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True analog scopes
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TimFox:
Will your DSOs update fast enough to adjust one oscillator to syntonize with another?
tautech:

--- Quote from: TimFox on December 13, 2022, 10:27:47 pm ---Will your DSOs update fast enough to adjust one oscillator to syntonize with another?

--- End quote ---
Hell yeah, that's really basic stuff.

Try it easily with a DSO and a 2ch AWG and watch the frequencies sync as you tune them to equivalent frequencies.
Even old DSO's could do that too before manufacturers started optimizing XY mode.
2N3055:

--- Quote from: TimFox on December 13, 2022, 10:27:47 pm ---Will your DSOs update fast enough to adjust one oscillator to syntonize with another?

--- End quote ---

You can do Lissajous figures just nicely... And when you are synchronizing two frequencies, it gets slower as you come close.
 
vk6zgo:

--- Quote from: 2N3055 on December 13, 2022, 10:17:21 pm ---
--- Quote from: TimFox on December 13, 2022, 09:48:17 pm ---
--- Quote from: 2N3055 on December 13, 2022, 08:56:18 pm ---
--- Quote from: Mechatrommer on December 13, 2022, 07:45:35 pm ---
--- Quote from: 2N3055 on December 13, 2022, 05:52:29 pm ---He specifically wants a comparison between classic analog CRT (direct writing of CRT with analog X/Y beam deflection) and modern real time DSO as a replacement.

--- End quote ---
no. from later explanations, what he want to hear is justifiable excuse why analog is still applicable today. he doesnt care if digital is better, he only want to know why analog is better! so maybe he can scour some tek analog scope with sampling head that are still in ebay while they are still there... btw x-y art is just for kids who have nothing better to do imho, no offense... https://hackaday.com/tag/oscilloscope-art/


--- End quote ---

I said truth, only thing CRT scope does better is X-Y, but difference is only visible with scope art. I have no use for scope art, but i don't judge.
If someone likes it, good for them.

--- End quote ---

X-Y is also good for curve tracing of non-linear devices.
Occasionally, one might need a Lissajous figure display for other than Christmas decoration.

--- End quote ---

All of my scopes will do that just fine... It's really fast dynamic updates (like analog video on CRT scope) that you cannot do or only partially....

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The very early DSOs put off a lot of people who were initially "digital friendly".
When Tektronix & HP went down the DSO "rabbit hole", their reps would roll up to TV Stations to demonstrate the "latest & greatest" DSO.
After they showed us all the "bells & whistles", someone would inevitably say: -

"OK, let's look at some video signals."

The very first generation couldn't even display line rate signals properly, as their sample rate dropped so radically that the higher frequency video components were lost, with the colour burst looking like something you would scribble on a blackboard, rather than the sharp, clear, "RF" envelope.

Field rate?---- Forget it!
The sample rate was so low, that the display looked like my overgrown back yard!

Each generation got ever so slightly better, until the last one I was involved with was actually "sorta" usable, although its sample rate was still low enough to lose the highest frequency BW components & produce an annoying "beat note" with the colour signal.

Later, we had a THS720 (for a special job, because of its insulated inputs), & I used it a few times for fixing Picture Monitors.
It was OK, but not spectacularly good.

One thing I expected with those early DSOs, was to be able to store a "good" waveform & overlay it with the "suspect" waveform from a DUT.
This would have been a "God send" for fault finding, but was probably too costly in memory in those early days.

The Analog video failing seemed to bedevil DSOs for many years, especially the cheap ones, as witness many horrific displays of video waveforms appearing on the Internet.

My understanding was that modern DSOs no longer had any problems, but I don't have a modern, or indeed, any DSO.

One thing that freaks me out with some modern DSOs, is that screenshots from them show a lot of extraneous, distracting information in glaring primary colours.(This is probably a user problem, as I've particularly noticed this where people are looking for suggestions about a problem).
The old ones were much more soothing to my aged eyes!

bdunham7:
XY works fine on many modern DSOs, although it takes a few extra steps to set up properly.

https://youtu.be/9eF5UcLgOpg

What they typically can't do is XYZ (with a few exceptions apparently that I haven't seen) or the Kikusui 'three ring circus'.

https://youtu.be/QUPK-7K6YbY
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