between this arrangement and the measuring electrode 7 as a result the currents across these parasitic capacitances are not drained via the housing 1 but flow across the measuring electrode 7 and hence also across the terminal impedance 14 15 therefore they participate in the measurement a further advantage of the invention resides in the fact that a component which carries a high voltage and which is in any case required in the high voltage generator at the same time serves as a high voltage electrode for the measuring divider thus reducing the costs and the building volume required moreover in comparison with the voltage divider in conformity with de ps 37 14 945 an advantage is achieved in that the high voltage divider is arranged inside and not outside the clearances relative to the components which do not carry the same high voltage inside the high voltage generator therefore can be reduced moreover the measuring electrode reduces the electromagnetic radiation from the high voltage electrode to other leads and components instead of the high voltage connector another high voltage carrying component already present in the high voltage generator could be used however the high voltage connector 3 4 offers the advantage that the insulation of the high voltage electrode is already present i e no additional insulation needs to be provided between the measuring divider resistor arrangement 8 notably its end connected to the measuring electrode 7 and the high voltage electrode.