🚀 go-pugleaf

On Jun 25, 11:05 am, Fred Bartoli <" "> wrote:
> John Larkin a écrit :
>
>
>
> > On Thu, 25 Jun 2009 16:31:09 +0800, TonyS <scarboro...@gmail.nspm.com>
> > wrote:
>
> >> John Larkin wrote:
> >>> On Wed, 24 Jun 2009 21:42:07 -0700, <castlebravo...@att.net> wrote:
>
> >>>> "David L. Jones" <altz...@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?)
>
> --
> Thanks,
> Fred.

Is that open end shield rather than opened shield, or am I missing
something here. Grounding one side is pretty common knowledge, though
you get arguments over which side to ground.