High precision instruments of measuring electrical resistivity and magnetoresistivity are needed to study the inner structure and resistance characteristic of nanocrystalline materials. 研究纳米材料内部结构和电阻输运机制需要有高精度的仪器来测量纳米材料的电阻率和磁阻。
Kelvin bridge has the virtues of high sensitivity, precision reading and convenience to use.It is effective tools to measure the electrical resistivity and magnetoresistivity. 凯尔文直流双臂电桥具有灵敏度高、读数准确和使用方便的优点，是测量材料电阻率和磁阻的有效工具。