TY - JOUR N2 - A high accurate electronic instrument transformer calibration system is introduced in this paper. The system uses the fourth-order convolution window algorithm for the error calculation method. Compared with Fast Fourier Transform, which is recommended by standard IEC-60044-8 (Electronic current transformers), it has higher accuracy. The relative measuring errors caused by asynchronous sampling could be reduced effectively without any special hardware technique adopted. The results show that the ratio error caused by asynchronous sampling can be reduced to 10-4, and the phase error can be reduced to 10-3 degrees when the deviation of frequency is within ±0.5 Hz. The present method of measurement processing is achieved by a high-accuracy USB multifunction data acquisition (DAQ) card and virtual measurement devices, with low cost, short exploitation period and high stability. L1 - http://www.journals.pan.pl/Content/89782/PDF/Journal10178-VolumeXVIII%20Issue2_13paper.pdf L2 - http://www.journals.pan.pl/Content/89782 PY - 2011 IS - No 2 EP - 322 DO - 10.2478/v10178-011-0013-x KW - Electronic instrument transformers KW - Digital output KW - Calibration system KW - Virtual instrument KW - Fourth-order Convolution Window A1 - Yue Tong A1 - Ye, Guoxiong A1 - Keqin Guo A1 - Hongbin Li PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2011 T1 - Highly Accurate Calibration System for Electronic Instrument Transformers SP - 315 UR - http://www.journals.pan.pl/dlibra/publication/edition/89782 T2 - Metrology and Measurement Systems ER -