The EL302P is a digitally controlled version of the standard EL302 linear power supply with an isolated RS-232 interface. It offers a low-cost solution for a basic programmable PSU, and will be sufficient for many applications where the sophistication and complexity of GPIB is not needed. A simple command set allows remote control of voltage, current and output enable together with read-back of metering values and operational status. Local control is via three rotary encoders providing rapid and accurate setting of voltage and current during bench use. Excellent line and load regulation is matched by very low noise and good transient response. Improved power efficiency ensures that the units require no fan cooling. The EL series has been designed to meet the stringent requirements of relevant IEC standards for safety and EMC. All outputs are intrinsically short circuit proof and are protected against external voltages and reverse currents.