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Measuring Distortions with the Scope:What you see is not what you really have..
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mawyatt:

--- Quote from: Performa01 on January 08, 2023, 06:20:23 am ---No doubt that the real deal – a true higher resolution ADC – is the superior solution. Yet there is nothing wrong with a proper ERES/HiRes implementation as long as the user thinks a little. And that should not be too much asked, since there are so many situations in T&M where we cannot trust blindingly and just copy some values from an instrument to the lab protocol without a second thought.


--- End quote ---

This is the basic issue with folks utilizing an instrument beyond their understanding, as many knowledgable individuals have said before, "Know Thy Instrument", or KTI!!

We've all been there, done that, at least us older folks!! Where we grab a little utilized instrument from storage to make a measurement or troubleshoot without taking the time to revisit what/how the instrument works/behaves, only to make a useless measurement that confounds the problem at hand!!

Today many of these little utilized instruments/functions are now contained within the modern DSO, especially true with the ERES/HiRes, FRA/Bode, and SA(FFT) Function/Mode/Instruments, and there seems to be little understanding of how the Signal Processing, Input Amps/Attenuators and core ADCs behave (especially WRT each other) when utilized outside the usual Time Domain Scope operation, as with these mentioned functions.

Anyway, thanks to the demonstrated truly knowledgable individuals like yourself and very few others, some of the less seasoned folks can sift thru all the rubbish and glean a sparkle of understanding regarding these increasingly complex data acquisition systems we now call DSO/MSOs :-+

Best,
Martin72:
Now I only have the SDG2122X, the SDG1062X is gone.... :(
But not far away, it landed on my work(sold to it)..... ;)
This has the nice effect that I can continue to make measurements with it, but then with the HDO6034A...Not the worst option. 8)
Martin72:
Today just before closing time quickly measured what, must still adjust the scaling, for better reading.
But nothing new, the second harmonic dominates the spectrum, even with the HDO.
Then again quickly our last analog generator, a Wavetek, connected.
Then I experimented with and without ground, but these were only marginal changes.
2N3055:

--- Quote from: Martin72 on January 10, 2023, 09:49:19 pm ---Short measure today, must set the axis scaling more proper..
But nothing new, the 2nd harmonic is domenating on the HDO too.
Today just before closing time quickly measured what, must still adjust the scaling, for better reading.
But nothing new, the second harmonic dominates the spectrum, even with the HDO.
Then again quickly our last analog generator, a Wavetek, connected.
Then I experimented with and without ground, but these were only marginal changes.

--- End quote ---

Wise choice of level and V/div. Try similar with SDS2000X HD. Also try using fine vertical and watch for the sweet spot...
Martin72:

--- Quote ---Try similar with SDS2000X HD
--- End quote ---

Can do but now with the SDG2122X only(or I take the HD to work...Hmmm..)
Meanwhile I got an idea, we have several high precision power analyzers from ZES here.
They can show THD and SHD, when their input sensivity is low enough, I would connect the SDG1032X to one of them, could be interesting.
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