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What is floating DC supply?
A floating output is a power supply or DC/DC output that is ungrounded and not referenced to another output. Floating outputs are typically fully isolated and may be referenced as either positive or negative by the user.
How do you find a floating ground?
If a current meter is connected between this FG point and chassis ground, the actual high voltage return current can be measured in a safe ground referenced fashion. Essentially, the analog grounds inside the supply are “floated” up a few volts to allow for this measurement.
Where does the voltage appear on a floating DC power supply?
For floating DC power supplies, the voltage potential appears from the positive output terminal to the negative output terminal. There is no voltage potential (at least, none with any power behind it) from either the positive terminal to earth ground or from the negative output terminal to earth ground.
How is a floating power supply more flexible?
A power supply with a floating output is more flexible since, if desired, either the positive or negative terminal (or neither) can be connected to earth ground. Some devices under test (DUT) have a DC input with either the positive or negative input terminal connected to earth ground.
Why is the power supply output floating from earth ground?
If you are using a power supply without connecting another source from earth ground to one of the output terminals (the output is floating from earth ground), there could be some stray current paths that could produce a voltage from one of the output terminals to earth ground.
How can I check the voltage of my DC power supply?
Turn on your multimeter and set it to read DC voltage. Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug. Take the black (negative) probe from your multimeter and carefully touch it against the barrel of the plug without touching the tip or your red probe.