What ever the theoretical merit of grounding/not grounding with respect to
metal drawers etc, not grounding allows an element of discretion on handling
ESD. It could be it is better to consistently apply SOP on grounding. It's
small steps between opening the drawer for a peek and then shuffling
contents around to see better, and then taking parts out...
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: Wednesday, May 26, 2010 7:50 PM
To: [log in to unmask]
Subject: Re: [TN] ESD spec question
Graham,
Every place I've worked at had a simple rule - if you are within 3 feet
of an ESD sensitive device, you have to be grounded.
These days, when in the cabinet you can have can contain Class 0
devices, whose threshold is about 250V, you do not want to run the risk
of damaging components by opening the cabinet while ungrounded.
To me, ESD and the X-Files define paranoia. Play it safe - be grounded.
Hope this helps. Good Luck.
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of
[log in to unmask]
Sent: Wednesday, May 26, 2010 12:30 PM
To: [log in to unmask]
Subject: [TN] ESD spec question
Hey TechNet
It's been a quiet day on Technet!
I've got a question regarding ESD. I was taught that if I am not
grounded I do not go near anything that is ESD . The example we are
debating here today concerns parts that are stored in metal cabinets.
The cabinet is grounded, and within the cabinet drawers there are ESD
sensitive parts in individual bins, not covered or packaged (no faraday
cage).
Is it OK to open the drawer and look into the cabinet without being
properly grounded? I say no, but am I being overly cautious?
If "no" is the right answer, where would I find that in an ESD spec?
I've given ESD-S20.20 a quick peruse, nothing jumped out at me.
regards,
Graham Collins
Halifax Production Engineering
(902) 873-2000 ext. 6215
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