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Flat screen analog oscilloscope .. ?
Flat screen analog oscilloscope .. ?
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Old 6th June 2020, 07:57 PM   #1
hitsware is online now hitsware
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Default Flat screen analog oscilloscope .. ?

...
Such a thing ?
I would like an oscilloscope that works like old fashioned CRT type ,
but with solid state display .
There used to be plans for making an oscilloscope from a T.V.
Is there now an analog circuit that will drive ????? HDMI monitor ?
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Old 6th June 2020, 08:32 PM   #2
PRR is offline PRR  United States
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Flat screen analog oscilloscope .. ?
> works like old fashioned

You mean, with knobs instead of buttons?

Knobs are dying technology. Buttons suck but are real cheap.

If you are a true knob-lover, build a knob-controlled front-end and leave the button-scope at fixed settings.

There are scads of 'scopes for PCs, both sound-card input and dedicated box interface.
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Old 6th June 2020, 08:40 PM   #3
rayma is offline rayma  United States
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Scopes switched over to digital circuitry some time before the displays went to flat panels.
If you really want an analog scope, you'll have to go all the way, and have a CRT in it.
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Old 6th June 2020, 09:09 PM   #4
duncan2 is online now duncan2  United Kingdom
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Correct Rayma my old Tektronix 2445A has a digital display with an analogue tube.


For the record ,I used to own a very old tubed Tektronix that stored data using----yes tube technology it was ,70,s era type 564
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Old 6th June 2020, 10:15 PM   #5
hitsware is online now hitsware
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> You mean, with knobs instead of buttons?

No .... I mean locks onto and displays the signal real time ...
No storage ..... Probably no characters ....
Actually it would be essentially a ( say ) 8 bit x 8 bit matrix
analog ramp generator driving columns and signal driving
rows ..... concept so simple but I can't figure out how to
interface the analog to say ( best case ) a hdmi
( or even composite would be O.K. ) monitor .
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Old 6th June 2020, 10:31 PM   #6
phofman is offline phofman  Czech Republic
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Analog scope deflects the electron beam in one direction by the time base, in the other direction by the measured signal. While a standard display device supports only several timing modes. For aligning the two time domains you would need... the storage, to allow displaying in a different rate than capturing.
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Old 6th June 2020, 10:51 PM   #7
FauxFrench is offline FauxFrench  France
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Quote:
Originally Posted by hitsware View Post
...
Such a thing ?
I would like an oscilloscope that works like old fashioned CRT type ,
but with solid state display .
There used to be plans for making an oscilloscope from a T.V.
Is there now an analog circuit that will drive ????? HDMI monitor ?

Such a thing ? Basically no. The idea behind the old CRT scopes was different - make a continuous scan from left to right with the bandwidth of the scope. An advantage was that you could see any deformation of the curve the noise-level and bandwidth would allow. It reflected the technology available during that period. The disadvantages were many - among other storage was difficult. An LCD or similar screen made up of numerically controlled pixels cannot behave like a CRT - it can emulate a CRT-scope with some limitations.
The sampled scope has few limitations that mainly relate to the speed and resolution of the sampling. It will improve with time and apart from multiple colors on the screen, data can be manipulated and presented in endless ways. The sampled scope will increasingly be able to behave like a CRT-scope on top of the sampled scope advantages.

Last edited by FauxFrench; 6th June 2020 at 10:55 PM.
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Old 6th June 2020, 10:56 PM   #8
hitsware is online now hitsware
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Quote:
Originally Posted by phofman View Post
Analog scope deflects the electron beam in one direction by the time base, in the other direction by the measured signal. While a standard display device supports only several timing modes. For aligning the two time domains you would need... the storage, to allow displaying in a different rate than capturing.
Say you have a led matrix
Columns are driven one at a time by a ramp into a flash ADC then through
a parallel to 255 step generator
Rows driven one at a time by measured signal into flash ADC then through
a parallel to 255 step generator
The signal would not lock without adjustment , but it should act like a CRT ...
one pixel at a time fired ..
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Old 6th June 2020, 10:59 PM   #9
FauxFrench is offline FauxFrench  France
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Hi hitsware,
Your idea is emulating a CRT-scope but it will not be a CRT-scope.
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Old 6th June 2020, 11:07 PM   #10
phofman is offline phofman  Czech Republic
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Yes, you can build a dedicated flat panel instead of the CRT. But you asked about HDMI or composite signal, using regular TV. These support only one or very few frequency modes.

Another issue is speed - electrostatic deflection in the scope CRTs is pretty fast, luminiscent layer on the screen lights up pretty fast too, unlike digital display drivers.

When you already have the data sampled by ADC, why would you need to display them in real-time?
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