Aim tti twin 420 powerflex power supply aim tti cpx400d p the aim tti cpx400d 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 aim tti cpx400d power flex design enables higher currents to be generated at lower voltages within an overall power limit envelope br each output can prov