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Siglent SDS1104X-E In-Depth Review
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core:
I've tried too. So, another SDS1104X-E in test  ;D

Signal generator is Siglent SDG2000X

HiZ, no 50 Ohm terminator on scope.

For AM : 1 ch 10MHz, 10Vpp; 2 ch 10.05MHz, 2mVpp. Mixed with wave combine.
For FM : 1Vpp, 10MHz, FM dev 50kHz, FM freq 1kHz.

FFT settings:
1M, Hanning, Center freq 10MHz, 100kHz/div for AM and 50kHz/div for FM

Same results.
tautech:


The blue Print (to USB) button is more useful to keep menus displayed.  ;)
core:

--- Quote from: tautech on November 30, 2023, 08:05:45 pm ---

The blue Print (to USB) button is more useful to keep menus displayed.  ;)

--- End quote ---

Of course, yeah. I was in a hurry ... forgot about the blue button ...
Martin72:
So, here again in a little more detail...
Performa01:
There has already been a two tone test for exploring the 1st order dynamic range of the SDS1104X-E in mid 2019, where an 80 dB dynamic range could be demonstrated (reply #1386):

https://www.eevblog.com/forum/testgear/siglent-sds1204x-e-released-for-domestic-markets-in-china/msg2454291/#msg2454291



--- Quote from: Performa01 on November 29, 2023, 01:26:46 pm ---Now for the “30 mVpp signal at 10 V/div” test. Yes, this is a clear case where a low-noise 8-bit scope has to give up. In the AM test, the carrier acted as (almost full scale) dither, hence the accuracy of level measurements far below the 8-bit dynamic range was still pretty good. But now we have to rely on the input noise as dither, which will barely exceed 1 LSB at 200 mV/div. Consequently, the accuracy is completely gone, but the signal itself is still clearly visible:


SDS1104X-E_FFT_10MHz_-40dBV_Avg10

Yes, this appears to be the advantage of a 12-bit DSO, but it is nevertheless pretty much meaningless in practice: whenever we have to measure an isolated (single) signal that low, then we just select an appropriate vertical gain. If, on the other hand, this is not possible because there are other stronger signals present at the same time, then we can happily use a less sensitive input range and let those stronger signals act as dither. All in all, the rather high 1 LSB threshold of an 8-bit ADC isn’t really a concern particularly for FFT.

--- End quote ---
Now let’s prove that assertion as well.

When using the low vertical ranges, like 1 mV/div or even 500 µV/div, the input noise acts as a dither just nicely. This enables us to make accurate measurements down to -110 dBm (2 µVpp = 707 nVrms)!


SDS1104X-E_FFT_10MHz_-110dBm_500uV

The measurement results from -40 dBm down to -110 dBm can be found in the following table:


SDS1104X-E_FFT_10MHz_LL

The maximum error was 0.2 dB or 2.33% respectively for -100 dBm @ 10 MHz.
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