TECHNET Archives

November 2005

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Jim Henderson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jim Henderson <[log in to unmask]>
Date:
Tue, 15 Nov 2005 09:28:08 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (25 lines)
Hello,

If there are any impedance testing gurus out there I have a question for
you.  We are testing an edge coupled offset strip line coupon.  We modeled
the stack up to give us 100 ohms differential.  When we test the coupon we
get around 130 ohms.  We have done a microsection of the coupon and modeled
the coupon data and Polar says we should have 105 ohms, within tolerance.
We had a 4 panel lot and it is consistent across the board.  The coupon is
constructed correctly.  My question is, other than what I am seeing on the
microsection should I look for to find the culprit of the high reading?  Any
help would be great.

Jim Henderson
Colonial Circuits

---------------------------------------------------
Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2