Electronics > Beginners
Modern oscilloscope views: YT, XY but where is XYZ ?
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timb:

--- Quote from: eKretz on June 01, 2017, 10:43:14 pm ---
--- Quote from: Ivan7enych on May 31, 2017, 05:39:58 pm ---
--- Quote from: w2aew on May 31, 2017, 03:52:00 pm ---The current Tek DPO5000, 7000 and 70000 series scopes all have XYZ mode, although these are performance scopes geared towards the professionals.  Even the older TDS3000 series has XYZ. 

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Thank you!
I have older Tek TDS744A (with InstaVu, not DPO) - it doesn't have it. Also my new Agilent 3014A doesn't have it, in XY mode channels 3 and 4 are disabled.

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If you had a later TDS 'D' model you'd have XYZ mode. To wit, my TDS754D:



My TDS754A doesn't have XYZ mode either. They added it to the later models, not sure which alphabetical variant was the first to get it. Tek's "InstaVu" and "DPO" are basically the same thing except the latter has some better added features and is snappier.  Oh, and BTW, XYZ is only available to be selected in the menu if the scope is in DPO mode.

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I just checked on my TDS754C and the RO menu disappears when in InstaVu mode. Shame, as that would have been cool to have.

Though it's been my experience XY/XYZ modes suck on pretty much all digital scopes, especially on older models like the TDSxxx series. For one thing it's almost always a "Triggered XY" mode, which is *not* the same thing as a classic analog scope's XY mode (which is untriggered). You also have to set the timebase pretty low to get the sampling rate up (to increase the fidelity of whatever vectors you're trying to draw), the problem with that is then you *really* need the scope to have a large sample memory. That generally makes older scopes pretty laggy and significantly slows down screen refresh. Newer scopes still aren't that much better in terms of XY modes.
mikeselectricstuff:
XYZ as a 3D plot would be interesting. Also a waterfall X/Z plot to show delays over time.
metrologist:
I just remembered this video

stj:
this raises an interesting question,
how useable is XY mode on modern DSO's?
is the screen update rate good enough, or do moving images just skip about?
w2aew:

--- Quote from: stj on June 02, 2017, 02:04:44 pm ---this raises an interesting question,
how useable is XY mode on modern DSO's?
is the screen update rate good enough, or do moving images just skip about?

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For the modern DSOs that I've used in XY and XYZ mode - I'd call it "acceptable", but certainly doesn't match the truly live/smooth result that comes naturally from an analog scope.  The DSO can render a shape/trace for very slowing changing inputs that would show up as a moving dot on an analog scope, so in that corner case the DSO is better than a CRT.  But, for most live, dynamically changing inputs, the CRT is better.  Newer DSOs are getting better at this...
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