The TM 5003 is a three compartment power module compatible with TM 500 - 5000 series plug-ins. The power module features a pulse width modulated switching dc power supply. All dc voltages are regulated. The unit has forced air cooling. Three individual connectors, one for each compartment, provide connections to each GPIB compatible plug-in. These connectors feed to a GPIB interface board, then to a standard GPIB connector on the rear panel. All GPIB connections are separate from the board rear interface connector.