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Author Topic: HP8350B spectral purity concern  (Read 923 times)

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Offline tkamiyaTopic starter

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HP8350B spectral purity concern
« on: August 29, 2018, 07:15:21 pm »
I just purchased an HP8350B with 83525B RF plugin.  This is a sweeper with 0.01 to 8.4Ghz. 

Hooked up to a spectrum analyzer and I got THIS....  I'm a bit surprised with this spectral purity.  For this picture purpose, I have scanning stopped.  It is generating 105Mhz and span is 20Mhz.  Spec Analyzer is HP8590EM

Is this right? 
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Offline rfeecs

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Re: HP8350B spectral purity concern
« Reply #1 on: August 29, 2018, 11:35:36 pm »
Do you have internal modulation turned on?  I seem to recall there was a button to turn on internal square wave modulation for use with a scalar network analyzer.
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Offline tkamiyaTopic starter

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Re: HP8350B spectral purity concern
« Reply #2 on: September 02, 2018, 02:44:02 am »
No, but I left the unit with a local cal house.  Tech stated it is now functioning as it should.  Thank you for taking your time to reply.
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