Electronics > Beginners
Modern oscilloscope views: YT, XY but where is XYZ ?
free_electron:
--- Quote from: Ivan7enych on May 31, 2017, 02:58:58 pm ---Hello to all,
Stupid question, years ago I had an old analog oscilloscope, it had not only 2 usual modes "Y versus Time" and "Y versus X", but also had Z input, where I can put any signal to change electron beam intensity and thus vary trace brightness.
As a result I could for example make an simple analog TV from oscilloscope, putting AV signal to Z input and horizontal + vertical raster signals to usual 2 X Y channels.
Nowadays I see no modern 4 channel oscilloscope with this feature. :-// Oscilloscope makers could for example make a feature, to put 1 and 2 channel to X and Y, then 3rd channel to brightness, (and 4th channel to color of the trace). May be there's no practical engineering application, but this could be a big fun to play with.
--- End quote ---
Z modulation would require another sampler running at the same time storing an 'intensity byte' per sample. you just doubled your memory requirements and probably did a lot worse when it comes to the processing required for visualisation.
These kind of shenanigans are useless for real applications. if you need this kind of stuff : sample Z with one of the channels ,dump the trace data and send it though some software on the computer.
mikeselectricstuff:
--- Quote from: free_electron on October 25, 2019, 02:53:33 pm ---
Z modulation would require another sampler running at the same time storing an 'intensity byte' per sample. you just doubled your memory requirements and probably did a lot worse when it comes to the processing required for visualisation.
--- End quote ---
But a 4-channel scope will already have this.
I suspect Z-mod inputs were common in the analogue days simply because theye were very easy to implement. Can't say I've ever found a use for it, though it does allow for some fun playing around
atmfjstc:
This gets me thinking... if all you have is a XY display, and you're satisfied with isometric instead of true 3D, one could rig up a resistor network to the inputs to project XYZ to XY. The equations are linear, something like:
X' = aX -bY
Y' = aX +bY + cZ
(I forget the exact coefficients)
Ivan7enych:
--- Quote from: free_electron on October 25, 2019, 02:53:33 pm ---These kind of shenanigans are useless for real applications. if you need this kind of stuff : sample Z with one of the channels ,dump the trace data and send it though some software on the computer.
--- End quote ---
Here is an example of real application.
First picture -
X Y - current probes on stepper motor coils
On second picture I put step pulse from controller to Z input
This highlights each microstep and hides all transitions.
artag:
--- Quote from: free_electron on October 25, 2019, 02:53:33 pm --- your memory requirements and probably did a lot worse when it comes to the processing required for visualisation.
These kind of shenanigans are useless for real applications. if you need this kind of stuff : sample Z with one of the channels ,dump the trace data and send it though some software on the computer.
--- End quote ---
Fine for static data - Matlab and many other plotting libraries are commonly used for this sort of visualisation. But it's much rarer to do live visualisation in plotting software. The nearest thing to a common computer-based live display is probably chart recorder emulation, though I think I've seen something more like a 3D plot in audio analysis.
It emphasises once again that test equipment shouldn't be closed, single-task stuff. It should be acquisition hardware with a user-programmable UI.
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