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Flatness adjustment not possible any more on hP / Agilent 8564E
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hafrse:
Hello,

I am trying to adjust the flatness on my 8564E but did not work:

If I choose a band  #3 and try to adjust the DAC at the specific frequency 12.4Ghz , previous  DAC value was 3501 , if I change to 3256 and can see the trace within the flatness menus  at the wanted level , save and exit. 
Now measuring the same frequency @12.4Ghz still shows level value which was on DAC 3501! going back to the flatness cal menu and set back band #3 12.4Ghz , the level is correct within that menu  and the DAC value is 3256 (the new value) .
I tried values like 100 and 4995 , DAC value will be saved but trace still the same at 12.4Ghz.  any clue what that can be?

However,  in the low band mixer (9kHz-3GHz)  it is possible to adjust and see the results without any problems.

Where do I find the flatness compensation DAC  ?

Thanks for any advice!
George
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