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| Measuring Distortions with the Scope:What you see is not what you really have.. |
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| Martin72:
Hi, --- Quote ---What do you get if you measure a short? Does it show precisely 0 µV then? --- End quote --- It shows 000.00mV when shorted or the 50 Ohm termination is connected - Open the last digit change between -/+ 5. I agree that could be only streetnumber. If you set a dedicated offset voltage on the generator, it will also be measured accurately by the meter. I could test how "low" I can get with this... With the next test I´ll sort the table. |
| mawyatt:
All this and the other somewhat related thread got me thinking about what's going on, so just a quick setup to check things out. Here's the related thread. https://www.eevblog.com/forum/testgear/siglent-sdg1032x-sine-distortion-at-1-khz/25/ So, we got our Pico Scope 4262 (16 bit ADC) out and hooked up to a laptop. Then used the builtin AWG (only goes to 20KHz tho) and setup a 10KHz sine wave signal. We setup the scope for a 0-100KHz span and captured the spectrum shown below as Pico_AWG. Then connected the Pico AWG output to a SA as shown in PNG7. Then connected to our SDS2000X+ as shown in PNG_147. No attempt was made to "normalize" things and get all the displays setup up for a detailed comparison, just a quick look and see. It appears that the SDS2000X+ is introducing the harmonic distortion from within, as the dramatic difference in the spectrums show. Later we'll try and look at the SDG2000 & 6000 AWGs we have. Best, |
| mawyatt:
See above, here's the added files for the SDG2000X and the SDG6000X set at 10KHz. Pico_AWG 2 is SDG2000X Pico_AWG 3 is SDG6000X PNG 8 is SA SDG2000X PNG9 is SA SDG6000X PNG 148 is DSO SDS2000X+ for SDG2000X PNG 149 is DSO SDS2000X+ for SDG6000X The AWGs seem much better than the SDS2000X+ can display regarding harmonic content. Best, |
| Martin72:
Hi.... Following one of Sinisas hints I´ve played with the vertical resolution between 100mV and 200mV/Div., same FFT settings as before. Two pics, one with 100mV/div. (as the measure before) and one with 130mV/div. Judge by yourself.. |
| electr_peter:
Likely explanation of SDS FFT issue described in other topic. |
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