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Old 6th Oct 2020, 4:13 pm   #21
Bazz4CQJ
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Default Re: Adding a Timebase Output to an old Scope

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Originally Posted by David G4EBT View Post
Really, what this little escapade reaffirmed to me to me is what I've known since I was a small child - namely, that I'm more of an artisan than a technician.
This forum is very much a mix of some very talented radio/electronics professionals and people who are "hobbyists", and even among the latter, the range of expertise is diverse. I see myself as "monkey see, monkey attempt to do" in this field. Perhaps that's why I chose to go with building the Armstrong timebase rather than going poking around inside my old scope.

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Old 6th Oct 2020, 4:18 pm   #22
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Default Re: Adding a Timebase Output to an old Scope

When I was but an impoverished teeneager I used 50Hz potted down from a filament supply for both 'scope and wobbulator. You get a bit of a double trace due to the filter delays but the average is spot on unlike a sawtooth drive.
 
Old 7th Oct 2020, 1:27 am   #23
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Default Re: Adding a Timebase Output to an old Scope

The double trace with a sinusoidal scan can be an advantage when sweeping narrow filters. It tells you when to slow the weep down. You can't do that with the mains, but with an audio generator you can.

With this sort of test, play around with sweep speed. Make it faster and watch the picture distort, then slow down watching the distortion reduce. When you get to the point where further slowing makes no further difference to the picture and you're there!

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