Products > Test Equipment
Measuring 100A DC current
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johansen:

--- Quote from: Stray Electron on June 07, 2024, 11:46:36 pm ---
--- Quote from: BillyO on June 07, 2024, 11:11:29 pm ---
--- Quote from: Fungus on June 07, 2024, 10:57:00 pm ---
--- Quote from: Stray Electron on June 07, 2024, 10:25:33 pm ---    The OP is very naive is he thinks that a 200 Amp shunt from Alibaba is going to be anywhere near as accurate or the size or will  dissipate as much heat as a good quality 100 Amp American shunt!  Chinese products simply aren't made that way.

--- End quote ---

Complete rubbish.

--- End quote ---

I agree completely.  I get sooo tired of all the China bashing that goes on.

If your willing to pay $27,000 for a scope, the Chinese will make you a$27,000 scope that is probably better than any $27,000 US made scope.  However, if you only have $40 to spend on a scope the Chinese can help you out and I guarantee it will be better than every $40 US made scope.

There is no reason to believe those AliExpress shunts are garbage.  None at all.

--- End quote ---

     Everyone here seems to overlook the fact that the OP said that he wanted something cheap. He's not going to buy any top of the line product, Chinese or otherwise.   It's not a question of whether the Chinese can build a good product but more a question of what kind of quality when you buy from an unknown seller on Alibaba at the cheapest price that you can find!

    FWIW I have no reason to bash the Chinese products, there are plenty of postings on this forum and many others, complaining about the quality of every Chinese electronic product that you can name!  Fake transistors, counterfeit ICs, solder that won't stick to anything, "copper" wire that can't be soldered to; tiny capacitors inside of large cans with much higher ratings, batteries with physically impossible amp hour ratings, a water heater that uses the outer metal body as a current carrying conductor;  the list goes on and on!  I know from experience that even when Chinese products to work, most of them are rated right on the edge of destruction and there is no margin for error. And that's why with everyone here worried about the heat dissipation of the OP's shunt, I would not recommend buying one from China, regardless of the price.

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Yep that why i said look on ebay for LEM closed loop sensors.

I bought 3, 100 amp units for maybe 30$ last year.
pdenisowski:

--- Quote from: Martin72 on June 06, 2024, 10:03:40 pm ---But that is precisely the problem. Finding a current clamp that is that accurate.
If you're lucky, you'll find one with 1%, which is already very accurate for a current clamp, but costs much more than a current shunt, which is even more accurate.

--- End quote ---

How about a current probe?  We (R&S) make current probes that measure over 100 Amps DC with 1% accuracy.

https://www.rohde-schwarz.com/us/products/test-and-measurement/oscilloscope-probes/current-probes-for-oscilloscopes_63493-73797.html
Fungus:

--- Quote from: Stray Electron on June 07, 2024, 11:46:36 pm ---    FWIW I have no reason to bash the Chinese products, there are plenty of postings on this forum and many others, complaining about the quality of every Chinese electronic product that you can name!  Fake transistors, counterfeit ICs, solder that won't stick to anything, "copper" wire that can't be soldered to; tiny capacitors inside of large cans with much higher ratings, batteries with physically impossible amp hour ratings

--- End quote ---

In other news: People don't read seller ratings, buy things at prices that are too good to be true, and are predisposed to hate on "China".

If it doesn't work, send it back.  :-//

PS: I can buy Fluke multimeters on Aliexpress, Rigol/Siglent oscilloscopes, etc.
coromonadalix:
the problem is :    when you say  "cheap"  and put 6.5 digit meters on them,  what do you expect ?

i have 6.5 digit dmm's  and 1 amp of resolution is enough for 200 amp shunts
Calvin:
Hi,

similar as #6 and #28 I´d throw Hall- or Fluxgate sensors in the ring  ;)
See for example the N4646 series from Vacuumschmelze sourceable from Mouser (say the T6044-N4646-X412) for less than 17€/pcs.
I have KiCad PCB-designs for the X400, X410 and X412 and the voltage-output 15A type X662.

regards
Calvin
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