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Re: How do I properly measure the current of power supply?

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If the PSU has two separate 12V outputs, connecting them together is a bad idea. One of the outputs is likely to regulate to a slightly higher voltage than the other, and will end up taking nearly all the load. If you are using RAMPS, then I suggest you use one output to power the heated bed (the 11A circuit), and the other output to power everything else (the 5A circuit).

You can't measure the "current of a power supply", all you can measure is how much current some load takes when you connect it to the power supply.

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