How is accurate voltage measurement made in a float control system?

How is accurate voltage measurement made in a float control system?

A floating measurement reads the voltage between two points, neither of which is at ground potential. True and complete isolation of the measurement instrument from the ground connection of the unit-under-test is essential. Only then can the instrument produce accurate and repeatable ungrounded measurements.

What is a floating voltage source?

A floating voltage source is a voltage source that neither of its terminals is connected to the reference node. Assign voltages to other nodes. These node voltages are referenced to the reference node.

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 measurement of a voltage read?

A floating measurement reads the voltage between two points, neither of which is at ground potential. Floating measurements of fast AC signals are a challenge for conventional instruments.

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 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.