Products > Test Equipment
Functional comparison of R&S RTB2000, Siglent SDS2000X and Keysight DSOX1000
Someone:
--- Quote from: RBBVNL9 on April 05, 2022, 07:11:55 am ---
--- Quote from: Someone on April 05, 2022, 07:06:21 am ---I do not think it is a bug, but just the way they work.
--- End quote ---
Well, even if these devices do work differently, Siglent does publish a waveform update rate. And if the actual update rate is orders of magnitude lower than what is published (see the posts of Martin72 and Performa01 referred to above, which are indeed in line with my own measurements, see my video Episode 7 at 47:27) then I think it is correct to speak of a bug...
--- End quote ---
I have not seen published/advertised waveform rates for different timebases, do you have a link/copy? Only value in the advertising/marketing is the peak:
--- Quote from: ---Waveform capture rate up to 140,000 wfm/s (normal mode), and 500,000 wfm/s (sequence mode)
--- End quote ---
We usually only see these figures across many acquisition window sizes in "competitive comparisons" or user generated figures (such as on this forum).
Many scopes have advertised "headline" or show high rates in unusual/non-typical modes such as very short memory depth and/or interpolation disabled, getting lower rates with normal memory depth and interpolation on is not wrong/bug but normal/expected.
dreamcat4:
so if this part of the series is all about detecting unusual events or glitches then...
it makes me wonder a lot how do the SDS and RTB compare to lecroy system. because in those products it seems like the most ideally executed feature. where it automatically recognized in the buffer any 'unclean' logic transition. or other such intermittent excursions. you just press a button and the scope does all of the work for you. and brings it up on the display
this feature makes me wonder what is the right lecroy scope to compare to the RTB. for example if it includes that specific feature at a low enough price point to be an alternative option to the RTB 2004
rf-loop:
--- Quote from: RBBVNL9 on April 05, 2022, 07:11:55 am ---
--- Quote ---I do not think it is a bug, but just the way they work.
--- End quote ---
And if the actual update rate is orders of magnitude lower than what is published <clip> then I think it is correct to speak of a bug...
--- End quote ---
In Siglent SDS2000X Plus data sheet (DS0102XP_E01A)
--- Quote ---Waveform capture rates up to 120,000 wfm/s (normal mode) and 500,000 wfm/s (sequence mode)
--- End quote ---
--- Quote ---Waveform capture rate (Max.)
Normal mode:120,000 wfm/s;
Sequence mode:500,000 wfm/s
--- End quote ---
--- Quote ---Waveform capture rate
Normal mode: 120,000 wfm/s max.
Sequence mode: 500,000 wfm/s max.
--- End quote ---
And same oscilloscope but now Teledyne LeCroy brand.
Teledyne test tools T3DSO2000A Data Sheet, datecode 22july20
--- Quote ---Key Features
New generation of high speed display technology
› Waveform capture rate up to 120,000 wfm/s
(normal mode), and 500,000 wfm/s (sequence
mode)
--- End quote ---
--- Quote ---Waveform Capture Rate (Max.) 120,000 wfm/s (normal mode), 500,000 wfm/s (sequence mode)
--- End quote ---
--- Quote ---Waveform Capture Rate Up to 120,000 wfm/s (normal mode), 500,000 wfm/s (sequence mode)
--- End quote ---
(bolded by me)
What is wrong now. Is it difficult to uderstand "up to" or "max"
If this is difficult I think it is education problem or lack of enough knowledge and experience. I can predict this kind of problems may lead to severe problems when need read what ever instruments or electronics, mechatronics, etc data sheets. Is it correct to say... bug in understanding data sheets. :) :)
Someone:
--- Quote from: 2N3055 on April 05, 2022, 07:29:38 am ---do you have Slow or Fast mode set there? You need to be in the dot mode also..
A small suggestion, if I may. To avoid confusion, may I suggest a wording specificum: a time that scope needs to be ready for a new trigger event can be called retrigger time. We can also use a term rearm time or even a blind time to signify time that scope is "blind" to new events while trigger engine is being rearmed for another go. I say that because saying that "scope is missing triggers" can be misconstrued as scope being ready for trigger but it didn't recognize it properly.
Difference is that first one is operating specification of the scope and the other one (missed triggers) is defect, a bug.
--- End quote ---
First I think dot mode is not a normal situation to use a scope when wanting to look at waveforms! Its these sorts of "games" that can make comparisons silly, always best to try and find a common setting that all products can meet (and mention that they can do better in their special/preferred setting).
A problem with blind time as a measure is that it is not a constant/deterministic value in most (all?) scopes when in realtime mode, it may be accurate for sequence/segmented modes where nothing is drawn to the screen.
dreamcat4:
--- Quote from: dreamcat4 on April 05, 2022, 07:49:36 am ---what is the right lecroy scope to compare to the RTB. for example if it includes that specific feature at a low enough price point to be an alternative option to the RTB 2004
--- End quote ---
ah, i remember now Martin72 had one...
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg4054573/#msg4054573
it was the WS3024Z
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