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True analog scopes

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Mechatrommer:

--- Quote from: mag_therm on December 13, 2022, 03:01:51 pm ---Bumping that default button is a mild disaster, needing another pecking session.

--- End quote ---
if it only give bad things to you, just peel the rubber button off so there is no more disaster..

mag_therm:
Just tried, thanks. It did not come off with some force, so I'm scared of breaking it.
Scope is still in warranty, Maybe I will wait until warranty is over.
I had though of making a little flap or milling aluminum surround guard to glue on but there is very little space around the button

mawyatt:
We've been using "analog" scopes for well over 60 years, got our 1st analog scope (Heathkit) when 12, and utilized just about every Tektronix analog scope ever made. Even did custom plug-ins if any folks remember those from Tek, they were the metal case plug-in and blank front panel with a prototype PCB inside and interface connector. Had many "custom plug-in functions" for the various Mainframe Type Tek analog scopes we utilized.

From an old (very old) analog diehard it took some time to "pull the trigger" on a modern DSO for ourself, having the old "analog" bias prevented this for awhile!!

Now after some time using such, comparing an analog scope to a modern low noise, high resolution DSO is like comparing a Simpson 260 to a Keysight 34465A or Keithley DMM6500. We keep a couple Tek 2465s around just to remind us of how good these newer DSO are, and to play around with just as reminders of days of old ::)

Best,

2N3055:

--- Quote from: Sherlock Holmes on December 13, 2022, 02:56:52 pm ---
Well yes, an analog scope as you know, cannot have quantization noise. But my scope has an 8 bit vertical resolution, that's 256 resolution yet the display has a vertical pixel resolution of 480. There are quantization effects that are undoubtedly present, my question was to anyone, especially professional engineers, whether there are ever cases, domains, situations where an analog scope (perhaps one of the more recent analog high end scopes) is advantageous.

There may well be no such situations at all, ever, but I don't know so wanted to see if any experts here could point out examples.

--- End quote ---

And what do you thing CRT scope has no noise? How thick is the trace? There is a limit on "analog resolution", it is called noise floor.
It is same as "megapixel wars" in SLR cameras, where saying "film is analog" doesn't mean it has unlimited resolution. It doesn't, it has grain. And "analog resolution" (sharpness) of lenses is also a thing...

Decent DSO of today will have less noise (despite 8 bits) than most CRT scopes with exception of few special ones.
And higher bit (10bit and up) will have more detail than any analog CRT scope.
And FFT, math, measurements, analysis, mask test, single shot capture, decodes... And huge screens in comparisons. Networking, remote control, easy saving of data and screenshots...

There is only one thing where CRT is still better : X-Y mode for scope art.. And as someone here mentioned, some of the fancy CRT modular scopes had some special modules that have no equivalent, but that is not a analog/digital difference.
Those a niche enough there is no imperative for manufacturers to invest into developing that anmore. If there was need for it, it would be made.

Sherlock Holmes:

--- Quote from: 2N3055 on December 13, 2022, 03:48:30 pm ---
--- Quote from: Sherlock Holmes on December 13, 2022, 02:56:52 pm ---
Well yes, an analog scope as you know, cannot have quantization noise. But my scope has an 8 bit vertical resolution, that's 256 resolution yet the display has a vertical pixel resolution of 480. There are quantization effects that are undoubtedly present, my question was to anyone, especially professional engineers, whether there are ever cases, domains, situations where an analog scope (perhaps one of the more recent analog high end scopes) is advantageous.

There may well be no such situations at all, ever, but I don't know so wanted to see if any experts here could point out examples.

--- End quote ---

And what do you thing CRT scope has no noise? How thick is the trace? There is a limit on "analog resolution", it is called noise floor.
It is same as "megapixel wars" in SLR cameras, where saying "film is analog" doesn't mean it has unlimited resolution. It doesn't, it has grain. And "analog resolution" (sharpness) of lenses is also a thing...

Decent DSO of today will have less noise (despite 8 bits) than most CRT scopes with exception of few special ones.
And higher bit (10bit and up) will have more detail than any analog CRT scope.
And FFT, math, measurements, analysis, mask test, single shot capture, decodes... And huge screens in comparisons. Networking, remote control, easy saving of data and screenshots...

There is only one thing where CRT is still better : X-Y mode for scope art.. And as someone here mentioned, some of the fancy CRT modular scopes had some special modules that have no equivalent, but that is not a analog/digital difference.
Those a niche enough there is no imperative for manufacturers to invest into developing that anmore. If there was need for it, it would be made.

--- End quote ---

I don't disagree, my OP was intended to find out if there were any specialized industries or situations in which an analog scope was preferred. For example, what was the highest ever bandwidth CRT scope? was it a higher frequency than the highest bandwidth DSO today?





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