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Siglent SDS1000X-HD - Bugs and "features" thread.

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uliano:
Ok so I defaulted and  self-calibrated it.

Some new "features":

- only when C2 is off then spikes appearing also on C1, when C2 is on then it "takes it over" all the spikes.
- more notably now I'm on 10 mV/div scales and trigger i set to 6 mV
- as usual spikes only when channel postion is close to 0
https://youtu.be/QOvJI54BD0s
https://youtu.be/Hm2VK7kibIE

(contacted assistance... )

uliano:
Bandwith also doesn't seem to be the answer

tautech:

--- Quote from: uliano on November 12, 2024, 04:58:28 pm ---Bandwith also doesn't seem to be the answer

--- End quote ---
Can I ask if this is observed with open inputs or with probes connected ?

About to do some checks with a unit I have here in case what you see is some local RFI/EMI at your bench.  :-//

tautech:

--- Quote from: uliano on November 12, 2024, 04:58:28 pm ---Bandwith also doesn't seem to be the answer

--- End quote ---
Can't replicate your results.

Open inputs tests
With a Single trigger I can trigger on noise at low level trigger settings, under ~250uV.

Some screenshots attached.
#5png is a Single trigger setup waiting for a peak that never arrives at those trigger levels.

All I can suggest is to investigate local RFI noise.....these can even be from some device in an adjacent room.

uliano:
If they were interferences:

- they would show up at any vertical offset of the channel an not only close to zero
- they would show up not only on ch2 an to a lesser extent on ch1 (that if I’m not wrong share the same ADC and therefore some input circuitry) but also on ch3 and ch4.
- their amplitude would be independent from the vertical scale (of that i’m not so sure if the enter after gain stage, but it is a strange point of attack for RFI, much less likely the front end in my opinion). I observe the same amplitude on screen on both 0.5 and 10 mV/div.
- they would be detected by old trusty 1104X-E

I also moved to the opposite side of the flat to no avail, so it would have been a very pervasive  RFI but yes this one is not conclusive.

All of that points to a defect in the input pipeline of only 2 channels ,after front end just before ADC. As it is a subtle effect it may have escaped quality control.


Let’s see when assistance reaches back to me what they’re gonna say.

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