I own an inexpensive lab power supply. I do not know whether the supply is a single quadrant or dual quadrant.
What would be the best way (without reverse engineering or extensively disassembling) to test if the supply is one or two quadrant?
I have pulled the cover to look inside the supply and there are two transistors attached to the heat sink. I'm trying to figure out whether they are in parallel to give the supply more capacity (this would make it single quadrant). Or if one will source current and the other sinks current (this would make it dual quadrant).
The dual quadrant supply can both sink and source power.