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| Kelvin leads for DMM |
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| mawyatt:
Yes, those are from Tonghui. Seems the banana versions are also from Tonghui (same unique Kelvin Clips) and rebranded by B&K TLDK1 as shown by Electro Fan. Tonghui stuff seems first class, and much is rebranded by others. Took a peak inside at the TH2830 we have, it's as well made as present day Keysight equipment (KS34465A for example). Best, |
| mawyatt:
Ran some long term tests while working other things. After about 4~5 hrs we have DIY Kelvin leads connected to one KS34465A and DMM6500. Another KS4465A has 4 wire DIY Zero ohm shunt. The KS34465A Kevin setup has each wire shielded with clips shorted. The DMM6500 Kelvin setup has 4 individual wires all within one overall cable that's shielded with clips shorted. Everything is in open room with AC at ~45% Humidity and ~26C, no attempts to shield for air flow or by not being close by. Results of long term average are: 4 Wire short 50u ohms with SD of 21u ohms (KS34465A) Individual Shielded Kelvin 4 leads 161u ohms SD 19u ohms (KS34465A) Single shielded 4 lead Kelvin -80n ohms SD 5u ohms (DMM6500) All meters had Offset Compensation and AZ active and no null (KS34465A) or reference (DMM6500) were used. Line Synch with 10 for KS and 5 for DMM, averaging filter 50 readings for KS and 20 for DMM. Should have made all these settings close to each other, but didn't think about it when we started the test early this morning, so just reported what we found. Don't have any proper quality non-DIY Kelvin clips with banana jacks to compare with, however the shorted clip tests seem to indicate these DIY Kelvins are acceptable for our needs at the moment, although they likely won't last long with heavy use since the plating is questionable...gold??...how thick?? Edit: Took an image of the Web Server screen showing the 3 meters before changing things, top KS is Kelvin setup, bottom is 4 wire short, left is DMM6500 with Kelvin setup. Best, |
| Kean:
I have a set of the Keysight 11059A I bought in late 2015 a few months before I bought my 34465A. I also have some of the Tonghui measurement sets for my LCR meter - SMD fixture, tweezers, and Kelvin clips. They are pretty good but in my opinion not as nicely constructed as the 11059A set. I haven't tried the Pomona Kelvin leads but generally Pomona quality is reasonable. For things that I rely on as a consultant, I prefer to pay once and cry once. As a hobbyist I'm also happy to buy cheaper stuff that isn't critical and hope it is decent (often it is virtually identical). In this case I believe the 11059A were on special at the time, and I got them a lot cheaper than the current price. |
| tooki:
--- Quote from: mawyatt on March 09, 2022, 07:13:13 pm ---Ran some long term tests while working other things. After about 4~5 hrs we have DIY Kelvin leads connected to one KS34465A and DMM6500. Another KS4465A has 4 wire DIY Zero ohm shunt. The KS34465A Kevin setup has each wire shielded with clips shorted. The DMM6500 Kelvin setup has 4 individual wires all within one overall cable that's shielded with clips shorted. Everything is in open room with AC at ~45% Humidity and ~26C, no attempts to shield for air flow or by not being close by. Results of long term average are: 4 Wire short 50u ohms with SD of 21u ohms (KS34465A) Individual Shielded Kelvin 4 leads 161u ohms SD 19u ohms (KS34465A) Single shielded 4 lead Kelvin -80n ohms SD 5u ohms (DMM6500) All meters had Offset Compensation and AZ active and no null (KS34465A) or reference (DMM6500) were used. Line Synch with 10 for KS and 5 for DMM, averaging filter 50 readings for KS and 20 for DMM. Should have made all these settings close to each other, but didn't think about it when we started the test early this morning, so just reported what we found. Don't have any proper quality non-DIY Kelvin clips with banana jacks to compare with, however the shorted clip tests seem to indicate these DIY Kelvins are acceptable for our needs at the moment, although they likely won't last long with heavy use since the plating is questionable...gold??...how thick?? Edit: Took an image of the Web Server screen showing the 3 meters before changing things, top KS is Kelvin setup, bottom is 4 wire short, left is DMM6500 with Kelvin setup. Best, --- End quote --- Please use the screenshot features of your operating system to take screenshots. Photographs of the display suck in so many ways. As for the plating: you do realize the whole point of Kelvin measurement is to eliminate the effects of test lead and contact resistance? |
| mawyatt:
Edit: @ Kean Those look very nice, and price ($213) isn't that high for KS!! Know what you mean about regarding cheaper stuff for "real " work, and not wasting time. That's why we got the Tonghui TH2830 first with various Tonghui fixtures, including Kelvin clips, Tweezers and Slotted fixture for components with wires. Since our main project tied up the TH and we needed to also to make other measurements and decided to go the cheap approach, since we could "verify" the cheap clips & fixtures with the Tonghui. Later when we needed accurate capacitance measurements, we got the DE-5000 to supplement the TH2830, the DE-5000 is very accurate and spot on when compared to the TH2830, great value IMO!! Over time we would periodically "spot check" the cheap stuff, and trash the inferior/defective items..... so a few clips, cables, connectors, adapters and such ended up in the can!! Best, |
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