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Rigol DHO800 memory depth / bandwidth upgrades and noise level!

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rf-loop:

--- Quote from: Fungus on November 06, 2023, 10:16:33 pm ---One more before bed time...

I did a self-cal and measured Vavg as well as AC-RMS. There's only 3 channels because that's all that fits in the visible area (you guys can't scroll tables up/down like I can):



--- End quote ---

Not bad at all.

For compare.
Here Siglent low end model.  (1204XHD China only model).



Same 1ms/div and 10k Mem but in Siglent it have 1MSa/s instead of 500kSa/s as in Rigol in your image (because Rigol want display here only half length of acquisition and hide other half. Then other half is possible to look only after stop acquisition. Maybe it's exciting when everything isn't shown and revealed right away. I think that kind of thing would be better suited for a bedroom than to a measuring device. But let everyone do it in their own way.)


Note here is used 4 channels what all have different setup. 20MHz limit/100MHz limit, 1Mohm input and 50ohm input.
(100MHz limit is forced by system when more than 2 channels simultaneously in use - because real ADC samplerate!)


ifonlyeverything:
Is a hacked DHO800 an upgrade from a Siglent SDS1104X-E? I'm interested in the HDMI output + smaller form factor (small workspace) unless it's a bad trade-off in some way or another.

ebastler:

--- Quote from: ifonlyeverything on November 07, 2023, 01:16:48 pm ---Is a hacked DHO800 an upgrade from a Siglent SDS1104X-E? I'm interested in the HDMI output + smaller form factor (small workspace) unless it's a bad trade-off in some way or another.

--- End quote ---

That depends a lot on which functionality is important to you. Here's my take:

Clear advantages of the DHO800:
- Smaller form factor, USB-C supply (if powerbank operation is of interest).
- Nicely implemented touch interface (plus classical controls and the dual multi-function knobs).
- 12 bit resolution -- not so much for lowest-level noise, but dynamic range, e.g. in FFT.

Clear advantages of the Siglent (if relevant to you):
- Logic analyzer upgrade possible -- although via somewhat expensive external unit with some limitations.
- Bode plots, if you have an external Siglent function generator.
Both functions would require you to get a DHO9xx or DHO9xxS if you want them in the Rigol series.

Philosophical/debatable differences:
- The scopes differ in various details, regarding their trigger, protocol decoding and measurement options. No clear winner here in my opinion, but it's worth checking the datasheets if some particular functionality is important to you.
- UI design is a matter of taste, I'd say. Siglent fans will argue that the restrained and space-saving design of the Siglent UI is more functional and professional; Rigol fans will argue that the Siglent layout and fonts look a bit old-fashioned and that they find it easier to get their bearings with Rigol's visual cues. Look at a few still pictures and/or Youtube videos to see whether you have a strong personal preference there.

bdunham7:

--- Quote from: Fungus on November 07, 2023, 06:16:37 am ---Is that a 1104X-E?

Why is it worse with the bandwidth limit on?

--- End quote ---

It says "1104X-E" on the front but it thinks it is a 1204X-E, 200MHz BW.

The noise is lower at 20MHz BW, as I think has been explained. 

tautech:

--- Quote from: ifonlyeverything on November 07, 2023, 01:16:48 pm ---Is a hacked DHO800 an upgrade from a Siglent SDS1104X-E? I'm interested in the HDMI output + smaller form factor (small workspace) unless it's a bad trade-off in some way or another.

--- End quote ---
You may need to consider a bigger picture.
Do you have a PC on/near the bench as the webserver provides for porting to a large display.
X-E sampling rates and mem depth are superior with all channels active unless the 800 is hacked which only provides greater mem depth.
BTW, did you know all X-E models have been reduced in price.

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