Yes, the important thing is not necessarily that everything is to be
"grounded", but that everything is at the same potential. 
When you wave around a big charge near some wires you will induce a voltage
in those wires.
The big charge can be you at one potential and the wire can be the
connection to Inge's 1.5V gate at another potential.
In order to make sure there is no damage, protect the device with a Faraday
cage (metalized bag, metalized box, etc), and make sure you and the bag/box
are at the same potential before opening it.

That requires thinking before acting, which is not always easy. To make it
easy, ground everything in sight. A ground strap on you and store the bag in
a grounded cabinet.

Regards,
Ahne. 

PS: when you hand a sensitive part to a person not grounded, shake hands
with the empty hands first.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Thursday, May 27, 2010 11:15
To: [log in to unmask]
Subject: Re: [TN] ESD spec question

Basics: there is always a potential difference between two objects.  Only 
exception : if they are galvanically connected to each other.

So, if one object is in a Farady cage, the pontential difference remains.

Dramatic example: 
http://www.youtube.com/watch?v=9tzga6qAaBA&feature=related

If one considers that we work with 1.5 volt gates today,  it's better to 
exaggerate the safety routines, than to let 'experienced' people have their 
own rules.

my two microvolts

Inge



--------------------------------------------------
From: "Graham Collins" <[log in to unmask]>
Sent: den 26 May 2010 18:30
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
>
> This message and any attachments are solely for the use of the
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>
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>
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