Author Topic: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes  (Read 293673 times)

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Offline Fungus

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1750 on: November 29, 2020, 08:52:13 pm »
Is this also possible with the Siglent?
Capture memory management strategy is mirrored to the same strategies used by LeCroy and Pico.

... snip mumbo jumbo

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Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1751 on: November 29, 2020, 11:03:58 pm »
The Single or Stop capture memory depth is just what is on the display and detailed inspection of it is limited to zooming in and panning around within the original capture therefore zooming in on a 1ms/div capture at 1us/div offers a large record to inspect.

OK. So the idea is, if I want to capture a long sequence around a particular trigger, then slow down the horizontal sweep until the full memory that I want to retain is on screen.  For example if I am just looking at one channel and want to use the full 14 Msamples, then at 1 Gsample/second I need to capture 14 msec.  So slow down the sweep to 1msec/division, then do single shot.

After I have that, I can then scroll along to any point in that 14 msec of data, and use the horizontal control to zoom in as much as needed.

Is that right?  So the only difference with the Rigol is that I need to deliberately slow the sweep in advance rather than expecting a long data stretch to "just be there".  That's not unreasonable.




 
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Offline tautech

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1752 on: November 29, 2020, 11:31:17 pm »
The Single or Stop capture memory depth is just what is on the display and detailed inspection of it is limited to zooming in and panning around within the original capture therefore zooming in on a 1ms/div capture at 1us/div offers a large record to inspect.

OK. So the idea is, if I want to capture a long sequence around a particular trigger, then slow down the horizontal sweep until the full memory that I want to retain is on screen.  For example if I am just looking at one channel and want to use the full 14 Msamples, then at 1 Gsample/second I need to capture 14 msec.  So slow down the sweep to 1msec/division, then do single shot.

After I have that, I can then scroll along to any point in that 14 msec of data, and use the horizontal control to zoom in as much as needed.

Is that right?  So the only difference with the Rigol is that I need to deliberately slow the sweep in advance rather than expecting a long data stretch to "just be there".  That's not unreasonable.
Yes exactly this ^ although I should add that when using 2 channels due to there's 2 ADC's in 4ch X-E's you can place the 2nd channel on the other ADC which also offers 14 Mpts of memory support therefore not halving the memory depth or sampling rate like scopes that have a single ADC.

Also don't overlook the convenience of Zoom mode where there's always the full picture of what's going on and the settings in play although due to just the 7" display sadly Zoom mode splits the vertical 50/50 whereas some scopes offer a 70/30 split where there is less clutter when you have a lot going on such as 3ch decodes and decode tables etc.

Edit
However to reduce display clutter you can Hide traces and have them still influence the way the scope works such as hiding a Clk or CS.

Edit
From early in this thread before all info was added to channel tabs, this image shows Zoom mode using channels on each ADC where the full 14 Mpts is available at slow timebase settings.
Zoomed window is so magnified the marker stripe of the zoomed timebase is nearly invisible below the H Pos arrow at the top of the display.

« Last Edit: November 30, 2020, 12:38:41 am by tautech »
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Offline HendriXML

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1753 on: December 03, 2020, 01:31:40 pm »
I'd like to read the complete state of the scope using SCPI commands to be able to reload it later on. With most parameters this can be done, but I seem to have found 2 exceptions:
* The visibility of the trace (wether its enabled, but hidden)
* The "Enhanced by bits" parameter of the aquisition.

Maybe I'm missing something? I know a binairy version of the state can be retrieved with a single command, but because that format is not documented, I wouldn't want to take that road. Also when only different parameters values (determined by reading the current state) are set using dedicated commands this is much faster (depending on the number of differences). The saved state should also be editable, thus no simple binairy reading and the writing the same stuff.
« Last Edit: December 03, 2020, 03:26:53 pm by HendriXML »
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Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1754 on: December 03, 2020, 04:44:37 pm »
 I just got a Siglent SDS1104X-E today.  I'm already happier with this than with the Rigol 1054Z that it replaced.  The traces behave as I expect when I zoom, the individual ADC values behave as I would expect, and the input noise is significantly lower.  It took about 5 minutes to generate and enter the SDS1204X-E upgrade key, so that was also good.

