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Phase scope
Phase scope
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Old 13th February 2018, 05:33 AM   #1
argonrepublic is offline argonrepublic  Canada
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Default Phase scope

I recently aquired a Vectorscope that also works as a Phase scope. I do not have any training or experience on this type of analyzer but I use a software Phase scope with some of my projects and find it to be very useful.

I would really like to learn how to connect this real analog Phase scope.
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Old 13th February 2018, 10:49 AM   #2
mpeg2 is offline mpeg2  United States
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Not familiar with this type of particular device, but I'd suspect a typo in the diagram. Phase/vector scopes are typical X/Y devices (one channel drives vertical (Y), the other horizontal (X)) - however in the diagram, I only see "Y". The text below alludes to "X"...
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Old 14th February 2018, 12:27 AM   #3
Refugee1 is offline Refugee1  United Kingdom
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Could it be a TV decoder tool?
The X would be the line scan or refresh.
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Old 14th February 2018, 01:50 AM   #4
argonrepublic is offline argonrepublic  Canada
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Yes it is designed for TV but the manual has a small section on its use as an audio phase scope
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Old 15th February 2018, 01:11 AM   #5
Refugee1 is offline Refugee1  United Kingdom
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The ones I have seen in the past had internal decoding.
I have never installed one so have not read up much on them.
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Old 15th February 2018, 08:38 AM   #6
stratus46 is offline stratus46  United States
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Quote:
Originally Posted by argonrepublic View Post
I recently aquired a Vectorscope that also works as a Phase scope. I do not have any training or experience on this type of analyzer but I use a software Phase scope with some of my projects and find it to be very useful.

I would really like to learn how to connect this real analog Phase scope.
Looks like a Tek 1720. We've used them as audio phase scopes and they work fine. The inputs can be run balanced or unbalanced. They give you high gain XY inputs for lower signal level consumer units. Those scopes have some nasty Voltages internally so be careful but the signal inputs are hard to damage. If you're using a digitally sourced analog source just make a 0dB FS signal (max level without clipping) and set the gains to stay on the screen. Going off the screen (too much gain) won't hurt anything, just reduce the usefulness of the display.

G
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Old 16th February 2018, 05:12 AM   #7
PRR is offline PRR  United States
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I agree the manual may have a typo. A similar diagram in a similar model has other marks.

Or work it out from the schematic.
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