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Why is there a peak at 0 Hz on Spectrum Analyzer - RF Cafe Forums
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| Yariv3G
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Post subject: Why is there a peak at 0 Hz on Spectrum Analyzer
Posted: Mon Dec 18, 2006 11:11 am
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Joined: Mon Apr 03, 2006
4:06 am
Posts: 8 |
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Hi,
I am using a spectrum analyzer that has a
measurement range from 9kHz up to GHz. When chosing
a Start freq at 0Hz and span of 100 MHz, I see a
peak from 0 Hz although I don't measure anything
(Open).
Has this something to do with the VBW
Filter?
I have seen this quite often but never
have been asked about this...
Can someone give
me a convincing explaination?
Thanks for any
hint.
Yariv3G
_________________
R&S RF Application
Engineer
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RFTEJerry |
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Post subject:
Posted: Thu Dec 28, 2006 12:46 pm
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Joined: Thu Apr 13, 2006
9:53 am
Posts: 17
Location: Florida
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The response at 0 Hz is due to the Spec-Ana's LO
feedthru. Read Aglient's application note AN150,
Spectrum Analyzer Basics for the details.
Godd luck,
RFTEJerry
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sm7ovk |
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Post subject:
Posted: Sun Jan 14, 2007 3:11 pm
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Joined: Thu Jan 11, 2007
12:59 pm
Posts: 16 |
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Long time ago since I was at school, but isn't the
mathematical explanation that the fourier transform
has "problems" with 0Hz?
Regards
Jens
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CyberOli |
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Post subject:
Posted: Fri Jan 19, 2007 7:55 am
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Joined: Thu Jan 18, 2007
8:09 am
Posts: 12
Location: Belgium
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It's not really a "problem", but the Fourrier transform
of a 0 Hz signal (direct signal) gives a Dirac Pulse
at 0 Hz. If I remember well.
The agilent
document given by RFTEJerry is very good to well
understand the functioning of a spectrum analyzer.
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Posted 11/12/2012
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