The EX2020R is an exceptionally compact and lightweight single output laboratory dc power supply providing 0 to 20V at 0 to 20A. The EX2020R uses mixed−mode regulation technology which combines switch−mode pre−regulation with linear post−regulation. Special techniques are used to maintain very high efficiency whilst achieving noise levels that are close to that of a pure linear regulator. Excellent line and load regulation are matched by low noise and good transient response. High resolution controls allow accurate setting of voltage and current levels. Remote sense terminals are provided so that good regulation can be maintained across remote loads at high currents. The output operates in constant voltage or constant current mode with automatic cross-over and mode indication. There is a DC output on−off switch. The EX series incorporates separate digital voltage and current meters on each output. The meters use bright 14mm (0.56”) LED displays and have an update rate of 4 per second providing near instantaneous response. Simultaneous metering of voltage and current provides accurate information “at a glance” and avoids any possibility of misinterpretation. When the output switch is set to “off”, the current limit setting is displayed enabling conditions to be set before the load is connected. The EX series has been designed to meet the stringent requirements of the latest relevant IEC standards for safety and EMC, including harmonics emissions. All outputs are intrinsically short circuit proof, and are protected against external voltages and reverse currents.