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O atx pg power good value display operation important 1 you must only connect one of the three 525 35 or a sata power connector to the unit at any one time 2 your atx power supply must not be powered when connecting and disconnecting any of the connectors 1 once all power connections have been made switch on the power. View and download ultra products atx power supply user manual online 600 watt atx power supply atx power supply power supply pdf manual download. Pc build manual part 1 12 figure 16 multimeter a power supply tester is used to test how well a computer power supply is functioning both tools can be used to test if a power supply should be replaced or not figure 17 power supply unit installing the cpu now it is time to install the cpu the central processing unit is the main processor in the computer. Testing a power supply manually with a multimeter is one of two ways to test a power supply in a computer a properly executed psu test using a multimeter should confirm that the power supply is in good working order or if it should be replaced these instructions apply to a standard atx power supply