一种新型低值宽带无感分流器时间常数测量方法

doi:10.3969/j.issn.1000-1158.2019.06.02

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Abstract Wide band non-inductance current shunt was widely used in the field of high voltage impulse and high frequency harmonic of the electrical system. The bandwidth of the current shunt was depended on its time constant which contribute to the measurement uncertainty evaluation. The current shunt time constant was determined by least square fitting method to calculate the inductance of current shunt. A high precision multi-meter was employed to measure DC resistance of current shunt. The input of square wave and the output voltage of the current shunt were measured by synchronized digital sampling. Two equivalent cables were connected to the output of signal generator in order to minimize time delay, the influence of impedance matching on the difference between square wave voltage caused by cable resistance and the input terminal voltage of shunt was studied. The result showed that the proposed method can be used to directly measure the inductance and time constant of the low value non-inductance current shunt with resistance value below 1Ω and bandwidth below 10MHz. The traceability problem of wide frequency current sensor and the wide bandwidth non-inductance current shunt was successfully solved with the proposed method.

Key words： metrology impulse current non-inductance current shunt wide band current sensor time constant inductance measurement

Received: 31 July 2018 Published: 10 October 2019

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TB971

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	PAN Yang
	ZHOU Li-ren
	FENG Jian

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PAN Yang,ZHOU Li-ren,FENG Jian. A New Method for the Measurement of Time Constant of Low Value Wide Band Non-inductance Current Shunt[J]. Acta Metrologica Sinica, 2019, 40(6): 946-951.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2019.06.02 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2019/V40/I6/946

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