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根据目前科研和生产任务对超低频相位检定的需要,七机部第一研究院计量站在各兄弟单位的协助下,于一九七七年底研制成功了JL-7002型超低频移相器,七八年上半年总装调试了六台,按照四机部有关电子工业例行试验规范,从六台中抽出二台进行了高温、潮湿、低温、振动等各种环境条件下的性能试验。并用美国的209A型相位标准和英国的1172型超低频频率特性分析仪进行了测试,结果证明移相器性能良好。七八年七月二十二日至二十八日经七机部第一研究院邀请中国计量科学研究院、七机部二院计量站、天津市电子仪器厂、三机部六一八所、六三○
According to the current research and production tasks on the need of ultra-low frequency phase verification, the measurement station of the First Institute of the Seventh Plant, with the help of various fraternal units, successfully developed the JL-7002 ultra-low frequency phase shifter at the end of 1977, In the first half of 1988, a total of six sets were commissioned and commissioned. Performance tests under various environmental conditions including high temperature, humidity, low temperature and vibration were carried out in accordance with the routine test regulations of the four-machine department on the electronics industry. And with the United States 209A-phase standard and the United Kingdom 1172 ultra-low frequency frequency characteristics analyzer was tested, the results prove that the phase shifter performance is good. From July 22 to July 28, 1978, the 1st Research Institute of Seventh Machinery Department invited China Metrology Institute, the Second Metrology Station of the Second Machinery Department, the Electronic Instrument Factory of Tianjin City, , Six three ○