Uncertainty evaluation on the absolute phase error of digitizers. (February 2020)

• Record Type: Journal Article
• Authors: Femine, Antonio Delle; Gallo, Daniele; Landi, Carmine; Luiso, Mario
• Other Names: Tan Chao guest-editor.
• Is Part Of: Transactions of the Institute of Measurement and Control. Volume 42:Number 4(2020)
• Page Start: 749
• Page End: 758
• Publication Date: 2020-02
• Subjects: Phase measurement -- digitizer -- calibration -- discrete Fourier transform -- phasor measurement unit -- synchrophasor -- digital low power instrument transformer; Automatic control -- Periodicals; Measuring instruments -- Periodicals; Commande automatique -- Périodiques; Mesure -- Instruments -- Périodiques; 681.2
• DOI: 10.1177/0142331219879836
• Languages: English
• ISSNs: 0142-3312

Abstract

In many engineering applications the phase angle of a signal is a key parameter. Especially when measuring small angles, the measurement accuracy is of a vital importance. Often, the absolute phase error of a digitizer, which is defined as the phase displacement between the digitized output and the input analog waveform and which represents a systematic measurement error, is neglected. Therefore, in this paper, a new measurement technique for the evaluation of this absolute phase error is discussed, along with a deep theoretical analysis on the uncertainty sources and how to handle them. The measurement technique is validated through a high accuracy experimental setup. Experimental tests demonstrate that even high accuracy digitizers can show non-linear behavior in the absolute phase errors.