I do know what's the difference between AC/DC means. And I still prefer trigger level to be displayed at all times (it's like you can measure min/max values of waveform regardless of channel coupling) with coupling indicator on the marker itself. Just because you don't like this approach does not mean people who don't share the same views are idiots who don't know how the scope works.
And -- when both the channel and the trigger are AC coupled, that trigger marker *is* meaningful.
As a sidenote, I can't think of the last time I used AC trigger coupling on my scope. I don't seem to ever encounter a situation where I want to keep the DC/LF component on the waveform yet trigger on the HF signal; I seem to always be perfectly happy just AC-coupling the channel, and I get to keep my nice trigger line on the screen at all times too. I wonder if some people (to be clear, not specifically suggesting present company) leap too quickly to using the AC trigger mode, perhaps without considering the channel AC coupling mode?
On the SDS 1202X-E if you do an FFT with the Center frequency set to 0.0000Hz, it actually displays 0.0Hz in the center of the display, wasting about halve the display width since there is no content below 0Hz.
It would seem to make much more sense to auto-size this to use the full display width, ie. with 0Hz being all the way to the left.
Am I missing something here? How does this work on other scopes?
In continuation of the topic of some slowing down of reaction 1202x-e:
1. I noticed that some signs of "retardation" arise after I write a few long fragments into memory - and I scan them. Maybe they are not completely unloaded from memory - I do not know. But after several such operations, "thoughtfulness" appears already simply when viewing the sine of 50 Hz.
2. Resetting to the default settings of course helped restore the reaction speed. But the fact is that I did not install any "difficult" settings before that, since I work with the most standard functions and settings.
3. When will the new firmware be released?
On the SDS 1202X-E if you do an FFT with the Center frequency set to 0.0000Hz, it actually displays 0.0Hz in the center of the display, wasting about halve the display width since there is no content below 0Hz.
It would seem to make much more sense to auto-size this to use the full display width, ie. with 0Hz being all the way to the left.
Am I missing something here? How does this work on other scopes?Yes, but where would you stop the center frequency setting ? 10, 50 100, 1000 Hz ?
It is not an issue for normal FFT usage.
The new firmware has resolved most issues that I'm aware of.
http://www.siglentamerica.com/USA_website_2014/Firmware&Software/SDS1000X-E_5.1.3.13.zip
When was that released? I cheked very recently, but not on the siglentamerica.com domain.
The new firmware has resolved most issues that I'm aware of.
...
Please report any further issues seen.
Is there any planned SDS2000X firmware update in the works?
I suspect there is now some "trap" outside of oscilloscope.
Please, can you do this next steps first.
Set exactly same signal to input what was in previous images.
I have tested inputs, with various signals, using different signal generators and signals including also Tektronix CG5011 scope calibrator and I can not see any weird things like you show. Not with previous FW and not with this new.
Set Scope speed 100us/div (1GSa/s 1.4M)
Acquisition Normal
Set display persistence 5 seconds
Display mode Vectors and ColorGrade ON ( for better visibility)
Set input coupling DC and offset 0
Set Trigger coupling AC and level 0
Let scope run least over 5s without touching anything but then print button
Take screen image what ever it show to USB stick using print button when scope is RUN (do NOT stop scope)
Let scope run and keep all, including signal, exactly same, only change input coupling to AC and do not touch anything else and let scope run without touchibg anything least over 5s and then
Take screen image what ever it show to USB stick using print button when scope is RUN (do NOT stop scope)
Show these images.
Next questions. What is your signal parameters, as exactly as possible.
Do you have good signal generator available for some next tests and what signal quality is enough well known and also coax cable for connect it to scope. But first I hope to see these two images before go forward..
Now it is "repaired". Need one cup of coffee and one wooden (bamboo) chopstic.
Now it is "repaired". Need one cup of coffee and one wooden (bamboo) chopstic.
You disturbed self cal by pouring coffee over the scope?!
And I don't want to think about where you might have poked the chopstick...
This guy seems to think AC trigger coupling is a good thing:
Could it be sng61 has not run the Auto Cal as instructed after installing the FW update ?
There's a later version of the Programming Guide here:
http://siglentamerica.com/support_download_28
I don't know (haven't checked) if there's more info in it to help you solve your issues.
This guy seems to think AC trigger coupling is a good thing:
And how often is the average designer encountering systems with signals at 4 different voltage offsets? Not me, being the digital types most of the signals I've looked at over the past year have been 3V3 and 5V digital stuff, and not a lot of other people I suspect.
I will cut myself off here, but I think this video would look very different if it were done by someone born and raised with modern digital scopes, rather than insisting to a fault that analog scopes are the gold standard of ideal behaviour.
QuoteI will cut myself off here, but I think this video would look very different if it were done by someone born and raised with modern digital scopes, rather than insisting to a fault that analog scopes are the gold standard of ideal behaviour.They largely are, though, if you want the best representation of the signal.
And how does insisting that the trigger signal is drawn off before the channel coupling, purely based on the arbitrary imposition that that's how analog scopes work, help in providing the "best representation of the signal"? I'd see where you were coming from if we were talking about the picture on the screen, but we're talking about the triggering circuit diagram here.
Checking this: my understanding wasn't correct. The triggering can still be performed in analogue terms, by taking the signal after the initial input gain (analogue). So the triggering selected may involve the sampled data, or it may not.
Presumably this is required if you want DC triggering on an AC coupled waveform.
If this wasn't done, then you would have to base the triggering on the sample data and so would not be able to implement a DC trigger level on AC coupled data (as you wouldn't know what the DC offset of the signal was). Unless there is some other process here that I am unaware of.