对《灵敏电流计特性研究》实验指导的探讨  

A discussion about experimental instruction of "The research of galvanomoter's characteristics"

作　　者：刘先慧[1] 

机构地区：[1]西昌学院物理系,西昌615022

出　　处：《西南民族大学学报（自然科学版）》2004年第6期853-855,共3页Journal of Southwest Minzu University(Natural Science Edition)

摘　　要：针对《灵敏电流计特性研究》实验中存在的疑难点,从灵敏电流计的结构特点出发,补充强调了电流计与一般的指针磁电式电表的主要区别之一是其活动部分没有产生电磁阻尼矩的铝制框架,电磁阻尼矩只能由动圈和外电路闭合后产生;并补充说明了为什么对电流计机械调零时应使外电阻等于电流计的临界电阻.为了让学生正确使用电流计,介绍了电流计的分流器结构.最后强调说明了应使电流计工作在甚过阻尼状态下,才能精确测量其内阻.This paper discusses about the difficulty existing in the experiment which is about the research of the galvanometer's characteristics. From the view of the characteristics of the galvanometer's structure it stresses one of the main differences between the amperemeter and the common pointer magnetoelectric ammeter. This difference lies in that the former's active part is aluminium frame without producing electromagnetic damping moment, and electromagmetic damping moment can only be produced by closing the driving ring and outer circuit; and it gives that the additional instruction of the reason about the outer resistance of amperemeter equals the critical resistance when you adjust the amperemeter to zero. And this paper introduces the flexible shunt structure of amperemeter in order to let students use amperemeters correctly. The last point put forward in this paper is that the internal resistance can be measured accurately only when the amperemeter works under the damping condition.

关 键 词：电磁阻尼 实验指导 灵敏电流计 学生 区别 活动 补充说明 电表 内阻 外电路 

分 类 号：N94[自然科学总论—系统科学] TM933.1[电气工程—电力电子与电力传动]