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Blanking the retrace - Analog scope

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atferrari

Well-Known Member
I managed to show on my scope a symbol formed by several dots by controlling voltages at the X-Y axis.

To make it neat I would need to blank the retrace between dots.

My scope is an old analog TRIO 10 MHz CS1562A. Couldn't find the manual but a PDF version found in the Web says that "modulation" may be done "at TTL" levels.

Just in case, I tried myself bringing the Z axis input to 0V and 5V, getting only a change in brightness.

Is it any way I could blank completely the retrace in between spots?
 
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Nigel Goodwin

Super Moderator
Most Helpful Member
I suggest you consult the circuit, and see if applying more voltage will blank it further - but it may be as far as it's supposed to change. Z inputs I've looked at in the past require LARGE voltage changes, as the essentially drive the cathode (or grid) pretty well directly.
 

atferrari

Well-Known Member
Thanks Nigel

You were online, I can see. Thanks for replying,Nigel.

I am affraid of trying any different from the manual because of that of "TTL levels". It is the only scope I have and no money to replace it in the near future...

Would you say that it could be safe to try any different?
 

atferrari

Well-Known Member
Z axis input

There are several transistors between the Z input and the grid in question.
I presume, it precludes applying any high voltage to it.
 

crutschow

Well-Known Member
Most Helpful Member
Try reducing the trace intensity. You may find a point where the beam is blanked but still retains sufficient intensity to see the dots.
 

atferrari

Well-Known Member
Problem solved

Problem solved: applying -5V to the input did the trick. :)

Gracias to you both for replying.
 
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