Electronics > Beginners

Modern oscilloscope views: YT, XY but where is XYZ ?

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timb:
There are also some use cases where you can hook the gate signals from a standalone frequency counter up to the Z input of a scope, in order to visually see where on a waveform it's actually counting, where the trigger happens, etc. (That portion of the waveform will be intensified, like using the A-Inten mode of a scope to intensify the portion of A-Sweep that's being shown in the B-Sweep.)

There was an HP app note or article about this, but I can't seem to find it at the moment.

Ash:
I have a Rhode & Schwarz HMO3004 that is a 4 channel, or 3 channel + 8 logic, or 2 channel + 16 logic scope. It has XY, XYY (2 Ys against the same X), and XYZ / XYYZ modes.

I've not used them in anger yet, but I have a function generator (HP3314A) that includes a blanking output that is designed to drive a Z channel. This is designed so you can sweep a frequency span and display it nicely on a scope for measuring frequency responses. The X-drive ramp output is related to frequency and the Y axis is the DUT output. Then you use the blanking Z output to both blank the display during the "retrace" as the sweep resets, and also to intensify certain sections of the sweep as frequency markers.

Bit like this (although he doesn't seem to have a Z axis on the generator he is using.. and I can't quickly find an real exampe.. might have to make one some day and upload it):



Ash.

basinstreetdesign:

--- Quote from: macboy on May 31, 2017, 03:18:40 pm ---
--- Quote from: Brumby on May 31, 2017, 03:11:34 pm ---...IMO, the Z-input has little value in any scope.  I know I don't even look for it on scope spec sheets.

--- End quote ---
The people over in this thread will disagree.   ;)

--- End quote ---

I also used it some years ago when I was building a vector-scanned laser display system.  A possibly high power laser beam would be moved around by means of programmable mirrors and could be turned on and off with a solenoid-driven gate.  In testing the system I would connect X and Y laser channels to the scope in X-Y mode and the solenoid to the Z- input to get a usable rendition of the final image on screen.

eKretz:

--- 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. 

--- End quote ---
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.

--- End quote ---

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.

jwm_:
I have really wanted that too on various occasions. With a modern scope it would ok do be great if it could control color rather than intensity as an option, when using my octopus curve tracer I was thinking it would be super nice to plug the base voltage into the z axis and see each curve in its own color.

I have wondered whether a little breadboardable display that did nothing but be an intensity graded xyz display with analog inputs would be useful.

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