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11852B OPT004 Calibration

Question asked by tagmantazy on May 22, 2010
Latest reply on May 22, 2010 by Dr_joel
I have had various advice on the calibration of these items and was hoping someone can help clear up a few points, first of all I have the following equipment:

Network Analyzer Agilent 8753ES OPT 002, 006, 010 (50 Ohm)
N Type Calibration Kit Agilent 85032F OPT 500 (50 Ohm)
N Type Calibration Kit Agilent 85036B (75 Ohm)
Min Loss Pad Agilent 11852B (x2) and 11852B OPT004 (X3)
Various 75 to 50 Ohm adaptors

The 11852B OPT004 I am trying to measure is required at several points between 50 Mhz and 2 Ghz, I need Rho , phase and insertion values for the uncertainty analysis on the power measurements I am conducting.

I was told I could use an un-calibrated 11852B and 11852B OPT004 and carry out an adaptor removal calibration using the 11852B OPT004 as the adaptor, the 11852B as the 50 ohm to 75 ohm min loss pad (to convert to the correct sex/impedance for use with the test 11852B OPT004) and the 2 calibration kits (listed above). This returned good Rho and phase data compared to the original Agilent Certificate (now over 4 years old), but the insertion values (approx 5.7 dB) were variable at best. Is there something I missed?
The second piece of advice I had came from a Calibration Engineer, was that minimum loss pads can be calibrated just using two 1-PORT calibrations, one 75 ohm using an 11852B on the end of the port and one 50 ohm on the other port. I can not find a way the have a 1 Port calibration active on S11 and a separate 1 Port calibration active on S22, is there a way of doing this?
Even then how about the THRU calibration since it is not carried out on either of the 1 Port calibrations, I assume the insertion figures will be garbage.  :?:

Anyone any ideas?  

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