Products > Test Equipment
Two Tone Test with Scope and SA
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mawyatt:

--- Quote from: jjoonathan on August 04, 2020, 07:09:40 pm ---Is SDG6000X WaveCombine digital? Mine clicks a relay when I engage it. I suppose it's probably range related. In any case, the resulting signals are quite nice!

--- End quote ---

Don't have one so just speculating and why I said "think" it might be. Analog combing would have the advantage of better resolution. The results certainly look good, so either way it's a nice performing AWG.

Best,
tautech:

--- Quote from: mawyatt on August 04, 2020, 11:37:21 pm ---
--- Quote from: jjoonathan on August 04, 2020, 07:09:40 pm ---Is SDG6000X WaveCombine digital? Mine clicks a relay when I engage it. I suppose it's probably range related. In any case, the resulting signals are quite nice!

--- End quote ---

Don't have one so just speculating and why I said "think" it might be. Analog combing would have the advantage of better resolution. The results certainly look good, so either way it's a nice performing AWG.

--- End quote ---
All the SDG X models offer the Wave Combine feature including the 14 bit SDG1000X models.

I checked the SDG2042X I've been using and indeed if channels are ON and Wave Combine is selected a relay click is heard however until someone RE's these we don't yet know where in the signal path this occurs.

Still don't have my SDG6022X back from a mate but will have over the weekend so to push 2 tone tests to much higher frequencies than thus far...... but it might need improving a bit first.  >:D
Will also do 2 tones at different amplitudes like rf-loop suggested and all for shits and giggles although we might just learn a bit more.  :)
mawyatt:

--- Quote from: tautech on August 04, 2020, 11:49:15 pm ---
--- Quote from: mawyatt on August 04, 2020, 11:37:21 pm ---
--- Quote from: jjoonathan on August 04, 2020, 07:09:40 pm ---Is SDG6000X WaveCombine digital? Mine clicks a relay when I engage it. I suppose it's probably range related. In any case, the resulting signals are quite nice!

--- End quote ---

Don't have one so just speculating and why I said "think" it might be. Analog combing would have the advantage of better resolution. The results certainly look good, so either way it's a nice performing AWG.

--- End quote ---
All the SDG X models offer the Wave Combine feature including the 14 bit SDG1000X models.

I checked the SDG2042X I've been using and indeed if channels are ON and Wave Combine is selected a relay click is heard however until someone RE's these we don't yet know where in the signal path this occurs.

Still don't have my SDG6022X back from a mate but will have over the weekend so to push 2 tone tests to much higher frequencies than thus far...... but it might need improving a bit first.  >:D
Will also do 2 tones at different amplitudes like rf-loop suggested and all for shits and giggles although we might just learn a bit more.  :)

--- End quote ---

Well if you and JJ are hearing a relay click that's gotta hint at the combining is taking place in the analog section, not digital. Since a relay is used this also hints that this is at a higher analog level where a relay is preferred for linearity over a SS switch, maybe even at the outputs which are resistive summed??

I'll be happy to RE if someone will lend me one :)

Best,
mawyatt:
Hey, this is old but think it's the best place to start with a continuation with the new Siglent SDS2000X HD which has true 12 bit ADCs. Nice to compare how well the 12 bit core ADC improves the 2 Tone IMD tests.

Know a couple of you folks out there have these new MSOs and hoping you'll be kind enough to do some additional 2 Tone IMD testing with the basic 12 bit and any additional resolution enhancements available.

Best,
rf-loop:
Generator SDG1032X. It need need tightly understand that this with splitter is not enough for serious dual tone test. Who knows what it itself generate...
Separate channels externally resistive combined (resistive 50Ω Δ type splitter)
So, SDG outputs are 6dB higher. To SDS2504X HD input ~0dBm signals.



9.9kHz and 10.1kHz  (distance 200Hz)
f1 = 9.9kHz  f2 = 10.1kHz

2*f2 - f1 = 10.3 Peak Marker 4 (-85dBc)
2*f1 - f2 =   9.7 Peak Marker 1 (-83dBc)




99.9 and 100.1kHz  (distance 200Hz)


0.9999MHz and 1.0001MHz  (distance 200Hz)
(note FFT samplerate change)


10.999MHz and 11.001MHz (distance 2kHz diff)
(note FFT samplerate change)
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