Determining the voltage linearity of a large impulse voltage divider used in the testing of ultra-high-voltage (UHV) equipment is a challenging task. This leads to the question of whether the uncertainty requirements, specified in the present edition of IEC60060 [1, 2], can be met in the UHV range. This paper presents the results of voltage divider linearity tests at voltages up to 2400 kV. Mea...