Products > Test Equipment
HDO4204 vs. SDS2104X HD
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Martin72:

--- Quote from: dpenev on December 15, 2022, 10:15:54 am ---Hello,

Tring to compare Rigol HDO4204 and Siglent SDS2104X HD

Both 4 channels, 12 bits Oscilloscopes.

Rigol HDO4204 pros:
1. More powerful platform RK3399 (dual-core Cortex-A72 and quad-core Cortex-A53) compared to Zynq(Armv7)
2. 4Gs/s - twice as big sampling rate
3. Potential for 800MHz BW (Siglent can go up to 500MHz I think) 
4. Bigger screen resolution
5. Slightly less expensive

Rigol HDO4204 cons:
Stability and Scope app/UI seems to be not as polished as Siglent SDS2104X HD is.
HDO4204 may or may not improve significantly in time.

Anyone willing to share his opinion?

--- End quote ---

I had the 4204 here for two and a half weeks, returned it last Thursday.
And I own a SDS2504X HD...
I reported about it in the rigol 4000 and 1000 thread.
In that time the scope crashed three times, something is wrong with the acquisition, the plot only knows vector mode, so paints everything always "nicer", the FFT function is buggy and very lean equipped.
It has no bode plot function and no LA and the fans make you deaf.
The UI is good, but still a bit bumpy, the higher resolution of the display is noticeable.
As of now, it is not recommended to buy, but the software still needs a lot of tweaking.
If you "need" 4GSa/s and 800Mhz, you have to wait and hope that rigol does not do the same as with other models.
The 1000 model is so slimmed down that it can only cite the 12bit as an advantage, compared to similarly priced models like the MSO5000 and the 2000X+.
And whether that is really enough to want to have it...
Fungus:
Message deleted.
Fungus:

--- Quote from: Martin72 on February 26, 2023, 12:08:49 am ---The 1000 model is so slimmed down that it can only cite the 12bit as an advantage, compared to similarly priced models like the MSO5000 and the 2000X+.

--- End quote ---

It has the same screen and UI, which you claim are an advantage.
tautech:

--- Quote from: Fungus on February 26, 2023, 07:19:54 am ---
--- Quote from: richmit on February 25, 2023, 11:18:57 pm ---
--- Quote from: 2N3055 on February 25, 2023, 08:56:11 pm ---
--- Quote from: richmit on February 25, 2023, 05:56:58 pm ---
--- Quote from: 2N3055 on December 15, 2022, 11:21:36 am --- maybe choice not to interleave all those signals was a smart choice?

--- End quote ---

I don't quite understand this bit.  I think an example might help me most.  What is a use case where this impacts what I can do with the scope?

Thanx in advance!

--- End quote ---

It means that if you have a large signal on one channel and small signal on other, large signal might start "bleeding in" to another channel..  How important it is depends on what you do.

--- End quote ---

Ah. I see.  Thank you.  How big are we talking here?  I frequently work with 30Vp-p signals on CH1 & CH2 with 500mV on CH3 with my SDS2k+ without an issue.  Would I be able to do that with one of these HDO5K scopes?

--- End quote ---

Despite what 2N3055  says, the HDO4k has two separate ADCs. If you put the 30V signals on one ADC and the mV signal on the other then you should be OK.

--- End quote ---
Maybe you don’t understand what he said in reply #1.
Suggest you study it again for deeper understanding.
2N3055:

--- Quote from: Fungus on February 26, 2023, 07:19:54 am ---
--- Quote from: richmit on February 25, 2023, 11:18:57 pm ---
--- Quote from: 2N3055 on February 25, 2023, 08:56:11 pm ---
--- Quote from: richmit on February 25, 2023, 05:56:58 pm ---
--- Quote from: 2N3055 on December 15, 2022, 11:21:36 am --- maybe choice not to interleave all those signals was a smart choice?

--- End quote ---

I don't quite understand this bit.  I think an example might help me most.  What is a use case where this impacts what I can do with the scope?

Thanx in advance!

--- End quote ---

It means that if you have a large signal on one channel and small signal on other, large signal might start "bleeding in" to another channel..  How important it is depends on what you do.

--- End quote ---

Ah. I see.  Thank you.  How big are we talking here?  I frequently work with 30Vp-p signals on CH1 & CH2 with 500mV on CH3 with my SDS2k+ without an issue.  Would I be able to do that with one of these HDO5K scopes?

--- End quote ---

Despite what 2N3055  says, the HDO4k has two separate ADCs. If you put the 30V signals on one ADC and the mV signal on the other then you should be OK.

--- End quote ---

Dear Fungus,

You seem to misunderstood this or don't understand it well....
So let's learn together.

ANY scope that exist has a specification called Channel to Channel isolation.
It is simply what it says: a measure how much of a signal applied to channel 1 will be seen on other channels on the scope.
Which in simple terms means that (with a scope the has this CH2CH isolation at 100:1 , 40dB, for instance) if I apply 10V (P-P) signal on CH1, on CH2 (or 3 or 4 if not specified otherwise) I might get up to 100mV of visible signal bleeding on CH2 from CH1, although nothing is connected to CH2.

On a scope that has isolation of 60-70 dB that attenuation factor will be 1000-3000 times attenuated, meaning 10-30 less than other scope. that is more than order of magnitude. (Decibels for voltage are 20 x log... not 10 x log)

CH2CH isolation is going to be frequency dependent too, so not all frequencies will bleed the same and it will be less at lower frequencies..

Numbers for CH2CH isolation for Rigol are quoted form their own datasheet. And would not be bad for a 8 bit scope
because there are many 8bit scopes out there that have same order of magnitude CH2CH isolation.

You are suggesting that if you use "clever" combination of what channels to use than it would be better.
That is not true. Rigol uses both ADC interleaved to achieve 4GS/s.  From any single channel. Meaning analog routing to ADCs is running together from all channels to both ADCs in some way. Rigol by itself publishes numbers. They would very gladly claim better if they could. But they don't. And it applies to any channel combination.

But some manufacturers (like R&S) have those parameters done better (R&S has expert legacy in RF systems and know this is important and how to do it). SDS2000X HD has CH2CH isolation at the level of R&S which is first class engineering.

Unless you have access to DHO4000 and have measured yourself that CH2CH isolation is better than specified, or you have access to some data that proves better, I would stick to Rigol official figures. Maybe the will improve design and will publish better data.. But until then it is what it is. Not what we would like it to be..



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