直流电动势国家副基准的前身为主基准 ,于１９６５年底通过国家鉴定。该基准用于保存和传递我国的电压单位量值。目前该基准保存在中国测试技术研究院实验基地。直流电动势国家副基准装置由基准器、精密控温油槽及测试系统组成。基准器由２０只饱和标准电池组成 ,其中有国产的 DC emf sub-benchmark predecessor as the main benchmark, by the end of 1965 through national appraisal. This benchmark is used to save and pass on the magnitude of our country’s voltage units. At present, the benchmark stored in the China Test Technology Research Institute experimental base. DC emf sub-reference device from the benchmark, precision temperature control tank and test system. The reference consists of 20 saturated standard batteries, of which domestic