Products > Test Equipment
Wrong DMM probes?
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bd139:
Crap probes don’t work properly in crap meter. I think we have a pattern here!

If you’re going to buy crap stuff, get it off eBay as the customer is always right there. Or use aliexpress with a credit card and charge back it if they screw you.

AVGresponding has the correct answer here. Buy some decent probes. I recently bought the following. Not cheap but they are what the Chinese companies are pretending to produce: https://www.keysight.com/us/en/product/34138A/test-lead-set.html
Fungus:
I have a friend who has an Aliexpress tantrum since about two years ago.

I love showing him all the cheap but good stuff I got on Aliexpress.

The occasional thing that turned out to be sub-standard? No biggie when you're paying half price for everything.


--- Quote from: bd139 on June 17, 2022, 07:10:46 am ---AVGresponding has the correct answer here. Buy some decent probes. I recently bought the following. Not cheap...

--- End quote ---

And especially when you're paying 1/10th of the price.

There's some things you obviously shouldn't buy on Aliexpress, eg. 18650 batteries, common sense says to derate most seller's claims for power, etc., but there's also plenty of things you shouldn't really buy anywhere else, eg. WS2812 LEDs.

Like I said: His loss. I've got some of those leads and they work just fine.
AVGresponding:

--- Quote from: Fungus on June 17, 2022, 06:56:42 am ---PS: You didn't say if the black lead fits the red hole in your meter. We wouldn't want this to be the meter's fault, would we?

--- End quote ---

Yes he did say (it's implied rather than explicit, but I expect people to be able to extrapolate such things).

Uni-T may be at the budget end of the market, and frequently have below par input protection, but they are better than 99% of the junk I see on AliX.

Your statement that your leads from there are fine is irrelevant; the point is that the quality is completely random luck, and the buyer protection is far from good. If you buy Probemaster/Pomona etc leads from a reputable source, they will be good, and you will not need to find out how good the buyer protection is, save perhaps for the occasional "lost in the post" type situation.
Fungus:

--- Quote from: AVGresponding on June 17, 2022, 01:20:46 pm ---Your statement that your leads from there are fine is irrelevant;

--- End quote ---

No, it's a data point in a numbers game.

Imagine a game where you have a better than 50% of doubling your money every time you play. Would you stop playing because you played $3 once and lost? Or even if you lost $5 twice in a row?


--- Quote from: AVGresponding on June 17, 2022, 01:20:46 pm ---the point is that the quality is completely random luck

--- End quote ---

(a quick google search gives...)

https://www.eevblog.com/forum/testgear/fluke-test-lead-quality/

https://www.eevblog.com/forum/repair/pomona-test-leads-repeated-failure/

 :-//
AVGresponding:
The differences in probabilities here is significant, I do not buy your analogy.

That the Pomona micro probe leads are more fragile than normal leads is hardly a surprise; they are tiny, rated at a mere 3A, and in fairness I haven't put enough miles on mine to say for sure, but I would suspect they will last well enough given careful handling.

As for the Fluke TL71 issue, not sure if they are made by Pomona or some other part of the corporation (I suspect the latter) and is a sad indication of some of the cost/corner cutting which seems to be creeping in to Fluke products. Hopefully someone will fire the bean counters before they ruin the company's reputation, but only time will tell.

I'd be frankly amazed if the "gold" on your AliX really is gold. I'd also like to see a measurement of the probe and lead resistance, compared with a "good" brand. I think I'll warm my LCR meter up, and see what it makes of some leads of various quality...
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