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Two Tone Test with Scope and SA
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mawyatt:
Think the issue boils down to whether the various contributors of Two Tone IMD in an DSO & signal sources can be determined by the RSS method which assumes incoherent signals, or not, which assumes coherent signals. This is where the 3dB difference arrises I believe.

Anyway, as long as the methods for DSO Two Tone IMD evaluations are the same, then the results can at least be compared wrt each other, and in either case the actual 2 Tone IMD of the new SDS2000X HD is impressive as has been shown.

Best,
mawyatt:

--- Quote from: tautech on June 15, 2022, 01:21:40 am ---Mostly the 2 tone sources in this thread have been created in SDG models with their 2ch wave combine feature although I don't remember now if the very early one in this thread I did for Mike had locked phasing however I don't think that was needed or even a requirement from Mike.

Anyways, riveting discussion that we can all learn something from.  :)

--- End quote ---

Don't recall details either, was this plot from the SDG2042X AWG? Recall something about hearing AWG relays click when the wave combine function is active and brings up the question as to how and where this waveform combining takes place?

Anyway, speaks highly of the SDS2000X HD. Do you know if the front end section of the SDS2000X HD & ADC are the same as the SDS6000 series 12bit ADC version sold only in China, or the one for LeCroy?

Agree, very interesting discussions!!

Best,
mawyatt:

--- Quote from: 2N3055 on June 14, 2022, 10:30:29 pm ---.....
He is not trying to measure any external DUT. He is simply trying to characterize the scope internal IM distortion.

What am I missing here?

--- End quote ---

Don't think you are missing anything, spot on to what reviving this thread is about!!

Best,
tautech:

--- Quote from: mawyatt on June 15, 2022, 01:53:33 am ---
--- Quote from: tautech on June 15, 2022, 01:21:40 am ---Mostly the 2 tone sources in this thread have been created in SDG models with their 2ch wave combine feature although I don't remember now if the very early one in this thread I did for Mike had locked phasing however I don't think that was needed or even a requirement from Mike.

Anyways, riveting discussion that we can all learn something from.  :)

--- End quote ---

Don't recall details either, was this plot from the SDG2042X AWG? Recall something about hearing AWG relays click when the wave combine function is active and brings up the question as to how and where this waveform combining takes place?


--- End quote ---
Yes, SDG2042X it was and don't you too have one now ?

--- Quote ---Anyway, speaks highly of the SDS2000X HD. Do you know if the front end section of the SDS2000X HD & ADC are the same as the SDS6000 series 12bit ADC version sold only in China, or the one for LeCroy?
--- End quote ---
Have no idea Mike, maybe 2N3055 or Performa01 can help you with this one....that's if their NDA lets them.  :-X

I suppose I should do a 2 tone with my SDS6204A however with what I have here 200 MHz is the current limit of toys available.
mawyatt:

--- Quote from: tautech on June 15, 2022, 02:12:58 am ---
Yes, SDG2042X it was and don't you too have one now ?

--- End quote ---
Yes, have a SDG6022X also (needed the higher frequency waveforms).


--- Quote ---I suppose I should do a 2 tone with my SDS6204A however with what I have here 200 MHz is the current limit of toys available.

--- End quote ---

Would be interesting to see how good this SDS6204A is, I'm sure others are interested as well.

Best,
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