is reasonable, feasible and of great reference value.