The 2304 High-Speed Power Supply provides both voltage control and power consumption monitoring for automated testing of portable, battery-operated devices. It is optimized for testing battery-operated, wireless communication devices such as cellular phones that undergo substantial load changes for very short time intervals. The 2304 exhibits outstanding voltage stability during pulse load changes and can simultaneously measure load currents, even if they are short pulses. In addition, it can sink current and, thus, take on the characteristics of a discharged, rechargeable battery for testing chargers and charger-control circuitry. The 2304 is rated for up to 20 VDC at 5 A and is programmable via an IEEE-488.2 interface.