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Do-It-Yourself (DIY) Question & Answer Forum
Floating 90v AC
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<blockquote data-quote="Doc Hudson" data-source="post: 474819" data-attributes="member: 1607"><p>I am assuming what you refer to as the outer case of the USB plug is a non-conductive, plastic-type enclosure? If so you are not reading anything between anywhere. To measure a potential difference you require two points to put your meter probes onto, from what I read you have one probe on electrical earth and the other probe not connected to anything with a conductive surface, (outer case of USB PSU), therefore it is just floating open circuit with no means for your meter to calculate anything of any significance. </p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 474819, member: 1607"] I am assuming what you refer to as the outer case of the USB plug is a non-conductive, plastic-type enclosure? If so you are not reading anything between anywhere. To measure a potential difference you require two points to put your meter probes onto, from what I read you have one probe on electrical earth and the other probe not connected to anything with a conductive surface, (outer case of USB PSU), therefore it is just floating open circuit with no means for your meter to calculate anything of any significance. Doc H. [/QUOTE]
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Floating 90v AC
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