摘要
本文详细介绍了用作我国电感工作基准的改进型麦克斯韦-维恩电桥。用0.01μF的电容器和10kΩ的电阻器与7位感应分压器相结合以代替可变电容箱和可变电阻箱,并用一个参考电容器来校准这个0.01μF的电容器,从而克服了可变电容箱和可变电阻箱准确度低的缺点。用R-C网络和感应分压器来进行电源平衡,以使指零仪达到地电位。在50～2500Hz的频率范围内测量100μH～100H电感器的不确定度为3×10^(-5)(3σ);在100Hz下测量1～100μH电感器的不确定度为3nH。可用一个更准确的标准电感器对电桥进行自校,这就很容易获得更高的电感测量准确度。
A modified Maxwell-Wien bridge used as the national inductance working standard is described in detail. The combination of a 0.01μF capacitor and a 10kΩ resistor with a 7—decade IVD is applied instead of both the variable decade capacitance box and variable decade resistance box, and the 0.01μF capacitor is calibrated with a reference capacitance standard. In this way, the defects from the lower accuracy of the variable capacitance and variable resistance boxes are overcome. A R—C network and IVD are used for the source balancing to obtain ground potential of the detector. The measurement uncertainty is 3×10^(-5) (3σ) in 100μH～100H in the frequency range of 50～2500Hz, and 3nH in 1～100μH at lkHz respectively. The bridge can be calibrated by itself with a high accurate inductance standard, so better measurement accuracy of inductance may be easily achieved.
出处
《计量学报》
CSCD
1996年第1期6-11,共6页
Acta Metrologica Sinica
关键词
工作基准
电感测量
电桥
Maxwell-Wien bridge
Working standard
Inductance measurement