One question: when I open the web interface from my computer, I see the display very nicely.  But according to the documentation, I should also have access to controls from my computer brower.  But they're missing!  Is it possible to control the scope from a networked computer, and if so, where are the controls?
 

Offline bkmit

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1755 on: December 03, 2020, 05:18:13 pm »
[attachimg=1] Tap this button!
 
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Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1756 on: December 03, 2020, 05:40:21 pm »
Thank you!!! Tapping that thin blue button on the top right opened the controls.  I had not seen it!
 

Offline tautech

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1757 on: December 03, 2020, 07:03:44 pm »
I'd like to read the complete state of the scope using SCPI commands to be able to reload it later on. With most parameters this can be done, but I seem to have found 2 exceptions:
* The visibility of the trace (wether its enabled, but hidden)
* The "Enhanced by bits" parameter of the aquisition.

Maybe I'm missing something? I know a binairy version of the state can be retrieved with a single command, but because that format is not documented, I wouldn't want to take that road. Also when only different parameters values (determined by reading the current state) are set using dedicated commands this is much faster (depending on the number of differences). The saved state should also be editable, thus no simple binairy reading and the writing the same stuff.
Yep, looking at:
https://int.siglent.com/u_file/document/ProgrammingGuide_PG01-E02C.pdf
Neither of these seem available.  :-//

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Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1758 on: December 03, 2020, 09:17:59 pm »
I have a Siglent SDS1104X-E hacked to 200 MHz and have installed the WiFi option.  At the moment I have no plans to get or use the Arbitrary Waveform Generator (AWG) or the Logic Analyzer (LA) but was wondering, is there any reason NOT to install them?  Will it have any negative effect on performance or in some other way?  If not, I might as well install them, perhaps in a few years some cheap AWG or LA hardware will turn up on Ebay.
 

Offline tautech

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1759 on: December 03, 2020, 10:38:34 pm »
I have a Siglent SDS1104X-E hacked to 200 MHz and have installed the WiFi option.  At the moment I have no plans to get or use the Arbitrary Waveform Generator (AWG) or the Logic Analyzer (LA) but was wondering, is there any reason NOT to install them?  Will it have any negative effect on performance or in some other way?  If not, I might as well install them, perhaps in a few years some cheap AWG or LA hardware will turn up on Ebay.
Not at all however you have 30 free trial uses for any options so they are effectively active already albeit only for 30 uses.
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Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1760 on: December 05, 2020, 07:36:41 am »
I am liking my hacked SDS1104X-E a lot.  Features that I like in comparison with the DS1054Z that I returned include:

- display is a simple 1-1 mapping of the data (no disappearing data in dots mode)
- the heat map "color mode" display looks as if it will be useful
- lower input noise/higher vertical sensitivity
- the built-in web server works well, and it's easy and cheap to add WiFi capability
- able to quickly drop data files/snapshots on my desktop via the web
- the FFT works very well (I've only played around with the calibrator signal)

One thing I would find useful is to have horizontal sweep settings much slower than 100s/division, for data logging.  For example I'm just replacing the crappy NiCd batteries & charging circuit in a precision clinometer (Talyvel 4) with a constant current source + battery managament/balance board + 18650 lithium ion batteries.  The meter was set to show a "low batt" indicator when either the positive or negative battery rail drops below 7v.  I'd like to adjust that threshold to indicate (say) 2 hours of remaining battery life.  But what is that?  Ideally I would connect one channel each to the positive and negative battery supply, and one channel each to the regulated +-5V internal rails.  Then just run it for a day, logging (say) 100 data points/second = 36,000/hour for 10 hours.  A quick look at the plots would let me see when the regulated rails drop below 5V, then I can see what the battery voltage is, 2 hours before that.

I'm sure that there are data loggers just for this, and yes I can rig up a script on my laptop to do the logging. But would be nice to just do it on the scope.  If there were horizontal sweeps going to 5000 or 10000 secs/division that would do it nicely.

