[SI-LIST] Re: DDR2 Signal Probing on SODIMM
- From: "Tom Biggs" <tbiggs@xxxxxxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 22 May 2007 14:43:22 -0700
I like the Tektronix probe holders.=20
http://www.tek.com/site/ps/0,,60-15111-INTRO_EN,00.html
Also, it is possible to use a differential probe even though the signal
isn't differential. Connect the - tip to a nearby ground.
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Alex Horvath
Sent: Tuesday, May 22, 2007 2:08 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: DDR2 Signal Probing on SODIMM
I try to avoid probing DDR signals whenever possible but if I have to
these work wonders even on vertical boards using the vias as signal
contact points. You have to get the adapters for your scope probe model
- obviously the default probe tip they sell is good for DC only!
=20
http://www.agdevices.com/pages/product/qp/qpmain.html
=20
Of course it is extremely difficult to simultaneously ground the 1"
scope probe ground. However, I have done tests comparing the 1" ground,
2" and 3" ground to a nearby soldered post @ 200 Mhz and I did not see a
large difference in signal quality for my purposes. Of course I highly
recommend that you perform your own tests if you use this method.=20
Sharma Rajeev-B01961 <B01961@xxxxxxxxxxxxx> wrote: Hi All, What is the
best way to probe the DDR Signals on SODIMM?Is there any readymade
solution(in terms of Connectors) available to probe the DDR SODIMM
signals?
I am facing issue in probing the signals on SODIMM as the via's are very
small and moreover it becomes difficult to hold the probes on these
vias.
In my attempt I have used some wire straps with Damp Resistors and
soldered them on the vias.But just want to understand if there is some
other better way to do this.=20
Thanks & Regards,
Rajeev Sharma=20
------------------------------------------------------------------
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:=20
//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: =20
//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
=20
------------------------------------------------------------------
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: