Electronics > Beginners

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

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Ivan7enych:
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.

Brumby:
I have an old Hitachi V-152B with that.

It was an easy way to add a third channel of information - albeit of a very limited nature.  In my experience, the practical opportunities for it to be useful were extremely infrequent and for those moments when you wanted more than two channels - it was somewhat inadequate.

This is using a scope as a scope - not a TV.

These days, with the price of modern scopes starting so low, you can get a 4 channel unit and get full detail on not only a 3rd, but a 4th channel as well.

IMO, the Z-input has little value in any scope.  I know I don't even look for it on scope spec sheets.

macboy:

--- 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.   ;)

Brumby:
Yes.... well......

w2aew:
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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