Products > Test Equipment
Wrong DMM probes?
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bd139:
PVC wasn’t the problem. It was the 3A fuse wire they made the inside of the PVC with  :-DD
Fungus:
Everybody has to learn that lesson.

AVGresponding:

--- Quote from: Fungus on June 17, 2022, 05:51:14 pm ---
--- Quote from: AVGresponding on June 17, 2022, 04:37:12 pm ---Keysight 34138:                                       0.02043Ω
Unknown PVC:                                          0.02052Ω
Very old and solder burned Fluke TL71:        0.03050Ω
RS Pro modular:                                        0.05711Ω
Brymen BL21:                                           0.08410Ω
Pomona 6366:                                          0.08939Ω
Pomona 6342:                                          0.09373Ω

--- End quote ---

I sorted the list into order. It seems "unknown PVC" beats all big brand names except one.  :)

Edit: And only loses to that one by a 0.4% margin(!)

--- End quote ---

Incorrect. My reason for posting this list of data points was to illustrate that without proper context, data points are useless.

What are the materials, what are the lead lengths, what are the current ratings of the leads, are these readings consistent, or do repeated readings vary widely?

Just like anecdotal examples of poor lead quality are useless in isolation.
rsjsouza:
So, in summary: the OP's datapoint that his probes are crap because one of them does not fit on a jack invalidates the other three contrary datapoints from other people (including mine with the seller I bought, which I got from Fungus) because datapoints are all invalid. Then, two more people provide datapoints of Louis Vuitton probes say they are better, but these also must be discarded because datapoints are all invalid. Then a table that shows loose resistance datapoints between generic and Louis Vuitton probes is used to prove that all datapoints are invalid, but that also must be discarded because all datapoints are invalid.

Holy crap, AVG, you really need that beer, man. Peace.
2N3055:

--- Quote from: AVGresponding on June 12, 2022, 08:36:44 am ---Other issues with cheap leads can be high resistance and low current capacity. There is a tendency to cheap out and use plated aluminium instead of copper. Given the relatively low cost of decent leads, unless you regularly destroy them it's worth getting some Probemasters or Pomonas, though Simon seems to be out of stock of the Brymen branded Pomonas. Shouldn't cost more than £20-30 shipped in the UK, and will last a lifetime if you take care of them.

--- End quote ---

You mean that Pomona makes probes for Brymen?  :-//  That is highly unlikely, opposite direction would be more likely..

Pomona Electronics is a wholly-owned subsidiary of Fluke Corporation. There are no Fluke and Pomona test leads, they are all the same.
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