the only thing that worries me a bit is the usage of dissimilar metals between the clip and the wire termination ( where the screw goes in )
that may give thermocouple effects..
Honestly, I don't know enough about this but if there are any tests I can do with an HP 34401A and these leads, then let me know.
Vincent, or somebody , please elaborate more details about this so called "Thermocouple Effects" as I'm going to build my kelvin clip for my PM6306 LCR meter.
Hi,
these thermocouples inside a measurement setup build thermoelectric voltages, which disturb Ohm measurements, 2W or 4W alike, when the resistance is measured with a constant DC current which produces low level voltages over the DUT.
This error can be cancelled by the offset compensation method, i.e. the DC current is switched on and off.
If you want to do high precision Ohm measurements, i.e. within a few ppm, you need this OCOMP feature, or you need to use better Kelvin clips.
AC impedance measurements are usually not affected, so these clips are ok for your PM6306, when you use low frequencies.
At high frequencies, the cables will create big errors by parasitic capacitance and polarisation of the silicone.
Some nice references (simply search for: Ohm Measurement Offset):
Keithley Offset CompensationOCOMP adaptorFrank