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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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