[SI-LIST] Re: AW: Control Impedance testing
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Steven Salkow" <steven.salkow@xxxxxxxx>, "Gert Havermann" <Gert.Havermann@xxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Sat, 12 Sep 2009 10:01:57 -0700
It's much more reliable to build test traces right into the PCB. That way,
impedance can be checked anytime. Very easy to do.
Lee Ritchey
> [Original Message]
> From: Salkow, Steven <steven.salkow@xxxxxxxx>
> To: Havermann, Gert <Gert.Havermann@xxxxxxxxxxx>; si-list@xxxxxxxxxxxxx
<si-list@xxxxxxxxxxxxx>
> Date: 9/11/2009 5:39:54 PM
> Subject: [SI-LIST] Re: AW: Control Impedance testing
>
> Coupons are a practical way to audit Trace impedance. There should be
test coupons for every signal layer and every different type: i.e.
differential and single ended as required. Most fabricators can now
generate the test coupons too. If going this way, have them serialised same
as board and note lot codes for tracking. See IPC 2221/2222 for more info.
Your fabricator knows all about this - ask for a run down.
>
> Steven Salkow
> Lockheed Martin
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Havermann, Gert
> Sent: Sunday, August 30, 2009 11:54 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] AW: Control Impedance testing
>
> Dear Liao,
>
> there are some PCB maker out there with the capability and willingness to
test all, or selected traces of your board. Of coarse you have to pay for
this service, as well as you have to pay for very tight impedance control.
For mass production this is not the way to go. You have to make shure that
the design works within all production variations. For special test cards,
thats another story. We found a PCB maker in Germany for such test boards,
and they guaratee a 6% tolerance for prototype volumes and test most of the
traces. Unfortunately, they can only test single ended, thus you have to
specify both impedances, and they will only guaratee the single ended to
come out right.
>
> Let me know if you would like the contact data.
>
> BR
> Gert
>
>
> --------------------------------------------------------------------------
> Absender ist HARTING Electronics GmbH & Co. KG; Sitz der Gesellschaft:
Espelkamp; Registergericht: Bad Oeynhausen; Register-Nr.: HRA 5596;
persönlich haftende Gesellschafterin: HARTING Electronics Management GmbH;
Sitz der Komplementär-GmbH: Espelkamp; Registergericht der
Komplementär-GmbH: Bad Oeynhausen; Register-Nr. der Komplementär-GmbH: HRB
8808; Geschäftsführer: Torsten Ratzmann
> -----Ursprüngliche Nachricht-----
>
> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
Im Auftrag von BO-LIAO
> Gesendet: Sonntag, 30. August 2009 14:09
> An: si-list@xxxxxxxxxxxxx
> Betreff: [SI-LIST] Control Impedance testing
>
> Dear Sir,
>
> My PCB supplier doesn't test control impedance on actual board. They said
control impedance is measured on test coupon.
>
> Please advice if it is realistic and reliable to use the test coupon
measured impedance?
>
> Is this an industry norm, or standard?
>
> Thank you.
>
> Best regards,
> Liao Bo
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
