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CXA 9000A missing RF coupling DC?

Question asked by yavkata on May 20, 2013
Latest reply on May 21, 2013 by MikeM

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I am using CXA 9000A SA with EMC option installed. According to manual, DC coupling should be located in {Input}, [RF input], [RF
coupling DC]. However, [RF input] contains only [Input Z Correction]. Any suggestions?

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MikeM Aug 21, 2014 6:44 PM
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Not all CXA instruments have the AC/DC coupling selection, only the ones with the Option 513 and 526 frequency range. The lower frequency instruments are always AC coupled down to the minimum input frequency.

If there is something in one of the manuals that is either confusing or misleading please let us know so we can correct it.

Best regards,
Mike
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yavkata May 21, 2013 12:49 PM
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Thank you for the timesaving answer. (My instrument is with Option 503 frequency range 9kHz - 3GHz - so it will be constantly AC coupled)..
How does this affect some EMC measurements? I am referring to 5990-3133EN , on p.8 it states that:" The X-Series should be in DC coupled mode." Please, comment.
**ps. Regarding the same document - it states "Select limits, change file type to .Lim, and scroll to the required limit line". I lost precious time investigating why I don't have *.lim files and eventually whether selecting .csv files will put the correct limits that I am interested in.
Thanks for the answers in advance.

Edited by: yavkata on May 21, 2013 1:48 PM
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- MikeM @ yavkata on Aug 21, 2014 6:44 PM
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  You'll be fine with your CXA down to 9 kHz AC coupled. The other X-Series instruments have a limitation of 10 MHz when AC coupled but the lower frequency CXAs have a different input coupling circuit, so they work dwon to 9 kHz. The other X-Series instruments need to switch to DC coupled to make these low frequency measurements.
  
  We also switched over to providing all of the limit line files in .csv file format with software version A.10.00, when we also updated them all and adding many more new ones to the list.
  
  I will ask the writers of the application note you mention to make the needed changes to include this information.
  
  Best regards,
  Mike
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CXA 9000A missing RF coupling DC?

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