Electronics > Beginners
4 wire resistance measurement
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"
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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
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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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