Products > Test Equipment
Functional comparison of R&S RTB2000, Siglent SDS2000X and Keysight DSOX1000
RBBVNL9:
Dear seronday,
--- Quote --- It is possible to transfer a waveform from one of the vertical channels to the Arbitrary Waveform Generator.
This is done from the vertical channel menu dialog box.
One of the menu items is " Apply To ".
Selecting " Apply To ", brings up a list of options, one of these is ARB.
This copies the current channel waveform to the Arbitrary Waveform Generator.
You can then go to the Arbitrary Waveform Generator and select "Stored" and then " Channel' to output the waveform.
--- End quote ---
That is wonderful! I just tested it and it indeed works. In fact, the very moment I tick "Apply To" in the vertical channel menu the wave appears on the output of my AWG (at least when it is turned on), so there seems to be no need in the AWG menu to go to "Stored" and "Channel". The latter only seems relevant if you in-between switch to another AWG waveform and want to go back to the captured one again.
Just for the sake of completeness: a week before I said in my video I did not get this to work, I did already posted my problem in the EEVBLOG forum but no one seemed to be able to provide a solution at that time...
But you are the one who provides the solution so compliments go out to you!
--- Quote ---This is mentioned in the User Manual in section 12.2, Channel Setup, but the way it is explained is somewhat confusing.
--- End quote ---
True. In the last weeks, I went through the manual as well as all the device menu's quite carefully but missed this. Even searched the manual on keywords "ARB" and "Arbitrary' with no success, but I see in Section 12.2 they do not use these terms... Anyway, this information should really have been in the part of the manual that describes the ARB (like Section 28.3)!
pdenisowski:
--- Quote from: RBBVNL9 on March 28, 2022, 06:56:30 am ---Dear Egonotto,
--- Quote ---I think they mean the frequency is max 10 MHz and 250 Ms/s.
--- End quote ---
Yes, that does make sense. The sample rate indeed needs to be more way than the 10 MSa/s R&S mention in the specifications in order to output the waveform you show (and assuming it would be the same on the RTB as the RTA). I agree with you it is likely the same 250 MSa/s as used for the regular waveform generation. Will update my overview document. Thanks for checking!
--- End quote ---
Hi Rudy - Not 100% sure about the question here, but the waveform generator in the RTB2000 (option RTB-B6) does have a sample rate of 250 MSamples/sec (as per the specifications)
https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_common_library/dl_brochures_and_datasheets/pdf_1/RTB2000_dat-sw_en_3607-4270-22_v1600.pdf
Incidentally, I just did a video walkthrough on the basics of using the RTB2000 function generator.
RBBVNL9:
Dear pdenisowski, thanks for the reply.
The discussion above is (specifically) about the sample rate for the arbitrary wave function.
For this, the RTB2000 specifications (V.1600) you refer to mention: "Sample rate: max. 10 Msample/s" and "Memory depth: 16k points" (see screenprint attached, yellow highlights)
Document R&S RTx-B6 ARBITRARY WAVEFORM AND 4 BIT PATTERN GENERATOR (Version 01.10, May 2020), for the RTB series, reads "Signal forms frequency ranges (arbitrary): max. 10 Msample/s; 32k points" (see screenprint attached, yellow highlights)
I think that in both documents, the 10 Msample/s is an error and should probably be 250 MSa/s (otherwise it could not generate the waveforms it actually does in practice!). Moreover, in the specifications, the 16k points is probably an error and should be 32k, as confirmed by tests in practice.
PS thanks for the walkthrough video, just looked at it!
RBBVNL9:
Preparing for a new video on observing infrequent events and mask tests, and seeing huge differences there, so I thought I should first dig a bit more into actual triggering behaviour.
I see something I am not sure I understand well.
In short:
- I feed all oscilloscopes with a 1kHz square wave on channel 1.
- I set the horizontal time base such that I see two periods on the screen (200uS/DIV on the SDS and DSOX, and 170uS/DIV on the RTB as it has 12 instead of 10 horizontal divisions). Attaching a pic.
- I activate the trigger out on each device and look at these on a fourth oscilloscope (a PicoScope 3405D). Channels are 1: RTB, 2: SDS, 3: DSOX and 4: input square to scopes.
All scopes are set to regular trigger settings (trigger on positive edge, level halfway square, no holdoff, DC coupling, no noise reject or filter). Record length / memory depth is chosen for best results, if there is any difference. Segmented acquisition off. Auto trigger or normal trigger makes no difference on any of the devices. Lastly, on the RTB I set the trigger out a pulse to 1mS to make it well visible (using SCPI command TRIGger:OUT:PLENgth 1E-3).
Ideally, I would expect to see a trigger every one out of three periods (where the positive edges of the two other periods are shown on the screen), so a constant 333.3 pulses per second on the trigger out bus. After all, 1kHz is such a slow signal and any eventual blank time these scopes need to write to memory etc. should be neglectable.
The results are in the attached screen print.
- The Keysight DSOX behaves exactly as expected, triggering every third period.
- The Rohde & Schwarz RTB mostly every third period but there are some (predictable) interruptions. Is the scope doing something else every once in a while ?!?
- The Siglent SDS triggers much, much less. Only 30 pulses per second instead of the expected 333.
Can anyone enlighten me? Why does the RTB have periodic interruptions? And, more importantly, why is the SDS so slow to re-trigger ?!?
Do I overlook relevant device settings?
Thanks for your insights!
egonotto:
Hello,
my conjecture: RTB and SDS take time to execute the samples. Meanwhile they do not sample.
RTA behave little wilder.
Best regards
egonotto
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