Hello Alan,

Something that I do that may help at incoming inspection;
I put a small stackup window right on the edge of the board with each layer numbered.
You can hold the board up to the light and actually see the layer stack order through this window (plane layers require clearance windows so that this will work) In addition to this, small, unconnected copper traces can be placed on this edge so that they will be exposed on the edge of the board when it is routed - you can actually measure the thicknesses of each layer with this method (I have to credit Rick Hartley for this idea)

regards,

Phil.

-----Original Message-----
From: Alan Berni [mailto:[log in to unmask]]
Sent: Thursday, 10 July 2003 9:17 PM
To: [log in to unmask]
Subject: [TN] Board Stackup fabrication errors


To all,

We have, from time to time, received boards that have been build with an error in the stackup layer order.  Our documentation is clear but it seems to be a manual process with Fab vendors.

1. What electronic formats can transfer and/or verify that the stackup is done correctly at the Fab vendor?

2. What methods are available to verify the board stackup is correct at incoming inspections (layer markings, coupons, cross sections)?

Regards,

Alan Berni

Applications Engineer
Symbol Technologies, Inc
One Symbol Plaza
Holtsville, NY 11742-1300

Phone:        631-738-4364
Fax:             631-738-3318
Email:          [log in to unmask]
Website:     http://www.symbol.com

________________________________________________________________________
This email has been scanned for computer viruses.
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------