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4 wire resistance measurement
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cowasaki:
I have a Keithley 2100 which I have been using happily with my decent normal standard probes. 

I recently picked up a 3/4 wire PT100 and that is now set up and working and a few days ago picked up some 4 wire resistance probes.  The 4 wire resistance probes came with no instructions and have no labels on any of the shielded banana plugs.

There are two crocodile clips with a red and black lead running to each.  Now I thought that two wires of the same colour should go to each clip which become input and sense or am I wrong?

So based on the colours if I plug in

clip1 red into red input
clip1 black into black input
clip2 red into red sense
clip2 black into black sense

The CONT doesn't work and 2w & 4w show OVLD

If I select 4 wire resistance I get "OVLD"

----------------

If I totally ignore the socket colours and plug them in as follows:

clip1 red into red input
clip2 red into black input

Then I select 2 wire resistance I get 000.096 ohm
Then I select 4 wire resistance I get OVLD
Then I select CONT I get 0000.11 and a beep

If I now plug in

clip1 black into red sense
clip2 red into black sense

I get the same readings

----------------

If I take clip 1 and stick the red into red input and the black into black input there is no continuity.

glarsson:

--- Quote from: cowasaki on July 23, 2018, 09:10:56 pm ---There are two crocodile clips with a red and black lead running to each.  Now I thought that two wires of the same colour should go to each clip which become input and sense or am I wrong?.

--- End quote ---
That eBay special is not usable for four wire measurements. I don't know what  purpose (if any) they are designed for.
cowasaki:
Thanks. Might have to re-wire them
ArthurDent:
Here is a picture from a Keithley manual that should help.
cowasaki:

--- Quote from: ArthurDent on July 24, 2018, 12:06:27 am ---Here is a picture from a Keithley manual that should help.

--- End quote ---

Thanks, thats the way I thought I had wired it.  Looks like the actual wiring of the clips isn't as expected.  I checked continuity between the wires going to each clip and there was none.  I will see what the supplier says and possibly just re-wire them.
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