[SI-LIST] Impact of Probe -TDR Measurement
- From: padma gundala <pgundala2001@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 12 Jul 2009 21:52:44 -0700 (PDT)
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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