提出了一种锰铜丝精密电阻的热阻测定新方法，推导出适用于锰铜丝精密电阻的热阻计算公式。通过建立电阻温度特性及负载效应的测试平台，解释了测试得到的锰铜丝零负载效应点现象。实验得到的零负载效应温度点重复性测试结果均达到10-8量级。将已知零负载效应点的锰铜丝精密电阻作为参考电阻，可以对其他电阻进行额定功率下负载效应的准确测试。%A new method of measuring thermal resistance for manganese-copper wire precision resistance is developed. The thermal resistance calculation formula which is suitable for manganese-copper wire precision resistance is derived. A test system for temperature characteristic of resistance and load effect of resistance is built. The phenomenon of zero load effect point is explained. The repeatability of measuring results for of zero load effect point got in experiment is about several parts in 10 - 8. Finally,the load effect testing method for other resistors with rated power is introduced,in which the reference resistor is the manganese-copper wire precision resistor with measured zero effect point.
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