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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
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thm_w:
I have Hardware: 3. DHO1074. Date of calibration was 2022/10/15.
Veteran68:

--- Quote from: thm_w on December 22, 2023, 12:04:00 am ---I have Hardware: 3. DHO1074. Date of calibration was 2022/10/15.

--- End quote ---

Interesting. My DHO1074 has Hardware: 2 with a calibration date of 2022/10/19. So 4 days after yours, but prior HW version. I wonder if calibration happens at the end of the assembly line, or if completed units are stocked away and calibrated later.

I suspect they have multiple HW revisions with slight variations based on the components they can source at a given time, so probably have multiple revisions coming through their factory/warehouses. Yours is the first I've seen/heard of as revision 3.
core:
I accidentally compared some screenshots and noticed that the latest firmware version has significantly more noise.
I have attached the comparison between 02.04 and 02.12.

Inputs have 50 Ohm terminators.

Can anyone check if they got the same result?
gf:

--- Quote from: core on December 22, 2023, 06:28:49 am ---I accidentally compared some screenshots and noticed that the latest firmware version has significantly more noise.
I have attached the comparison between 02.04 and 02.12.

--- End quote ---

Presuming that the settings (and especially Averaging, HiRes) are the same, my first thought would be that the noise bandwidth could have changed (different digital? filtering, maybe implied hidden HiRes in the old version?). So I would look at the FFT and compare the noise power spectral distribution between the two versions.
ebastler:

--- Quote from: core on December 22, 2023, 06:28:49 am ---Can anyone check if they got the same result?

--- End quote ---

Is it possible to go back to older firmware versions, or did you just happen to have a saved screenshot which showed the old version info and its noise?
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