Abstract：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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