Products > Test Equipment
Oscilloscope Zoom Out Quirk
nctnico:
--- Quote from: 2N3055 on March 06, 2021, 08:28:20 pm ---
--- Quote from: rsjsouza on March 06, 2021, 12:33:28 pm ---
Sinisa, that is where you lose me. No question about the benefits or characteristics of the Auto setting, but another is the fact that in a Rigol I can set a memory depth and the oscilloscope will obey my command. That is not what is seen in Dave's video: Siglent will size it according to what it thinks it is better.
And no, I don't need to do "mental math and paying attention that they all sit together" either.
Otherwise, I have been in lenghty interface and ease-of-use discussions to know these things are hard to convince if there is not a very clear benefit one way or another.
--- End quote ---
About mental math, that is maybe debatable. Why? Because, when you set 14 Mpts memory depth, how long SPI (or any other event) sequence can you get with it ? And by long I mean how much time you get in total? 10 ms, 20 ms, 330 ms ?
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It doesn't matter as long as it is enough. It is like the gas gauge in a car you have driven for a decent amount of time. If it points at 'half full' you know how far you can get (and need to refuel for the trip ahead or not) because you are familiar with the car. Not everything needs to be quantified to 10 digits after the decimal point to in order to be accurate enough, usefull and/or true. How much gas is there in the car? 'Enough' is sufficient to know.
--- Quote ---Problem is that, after hundreds of messages, I managed to make Nico say what is his main use for it. What he said it was capturing long data on serial buses, while looking at very short part of that capture that has some event or packet of interest. He keeps scope in RUN mode (not Single), and if he sees the event (error, or whatever is of interest) he manually stops the scope (events are sparse, so there is time to react) and then can move inspect whole capture for details. Captures are quite long, on order of 0,1 -2 seconds, done on low sample rates.
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Now you are mixing up several scenarios I outlined.
SilverSolder:
The zoom out thing is obviously useful in some scenarios, where you have both "trees" and "forests" going on, and you are switching between the two perspectives.
How did this end up being so hotly debated? - got to love the Internet! :D
Someone:
--- Quote from: SilverSolder on March 06, 2021, 10:38:47 pm ---How did this end up being so hotly debated?
--- End quote ---
Its not hotly debated, like has happened on other topics a minority (or single person) keeps reposting misleading information for some unknown reason. They can't fully justify or support their claims but keep coming back for more ridicule.
It'd be great if scopes offered the choice to set all these parameters, but absolutely none do. Its that all the different scopes have different ways to achieve the same thing, and their tradeoffs are different. What you like I might hate, which is fine. But I don't go out of my way to insist everyone else should like what I do, and all scopes should change their way of working to match my ideas. I also don't bomb every thread even slightly related to shout about how particular brands work in ways I don't prefer, blowing up tiny issues that no-one asked about.
The fun thing is there has been a manufacturer who radically changed their operation mode: Tek. Auto vs non auto, which is most popular? which causes more support requests?
SilverSolder:
--- Quote from: Someone on March 06, 2021, 10:51:01 pm ---[...]
The fun thing is there has been a manufacturer who radically changed their operation mode: Tek. Auto vs non auto, which is most popular? which causes more support requests?
--- End quote ---
Is there anything quite as disheartening as staring at an oscilloscope screen that refuses to display any trace? :D
Martin72:
An elder Note from Lecroy about the advantage of long memory:
http://cdn.teledynelecroy.com/files/appnotes/lecroy_long_memory_in_digital_scopes_appnote010.pdf
The uploaded pic shows a part of the rigol ds1000z user manual...
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