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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
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gf:

--- Quote from: core on December 14, 2023, 08:14:47 am ---FFTs for the same signal, normal mode and HiRes16.
No difference.

--- End quote ---

Why would you expect a difference?
HiRes is a lowpass filter. At 2GSa/s, HiRes16 is supposed to reduce the noise bandwidth from 1GHz to 62.5 MHz.
So you will certainly not see any effect for signal or noise components in the 0...10kHz range.
core:

--- Quote from: gf on December 14, 2023, 09:42:04 am ---
--- Quote from: core on December 14, 2023, 08:14:47 am ---FFTs for the same signal, normal mode and HiRes16.
No difference.

--- End quote ---

Why would you expect a difference?
HiRes is a lowpass filter. At 2GSa/s, HiRes16 is supposed to reduce the noise bandwidth from 1GHz to 62.5 MHz.
So you will certainly not see any effect for signal or noise components in the 0...10kHz range.

--- End quote ---


You are right. I was thinking that there is about the same relative low noise, under 120dB.
I have attached the FFT up to 1MHz, for the same signal. Normal and HiRes16.
There is an improvement, about 4-5dB at higher frequencies.

Anyway, the FFT on this scope it's not very versatile.
gf:

--- Quote from: core on December 14, 2023, 11:01:26 am ---I have attached the FFT up to 1MHz, for the same signal. Normal and HiRes16.

--- End quote ---

If you really want to see the full difference in the frequency domain, then rather use a 0...1GHz span.
And better do it even without any signal, so that you only see the noise floor.

EDIT: Sorry, I noticed too late that the FFT sample rate was only 20 MSa/s, so a 0...10 MHz span would be approriate.

[ A nast side effect of the lower FFT sample rate is of course that that folded aliases may garble the FFT display, although the time domain display (at full sample rate) does not show signs of aliasing. ]
ebastler:

--- Quote from: idolclub on November 17, 2023, 09:45:17 am ---Rigol releases new DHO1000U series:

DHO1202U, 2 channel, 200MHz, 2GSa/s, 50Mpts(opt.), 500,000wfms/s
DHO1204U, 4 channel, 200MHz, 2GSa/s, 50Mpts(opt.), 500,000wfms/s

Chinese Datasheet:
https://www.rigol.com/file/DHO1000U%E6%95%B0%E6%8D%AE%E6%89%8B%E5%86%8C.pdf

--- End quote ---

Not quite sure when that happened, but the 'U' models have appeared on Rigol's international site with USD pricing now, https://int.rigol.com/products/detail/DHO1000. $999 for the 2-channel model, $1199 for 4 channels. (Compared to $1399 and $1699 for the original DHO120x, which are also still listed.) The datasheet for the DHO1000 series has not been updated yet, but the basic (reduced) specs of the U version are mentioned. I don't know whether they are actually available for sale in the US yet?

On the European rigol.eu site the 'U' models are not yet mentioned. But the news there is that the DHO1072 is now listed as "sold out". So maybe the non-U models will indeed be sold off, and the future entry-level 12 bit product landscape will only have the DHO800, 900 and 120xU?
core:
Thanks to Performa01's ideea regarding the alternative zoom from another thread:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-hd-12bit-(published-for-chinese-domestic-market-only)/msg5202036/#msg5202036

I've tried to apply the same for DHO1074, because we know that Rigol don't have vertical zoom, or "zone zoom".
In order to stabilize the waveform I've used the acquisition mode on average (256).
Acq. mem. auto, waveform signal StairUD 1MHz, 1.2Vpp from an Uni-T UTG962E (a very cute sig. generator).

See attached the original waveform and vertical zoom using the math function AX+B, where B=0.
- for the first pictures I've used the same vertical scale (100mV/div), with A=20
- for the second pictures I've used 5mV/div for math function, and A=1
Same result, of course.
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