TECHNET Archives

June 2000

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Ryan Grant <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 16 Jun 2000 15:10:10 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (125 lines)
I will admit,
        The last place I worked, we worked with pyrotechnics
(non-technically, "explosives").  Of course, ESD discharge was a BIG
concern.  Especially since the pyro would draw water out of desiccant, so
operating environments were kept at very low humidity levels (10 - 20 %).
We were not worried about latent field failures or low yields.  We were
worried about our own safety.

HOWEVER, our smocks were NOT ESD smocks.  (They were burn smocks). We did
NOT have ESD shoes, the floor was NOT made with conductive tile, we did NOT
have area ionization and we did NOT have conductive seats.  We did follow
ANSI/ESD requirements and had an unmarred safety record.

But as Paul pointed out, the unmeasureable subjective appearance is just as
valuable.  It is much like cleaning your car just before selling it.  It
doesn't mechanically improve the car, but it sure makes the customer think
the car is more mechanically sound.  Even us savvy engineers fall for this
sneaky trap.  Admit it, when we go into a shop that is impeccably clean, we
automatically think they know what they are doing, and doing it well.

We wear smocks at our company, and button them up, because we deal with
customers who come into the shop.  We also DEMAND that our suppliers wear
smocks, and button them up for the same misguided reasons.  For this reason,
I can't foresee very many companies breaking the mold discontinuing wearing
ESD smocks, or buttoning them up.

Thanks

Ryan Grant
Advanced Technology Engineer
MCMS
(208) 898-1145
[log in to unmask]



> -----Original Message-----
> From: Gary Camac [SMTP:[log in to unmask]]
> Sent: Wednesday, June 14, 2000 2:55 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] ESD Coats
>
> ...and according to ANSI/ESD-S20.20-1999 you are required to have:
>
> Equipment Ground
> Common Point Ground
> Wrist Strap System - on seated operations
> Signs
> ESDS Item packaging
> You must have an ESD Control Program Plan
> You must do training (initial and recurrent)
>
> I see no requirements for wearing smocks, heal straps, conductive
> footwear, area
> ionization, conductive seats .... These are considered optional elements.
>
> Am I missing something here?  The subject of open or closed smocks has
> been passed around
> a lot in the last couple of months.  And overtime someone stands up and
> says, " ya but,
> all the studies say that the wrist strap is all you really need.  Are the
> smock guys just
> wearing a belt and suspenders, i.e., being cautious?
>
> I can see that if you have a multifaceted attack, you have room for one
> element to fail
> and still have back-up.  But where do you stop?
>
> Gary Camac
>
> Paul Signorelli wrote:
>
> > ESD Protection has 2 elements and BOTH must be satisfied:
> >
> > First is the 'Objective' evidence; e.g.: The static field
> > from a person who doesn't have his top button snapped
> > maybe xx volts and totally acceptable.
> >
> > Second is the 'Subjective' appearance (Feelings - No data);
> > e.g.: Even though the field meter says the smock is protecting the ESD
> > sensitive item, the auditor doesn't consider that because he just
> > doesn't like it or because the procedure doesn't allow it.
> > You have to be very careful when writing your ESD
> > procedures.
> > Check out the new ANSI/ESD-S20.20-1999 ESD Standard for Protection of
> > Electrical and Electronic Parts/Equipment. It is available free on the
> > Web.
> > http://www.esda.org
> >
> > Sometimes you have to ground things that don't need to be grounded.
> >
> > Paul Signorelli
> > NARTE ESD Certified Engineer
> >
> > ##############################################################
> > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> > ##############################################################
> > To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> > the body:
> > To subscribe:   SUBSCRIBE TECHNET <your full name>
> > To unsubscribe:   SIGNOFF TECHNET
> > ##############################################################
> > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> > information.
> > If you need assistance - contact Keach Sasamori at [log in to unmask] or
> > 847-509-9700 ext.5315
> > ############################################################## << File:
> Card for Gary Camac >>

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################

ATOM RSS1 RSS2