SandiegoSD
New Member
Yep I have the two Keithley books.This https://www.electro-tech-online.com/custompdfs/2012/11/LowLevMsHandbk_1.pdf is worth a read, but didn't have the info I wanted.
Look at this article: http://en.wikipedia.org/wiki/Four-terminal_sensing and the video referenced at the end.
Here is Keithley's Low Resistance handbook: http://www.keithley.com/data?asset=55835
Looks like I do need to use separated clips/jaws for true four-wire setup.What were the values of voltages and currents for both measurements?
The soldered connections do contain two dissimilar metal junctions. wire to solder and solder to pin
Clipping the leads to the pin don't.
If I directly put the volt meter probe on the metal pin(outside of the pin body), the reading is slightly smaller than what's measured at the end of the voltage sensing wire. So very likely the blob of solder joint and some contact resistance are picked up when using the wires like this. I'll try soldering the volt sensing wires on the outside of the metal pins, and keep the current wire as is.