I'm trying to use a Tektronix TTR506A to measure the impedance of a DC bus bar. I have DC blocks in place, and connected to the bus bar in a 2-port configuration. What are the correct formulas to use to transform the S-parameters to a simple resistance over frequency plot?

  • \$\begingroup\$ What range of impedance? \$\endgroup\$ – Sunnyskyguy EE75 Aug 15 at 2:01
  • \$\begingroup\$ What are the dimensions of the bus bar and what range of frequencies do you want it to carry? \$\endgroup\$ – The Photon Aug 15 at 3:18
  • \$\begingroup\$ "Simple resistance over frequency plot"? How much do you realy know about rf networks and s-parameters? What makes you think that the s-parameters that you measure CAN just be modeled as a real resistance? It cant.. It is obvious to me that you are going about this in the wrong way, I have had to do similar measurements in the past a'd this is not how you do it.. I could provide information on how to do this properly, but then I would need to know a lot more about your specific circuit and measurement needs. \$\endgroup\$ – Vinzent Aug 15 at 5:55
  • \$\begingroup\$ @Vinzent - I’m wondering if the OP is referring to single-port |Z| vs. frequency plots. \$\endgroup\$ – joribama Aug 15 at 6:06
  • \$\begingroup\$ Take one step back and ask - why are you trying to measure the impedance of a DC bus bar? Is it for RF isolation between two blocks it's supplying, or for the voltage drop at the far end when it draws RF current, or the voltage drop at the far end when it draws DC, or another criterion I have missed? \$\endgroup\$ – Neil_UK Aug 15 at 7:56

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