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The KATRIN (KArlsruhe TRItium Neutrino) experiment aims to determine the massof the electron antineutrino with a sensitivity of 200meV by preciselymeasuring the electron spectrum of the tritium beta decay. This will be done bythe use of a retarding spectrometer of the MAC-E-Filter type. To achieve thedesired sensitivity the stability of the retarding potential of -18.6kV has tobe monitored with a precision of 3ppm over at least two months. Since this isnot feasible with commercial devices, two ppm-class high voltage dividers weredeveloped, following the concept of the standard divider for DC voltages of upto 100kV of the Physikalisch-Technische Bundesanstalt (PTB). In order to reachsuch high accuracies different effects have to be considered. The two mostimportant ones are the temperature dependence of resistance and leakagecurrents, caused by insulators or corona discharges. For the second dividerimprovements were made concerning the high-precision resistors and the thermaldesign of the divider. The improved resistors are the result of a cooperationwith the manufacturer. The design improvements, the investigation and theselection of the resistors, the built-in ripple probe and the calibrations atPTB will be reported here. The latter demonstrated a stability of about0.1ppm/month over a period of two years.

Next generation KATRIN high precision voltage divider for voltages up to 65kV