Aim tti 420w powerflex single power supply aim tti cpx400sp p the cpx series is a different type of laboratory power supply designed to meet the need for flexibility in the choice of voltage and current a conventional psu has a fixed current limit giving a power capability that reduces directly with the output voltage the tti powerflex design of the cpx series enables higher currents to be generated at lower voltages within an overall power limit envelope p p each output c