Bogert,

The bag neither contributes to nor detracts from the ESD protection
while the assembly is at an ESD workstation and the operator is
grounded.  The item should be placed into the bag before the operator
disconnects from the grounding system to leave the station, and should
not be removed from the bag until the operator has reconnected to the
grounding system. 

Having the bag under the assembly during processing would most likely
violate good housekeeping practices at the workstation - if hand
soldering is being done the hot iron could touch the bag and melt it,
causing residue to accumulate on the tip. If assembly or test operations
are being performed the bag tends to get in the way. 

Blair

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - Bogert
Sent: Saturday, February 03, 2007 2:09 PM
To: [log in to unmask]
Subject: [TN] ESD Question

February 3, 2007

An OEM protects his circuit card assemblies by placing them in an ESD
bag when they are not being worked on or inspected.  My question is if I
remove the assemblies and place them on top of the ESD bag which is
placed on the work surface of an ESD grounded work bench and am
connected to ground via the normal wrist strap, is there a concern if
the assembly is on the ESD bag surface versus the grounded work surface?
If so, what is? the reason?

Some folks have stated the item should not rest on the bag but I cannot
fina any ESD requirement in the 20.20 ESD spec that prohibits this.


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