🚀 go-pugleaf

Fred Bartoli wrote:
> John Larkin a �crit :
>> On Thu, 25 Jun 2009 16:31:09 +0800, TonyS <scarborofun@gmail.nspm.com>
>> wrote:
>>
>>> John Larkin wrote:
>>>> On Wed, 24 Jun 2009 21:42:07 -0700, <castlebravo242@att.net> wrote:
>>>>
>>>>> "David L. Jones" <altzone@gmail.com> wrote in message 
>>>>> news:h8B0m.53620$FI5.3564@newsfe12.iad...
>>>>>> Check out a rather unusual phenomenon you can see on your 
>>>>>> oscilloscope in my latest blog (#14):
>>>>>> http://www.alternatezone.com/eevblog/
>>>>>> See if you can get it to happen on your scope!
>>>>>> I'll offer a free subscription to my blog for the best screen shot 
>>>>>> posted :->
>>>>>>
>>>>>> Oh, and the probe doesn't have to be shorted either.
>>>>>>
>>>>>> Have fun.
>>>>>> Dave.
>>>>>> -- 
>>>>>> ================================================
>>>>>> Check out my Electronics Engineering Video Blog & Podcast:
>>>>>> http://www.alternatezone.com/eevblog/
>>>>>>
>>>>>>
>>>>> When I worked a Century Data we had a problem with our new reel to 
>>>>> reel vaccuum column tape drive when ever someone would walk by the 
>>>>> drive when it was reading it would get data errors. The problem was 
>>>>> that the shield on the cable from the heads to the preamp was 
>>>>> grounded on both ends.
>>>>>
>>>>> Bob
>>>> That's usually the best way to ground shields.
>>>>
>>>> John
>>>>
>>>>
>>> IIRC head signals mostly went via twisted pair. If they had a shield 
>>> as well we would certainly not ground them on both sides.
>>>
>>
>> You *want* large amounts of high-frequency common-mode noise?
>>
> 
> Probably. Lots of people don't understand this and I've seen this kind 
> of mistake (opened shield) recommended in lots of highly regarded EMC 
> books.
> 
> But that's really nice for us. (Joerg?)
> 

Yeah! But shhht, don't spill the beans here, at least not until I am 
retired :-))

-- 
Regards, Joerg

http://www.analogconsultants.com/

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