Abstract: In order to realize the evaluation of bandwidth measurement of digital oscilloscopes, according to the method of digital oscilloscope calibration standard, measures the bandwidth of oscilloscopes. In this paper, analyses the uncertainty sources of measurement result. To Agilent DSO6052A digital oscilloscopes as an example, the paper introduces the measurement result uncertainty evaluation process of the bandwidth of digital oscilloscopes, and given the evaluation results. Practice proves that the method is correct and effective, which can be referenced for writing oscilloscope verification device standard report and evaluation of bandwidth of oscilloscopes.

Key words: Digital oscilloscope, Bandwidth, Evaluation of uncertainty