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...HP8593E phase noise intermittent problem

Question asked by FM on Feb 23, 2008
Latest reply on Feb 25, 2008 by Frank_BR

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I have a problem on my 8593A spectrum. In a SPAN smaller then 100 KHz, I can see that the phase noise is increasing sporadically. Its look like phase noise hit on the VCO, like the DC supply of the YIG is not so clean.
Is somebody could tell me where to look? Is it worth for me to investigate or there is no hope?

Thank you

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Frank_BR Feb 23, 2008 4:44 PM
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I suspect your problem is caused by bad contact in the shielding because of oxidation or loose screws. Many N1996A had similar problems, including mine. The fact that the problem appears sporadically is a strong indication of a bad contact. Try to hit (carefully and with moderate force, please!) each shield and module with a plastic rod to see if the spikes on the screen vary with the vibration.
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FM Feb 24, 2008 5:41 AM
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I will open it and verify all connection (ground too) and see if there is something loose somewhere.
Is somebody know the part # of the YIG and what is the frequencies range?
Thank you
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Frank_BR Feb 25, 2008 3:52 AM
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The document below has component-level information for the 8590 series, (but not for the YIG oscillator and the first converter, sadly):

http://cp.literature.agilent.com/litweb ... 3-2591.pdf
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...HP8593E phase noise intermittent problem

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