一、前言很多电路中主要用滑线变阻器(简称变阻器)来实现制流作用.滑线变阻器通常是采用经过氧化绝缘处理的,其电阻率受温度影响很小的康铜电阻丝或锰铜丝密绕于瓷管上构成电阻部分.其作用主要是在电路中制流、分流、分压和代替并确定待测电阻之 I. INTRODUCTION In many circuits, sled line rheostats (referred to as varistors) are mainly used to realize the current-carrying effect. Sliding wire rheostats are usually treated with oxidized insulation, and their resistance is affected by the very low temperature of the constantan resistance wire or manganese copper wire. Densely wound on a porcelain tube to form a resistive part. Its role is mainly in the circuit of the flow, shunt, partial pressure and replace and determine the resistance to be measured.