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Kelvin leads for DMM

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Traceless:

--- Quote from: SHTechnics on March 08, 2022, 09:02:21 pm ---I got these from Banggood and they work fine : https://www.banggood.com/Y238-2Pcs-LCR-Bridge-Test-Cable-Universal-Digital-Multimeter-Plug-Milliohm-Test-Line-Test-Clips-p-1482576.html?imageAb=2&rmmds=myorder&cur_warehouse=CN

--- End quote ---

I just found a deal on those leads SHTechnics mentioned before and thought I'd share that here in case someone else is interested in giving these a try as well.

Electro Fan:
Resurrecting an old thread but it's sort of relevant.

Awhile back in trying to compare a few models of Kelvin clips I made some posts (earlier in this thread) measuring the resistance of 45cm of 18 AWG copper wire.  I got about 9.5 to 9.7 milliohms with some slight variations depending on room the clips/leads I used and maybe some temperature variation. 

In thinking about jumpering acrosss some traces on a circuit board using 30 AWG kynar wire I figured I should check to see what the current carrying capacity of 30 AWG kynar wire is.  After looking that up I decided to test it.  When I started the test I noticed that the results looked like about 150 milliohms and I then went back to doing some other work.  When I looked up I noticed the test was still running but I couldn't explain why the pattern appears as it shows below.  I can believe that my room temperature changes but probably not with such a symmetrical pattern.  Anyone have some ideas on why the resistance pattern looks like this?  Thx 

Edit:  Kind of duh....  :palm:

Looks like the original copper wire measurement was done with the histogram and the first kynar measurement was done with the trend display.  In looking at the new (2nd image) posted here the histogram for the kynar measurement sort of resembles the copper wire histogram.  I'm guessing that if I had done the copper wire measurement with the trend display I might have seen the variable pattern.  However in thinking about it, I'm still not sure what accounts for the symmetry in the kynar trend display.

mawyatt:
Seen this type of display before, it was attributed to the AC cycling in our case.

Best,

BillyO:

--- Quote from: Electro Fan on August 30, 2023, 01:51:44 am ---Anyone have some ideas on why the resistance pattern looks like this?  Thx.

--- End quote ---

Is the environment air conditioned?

Electro Fan:

--- Quote from: BillyO on August 30, 2023, 02:38:31 am ---
--- Quote from: Electro Fan on August 30, 2023, 01:51:44 am ---Anyone have some ideas on why the resistance pattern looks like this?  Thx.

--- End quote ---

Is the environment air conditioned?

--- End quote ---

Yes, it is.  Do you think the AC comes and goes that symmetrically?  Seems slightly hard to believe but maybe....

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