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8753D Network Analyzer

Question asked by maxhendrickson001 on Jun 4, 2014
Latest reply on Jun 6, 2014 by Dr_joel
I have a 8753D that has the error 

I have a error A8 Post Reg 70% failure when I run the self test and also errors 21 and 22 fail the test in my 8753D. Other failures are 30%. Where is the Post Regulator located in the schematic? Any thoughts on what can be bad? symptoms are: when I calibrate using 50 ohms at the end of a piece of coax for two different ranges (319 to 320 MHz and 318.5 to 320.5 MHz) and save them, the analyzer reads 50 ohms on the smith chart for both of the calibrations. When I go to test a impedance (1 port) I get very different readings for the DUT using the two calibrated ranges.
Max Hendrickson