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Question about Impedance Calculation

Question asked by garypang on Dec 13, 2010
Latest reply on Dec 17, 2010 by Dr_joel

We are doing a test on a transistor using PNA-L N5230A and Precision Semiconductor Parameter Analyzer 4156C.
My PNA's port 1 and port 2 are connected to 2 probes which connected to the DUT.
By looking at the S11 and S22, we can identify the reflection of each port and calculate the impedance.

At the same time, we are using the 4156C to measure the IV curve of the DUT. Can we actually compare the resistance (from the IV curve measured by 4156C and the resistance (the real portion of the impedance calculated from S11 at low frequency)? Or else, is there anyway we can compare the resistance measured by both equipments?

Really hope that someone can help in this matter.

Thank you.