论文部分内容阅读
一、引言电阻温度系数为精密电阻合金最重要的电学性能之一。在高精度的仪器仪表中,对电阻温度系数的要求极为严格,通常要求电阻合金在使用温度区间内,阻值不发生变化。所以精密电阻合金生产上的质量控制,主要是控制温度系数。电阻温度系数的测量,各国均采用烦杂的标准方法。一个样品,通常要预先经过涂漆,绕样于骨架上,长时间热老化处理,再用电桥或电位差计法测量其某一温度区间的电阻值,由此算出温度系数;至少得花四天的时间才能提出测试报告(并且,标准法测量的误差通常在10%以上,而对于电阻温度系数低于10×10~(-6)/℃的测量误差甚至超过20%)。因此电阻合金的生产厂,往往只能抽查其产品的10～15%,而绝大部分产品无法了解其性能,
I. INTRODUCTION The resistance temperature coefficient is one of the most important electrical properties of a precision resistance alloy. In high-precision instrumentation, the temperature coefficient of resistance is extremely stringent, usually require the resistance alloy in the use of temperature range, the resistance does not change. Therefore, the production of precision resistance alloy quality control, mainly to control the temperature coefficient. Resistance temperature coefficient of measurement, all countries are using complex standard methods. A sample, usually pre-painted, wound around the skeleton, heat aging for a long time, then the bridge or potentiometer method to measure the resistance of a temperature range, which calculates the temperature coefficient; at least flowers The test report can be submitted within four days (and the error of the standard method is usually above 10%, and the measurement error is even over 20% for the temperature coefficient of resistance below 10 × 10 -6 / ° C). Therefore, the production of resistance alloy, often only spot checks its products 10 to 15%, while the vast majority of products can not understand its performance,