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Siglent - 11/20 - New SDS1104X-U, 4 channel 100MHz, 1Gsa/s economy oscilloscope
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rf-loop:
And here other one


Probes 100MHz = Probes included with 100MHz model
Probes 200MHz = Probes included with 200MHz model

But other thing.
I have asked this also before without answer or least I have not hit this answer.
Rigol manual and data sheet tell FFT  1200pts  and FFT in "memory mode" (what ever this is)  16kpts.

But somewhere I have seen claim about  64kpts.

Where is documented or directly displayed it is 64kpts. Who can show it or where I can find this excatly,  it is changed and when, after what Firmware version.
I like facts not rumors.
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ERROR corrected: Table is corrected. Available memory was previously wrong 14M 1Ch/7M 2 channels/ 3.5M 3 or 4 channels.

After I have tested it this is clear.

This is correct:
1Ch ON, max acquisition length 14Mpts (1x14M) max 1GSa/s
2Ch's simultaneously ON, max acquisition length for both channel 7Mpts (2x7M)  max 500MSa/s
3-4Ch's  simultaneously ON, max acquisition length for every channel 7Mpts (4x7M) max 250MSa/s

Also tested it with saving .CSV to USB.  2ms/div,  all channels on, 7M max memory. 250MSa/s.
It produce huge 490 000 488  bytes file. All 4 channels 7Msamples + header where is setttings.
2N3055:
I also need to make a not here about discussions on FFT:

Many are confusing number of sample points and number of FFT bins.

You need 2048 points to have 1024 bins..
If you sample at 1 MS/s, divided by 2048 will give you 488 Hz frequency between bins, in 1024 bins from 0Hz to 500 kHz (1/2 sampling rate).

So if a scope claims 64 KPoints of FFT, it will as a result have 32 Kbins.
It will also have 15,26 Hz resolution per bin at same 1 MS/s sampling rate.
Or 1,526 kHz per bin at 100MS/s with 50 MHz bandwidth
or 15.26kHz  at 1GS/s and 500 MHz bandwidth.

That is how you determine how much bins/points Rigol has, by figuring out best RBW at specific sampling rate/bandwidth.
Mechatrommer:

--- Quote from: rf-loop on December 06, 2020, 05:25:54 am ---Rigol manual and data sheet tell FFT  1200pts  and FFT in "memory mode" (what ever this is)  16kpts.
But somewhere I have seen claim about  64kpts.
Where is documented or directly displayed it is 64kpts. Who can show it or where I can find this excatly,  it is changed and when, after what Firmware version.
I like facts not rumors.

--- End quote ---
ok here is confesion from 1kZ owner for not the first time... the built-in 1kZ's FFT is crap! whatever it is, 64K? 16K? 2K? let call it 200 points, bottom line its crap... happy now? ps: now dont ever confuse yourself with its memory size 12M or 24M? dont bother! dont ever ask Siglent to put it in their comparison chart ok? ;D
rf-loop:

--- Quote from: 2N3055 on December 06, 2020, 11:09:41 am ---I also need to make a not here about discussions on FFT:

Many are confusing number of sample points and number of FFT bins.

You need 2048 points to have 1024 bins..
If you sample at 1 MS/s, divided by 2048 will give you 488 Hz frequency between bins, in 1024 bins from 0Hz to 500 kHz (1/2 sampling rate).

So if a scope claims 64 KPoints of FFT, it will as a result have 32 Kbins.
It will also have 15,26 Hz resolution per bin at same 1 MS/s sampling rate.
Or 1,526 kHz per bin at 100MS/s with 50 MHz bandwidth
or 15.26kHz  at 1GS/s and 500 MHz bandwidth.

That is how you determine how much bins/points Rigol has, by figuring out best RBW at specific sampling rate/bandwidth.

--- End quote ---

Yes, naturally.

And in this thing, example Siglent, and many others do not leave anything what need guess.

This is SDS1104X-U
128kpts. 131072points aka samples and 65536 bins.  In this image sampling frequency is 50MHz and this give FFT range 0 - 25MHz. (as can see it is zoomed in lot from full scale)

50MHz/2/65536 is  381.47Hz   and this information it tell always on the screen. If user have selected less length then it show it.

Then these different windows have different response. Here example "flat-top" used in example. (not very good highest freq resolution but better for level.) 

Picked up just from wikipedia.

rf-loop:

--- Quote from: Mechatrommer on December 06, 2020, 12:04:17 pm ---
--- Quote from: rf-loop on December 06, 2020, 05:25:54 am ---Rigol manual and data sheet tell FFT  1200pts  and FFT in "memory mode" (what ever this is)  16kpts.
But somewhere I have seen claim about  64kpts.
Where is documented or directly displayed it is 64kpts. Who can show it or where I can find this excatly,  it is changed and when, after what Firmware version.
I like facts not rumors.

--- End quote ---
ok here is confesion from 1kZ owner for not the first time... the built-in 1kZ's FFT is crap! whatever it is, 64K? 16K? 2K? let call it 200 points, bottom line its crap... happy now? ps: now dont ever confuse yourself with its memory size 12M or 24M? dont bother! dont ever ask Siglent to put it in their comparison chart ok? ;D

--- End quote ---

All we know this,  but question was what it is in scope itself. I wonder what makes it so difficult.
If I have DS1kZ on my table I know it after 2 minute if not sooner and I have answer for this kind of simple question.
Also I have not get answer if Rigol "record" frames can afterwardd use for automatic measurements, for FFT, for decode etc. They advertise it like it is seqmented acquisition...
About Siglent we have lot of data and details what it is and what not... but about Rigol... nearly like "guess what is this - play".
Do peoples buy these just for decorating some hobby corner or just playing some fun.

So, without further data/knowledge, there is user manual and data sheet what tell it is 16kpts in  "memory mode" -  what ever it is. I keep this as fact, until some data what overrides this information.

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