The Measurement Uncertainty Evaluation of AC Common Mode Rejection Ratio of Data Acquisition Aystems by Using Averaging Method
LIANG Zhi-guo1,FENG Xiu-juan2
1. National Key Laboratory of Metrology and Calibration Technology, Changcheng Institute of Metrology and Measurement, Beijing 100095,China
2. Institute of Mechanics and Acoustic Metrology, National Institute of Metrology, Beijing 100029, China
Abstract：It is described that the uncertainty of evaluation results of AC common mode rejection ratio (CMRR) of data acquisition systems (DAS) by using averaging methods, the interference is calculated by using the means of the absolute sampling data, and the base noise is also calculated as the same method. Then the base noise is cancelled from interference by using direct picking out, and the courses of analysis and evaluation of uncertainty is discussed. Some error sources of CMRR evaluation are discussed, including the signal errors, the gain errors of DAS, the amplitude measuring errors of DAS, the resolution of DAS, the repeatability errors, and the others. The uncertainty model of CMRR of DAS is given out. Combine with an example of experiment, the uncertainty evaluation results of CMRR by using the proposed method is presented.
梁志国,冯秀娟. 平均值法交流共模抑制比测量不确定度评定[J]. 计量学报, 2023, 44(11): 1749-1754.
LIANG Zhi-guo,FENG Xiu-juan. The Measurement Uncertainty Evaluation of AC Common Mode Rejection Ratio of Data Acquisition Aystems by Using Averaging Method. Acta Metrologica Sinica, 2023, 44(11): 1749-1754.
Ding J, Wang J Y, Wang X N, et al. A Nonlinear Error Correction Method for ADC Based High-precision Resistance Thermometry Readout［J］. Acta Metrologica Sinica, 2020, 41(1): 37-42.
Han Q N, Zhou K L, Qu J F, et al. Development of a High-performance Amplifier for Johnson Noise Thermometer［J］. Acta Metrologica Sinica, 2020, 41(10): 1234-1239.
2023, Vol. 44 
