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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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