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Guest
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 Posted: Mon Jan 21, 2008 9:07 pm Post subject: Error in spectrum window |
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When doing spectrum analyze on a sine wave I get different level depending on the setting on the bandwith. Very strange. I'm talking about 5-10% or so.
Is this a known problem?
I'm running the latest (I think) Picoscope6.
Thanks in advance!
/Peter |
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PeterF
Site Admin
Joined: 07 Jun 2007
Posts: 117
Location: Cambridgeshire
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| Posted: Tue Jan 22, 2008 11:28 am Post subject: |
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Hi,
There will be some variation when the bandwidth is changed. The most accurate readings will be when the measured frequency is just below the upper range of measurement (a full scale reading). At higher bandwidth settings, when the peak is only a fraction of the full bandwidth, accuracy will suffer. The number of frequency bins selected will also have an effect.
PeterF. |
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Audioguy
Super User
Joined: 09 Aug 2007
Posts: 22
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| Posted: Wed Feb 06, 2008 11:12 am Post subject: |
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Thanks!
I was aware of the relationsship between FFT points and frequency of sampling.. must have had an off day. 
/Peter |
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