Connect an XLR cable into your condenser microphone. Plug the other end of the cable into the PS400's "MIC INPUT" jack.
Plug the second XLR cable into the PS400's "MIC THRU" jack. Connect the other end of the cable to your mixer's "MIC" input.
Plug in the PS400 12 V power supply. The "ON" LED will light.
Switch the phantom voltage to +12 V or +48 V, depending on the voltage requirements of your condenser microphone. Check your microphone manual or contact the manufacturer's to find out the correct voltage to use.
Adjust the volume levels and equalization on your mixer as desired.