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Siglent SDS800X HD Review & Demonstration Thread

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ebastler:

--- Quote from: markone on May 11, 2024, 01:27:34 pm ---Let's put it simple : the selected RBW values are not working correctly, it's useless to make comparison between utterly wrong spectrum images, if you want to get something similar to reality @ 50MHz CF / 1MHz SPAN, set RBW minimum at 3.36KHz (as I did in the "clean" spectrum that I posted).

--- End quote ---

I think the discussion has already moved beyond your "selected RBW values not working" and "utterly wrong" statements. gf's observation that the lowered sampling rates which are associated with your long captures (125 MSa/s only in your most recent screenshot!) will result in folded-back harmonics makes good sense to me.

The presence of harmonics can be confirmed with a high-bandwidth FFT, and the foldback effect can be confirmed by carefully tuning the input signal to an exact 50 MHz (as perceived by the scope). Please take a step back and re-read the recent posts.

2N3055:
Here is my scope.
same settings, I even tuned the AWG for scope to show 50.00067 MHz so we can see if there are some specific beat frequencies..

markone:

--- Quote from: ebastler on May 11, 2024, 01:51:27 pm ---
--- Quote from: markone on May 11, 2024, 01:27:34 pm ---Let's put it simple : the selected RBW values are not working correctly, it's useless to make comparison between utterly wrong spectrum images, if you want to get something similar to reality @ 50MHz CF / 1MHz SPAN, set RBW minimum at 3.36KHz (as I did in the "clean" spectrum that I posted).

--- End quote ---

I think the discussion has already moved beyond your "selected RBW values not working" and "utterly wrong" statements. gf's observation that the lowered sampling rates which are associated with your long captures (125 MSa/s only in your most recent screenshot!) will result in folded-back harmonics makes good sense to me.


--- End quote ---

You can move beyond what you want, but the sad truth is still "selected RBW values not working" and "utterly wrong"


--- Quote from: ebastler on May 11, 2024, 01:51:27 pm ---
The presence of harmonics can be confirmed with a high-bandwidth FFT, and the foldback effect can be confirmed by carefully tuning the input signal to an exact 50 MHz (as perceived by the scope). Please take a step back and re-read the recent posts.

--- End quote ---

No need to re-read considerations based on false spectrum readings, because also your "high-bandwidth FFT" is fullfilled with non-existent spurious, if you want to look at the "truth" please make use of a real SSA as I'm doing.

markone:

--- Quote from: 2N3055 on May 11, 2024, 02:13:36 pm ---Here is my scope.
same settings, I even tuned the AWG for scope to show 50.00067 MHz so we can see if there are some specific beat frequencies..

--- End quote ---

Model of your scope ?

EDIT : please try to set the SPAM to 1MHz just to align settings.

2N3055:

--- Quote from: markone on May 11, 2024, 02:14:53 pm ---
--- Quote from: 2N3055 on May 11, 2024, 02:13:36 pm ---Here is my scope.
same settings, I even tuned the AWG for scope to show 50.00067 MHz so we can see if there are some specific beat frequencies..

--- End quote ---

Model of your scope ?

--- End quote ---
What do you mean? SDS824xHD of course. That is one we are discussing here...

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