... ,+5V Stand by (SB) 12V power Good ( PG )Voltage source : 20/24 pi Power Supply Tester The SD power supply tester is a robust voltage ... jack of the power test suite Power on the supply of power,will hear (DuDu" ring,if no flicker then the power supply output voltage is ... 3V,5V stand by (SB) 12V power good(PG) Connectors:floppy,HDD,CDROM,SATA,4pin(P4),8pin(Dual-CPU),6pin(PCI-Express) power supply tester