Question Voltages go down after a minute

KantaSlaus

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Dec 26, 2015
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After having some problems I'm testing my PSU voltages with a multimeter. At first all the readings came out as expected, I left it for a minute to check my phone and when I came to continue it would start the reading at 40 or so, and then go down to 0.5 or so. Also when connecting two blacks it would not zero anymore.
Did I do anything wrong or is this thing busted?
 

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