milli ohm meter feedback

[Paul Perry]

Thanks for the advice everyone!
I had tried using a LM317 configured as a current source
(10ma) and measuring the voltage developed, but the V was
too low, I need to get some low drift/ low offset op amps
to do this.

Commercial units are (i think) mostly for switch resistance 
testing and use AC currents, which makes life easier as you
can use transformers etc & not worry aboutn drift in the amp.

What I am goint to tru to di is use a couple of cheap
digital multimeters, one on the ohm scale to supply the current.
I'll look at the voltage developed across the probes, 
ampl;ify it, and drive the second meter.

If that doesn't work (because of probe contact resistance)
then 4 wire it is.

BTW I did have one 'crazy' idea thinking about this problem,
Itried to think of a way to 'increase' the resistance seen, 
and then i thought of switched resistors.. if I had a 
perfect switch, and put it in series with the unknown,
with a duty cycle of 1%, then the resistance wd look like
100 times what it really was. And then I remembered the 
meter is digital & who knows what would happen (aliasing?)

paul perry melbourne australia