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自动电位差计和自动平衡电桥在测量线路上,都要采用滑线电阻,它是一个很重要的部件,仪表的示值误差、记录误差、不灵敏区以及仪表运行的平滑性等都与滑线电阻的质量有关。对其基本要求是:耐磨、抗氧化、电阻的非线性误差和电阻的温度系数要小。绕制滑线电阻常用的材料有:通用型锰铜、镍铬铝铜合金(伊文丝)、镍铬铝铁合金(卡玛丝)。以前,滑线电阻丝大多数是通用型锰铜,目前国内外仪表中的滑线电阻大部分是伊文丝或卡玛丝制成的。其主要成份为:Cr18～20％、Al 2～4％、Cu1～3％(卡玛丝中取代为Fe 1～3％)、Ni为余量。
Automatic potentiometer and automatic balancing bridge in the measurement line, should be used slide resistance, it is a very important component, the instrument indication error, recording error, insensitive zone and the smooth operation of the instrument are all The quality of slip resistance. The basic requirements are: wear resistance, oxidation resistance, resistance of the nonlinear error and temperature coefficient of resistance is small. Wound slip resistance commonly used materials are: general-purpose manganese copper, nickel-chromium-aluminum-copper alloy (Evans), nickel-chromium aluminum alloy (Kama Si). Previously, most of the slip resistance wire is a general-purpose manganese copper, most of the slip resistance in the instrument at home and abroad is made of Evans or Camamade. Its main components are: Cr18 ~ 20%, Al2 ~ 4%, Cu1 ~ 3% (Camaz substituted Fe1 ~ 3%), Ni is the balance.