I believe IPC-2140 is now known as IPC-2141.  This covers Controlled
Impedance; Design, Materials, Fabrication & Test.

Andy Burkhardt
[log in to unmask]

At 17:48 11/04/96 PDT, you wrote:
>
>Text item: 
>
>Try IPC-2140
>
>
> 
>
> Does IPC have a standard for Controlled Impedance Testing.
> Something on the order of IPC-TM-650 to define how
> TDR measurments are made not how to design for controlled impedance.
>
> Larry Sternig
> [log in to unmask]
>
>Text item: External Message Header
>
>The following mail header is for administrative use
>and may be ignored unless there are problems.
>
>***IF THERE ARE PROBLEMS SAVE THESE HEADERS***.
>
>Resent-Sender: [log in to unmask]
>Precedence: list
>X-Loop: [log in to unmask]
>X-Mailing-List: <[log in to unmask]> archive/latest/3405
>Resent-From: [log in to unmask]
>Resent-Message-ID: <"ADwnZ1.0.oW8.l1ORn"@ipc>
>To: [log in to unmask]
>Subject: Controlled Impedance
>From: "LARRY A. STERNIG" <[log in to unmask]>
>Message-Id: <[log in to unmask]>
>Date: Thu, 11 Apr 1996 17:03:48 -0500
>Old-Return-Path: <[log in to unmask]>
>Resent-Sender: [log in to unmask]
>Received: by ipc.org (Smail3.1.28.1 #2)
>     id m0u7UNX-00008mC; Thu, 11 Apr 96 16:58 CDT
>Resent-Date: Thu, 11 Apr 1996 18:40:28 -0700
>Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI)
>      id SAA14530; Thu, 11 Apr 1996 18:40:28 -0700
>Received: from simon.ipc.org (IPC.ORG [168.113.24.64]) by ormail.intel.com
(8.7.
>4/8.7.3) with SMTP id QAA14595 for <[log in to unmask]>; Thu,
11 Ap
>r 1996 16:43:01 -0700 (PDT)
>Received: from ormail.intel.com by relay.hf.intel.com with smtp
>     (Smail3.1.28.1 #2) id m0u7W10-000qDQC; Thu, 11 Apr 96 16:43 PDT
>
>
>