« Last Edit: December 05, 2020, 07:44:45 am by ballen »
 

Offline tautech

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1761 on: December 05, 2020, 07:48:37 am »
 :)
Maybe you can be tempted to get the right tool for that job like one of these:
https://int.siglent.com/products-overview/sdl1000x/
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Offline rf-loop

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1762 on: December 05, 2020, 09:32:19 am »
I am liking my hacked SDS1104X-E a lot.  Features that I like in comparison with the DS1054Z that I returned include:

- display is a simple 1-1 mapping of the data (no disappearing data in dots mode)
- the heat map "color mode" display looks as if it will be useful
- lower input noise/higher vertical sensitivity
- the built-in web server works well, and it's easy and cheap to add WiFi capability
- able to quickly drop data files/snapshots on my desktop via the web
- the FFT works very well (I've only played around with the calibrator signal)

One thing I would find useful is to have horizontal sweep settings much slower than 100s/division, for data logging.  For example I'm just replacing the crappy NiCd batteries & charging circuit in a precision clinometer (Talyvel 4) with a constant current source + battery managament/balance board + 18650 lithium ion batteries.  The meter was set to show a "low batt" indicator when either the positive or negative battery rail drops below 7v.  I'd like to adjust that threshold to indicate (say) 2 hours of remaining battery life.  But what is that?  Ideally I would connect one channel each to the positive and negative battery supply, and one channel each to the regulated +-5V internal rails.  Then just run it for a day, logging (say) 100 data points/second = 36,000/hour for 10 hours.  A quick look at the plots would let me see when the regulated rails drop below 5V, then I can see what the battery voltage is, 2 hours before that.

I'm sure that there are data loggers just for this, and yes I can rig up a script on my laptop to do the logging. But would be nice to just do it on the scope.  If there were horizontal sweeps going to 5000 or 10000 secs/division that would do it nicely.

There is one thing what can use for some kind of things. No it is not continuous and it have some limits but. There was long time ago I need watch some system and need know roughly how long it takes when something happen. There 1 second resolution was enough and I have just one oscilloscope for collect data.

Solution was. Use SDS1000X-E  History buffer because I realize I do not need just continuous  trace.

There is up to 80000 wfms buffer.
Then I think it is enough I get one mesurement every one second. I need data, not beautiful nice curve or other trend.
Do I need generator what trig scope every second.  ... well, no. There are timers in Trigger menu! Example trig Holdoff, up to 1.5s. So just set for 1s and fine adjust for best result.

And if set 10us div then get 140 samples to memory every second. If it is near DC also can look samples average then later after all collected.  of course for more short time data log it can adjust very different but always there is some dead time between segments.
After 80000 second memory is full. Then open history and start looking. Also there can see time stamp where can look perfect relative time of these "segments". 

One form of "datalogger."





Of course speed, one segment size etc can adjust as need and how is possible. Alone with scope without any extra can do this. Interval can change. Of coutse there is limits and  need look what is optimal for needs .. if it is possible depends what is real need.
Just one application hint.

Long time I have wished they add more range for t/div. Just change some parameter in system software, it do not cost "anything".  1000s/div least... if not more. This give over 3.8h continuous data so please least 2000s for some tiny and simple discharge "monitor" or what ever.  But this history method have advantage that user can look one segment average.
« Last Edit: December 05, 2020, 09:34:43 am by rf-loop »
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Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1763 on: December 05, 2020, 09:46:04 am »
Maybe you can be tempted to get the right tool for that job like one of these:
https://int.siglent.com/products-overview/sdl1000x/
 

Given that I might do something like this a couple of more times in my lifetime, not worth it.  Also, it's not really the right tool.   I want to drain the batteries with the Talyvel (which is not a constant load and drains the +- supplies at a different rate) and monitor the internal supply voltage of that at the same time as I monitor the batteries.

EDIT: I just realised the RF-LOOP has provided a perfect and simple solution!
 

Offline ballen

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1764 on: December 05, 2020, 09:49:22 am »
Solution was. Use SDS1000X-E  History buffer because I realize I do not need just continuous  trace.

