The key measuring technologies, ineluding high stable constant current power source, high capability gain amplifier, four probe method, and high precision A /D converter, were summarized.

• 论述了微小电阻测量的两种方法,总结了测量采用的四个关键技术:精密恒流源、高性能测量放大器、四引线法、高精度A/D转换器。