一、前言RTX型碳膜电阻器是目前国内生产量及使用量都最大的一种薄膜型电阻器。多年来,经过生产和科研部门的不断努力,产品质量已有很大提高。但同国外先进水平相比仍存在着较大的差距,特别是高阻值电阻器的差距更大。在质量认证工作中普遍感到有二项技术指标不易达到。一项是70℃耐久性 I. Introduction RTX-type carbon film resistors are currently the largest production and use of a thin-film resistors. Over the years, through the continuous efforts of production and scientific research departments, product quality has greatly improved. However, there is still a big gap compared with the foreign advanced level, especially the gap between high-resistance resistors is even greater. In the quality certification generally felt that there are two technical indicators difficult to achieve. One is 70 ℃ durability