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Siglent SDS1104X-E In-Depth Review

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rf-loop:

--- Quote from: Cpx on May 03, 2019, 01:02:17 am ---Does this scope have have channel digital filers hidden somewhere?
From my current research i couldn't find any :(.


--- End quote ---

No.

Digital side filters are good in some situations with some notes related to aliasing and this depends also if filter input data is true full samplerate or if it use decimated samples. Filter itself do not know if filter input signal is ADC produced alias or true signal. So user need some times be careful and not always blind believe results.
Only really trusted filters are in analog side before ADC. Now and for (nearly) ever.

Of course SDS1000X-E  still have some in digital side but they do not name it as filter.
It works like  low pass filter but is in digital side.
And user can not adjust it using corner frequency. Not very handy but more than nothing.

Eres acts like Low Pass Filter. 

It is explained here (note that all details are not same in Siglent but still useful to read, same principles. http://cdn.teledynelecroy.com/files/appnotes/an_006a.pdf

Example (LeCroy AN-006A, table 1) with full 1GSa/s  3bit Eres is around 8MHz LPF.
With 10MSa/s it is like 80kHz LPF.
I have not measured with Siglent but roughly in same ballpark.

JPortici:

--- Quote from: rf-loop on May 03, 2019, 07:10:06 am ---Eres acts like Low Pass Filter.

--- End quote ---

but you can't set the corner frequency, and you don't have highpass/bandpass/notch.
I would find digital filters to be useful to look at for example pwm signal. One can use the integrator math operator in conjunction with the offset to produce something that resembles a LPF but the result is rather poor. Same with HPF/Differentiator.
Another is to filter out specific content, BEFORE doing further analysis

Is there a plan to add them? I remember reading something about it a long time ago..

2N3055:

--- Quote from: rf-loop on May 03, 2019, 07:10:06 am ---
--- Quote from: Cpx on May 03, 2019, 01:02:17 am ---Does this scope have have channel digital filers hidden somewhere?
From my current research i couldn't find any :(.


--- End quote ---

No.

Digital side filters are good in some situations with some notes related to aliasing and this depends also if filter input data is true full samplerate or if it use decimated samples. Filter itself do not know if filter input signal is ADC produced alias or true signal. So user need some times be careful and not always blind believe results.
Only really trusted filters are in analog side before ADC. Now and for (nearly) ever.

Of course SDS1000X-E  still have some in digital side but they do not name it as filter.
It works like  low pass filter but is in digital side.
And user can not adjust it using corner frequency. Not very handy but more than nothing.

Eres acts like Low Pass Filter. 

It is explained here (note that all details are not same in Siglent but still useful to read, same principles. http://cdn.teledynelecroy.com/files/appnotes/an_006a.pdf

Example (LeCroy AN-006A, table 1) with full 1GSa/s  3bit Eres is around 8MHz LPF.
With 10MSa/s it is like 80kHz LPF.
I have not measured with Siglent but roughly in same ballpark.

--- End quote ---

I believe you misunderstood.
We are talking about user filters (Keysight and Rigol have them in Math, GW Instek has an App) whose purpose to apply filters to signals as way to  look at the signal. Instead of having signal routed trough some device to filter out what you don't want to see, you can do it on the scope. It is also useful to experiment how signal would look if you were to apply some filter etc..
On higher end LeCroy scopes you have Filter Toolbox so you can create and and test filters for your signal on a scope as a part of a design process..

I expect it to be added at least to new 5000 series, although there is no technical reason that would prevent it from being added to 1000 and 2000 series. They are more than powerful enough.

Rerouter:
The other scopes seem to use a FIR filtering scheme, where it generates a coefficient for the filter type you want, then just processes through the sample memory to spit out a math trace that is the filtered waveform,

In the scheme of things it does not seem to be an expensive operation, https://pdfs.semanticscholar.org/061d/3f5263b1a7e2f7b2d98f87d95257a123e1ae.pdf

But I am not familiar enough with editing at assembly level to understand how one could patch it in. I know the menu / help tool tips structure still exists in the scope configuration and is switched off, but Its not clear where that switch is. or if the related functions are still compiled in.

tautech:

--- Quote from: Cpx on May 03, 2019, 01:02:17 am ---Does this scope have have channel digital filers hidden somewhere?

--- End quote ---
The best filters are the ones between you ears and knowing how to use them.

Filters, I do not want to risk removing any info but rather enhance it so we first apply the filter between ears and then the tools the scope provides.
When we connect a scope to DUT we do not always see nice lines that clearly show the info we seek but with enough sampling and WFM/s we know the info is there and then operator skill is required to display the info without losing important information.

There are some powerful Display and Acquisition tools without even engaging all the Trigger tools.
DPO is not to be overlooked too.
A few screenshots without resorting to any triggering or BW limit tools.

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