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January 2009

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Thu, 22 Jan 2009 14:20:00 -0600
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For Military or High Rel work I would be strongly tempted to look at
EOS/ESD 20.20-2007, except make at least some if not all of the Optional
requirements be Required, else you don't have the whole package there to
ensure that if any one element fails (ESD training and certification,
grounded workstations and shelves, grounded operator, ESD smock,
conductive floor, environmental controls, etc.) you will probably not
harm the CCAs because the rest of the elements are still in place. It
gives you an option to not have to perform containment action if one
part of the system fails. For example, if it is discovered that a single
bench has a defective ground connection during the monthly testing, but
the operators are required to wear ESD shoes and ESD footstraps and
check them daily with few or no failures noted, and engage a Continuous
Monitor attached to their wrist and the monitors were all working, they
all were observed wearing their smocks, the smocks are of the type that
have conductive elastic wrist sleeves, the operators are trained to not
wear hoodies outside of the smock or orange cat hair sweaters, the
humidity was controlled and charted and did not drop below 20% during
that timeframe (since the last bench check, which would be a maximum of
30 days), and the last quarterly report shows that the floor
tribolectric charge test and the connection from the floor to the
building ground passed, and nobody tied two or three giant Mylar
balloons filled with helium that said "Happy Retirement, Mabel!" to any
operator's benchtop mat connector, then the probability of all the other
systems negating any potential issue with the single ungrounded
workbench justifies no further containment action is necessary. Pretty
much the same with 1686C, I think.
But 20.20-2007 with Options is just too risky, although it may make
perfect sense for building commercial product.
The other factor is whether or not any Class 0 parts are present,
military or commercial. If so, then you pretty much have to go with
every element, including ionizers, where needed.

And no pink poly! Join the effort to do away with pink poly altogether.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, January 22, 2009 8:59 AM
To: [log in to unmask]
Subject: [TN] ESD standards

Good morning all, 

A quick question.  Hypothetically, if you wanted to avoid writing an ESD
control program, and use an industry standard, what would that standard
be?

Doug Pauls
Rockwell Collins

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