Hello Volker,
welcome here.
Currently, my 34401A shows a similar behaviour, on the rear connectors only.
2W Ohm there drifts up and down, several 10 digits in 6 digit mode,
whereas the measurement is stable on the front connectors.
4W Ohm is stable even on rear connectors.
Obviously, the front/rear switch is oxydized, or otherwise faulty.
Please, check the measurement on the rear connectors also.
Regards Frank
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