I don't have experience on this DMM but usually the Ohms sense terminals
and the correspondent current source ones are internally connected by
resistors that become shorted at the Kelvin connected ends when used in
4 wire connection. If any of this resistors became open you meter will
do weird things when in 2 wire Ohms measurements.
Regards,
Ignacio EB4APL
El 18/05/2013 3:23, Volker Esper wrote
Hi,
I bought a 34401A lately. It's all fine, except it's got a fault when
measuring low ohm with 2-wires: the value runs (monotonic) from 0 to
30 oder 40 Ohms at a speed of say 1 ohm per second and after a while
it decides to run back... When using 4-wires-measurement everything's
alright.
Did anyone have that problem before?
Thank you
Volker
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