【摘要】 在建立我国普朗克常数h测定系统中,对高稳定度直流电源提出了新的要求。本文提出一种基于串联补偿型的专用磁场稳流源。通过设计特殊的采样电阻,选用稳定的基准电压,优选性能突出的运放,并针对感性负载进行关键的补偿,搭建了一套稳定度达到4.5×10-6/30min的稳流源,可用作现阶段普朗克常数h测定系统的磁场稳流源。更多还原

【Abstract】 A constant current source with high stability is required in establishing measuring system of Planck’s constant.The technique based on series compensation type for special constant current source for magnetic field was described.Therewith the constant current source with 4.5×10-6/30min stability was constructed through designing the extraordinary sampling resistor,selecting stable voltage reference and operational amplifier with outstanding properties,offsetting the phase shift of inductive load.As a special constant current source for magnetic field,it presently could serve for the measuring system of Planck’s constant.更多还原