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Why is the trigger rate of my scope (SDS814X HD) changing in an unexpected way?
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eTobey:
Since no one can explicity answer my questions, i just add some links here, that might help others that come here. The following posts were of no help. At least for me that wants to know things more specific.

https://www.tek.com/en/blog/sample-processing-digital-oscilloscope







Original post:
2N3055 demanded that i post this in the bug topic, but i believe there will be a lot of people who would not like that either, so i make a new topic:

Yes, i know, that not every edge can be triggered on, and the rate at which it happens will vary depending on a few things. But the behaviour i observed still seems quite strange to me. (Yes i am again advancing into the world of low sample rates  ::) )

Said in a nutshell, it should be slower with more data to process, and vise versa. But it is not!

Its a 90 Hz signal.

https://youtube.com/shorts/XvDNO43fBtk

Discovered seemingly the same issue with seg aqcuire mode: https://youtu.be/J5-ZZc376wQ

Trying to capture every edge for a certain amount of time seems to be quite a task to manage.

Edit:
Made another Measurement:

- timebase 10us
- signal 90Hz square
- 200kSa/s
- segment mode
- trigger: edge rising / no holdoff / trace is filling the screen, trigger level OK
- Vector mode
- no measure or search activated

First test 3 channels on:
For 1000 segments it takes about 11s (measured with stopwatch)
Trigger output triggers about every 10-11ms

Second test only one channel on:
For 1000 segments it takes about 22s (measured with stopwatch)
Trigger output triggers about every 22ms

2N3055:
OMG....

Not another one separate topic!!
 
Put it in common SDS800 bugs topic...
There people will look into it and we'll see if it is a bug.
eTobey:

--- Quote from: 2N3055 on September 29, 2024, 01:39:56 pm ---OMG....

Not another one separate topic!!
 
Put it in common SDS800 bugs topic...
There people will look into it and we'll see if it is a bug.

--- End quote ---


--- Quote from: Furna on September 28, 2024, 09:55:56 am ---Not only ... I would like this thread to be used for 2 reasons only:
- when a bug is found, reproducible and documented
- when a new firmware is released
This would allow me to subscribe to the thread and use it as an "alarm" that time to upgrade firmware arrived.
There are other threads for open discussions, opinions ...
Indeed it seems this person just start typing randomly in different threads or even opening a new one.
Frankly speaking a veri annoying behaviour.

--- End quote ---

Underneath that post: "The following users thanked this post: Performa01, newbrain, 2N3055, KungFuJosh, Martin72, mawyatt, jasonquin".

I dont think its a bug, i just want to understand why that is, and how to predict this behaviour.

tautech:

--- Quote ---Why is the trigger rate of my scope (SDS814X HD) changing in an unexpected way?
--- End quote ---
FTFY

To optimise over all performance at every timebase setting.
Fun learning about this stuff isn't it ?
gamalot:
I don't understand, you set the time base to 10us/div and the sampling rate to 200kSa/s, why?
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