[SI-LIST] Re: Oscilloscope showing 50Hz signal

> I have an issue while probing with oscilloscope,
> When i probe at any point on the board, I am getting a 50Hz signal with 50V
> p-p.
> When i connect the UART cable from PC to the board, scope giving proper
> measurements.
> Can anybody explain the reason for this behaviour of the scope.

Not enough information!

A likely explanation: you don't have a ground lead.  Connecting the cable
establishes the missing ground connection.

Andy


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