Re: Puzzle
- From: "Dr.H@l0nf1r£$" <yeah@xxxxxx>
- Date: Sun, 29 Apr 2007 02:31:53 +0100
TMack wrote:
"Dr.H@l0nf1r£$" <yeah@xxxxxx> wrote in message
news:-bmdna9sjoHJoK7bnZ2dnUVZ8tSdnZ2d@xxxxxx
funfly3 wrote:
BigH2K wrote:
"Dr.H@l0nf1r£$" <yeah@xxxxxx> wrote in message
news:sJCdnSsfaalFDa_bnZ2dnUVZ8qSnnZ2d@xxxxxxxxx
SNIP
As far as I'm aware the bag is the same internally as externally :
Anti-static. IMO if the inside were a conducting layer it would
conduct static and fry the mobo before it was ever used.
Look up "Faraday cage." You could safely wrap a motherboard in
aluminium foil if you wanted to.
The whole point of antistatic bags is that they conduct enough
electricity to allow static to discharge safely before it builds up
to dangerous levels whilst retaining the advantages of being a
plastic bag.
Hmm; I've always wondered but I honestly have no idea how they work; just
that they do. if they work on the principle of a Faraday cage then I can
understand that. - However the reverse breakdown voltage of a MOSFET's
junction is incredibly small as the microthin layer between the
electrostatically-acting gate and the substrate/semiconducting layer between
the drain and source is extremely fragile. It doesn't take much voltage at
all, or more current than a few milliamps, to ruin the device totally. - So
if a static charge does build up on a surface there's always the chance of
even a tiny charge ruining the entire device in question by burning out just
1 MOSFET out of thousands or in some cases millions in the device. Whether
the static charge is discharging or not; it still is there and has the
potential to destroy a device. If an antistatic bag has no discharge path
then what? Air discharge by ionisation is slow at best, yet the charge has
to go somewhere. I would say that a nonconducting surface, ultra-smooth to
eliminate friction, would be ideal. However having said that a balloon is
non-conducting yet static builds up easily on its inflated surface. I
believe that there is something about the molecular structure of the
materials used in addition to any conductive properties.
We studied static fairly extensively in college; yet I don't recall any
tutorials on the structure of antistatic bags; only precautions against
allowing static electrical charges building up anywhere.
.
- References:
- Puzzle
- From: Dr.H@l0nf1r£$
- Re: Puzzle
- From: BigH2K
- Re: Puzzle
- From: funfly3
- Re: Puzzle
- From: Dr.H@l0nf1r£$
- Re: Puzzle
- From: TMack
- Puzzle
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