A source measure unit (SMU) is an electronic instrument that is capable of both sourcing and measuring voltage and/or current at the same time with high precision. They typically provide source and sink capabilities (two-quadrant), some of them even span voltage and current across both positive and negative values (four-quadrant). Two/four quadrants: operates as source and sink High speed data acquisition (FastLog function) Voltage priority and current priority mode High-capacitance mode Fast load regulation 500,000 samples per second up to 6 1/2 digits Galvanically isolated Floating channels 60 W output power