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How to use a multimeter to measure the power line barrier

How to solve the USB device over the power limit problem

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Or, for a question: under what circumstances, the inverter to the inverter motor cable, you can not use shielded cable? Is there a "no need to use shielded cable" basis?
That connector can be used to connect the extension of the power cord, is the three-phase plug, the power cord in the ipad package is standard, but the iphone phone does not need, so no configuration. Whether there is no other use, I do not know.
Integrated wiring strength bridge spacing between the specifications which is written?

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