Do I need generator what trig scope every second.  ... well, no. There are timers in Trigger menu! Example trig Holdoff, up to 1.5s. So just set for 1s and fine adjust for best result.

And if set 10us div then get 140 samples to memory every second. If it is near DC also can look samples average then later after all collected.  of course for more short time data log it can adjust very different but always there is some dead time between segments.
After 80000 second memory is full. Then open history and start looking. Also there can see time stamp where can look perfect relative time of these "segments". 

One form of "datalogger."

Thank you, that's a perfect solution!!

EDIT: I've been playing around to get this to work, and realised that I don't understand history/sequence/frames.  I've tried to read the manual, but this part is not well written, and I have not figured out how to make this work other than randomly.  Is there a written explanation somewhere, or a video online, that demonstrates/explains this?  Note: I am coming from the analog/CRT scope world, so this is probably just lack of experience.  But I have no internal mental model for how frames/sequences/history works.  What's going on under the hood?

EDIT 2: Google searching identified this document, which explains the general idea.  But I still need a step-by-step tutorial, and a better mental model of what's going on inside the black box.
https://siglentna.com/operating-tip/siglent-x-series-oscilloscopes-sequence-history-mode/

EDIT 3:  OK, I learned that in acquire mode you don't see anything on the screen, and with a 1 second holdoff, any adjustments to gains etc take 1 second to shown on the display!

Anyway, by setting a very fast horizontal sweep, I can capture 70 points per sample.  So setup AC line as the trigger, holdoff 1 second.  Then log voltages on Ch 1-4.  Set desired sequence number to max value  80k and start.  This logs 70 points every 1 second.  80,000 seconds is 22 hours, which is plenty of time.  Then I just scroll through the frames to identify when the voltage has dropped to the desired level. 

« Last Edit: December 05, 2020, 12:13:14 pm by ballen »
 

Offline HendriXML

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1765 on: December 05, 2020, 10:15:42 am »
Solution was. Use SDS1000X-E  History buffer because I realize I do not need just continuous  trace.

Do I need generator what trig scope every second.  ... well, no. There are timers in Trigger menu! Example trig Holdoff, up to 1.5s. So just set for 1s and fine adjust for best result.

And if set 10us div then get 140 samples to memory every second. If it is near DC also can look samples average then later after all collected.  of course for more short time data log it can adjust very different but always there is some dead time between segments.
After 80000 second memory is full. Then open history and start looking. Also there can see time stamp where can look perfect relative time of these "segments". 

One form of "datalogger."

Thank you, that's a perfect solution!!
I once had some fun with using the scope for very precise ( 0.1 mV precision at around 1.2V) datalogging.

https://www.eevblog.com/forum/testgear/battery-charging-using-a-siglent-sds1104x-and-spd3303x/msg2864724/#msg2864724

Just to give an idea what is possible using scripts.
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Offline HendriXML

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1766 on: December 05, 2020, 11:44:43 pm »
EDIT: I've been playing around to get this to work, and realised that I don't understand history/sequence/frames.  I've tried to read the manual, but this part is not well written, and I have not figured out how to make this work other than randomly.  Is there a written explanation somewhere, or a video online, that demonstrates/explains this?  Note: I am coming from the analog/CRT scope world, so this is probably just lack of experience.  But I have no internal mental model for how frames/sequences/history works.  What's going on under the hood?
Instead of using the full buffer for one capture, thus one trigger. It handles more triggers by filling parts of the buffer (segments/frames) in sequence.
Analogy:
Instead of taking one photo, its more like recording a movie.
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Offline tautech

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1767 on: December 06, 2020, 12:57:55 am »
EDIT: I've been playing around to get this to work, and realised that I don't understand history/sequence/frames.  I've tried to read the manual, but this part is not well written, and I have not figured out how to make this work other than randomly.  Is there a written explanation somewhere, or a video online, that demonstrates/explains this?  Note: I am coming from the analog/CRT scope world, so this is probably just lack of experience.  But I have no internal mental model for how frames/sequences/history works.  What's going on under the hood?
Instead of using the full buffer for one capture, thus one trigger. It handles more triggers by filling parts of the buffer (segments/frames) in sequence.
Analogy:
Instead of taking one photo, its more like recording a movie.
Yes with the invisible 56 Mpt (IIRC) History buffer that runs continuously alongside the 2x 14 Mpts of memory depth.
Simply your s/div setting and its corresponding memory depth determines how many History frames can be filled.
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Offline rf-loop

