[SI-LIST] Re: Impact of Probe -TDR Measurement
- From: Richard Jungert <r_jungert@xxxxxxxxxxx>
- To: p gundala <pgundala2001@xxxxxxxxx>, si list freelist <si-list@xxxxxxxxxxxxx>
- Date: Mon, 13 Jul 2009 06:46:49 -0700
Padma
You may want to consider adding a test connector to your design and put it
right onto the circuit board. Lets find a connector that works with your probe
and simply add it. It makes for ease of testing in the future.
Richard Jungert
> Date: Sun, 12 Jul 2009 21:52:44 -0700
> From: pgundala2001@xxxxxxxxx
> Subject: [SI-LIST] Impact of Probe -TDR Measurement
> To: si-list@xxxxxxxxxxxxx
>
> Hi ,
>
> I'm making Characteristic Impedance measurements using TDR , of a connector
> soldered to a test fixture. I'm using a Single ended probe . I find that at
> the point of contact of probe on the pad, there is a inductive impedance
> approx. 78-82 ohms , Intially I thought I was measuring the impedance of the
> connector, and then realised I was wrong.
> I then tried to solder a co-ax cable to the pad . It is still shows a high
> inductive impedance depending on the amount of solder at the joint.
>
> Has anyone come across this? Do I need to look into the details of the probe
> rating , bandwidth?
>
> Thanks
>
> Padma
>
>
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