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

Hi
Thanks all for the reply.
my AC power is 50Hz.
My confusion is whethre it is just a mesurement problem or the i/p power to
the board is really noisy?
My board is working properly even when scope shows 50Hz, that means it is a
measurement proble??
also please help to find out the exact reason for this to happen.
Thanks & Regards,

Bhavith


On 5/24/07, N. Paul Taddonio < paul.taddonio@xxxxxxxxxxxxxx> wrote:
>
> Is 50 Hz the frequency of your AC power?  It sounds like something is not
> grounded,
> this is a dangerous situation, you have a defective power supply or power
> cord somewhere.
>
> The UART cable is apparently providing the needed ground connection.
>
> Paul Taddonio
>
> ----- Original Message -----
> From: "bhavith" <bhavithmp@xxxxxxxxx >
> To: <si-list@xxxxxxxxxxxxx >
> Sent: Thursday, May 24, 2007 4:58 AM
> Subject: [SI-LIST] Oscilloscope showing 50Hz signal
>
>
> Hi
> 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.
> Thanks and Regards,
> Bhavith
>
>
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