Philip Pemberton wrote:
> Wouter van Ooijen wrote:
>   
>> I would guess this noise originates from the PCs +5V supply, which is
>> probably the direct source of the USB +5V. Have you tried
>>
>> - using the ICD2 without powering the target from the ICD2
>>     
>
> I probably should have mentioned that the target has its own power supply. 
> It's coming from a Farnell Instruments L30B bench PSU. Not the best power 
> supply in the world, but it gets the job done.
>
>   
>> - a powered USB hub between the PC and the ICD2
>>     
>
> I don't have any spare powered USB hubs :(
>
> Thanks.
>   
I think you have the several devices that are used on different branch 
circuits, each one having a different "GROUND"
level. Try moving the mains for all devices to the same branch.

Otherwise, my money is on a defective PC 5V power supply feeding the ICD2.

--Bob
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