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Oscilloscope Bode Plot Speed Comparison

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Martin72:
Hi,



--- Quote ---
--- Quote from: mawyatt on June 20, 2023, 04:24:49 pm ---Anyway, maybe someone with various instruments (1000, 2000, 5000 & 6000 series) at hand could do a comparison of Bode Function speed? Would be interesting to see if the newer Siglent instruments are significantly faster than the entry and mid level devices. This might hint at where the bottleneck is regarding speed.
--- End quote ---

Hehehehe.... ;)
I got a SDS1104X-E and my SDS2540X-HD at home, and access to a SDS2104X+ at work.
As I´ve tested the batronix demoboard, bodeplot with the 1104X-E was the fastest.
Could re-test it again, making sure the settings were all the same.


--- End quote ---
https://www.eevblog.com/forum/testgear/oscilloscope-recommendation-ds1054z-sds1104x-e-gds-1104b-etc/msg4919146/#msg4919146

To keep the other thread "clean", I open up a new one.
This is not meant to be a "mine is longer than yours" thread, just a matter-of-fact observation of how quickly each scope processes a single sweep pass.
The conditions should be as equal as possible, otherwise it makes no sense.
I can contribute measurements with an SDS2104X+, an SDS2504X HD and an SDS1104X-E.
The means:
-Demoboard from Batronix with lowpass and bandpass filters(or similar filter)
-External frequency generator via USB, also for the two SDS2000s, since the SDS1104X-E has no internal one.
-Frequency range: 200Hz...10Mhz
-Frequency mode: Decade
-Number of measurement points per decade: 105
-Amplitude: 0.71Vrms
-1st pass with one DUT output (lowpass)
-2nd pass with two DUT outputs (lowpass and bandpass)
-3rd pass with three DUT outputs (LP,BP and "Linear", i.e. signal input)

Today I did this at work with a SDS2104X+, here are the results:

1.pass: 7min37sec
2nd pass: 8min46sec
3rd pass: 10min21sec

At the weekend the 2504X HD and the 1104X-E will follow, I will make a table.
Gladly seen are further results, from other models, like e.g. SDS5000X, SDS6000, Rigol MSO5000 and the R&S models.
Conditions are clear, the same means must be applied.
Then we can see what other tests we can do under what conditions.

jjoonathan:


Anritsu MS4630B:
10Hz-10MHz
1st pass: 200ms
2nd pass: 200ms
3rd pass: N/A (not enough channels)
Points: 501
Dynamic Range: 109dB (noise floor with input terminated, settings unchanged -- you can eek out more by sweeping slower)



--- Quote ---This is not meant to be a "mine is longer than yours" thread
--- End quote ---
Exactly, it's a "mine is shorter than yours" thread!

Kidding aside, I would love to save the space and get rid of my low frequency network analyzer, even if it meant settling for something significantly less good. Unfortunately the integrated oscilloscope bode plotters I've seen are so terribly slow that I am not even tempted. Hopefully this will change, or has changed and we'll see proof in this thread -- but live updates are something I won't live without. They calibrate your intuition as to the quality of your setup and the sensitivity to environmental factors, fixturing, etc that you just don't get with "go get a coffee" sweep times.

Martin72:
Hi,


--- Quote ---Anritsu MS4630B:
--- End quote ---

Nice to know how fast it can go - when you don´t use a scope for it.
Not really comparable in the sense of this thread.

jjoonathan:
Scopes could plot this fast if they tried. I suspect they could hit the dynamic range too, possibly with a few caveats on the limitations of process gain. Scope bode plots don't suck because the architecture forces them to suck, they suck because they aren't trying very hard. What we have now are bode plots written by interns using SCPI functions, not bode plots written by graybeards using verilog.

Now that I've said my piece I'll stand aside and enjoy the sloth race  :popcorn:

nctnico:

--- Quote from: jjoonathan on June 22, 2023, 09:44:27 pm ---Scopes could plot this fast if they tried. I suspect they could hit the dynamic range too, possibly with a few caveats on the limitations of process gain. Scope bode plots don't suck because the architecture forces them to suck, they suck because they aren't trying very hard. What we have now are bode plots written by interns using SCPI functions, not bode plots written by graybeards using verilog.

--- End quote ---
I don't think that is entirely true. What oscilloscopes lack is steep filters in hardware so there is quite a bit of processing involved so sift through the incoming signal. The R&S RTM3004 needs about 80 seconds to do a sweep from 200Hz to 10MHz which is over 5 times faster compared to the Siglent scope. I doubt the RTB2004 is slower as the basic platform is mostly the same.

BTW: I have an Anritsu MS4630B as well which I use for my frequency analysis needs (paid around $450 for it which was money well spend).

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