TECHNET Archives

1995

TechNet@IPC.ORG

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

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

Print Reply
Received:
by ipc.org (Smail3.1.28.1 #2) id m0t6fp0-0000HIC; Sat, 21 Oct 95 10:26 CDT
Encoding:
902 Text
Old-Return-Path:
<miso!hadco.com!tcoyle>
Date:
Fri, 20 Oct 95 22:02:40 EST
Precedence:
list
X-Loop:
Resent-Sender:
X-Status:
Status:
O
X-Mailing-List:
<[log in to unmask]> archive/latest/46
From [log in to unmask] Sat Apr 27 15:
10:37 1996
TO:
Return-Path:
Resent-Message-ID:
<"nsFQC.0.wxF.y4HYm"@ipc>
Subject:
From:
Resent-From:
Message-Id:
Parts/Attachments:
text/plain (19 lines)
          I can think of a few good reasons for having coupons.  The
          most striking one is that it allows for process/product
          checks without destroying a perfectly good board.  A
          cross-section of a coupon designed to the same parameters of
          the circuit board and placed on the panel should closely
          reflect what a cross-section of live product would look
          like.  Another good application is with measuring controlled
          impedance.  Today's designs make it very difficult to do a
          good TDR test.  Ideally, a 4" to 6" trace with no treeing or
          branching makes for the best test.  These are not always
          evident on board designs, but a coupon can be designed that
          way.  I hope this helps.
          Regards,
          Tom Coyle
          Field Services Engineer
          HADCO Corporation



ATOM RSS1 RSS2