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Zero span spectrum analyzer .FFT, sweep, filters and RBW.

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G0HZU:
I'm a bit confused by some of the things you are saying about zero span mode. It might be worth it for you to read Keysight's classic AN-150 application note as this will explain the pros and cons of FFT vs swept modes.

I've never used the Siglent analysers, but I would be surprised if they offer a 1Hz digital RBW. This requires a very stable frequency reference and a very good LO synthesiser to make it worthwhile when in zero span mode. Lower cost analysers are going to be limited to maybe a 10Hz digital RBW when the analyser is used in swept or zero span mode.

However, I'm not convinced you actually need a 1Hz digital RBW for zero span mode unless you are doing some fairly critical analysis of a slowly changing  signal. Usually, 10Hz is adequate.

 

tautech:

--- Quote from: G0HZU on August 06, 2024, 10:19:10 pm ---I'm a bit confused by some of the things you are saying about zero span mode. It might be worth it for you to read Keysight's classic AN-150 application note as this will explain the pros and cons of FFT vs swept modes.

I've never used the Siglent analysers, but I would be surprised if they offer a 1Hz digital RBW. This requires a very stable frequency reference and a very good LO synthesiser to make it worthwhile when in zero span mode. Lower cost analysers are going to be limited to maybe a 10Hz digital RBW when the analyser is used in swept or zero span mode.

However, I'm not convinced you actually need a 1Hz digital RBW for zero span mode unless you are doing some fairly critical analysis of a slowly changing  signal. Usually, 10Hz is adequate.

--- End quote ---
::)
https://int.siglent.com/u_file/download/24_07_10/SSA3000X%20Plus_DataSheet_E04G.pdf

G0HZU:

--- Quote from: tautech on August 06, 2024, 10:23:30 pm ---
--- Quote from: G0HZU on August 06, 2024, 10:19:10 pm ---I'm a bit confused by some of the things you are saying about zero span mode. It might be worth it for you to read Keysight's classic AN-150 application note as this will explain the pros and cons of FFT vs swept modes.

I've never used the Siglent analysers, but I would be surprised if they offer a 1Hz digital RBW. This requires a very stable frequency reference and a very good LO synthesiser to make it worthwhile when in zero span mode. Lower cost analysers are going to be limited to maybe a 10Hz digital RBW when the analyser is used in swept or zero span mode.

However, I'm not convinced you actually need a 1Hz digital RBW for zero span mode unless you are doing some fairly critical analysis of a slowly changing  signal. Usually, 10Hz is adequate.

--- End quote ---
::)
https://int.siglent.com/u_file/download/24_07_10/SSA3000X%20Plus_DataSheet_E04G.pdf

--- End quote ---

I know that the Siglent can offer 1Hz RBW in FFT mode, but can it also offer it as a digital RBW in zero span?



tautech:

--- Quote from: G0HZU on August 06, 2024, 10:35:14 pm ---
--- Quote from: tautech on August 06, 2024, 10:23:30 pm ---
--- Quote from: G0HZU on August 06, 2024, 10:19:10 pm ---I'm a bit confused by some of the things you are saying about zero span mode. It might be worth it for you to read Keysight's classic AN-150 application note as this will explain the pros and cons of FFT vs swept modes.

I've never used the Siglent analysers, but I would be surprised if they offer a 1Hz digital RBW. This requires a very stable frequency reference and a very good LO synthesiser to make it worthwhile when in zero span mode. Lower cost analysers are going to be limited to maybe a 10Hz digital RBW when the analyser is used in swept or zero span mode.

However, I'm not convinced you actually need a 1Hz digital RBW for zero span mode unless you are doing some fairly critical analysis of a slowly changing  signal. Usually, 10Hz is adequate.

--- End quote ---
::)
https://int.siglent.com/u_file/download/24_07_10/SSA3000X%20Plus_DataSheet_E04G.pdf

--- End quote ---

I know that the Siglent can offer 1Hz RBW in FFT mode, but can it also offer it as a digital RBW in zero span?

--- End quote ---
No just checked, 1 Hz RBW is only available down to a 100 Hz Span.
Zero Span provides 30 Hz RBW.
See screenshots.

coppercone2:
get a older unit if you don't want spam, the new oscilloscopes and whatnot will always be bringing up some pop up advertisement about features, complaining about the RTC, etc

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