Electronics > Projects, Designs, and Technical Stuff

How do you tell what "type" of power a DC power supply is?

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DW1961:

--- Quote from: james_s on July 24, 2020, 06:53:30 am ---Anyone who does anything at all with electronics should have a multimeter, even if it's just a basic $20 model. A bench power supply with CV and CC modes is very handy but there are substitutes you can use in a pinch to accomplish most things.

--- End quote ---

I have three DMMs. All capable of doing current test. What could I use for a power source instead of getting a bench supply? I mean, they're like $120.00 bucks on Amazon.

DW1961:

--- Quote from: AndyC_772 on July 24, 2020, 08:16:44 am ---
--- Quote from: capt bullshot on July 23, 2020, 05:08:48 pm ---Might be just for regulation and applied standards reasons.

Lighting is a different kind of equipment than e.g. a general purpose power brick, so it's tested and declared conforming to different standards.

--- End quote ---

^^^ This.

If a power supply is sold with a CE mark, then it's sold as being compliant with all applicable standards.

If the set of standards which apply is different - say, because it's being used with computing, communications or other equipment, instead of the type of equipment for which its testing and certification applies - then it's no longer compliant.

--- End quote ---

Good information, but why does that power supply I linked to above have  a CE mark on it and say "LED use only?" Also, how could you test it to make sure it is compliant? I'd love to know that. Does complaint mean ripple and etc are in spec?

John B:
For the same reason it says UL LIGTED, all it proves is that they have a silkscreen printer. Hence why I try to stick to industrial brand name supplies from legit suppliers.

DW1961:

--- Quote from: John B on July 24, 2020, 08:35:29 pm ---For the same reason it says UL LIGTED, all it proves is that they have a silkscreen printer. Hence why I try to stick to industrial brand name supplies from legit suppliers.

--- End quote ---

lol, yep. I guess the only way to test it is to put it under load and xx heat and scope it. I don't have that ability, sadly. It would be interesting to see exactly what it's doing.

I know I'm going to have to get a scope and learn how to use it to test stuff like this. I just want to KNOW!

james_s:
If you have any serious interest in electronics you should get a scope, they've gotten really cheap, relatively speaking. A decent 4 channel scope costs less than most smartphones these days.

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