EEVblog #1311 - Can Your Oscilloscope Zoom OUT?

Zooming in is easy, but can your oscilloscope zoom OUT?
A look at the results of differences in scope acquisition architecture, and fixed vs auto memory depth.
And what's the difference between the STOP button and the SINGLE button?

#Oscilloscope #Tutorial #Quirk

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[septicsounds]

18:10 how do 10 ms at 10 GS/s equal 20Mpts? 10 x 10e-3 x 10 x 10e9 = 10e8 = 100M

[StaticSkyTV]

Sweet kit. If I ever have a spare US$14, 271 maybe I will pick one up.

[fou_barre]

My rigol DS1054Z does this. I set mem depth at 6M pts, and it will capture those many points, even if stop at 5ns per division. and it is a budget one.. Just zoom out.and you have about 20ms of data with three channels on, so that i do not loose SPI data.

[jon_collins]

The Siglent does it that way because the 'history' mode is always recording history into the spare memory.

[AnalogueGround]

Great video - hadn't given this much thought before and now it has to be a must have feature in a 'scope.

[PlasmaHH]

Having the ds1054z I was thinking the other way round, thought that every scope can do that...

[FolixOrision]

Thumbnail looks like a fusion reactor. *thumbs up earned before even watching the video*

[sanches]

when I was working for a large automotive company i was so spoiled that this was the minimum i'd work on :) now i have a company of my own and this is the maximum i can afford currently :)

[innopriest]

Good video. All my scopes work how you'd expect, full memory capture when setting for full memory.

[dsfryda]

Hey it actually works on the Rigol 1054Z (hacked to the 1104Z) when you change the memory depth from auto to 24M

[KirysIt]

I've just thought that feature as granted cause my cheap and old rigol ds1054z has some "zoom-out" features in single mode, if you set a memory depth it always fill out the memory with the current sample rate (that is a function of the zoom level) so depending on the sampling rate you have some extra data for zooming out and explore the waveform.

[frosty]

My owon vds1022i usb scope can’t even zoom period. Tough.

[tullgutten]

The "Run stop " is very similar to professional slow motion cameras that films slow motion footage in the RAM constantly overwriting it and when you push the trigger button and its set to capture before and after trigger the remaining slow mo footage is then stored to the rest of the RAM

But here you stop it instantly at already saved data

It is faster to write data to RAM than deleting and then writing to it, so it is a better/cheaper way of getting good results 👍

[pmgodfrey]

Engineers: I wish I could measure things before they happen.
Keysight: What if there's something that you don't know, that you don't know.

[Gameboygenius]

7:08 Hey, what's going on there? Why is it displaying 3 "traces" at once? Only one of them can be realtime, correct?

[aksting]

For the Siglent, this is like buying a 1000mL drink and only getting 100mL and being told you will have to come back for the remainder 900mL in increments of 100mL.

I want it all and I want it now!

[wsowa]

Dave, I think you’re missing one point on how the Siglent utilise its spare memory. Not sure about other manufacturers but with siglent if you limit the memory depth you gain longer history. So if you set low memory depth then in normal mode you will have access to the history of triggered captures each spanning a screen at current time division (but nothing before or after it as you're pointing out). The number of frames that fits the history depends on set memory depth. This is quite a useful feature. Not sure if other manufacturers offer an equivalent. That said I agree that in the single capture mode there's no history so ideally the scope could utilize the memory for capturing the signal before/after the screen frame.

[movaxh]

The difference between run/stop and single is expected. It can be improved sometimes but there are technical reasons for it, especially on so fast trigger rate scope. In single it will usually capture whole memory buffer symmetrically on both sides. In Run/stop it will depend on trigger rate and some other factors.
But the behavior of Siglent is definitively a bug, or a serious design flaw. Hopefully they fix it. It would drive me nuts.

[ovalwingnut]

Like a SR71, was a bit over my head. But I liked it just the same. No pain no gain.

BIG 👍 UP

[AllElectronicsChannel]

someone even can blame keysight for changing memory depth "on the go" to improve display speed and wave capture rate but nothing is more annoying than the Tek MSO manual memory depth setup