What is a source-sink?

We use the term source-sink for 4-quadrant power supplies – these are devices that allow both current and voltages in both positive and negative directions.

A 2-quadrant power supply is also a source-sink. Another term for these devices is bi-directional power supply because current can flow both out of the device (source) and into the device (sink). The QL series offers 2- and 4-quadrant models in a wide range of power and with many features.