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| A New Method to Compare Two Shunt-TVC Combinations at Common Ground at Frequency up to 200 kHz |
| PAN Xian-lin1,ZHANG Jiang-tao1,SHI Zhao-min1,SONG Ying1,JIA Zheng-sen1,WANG Rong-yu2,DING Xiang3 |
1. National Institute of Metrology, Beijing 100029, China
2. Guizhou Institute of Metrology, Guiyang, Guizhou 550003, China
3. Beijing Institute of Metrology, Beijing 100029, China |
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Abstract Compared with the traditional series connection method, a method based on binary reactance shunt for thermoelectric converter common ground comparison measurement is proposed, so that the AC current range extension can be achieved by series connection. The method was based on binary inductive current divider (BICD) to provide two currents and compare two shunt-TVC combinations directly at common ground.This method can reduce the influence of current leakage and tee connector in series connection. Based on the common ground measurement method, the measurement between two shunt-TVC combinations with 100 mA and 1 A current shunts was done respectively at frequencies up to 200 kHz. At the same time, the measurement of the traditional exchanging position method was carried out in the series mode. The experimental results showed that the measurement error caused by leakage current can be eliminated well based on BICD and exchanging position method, and the two different methods were consistent at 200 kHz, it were better than 3 μA/A. The consistency of AC conversion error of three different shunt-TVC combinations were better than 6 μA/A under the current of 10 mA~1 A.
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