[SI-LIST] Impact of Probe -TDR Measurement

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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