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May 2000

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Subject:
From:
"Cash, Alan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 22 May 2000 18:11:37 -0400
Content-Type:
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An FR4 pallet is an insulator.  If it is charged with 900 volts you can
induce a charge on the conductors of the pcb installed in the pallet.  This
may damage your sensitive components being assembled onto or into the PWB.
A grounded object touching the copper conductors will bleed off the induced
charge on the conductors, possibly causing an ESD event and possible damage
to your sensitive components.  An insulator can have its charge neutralized
by an ionizer or time, but you can't charge or discharge an insulator, ask
your EE's.  An insulator can acquire a charged field. Check with your ESD
"Guy" for corrective measures appropriate for your process and products.

Al Cash

-----Original Message-----
From: Larry Koens [mailto:[log in to unmask]]
Sent: Monday, May 22, 2000 2:10 PM
To: [log in to unmask]
Subject: [TN] Pallets


I have a question for you ESD guys!

Our company uses board pallets made out of FR4, G10. Our ESD guy came up
with his meter and measured a pallet. It read 900 volts. My question is,
what makes this pallet different then a normal PCB? What makes a PCB bleed
off when this pallet doesn't. Does the copper layers make this happen?

Larry

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