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前言遵照伟大领袖毛主席“独立自主,自力更生”的教导,一九六八年中国计量科学研究院与上海电工仪器厂共同协作,设计并制造了XQJ3型直流电阻比较装置。经过四年来的运行实验,证明本装置的性能完全符合设计技术要求,为我国精密电阻计量及电工仪器的发展奠定了基础。一、概述XQJ3型直流电阻比较装置是专门为高精密比较10~(-3)Ω～10~5 Ω范围内的直流基准电阻、标准电阻、非十进电阻以及电阻的“10∶1”过渡而设计制造的成套仪器设备。整个仪器的测量部分工作在能自动控制温度为20±0.005℃的强制搅拌的油槽中。由于比较仪线路采用
Foreword In accordance with the teaching of Chairman Mao, the great leader, “independent and self-reliant,” 1968, China Institute of Metrology and Shanghai Electrical Instrument Factory collaborated to design and manufacture the XQJ3 DC resistance comparison device. After four years of running experiments, the performance of this device has been proved to be in full compliance with the design and technical requirements, laying a foundation for the development of precision resistance measurement and electrical equipment in our country. I. Overview XQJ3 type DC resistance comparison device is designed for high-precision comparison of 10 ~ (-3) Ω ~ 10 ~ 5 Ω range of DC reference resistance, standard resistance, non-decade resistance and resistance of the “10: 1” transition The design and manufacture of complete sets of equipment. The entire instrument’s measuring section is operated in a forced-agitation tank that automatically controls the temperature to 20 ± 0.005 ° C. Due to the comparator circuit used