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1768 on: December 06, 2020, 06:06:23 am »


EDIT: I've been playing around to get this to work, and realised that I don't understand history/sequence/frames.  I've tried to read the manual, but this part is not well written, and I have not figured out how to make this work other than randomly.  Is there a written explanation somewhere, or a video online, that demonstrates/explains this?  Note: I am coming from the analog/CRT scope world, so this is probably just lack of experience.  But I have no internal mental model for how frames/sequences/history works.  What's going on under the hood?


It is explained bit more but unfortunately "scrambled by natural enigma". Our "enigma" is our Finnish language what is said is second difficult after Chinese in world. 
In some images there is some english/finglish explanations. But more deep text explanations just with Finnish.
Originally intention have been also make it English but... first I need The Perfect version by Finnish and now it is not this level. Images and text are preliminary versions that have been intended to be improved - later. Partially these are based SDS1000X versions and then SDS1000X-E versions. But one problem have been just this... models after models, FW verssions after FW versions and neve can know what next version change details or add functions and functionality.  So these are more or less partially obsolete. Always they are. 
But, The Principle is same. 

About wfm speed and history/sequence buffer with different settings. txt by Finnish
Including some wfm speed explanations and tables  with some settings about segments and memory and total memory
Most relevat images from there.
Note: If do not need fast sequence, same can do just in normal mode when current wfm speed is enough. BUT there is one exception. If it is important to set perfect number of segments it is not possible in normal mode. History use in this case just max history FIFO length, until you interrupt acquisition after any change before FIFO is full and start overflow.
Every settings change reset FIFO and force start from zero in normal mode. Sequence mode have twi modes, repeating or single sequence.







Then some explanation about always background working continuous wfm history buffer (FIFO). Txt by Finnish

Most important images from there. Note that principle is same also in SDS1000X-E





ETA:NOTE: All these tables may have some inaccuracies due to FW changes after these tables made.
This is big problem today. All documents goes to obsolete class faster and faster.
When old times I use some analog scope it stay same years after years, all manuals and verty detailed manuals was more than perfect and errata sheets quite rare.




« Last Edit: December 06, 2020, 11:05:09 am by rf-loop »
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Offline HendriXML

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1769 on: December 06, 2020, 10:31:14 am »
EDIT: I've been playing around to get this to work, and realised that I don't understand history/sequence/frames.  I've tried to read the manual, but this part is not well written, and I have not figured out how to make this work other than randomly.  Is there a written explanation somewhere, or a video online, that demonstrates/explains this?  Note: I am coming from the analog/CRT scope world, so this is probably just lack of experience.  But I have no internal mental model for how frames/sequences/history works.  What's going on under the hood?
Instead of using the full buffer for one capture, thus one trigger. It handles more triggers by filling parts of the buffer (segments/frames) in sequence.
Analogy:
Instead of taking one photo, its more like recording a movie.
I wasn't aware of the buffer being used to its capacity in normal mode as well (building up history), that really nice to know!
I saw multiple waves stacked on each other,  but never gave it much thought.
The reason for this might be because I don't like fiddling with a scope that much (its location on the bench is not optimal), hence the reason to have it setup with scripts  :-+. Also when I like to inspect a waveform in detail I transfer it to Excel and do the zooming and stuff using Excel. That way one can also get very readable graphs (quantities on axis) with some benefits of being able to add datalabels).
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Offline thaistatos

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1770 on: December 06, 2020, 09:07:26 pm »
anyone (in Germany) interested on short notice:
Meilhaus has these scopes on sale. (until midnight).
 
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Offline masterx81

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1771 on: December 06, 2020, 09:20:15 pm »
At 437.92€ shipped to italy the 1104x-e! Really good price, best seen. Finally, got one! Thanks for the info!
 

