[SI-LIST] Re: DDR2 Signal Probing on SODIMM

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



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