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| Siglent SDG1032X sine distortion at 1 kHz ? |
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| rf-loop:
My previous image. :bullshit: :bullshit: :-// Bullshit warning aka fakenews warning! I do not believe these all harmonics and/or these harmonics levels are true out from SDG1032X/62X output! Real spectrum analyzer image is very different! Later about this. Now other things keep busy. |
| Martin72:
Interesting that it could be "fake". If you were to add up the thd from your picture, they would probably be in the specification. In an ideal world, the harmonics would fall continuously after the fundamental wave. That they do not do so here has several reasons - but that everything you see could then be "fake"... I'm looking forward to seeing what you pull out of your hat later. |
| 2N3055:
I don't have SDG1000X/2000X... This is for SDG6000X |
| rf-loop:
--- Quote from: Martin72 on December 27, 2022, 12:33:05 pm ---Interesting that it could be "fake". If you were to add up the thd from your picture, they would probably be in the specification. In an ideal world, the harmonics would fall continuously after the fundamental wave. That they do not do so here has several reasons - but that everything you see could then be "fake"... I'm looking forward to seeing what you pull out of your hat later. --- End quote --- Naturally "all" is not fake but... I do not like oscilloscope generate so much these "fake" harmonics. So if someone ask/hope that Siglent implement automatic THD measurement.... please do not. Garbage in leads always to garbage out and this garbage we do not need, even if salesmen can add one row to features list.. Due to some reasons I use here more low signal level. Signal level is -20dBm. (it is also attenuated because it is not designed for under 9kHz so I believe mixer level is not problem) Then other thing. SSA specs start 9Khz. Using SSA trace B, I have done some kind of "level correction" curve. Yes this is not now rocket science... only just for fun and make SDS FFT bit questionable for this purpose. Look these "harmonics" in SDS image specially after 7th . What generate these all peaks. It is sure they do not come from generator - least not even close this level. This requires further research. It also requires different methods and tools. Note: there need correct levels specially under 3kHz. B trace input level was -21dBm (swept with MaxHold). A trace input level -20dBm. Fixed 1kHz -20dBm CH1 input level -20dBm. Fixed 1kHz Sine -20dBm fom SDG1032/62X (-20dBm is 63.3mVpp) |
| Calvin:
Hi, just a number of quickn´dirty measurements of my SDG2042X with my QuantAsylum QA401 24Bit audio analyzer. Yellow traces are from the analyzer, red traces from the SDG2042X. Frequencies: 1kHz and 100Hz, Amplitude: 0dBV (note the analyzer´s ADC has its THD-minimum at -16dBV input level) It shows that the analyzer´s own generator creates a cleaner Signal and at lower noise due to much lower bandwidth. regards Calvin |
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