How to make floating / isolated measurement & break GND loop
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This video explains and demonstrates the formation of the ground loop, its adverse impacts and different ways (e.g. using a USB isolator) to break it in measurements using a USB oscilloscope.
[youtube]http://www.youtube.com/watch?v=0Vo2u11V3fU[/youtube]
[youtube]http://www.youtube.com/watch?v=0Vo2u11V3fU[/youtube]