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DC BIAS and NA TDR

Question asked by SOLT_guy on Aug 11, 2011
Latest reply on Aug 12, 2011 by SOLT_guy
Dear Sir:

     I own a 8753C network analyzer.

     I would like to use my NA to experiment with active devices that require a DC bias while my TDR transforms are enabled.

      The 8753C manual asserts that the operator should use the TDR transforms on cables and makes no references to active devices.

      I am theorizing that the DC bias may invalidate my TDR data but I am uncertain because I looked at my TDR signals with an oscilloscope and they look nothing like the traditional TDR signals that one would observe in a textbook.

      Can you tell me whether my data is invalid if I add a DC bias to a TDR transform signal such as a step response?

       Thank you for your time and efforts.  

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