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| High resistance leads on meter |
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| shapirus:
--- Quote from: TomKatt on February 23, 2023, 12:11:28 pm ---The probes shown by the OP seem to have been polished or otherwise had their gold plating stripped off. Somethings seems awry there. --- End quote --- He mentioned that he polished them in a troubleshooting attempt. The issue existed before that. |
| BillyO:
Doesn't the EEVBLOG BM235 come with the gold plated leads? My 786 did. |
| Qmavam:
--- Quote from: shapirus on February 23, 2023, 12:46:09 pm --- --- Quote from: TomKatt on February 23, 2023, 12:11:28 pm ---The probes shown by the OP seem to have been polished or otherwise had their gold plating stripped off. Somethings seems awry there. --- End quote --- He mentioned that he polished them in a troubleshooting attempt. The issue existed before that. --- End quote --- While looking at the ProbeMaster probes I saw a picture comparing the Bryman probe to the ProbeMaster probe. The Bryman was goldplated, I looked at mine, the threaded area is still gold, but I could only find a tiny part on one probe that had any gold on it. I can think of nothing I did to remove the gold, Yes, I did rub it on the carpet to try and remove any tarnish, but by the time I did that, I was already having problems, because the gold was gone. It must have been very then plating. I'll be ordering the ProbeMaster probes. See picture attached. of good tips vs my tips. |
| shapirus:
Wow. I thought you polished them in order to actually remove the plating to make sure it wasn't it that added the extra resistance. If it's not the case, then I wonder what else could happen to these tips that not only removed the plating, but also dulled their ends to such an extent. They definitely lived a hard life. |
| Stray Electron:
--- Quote from: Qmavam on February 22, 2023, 04:32:44 pm ---I have a Bryman 235 meter, on the low ohms/beeper setting with the leads shorted, I get a 10Ω to 15Ω reading. If I use shorted dual banana plug I get zero Ωs. If I use one meter lead and touch the opposite banana connector I get 1.8Ω with either probe. I polished up the tips and did lower the resistance down to 4.8Ω to 1.8Ω. But that is inconsistent and depends on how hard I press the leads together. The problem is not broken wires in the leads, (not my first rodeo). Should I just replace the original leads and if so, who sells a compatible set of quality leads. Thanks, Qmavam --- End quote --- That's actually pretty common. Just about all meters will read like that. You really are seeing the resistance of the leads as well as the resistance of the DUT (Device Under Test) (all three in series) which is technically correct. Most meters are not designed to read in the low ohms range very well. If you want to read ONLY the DUT resistance then you need to use a 4-wire meter with Kelvin connections to the DUT. That technique nullifies the test lead resistance and all you will see is the resistance of the DUT. That said: Yes some leads have more resistance than others but ALL test leads have some resistance and that resistance has to be taken into account if you're testing DUTs that have very low resistance. |
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