Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm trying to test a psu, to establish if it is reliable or not. The voltages on the various connectors are ok, but I'd like to know if there's a way to measure the current that flows in the cable during the usage to be sure that the psu can support the pc hardware even when it is under heavy load.

Is there a solution for this?



Thanks for the corrections, I'll try to be a little more precise, I'd like to measure the 18A on the 12V power line, and check that the psu can supply all the 18A, in case the pc is in full load, so that the psu won't power off, because it can't supply all the requested current. Hope this explanation is better than the previous one.

share|improve this question
How would measuring current tell you if the PSU can support the PC hardware? And which cable are you talking about? – David Schwartz Nov 19 '12 at 0:13
Since these are DC voltages and currents, you cannot use a clamp meter, and would have to insert an ammeter. But more often, low voltage is used to detect excessive current draw from a PSU, i.e. the voltage rail "sags" when overloaded. BTW "erogated" is not a verb to be combined with the subject "current". – sawdust Nov 19 '12 at 0:33
Actually, there ARE clamp-on meters that will work, but they are expensive units using Hall effect or some such. However, it's not hard to get a PSU cable extension, cut the wires, and insert a meter. But to assure that a PSU can supply 18A one really needs a PSU test jig with appropriate load resistor banks and instrumentation. – Daniel R Hicks Nov 19 '12 at 13:01

You must log in to answer this question.

Browse other questions tagged .