I am trying to take a differential impedance measurement on a 10' length of cable using a 4396B and 85046A S param set. I am using a 50 ohm coax off the port one to a 50:100 BALUN. The wires of the twisted pair being tested are connected to ports A and B of the BALUN.

I have completed the S11 port calibration (open/short/load) using a 100 ohm resister across ports A and B of the BALUN.

I am viewing the results in the Smith chart format with my marker set at 1 MHz. The 4396B is giving me three measurements at my marker. The first two are in ohms and the third is capacitance.

I am not sure how to verify I am getting accurate results. I don't have a sample of known values to test. The impedance of this cable was measured on a LF Impedance analyzer and found to be 106 ohms. Can I use this to verify my differential measurement results?

Thanks for helping a newbie!

I have completed the S11 port calibration (open/short/load) using a 100 ohm resister across ports A and B of the BALUN.

I am viewing the results in the Smith chart format with my marker set at 1 MHz. The 4396B is giving me three measurements at my marker. The first two are in ohms and the third is capacitance.

I am not sure how to verify I am getting accurate results. I don't have a sample of known values to test. The impedance of this cable was measured on a LF Impedance analyzer and found to be 106 ohms. Can I use this to verify my differential measurement results?

Thanks for helping a newbie!