Offline kcbrown

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1772 on: December 06, 2020, 10:34:46 pm »
Can someone here describe *exactly* how the slope triggering works?   Because it looks to me like it's buggy.

Here's my setup:

The waveform is an asymmetric triangle wave with a period of about 17 milliseconds, and a voltage range of 3V to just over 5V, with the rising edge taking about 4ms and the falling edge taking about 13ms.

And the trigger definition I'm using is as follows:

Type: slope
Slope: rising
Voltage boundaries: 3.5V to 4.5V
Limit range type: [-- . --]
Limit range values: 1.2ms to 1.4ms
Noise reject: off


Now, if I'm not mistaken about how the trigger setup above is supposed to work, this should result it in triggering *only* if it finds that the signal first passes upwards through 3.5V and then, 1.2 to 1.4ms later, passes upwards through 4.5V, yielding a slope of between 714 and 833 V/s.

The problem is that it is triggering occasionally on the *falling* edge of the waveform.  I can easily detect this by setting up a mask and telling it to stop upon violation of the mask.  I'm performing the capture at a full 14 million points for maximum resolution.  When I zoom in I can see that there's noise, but I'm unable to find noise such that there's a rising edge passing through 3.5V (I am able to see the second one passing through 4.5V some 1.2 to 1.4 ms later, which is that point at which the trigger fired).  The latter should be, and is, visible at the trigger point, so the latter condition is being met.  But I can't find the corresponding starting point.  The voltage at -1.2ms is around 4.66V and at -1.4ms is around 4.70V, so the amount of noise that would be needed for it to see a rising edge passing through 3.5V is at least 1.16V.  But the maximum amount of noise I'm able to see in the captured waveform looks to be about 250mV, far less than what would be needed to fire the starting condition of the trigger.  As such, I cannot find any reason for the trigger to be firing here.  The very definition of the trigger should be immune to false triggering on the downwards slope as long as there isn't a pair of rising edges separated by both the defined voltage difference *and* the defined time differences, something that should be impossible if the maximum noise excursion is well below the difference between the specified voltages.  And yet, it *is* triggering in that fashion.  The only way to prevent that from happening is to tell it to reject noise, but in light of the trigger definition, that shouldn't be necessary at all ... unless the triggering mechanism doesn't work the way I think it does.

And hence, my question: how *exactly* does the slope triggering mechanism work, and why would it be triggering on noise in the seeming absence of an initial rising edge that meets the defined criteria?

I realize that it's possible for the triggering mechanism to see something that isn't being captured, but this seems to be consistent: I *never* see the starting condition captured in the waveform.  I even went to the trouble to export the entire 14M points worth of waveform to a CSV and ran a program to show the minimum voltage seen between -1.4ms and 0ms, and the value I get back is 4.33 volts at -6.432 us.  That's well above the 3.5 volts that a rising edge would have to pass through to meet the starting condition requirement.  I can attempt to attach the CSV if someone is interested in it, though it's 32 megabytes zipped (the forum might now allow an attachment that large).
« Last Edit: December 06, 2020, 10:59:44 pm by kcbrown »
 

Offline tautech

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1773 on: December 06, 2020, 10:59:47 pm »
Have you checked Holdoff is set to minimum ?
Frequency ? So we can play along at home.
Screenshot using a Run/Stop so we can also see the waveform.
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Offline bdunham7

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Re: Siglent SDS1104X-E and SDS1204X-E Mixed Signal Oscilloscopes
« Reply #1774 on: December 06, 2020, 11:08:40 pm »
The only way to prevent that from happening is to tell it to reject noise, but in light of the trigger definition, that shouldn't be necessary at all ... unless the triggering mechanism doesn't work the way I think it does.

And hence, my question: how *exactly* does the slope triggering mechanism work, and why would it be triggering on noise in the seeming absence of an initial rising edge that meets the defined criteria?

What is your effective sample rate during your capture?  Can you try changing the acquisition mode to 'PEAK' and see if you can capture any relevant noise that way?
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit DMM is good enough for most people.
 


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