2.500V电子标准电池的设计

Design of 2.500V electronic standard cell

设计了用于"十—线电势差计测电池的电动势"实验的2.500 V电子标准电池,采用电压参考芯片MAX872,输出2.500 V(相对误差为0.05%)的标准电压ES,等效内阻约为1Ω,微功耗,不怕短路,不易损坏,2节干电池供电.配以J0409灵敏电流计进行实验,解决了目前常用仪器组合方案中的标准电池、灵敏电流计易于损坏,校准时灵敏度不够而测量时灵敏度过高的问题.

The 2. 500 V electronic standard cell is designed with voltage reference MAX872 for the physical experiment of ＂electromotive force measurements of cell using 11-wire potentiometer＂. The output standard voltage Es is 2. 500 V, and the equivalent internal resistance is about 1 Ω. It is low power consumption, no damage under short circuit conditions, serviceable and uses two dry batteries as power Supply. So, the problems, such as the standard Cell and galvanometer are easily damaged, and the potentiometer is under-sensitive in adjustment but over-sensitive in measurement with traditional instruments, can be solved with this 2. 500 V electronic standard cell and J0409 galvanometer.