With Siglent, you would have to set slower timebase, capture again and zoom in - more steps and effort (not much, but still).
How many times does this need to be repeated?
Full quote:
Is zoom out useful? Definitely, it allows quicker understanding of signal behavior at fast time base (main focus) and at slower time base without re-capturing again. With Siglent scopes (models having no fixed memory setting), you would have to set slower timebase, capture again and zoom in - more steps and effort (not much, but still).
How many times context of posts will be selectively ignored to discredit zoom out capability?
You do not have to use that workflow, if you wish to navigate around a larger window then capture it in the first place using zoom (or whatever method you prefer). When stopped all the data is there and there is no need to recapture as you claim.
Yeah, no need to recapture because you ignored first capture which was deemed too short/fast for some reason (how did you arrive to such conclusion without capturing, anyway?) and then recaptured on purposely slower time base. Oh, wait
Keysight can capture at fast timebase AND gets more memory (aka "zoom out") AND can do whatever analysis with this capture. OR it can capture at slower timebase and do whatever.
Siglent scopes (models having no fixed memory setting) can capture at fast timebase AND gets less memory thus FORCING you to recapture again in slower timebase if fast timebase capture memory if insufficient for analysis. Only after recapturing at slower timebase (which now gives adequate memory) you are free to do whatever.
Keysight memory management is more flexible at fast timebases (while having no downsides) compared to Siglent. On Siglent scopes (models having no fixed memory setting) you get less memory at fast timebases. On Siglent scopes (models having fixed memory setting) you get same or more memory at fast timebases, but at slower update rate.
Keysight scope gives more capture memory at fast timebases or is faster in RUN mode, obvious advantage. This fact does not change if some users do not appreciate/choose to ignore it.
Let's say you are in hypothetical T&M cafe drinking coffee. Waiter asks if you want anything else and you say: "
Can I have a biscuit, please?"
If T&M cafe is run by Siglent (considering no fixed memory setting scope like SDS800HD), waiter responds: "
Biscuit is not available to customers who have ordered coffee already. However, we will make biscuit if you order it with an additional coffee."
If T&M cafe is run by Keysight, waiter responds: "
I will check if biscuit is available and get it for you. If not, we will make biscuit if you order it with an additional coffee."
Which cafe provides better service?
In this analogy exchange coffee to single capture and biscuit to memory beyond display limits and you will get the gist.
EDIT: added clarification on Siglent models as they differ in memory management.