1.前言利用热电转换技术能够最准确地建立工频功率和电能的电学单位,热电转换器的交、直流响应之间的差异可确定到5×10~(-6)以下。据此,已研制出一些电流比较仪电桥,它能依据电阻和直流电压的基本单位来测量交流功率,误差小于30×10~(-6)。交、直流转换是在试验电压下(通常为120V)进行的,这就要求有一个 1. Preface The thermoelectric conversion technology can be the most accurate establishment of power frequency power and electrical energy units, thermoelectric converters AC and DC response to the difference between can be determined to 5 × 10 ~ (-6) or less. Accordingly, a number of current comparator bridges have been developed that measure AC power based on basic units of resistance and DC voltage with an error of less than 30 × 10 -6. AC, DC conversion is the test voltage (usually 120V), which requires a