In the uncertainty assessment of pulse high voltage amplitude measurement, the uncertainty sources are divided into oscilloscope measurement uncertainty and probe uncertainty from the perspective of measurement and calibration traceability. Taking the measurement of the three-plate line input voltage of the single-channel prototype of the primary experimental platform as an example, the uncertainty caused by the random effect of the three-plate line voltage measurement, the uncertainty caused by the system effect and random effect during the calibration of the DDOT probe and the resistor divider, the calibration uncertainty of the oscilloscope and attenuator, and the resolution uncertainty of the oscilloscope are analyzed according to the source of the probe uncertainty. At the same time, the frequency response analysis of the test and calibration system is carried out to prove that the measured signal is within the frequency response range of the test system. Based on the relevant experimental data, the various uncertainty components, the synthetic standard uncertainty and the expanded uncertainty are calculated. According to the requirements of engineering measurement, the inclusion factor is taken as 2, and the measured value of the three-plate line input voltage is 1.89 MV, and the expanded uncertainty is 3.9%. Keywords: pulse high voltage; measurement; calibration; uncertainty
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