Re: EMC of sticky tape....

"H. R. Bob Hofmann" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> "Ed Price" <[EMAIL PROTECTED]> wrote in message
news:<[EMAIL PROTECTED]>...
> > "Mike Harrison" <[EMAIL PROTECTED]> wrote in message
> > news:[EMAIL PROTECTED]
> > > Just noticed an interesting phenomenon today.. I was watching a fairly
> >  weak TV signal, while taping
> > > up a  parcel with a handheld tape dispenser - when I pulled some tape
off
> >  the roll, I saw
> > > interference on the TV picture, presumably due to static discharge.
> > >
> > > How long before we see a mandatory emissions standard for adhesive
> > tapes.....?
> >
> > In the world of ESD control, the triboelectric effect you just saw is a
> > common problem. There are special tapes available for production
> > environments that minimize this effect. Beyond that, you can also get
ESD
> > effects from things like rattling the keys or coins in your pocket.
> >
> > Since there are so many ways to create ESD events, it's a good idea to
> > harden electronic devices to withstand a certain level of ESD. And I
believe
> > that EN61000 has a section that addresses exactly that.
> >
> > Ed
>
> Doug Smith, fairly well known in United States EMC circles, has a
> demonstration showing that a few coins in a plastic "baggie" can
> generate a lot of esd effects.  In a totally dark room, you can even
> get a ffluorescent light to flicker.
>
> H. R.(Bob) Hofmann


Yes, I followed up on his demo by putting a several-inch-long whip antenna
on the input terminal of a decent digital storage oscilloscope. With a
baggie of coins a few feet in front of the scope, it's amazing to see the
voltages induced onto even that short antenna. I had posted some waveforms
to the emc-pstc group, but if anyone would like a copy, they can ask me via
email.

Ed