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Testing the NEW SIGLENT SDG1022X-PLUS, output 100Mhz!!
Tankj:
After a bad experience on buying the SIGLENT SDS2204X-HD, I finally switched to SDS1204X-HD and SDG1022X-PLUS instead.
EDIT: due to the improper vertical scale setting, all tests blew with green FFT trace has introduced the scope's frontend nonlinear distortion.
I redid these tests in subsequent replys, changing to brown FFT trace To distinguish.
Did a quick signal test on the new SDG1022X-PLUS in to SDS1204X-HD,
SDG outputs 0dBm sin wave into scope 50Ω terminal with RF cable (BNC to SMA on SDG side).
FFT are fixed 256kpts, Varying time bases for different frequency resolution. Flat top on most time for best amplitude accuracy.
Testing desk:
1,Signal Quality Test
1kHz with 50k span
1kHz with 2k span
10kHz with 100k span
10kHz with 5k span
100kHz with 1M span
100kHz with 190k span
100kHz with 10k span
1MHz with 10M span
1MHz with 1M span
Tankj:
10MHz with 100M span
10MHz with 1M span
25MHz with 100M span
25MHz with 1M span
Tankj:
2,Square Wave and Rise Time
In the SDG1000X PLUS datasheet, the rise time is 10-11nS.
1Mhz and 20Mhz Square Wave, 10.3nS rise time
When I set a fast rising edge triangle wave, see what happens
Rise time is 5.38nS!
3, Higher frequency output
As the top model is 60Mhz, I want try some tricks on my 25Mz model see if it can do higher waves, it actually puts 5.38nS rising time right?
I've tried to create a file containing multiple repeated waveforms and output it in True Arb mode. As the True Arb mode is point-to-point output and the maximum sample rate is 250M, there will only have 4.16 points at each wave if I need to output 60Mhz.
It works. But the wave frequency is coupled with sampling rate, NO stable output at most time. It dose stable just on certain specific frequencies.
Next I tried to use DDS mode, the output was still unstable. Given the way DDS works, the waveforms I created before may have too few points. So I created a 256k waveform consisting of 5 repeated sine waves, and then, the magic happened ::)
20Mhz Arb in DDS mode, outputs 100Mhz sine wave! the rise time is just under 3nS!!
You can see that the 100Mhz sine wave is very clean, even cleaner than the old Rigol DG1022U at 20Mhz I used before.
I also created a 10 repeated sine waves Arb to test higher frequencies, the output rapidly decays right after 105Mhz, which shows the limit of the output stage bandwidth also the 250M DDS generator.
KungFuJosh:
--- Quote from: Tankj on December 12, 2024, 01:48:02 pm ---After a bad experience on buying the SIGLENT SDS2204X-HD
--- End quote ---
What happened with your SDS2204X HD? Or are you referring to the issue with the firmware update on the Plus model?
Also, is that TH2830 running as a 2832? 😉
Tankj:
By setting the output frequency in proportion (here is 5X), we can get any output up to 100Mhz through DDS Arb mode.
Here is a 50Mhz sine wave
4, FFT test above 25Mhz
50Mhz with 100M span
100Mhz with 500M span
100Mhz with 1M span
at 50Mhz, the signal drops to -0.14dBm
at 100Mhz, it drops to about -1.1dBm
This seems perfectly acceptable to me.
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