How to test Power Supply Voltage and Pinout

I have a Late 2012 iMac, 21.5" EMC 2544. I wanted to see if anyone knew how to test the Power Supply Voltage and what the Pinout was? It looks like there are 6 Pins and 3 are ground and three provide 12v. Just trying to understand how to test this. I have a multi-meter but needed to understand the expectations on what voltage I should be getting.

Thanks.

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