The article is dedicated to calibration of DC high voltage measuring instruments which are used for control of voltage under insulation test of electrical equipment. Procedure of calibration of DC high voltage measuring instrument on National standard unit of DC voltage within range 1 kV to 180 kV DETY 08-04-99 is given. The sources of measurement uncertainty are shown. The evaluation of measurement uncertainty under calibration is performed.
scale coefficient, voltage correction, high voltage measuring instrument, standard deviation, residual systematic error, measurement uncertainty