Development of Wide Band AC Measurement Device with High Accuracy
The working principle and design method of wide range and wide band alternate current measurement device are introduced in this paper. In this device,twostage current transformer is used as a shunt to solve the problem of large current input,non-inverting composite amplifier technology is employed to improve the accuracy of amplified audio signal,the log and anti-log amplifiers are adopted to perform true rms conversion,and ultra-linearity AID converter LTC2400 is used to implement digital sampling. Moreover,moving average filtering technology,frequency compensation technology and photoelectric isolation technology are used to improve the reliability and stability of measurement system readings. Experimental results demonstrate that the accuracy of measured frequency is in excess to 0.02% for the frequencies from 45 Hz to 65Hz,and the linearity of measurement can reach 0.025% for the frequencies from 50Hz to 10 kHz based on basic range of 2A.
rms two-stage current transformer audio ammeter.
Wu Zhu Xiangcun Tu Shuixiu Guan Ruifa Cao
Shanghai University of Electric Power,Shanghai 200090,China
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
935-938
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）