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True analog scopes
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Fungus:

--- Quote from: adam4521 on December 20, 2022, 09:17:51 pm ---But now at fast (but not exceptional) timebase of 20ns/div — get your calculator out to check me — the same beam is tracking horizontally at 500000 m/s, a horizontal line speed of more than 300 miles/second! And the thing that remains astounding for me is that it can repeatedly trigger and track the same groove on the screen, with calibrated speed and mm accuracy. Outside of a physics lab, I’m not sure if anything on earth moves that fast!

--- End quote ---

It's like typing a laser pointer to a spinning motor and watching how fast the dot "moves across" a screen a few miles away. It'll be very fast* but it's not a miracle of engineering.

(*) Maybe even faster than the speed of light...!
H713:

--- Quote from: David Hess on December 21, 2022, 06:32:19 am ---The Tektronix 7104 can sweep faster than the speed of light, while at the same time being visible with a single sweep.

https://web.archive.org/web/20110926020847/http://www.oregonlive.com/silicon-forest/index.ssf/2011/09/a_tektronix_oscilloscope_that.html

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--- Quote from: Fungus on December 21, 2022, 06:44:11 am ---
--- Quote from: adam4521 on December 20, 2022, 09:17:51 pm ---But now at fast (but not exceptional) timebase of 20ns/div — get your calculator out to check me — the same beam is tracking horizontally at 500000 m/s, a horizontal line speed of more than 300 miles/second! And the thing that remains astounding for me is that it can repeatedly trigger and track the same groove on the screen, with calibrated speed and mm accuracy. Outside of a physics lab, I’m not sure if anything on earth moves that fast!

--- End quote ---

It's like typing a laser pointer to a spinning motor and watching how fast the dot "moves across" a screen a few miles away. It'll be very fast* but it's not a miracle of engineering.

(*) Maybe even faster than the speed of light...!


--- End quote ---

The fact that the beam can scan faster than the speed of light isn't an engineering miracle, but making it happen in at tube that is less than 30 inches long, and having it be readable with the naked eye is. The 7104 CRT (and the 7104 in general) is a true engineering masterpiece.
tggzzz:

--- Quote from: David Hess on December 21, 2022, 06:32:19 am ---The Tektronix 7104 can sweep faster than the speed of light, while at the same time being visible with a single sweep.

--- End quote ---

Oh, don't spoil tautech's assertion...


--- Quote from: tautech on December 20, 2022, 11:22:03 pm ---Which without some form of persistence is arguably of no use to anyone.

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And definitely don't ask him how people with skill and imagination did and can use such equipment to make quite astounding advances.
BillyO:

--- Quote from: bdunham7 on December 20, 2022, 10:55:52 pm ---Well, it really isn't 'moving', so there's no limit, not even the speed of light.  A Tek 2465B can move the dot (mostly vertically) over 8cm in 700ps.   That's about 71,500 miles per second or ~0.4c.

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The electric field is changing, but it it doing so very much further back in the beam where the rate involved is very much lower than the speed of light.
Njk:

--- Quote from: adam4521 on December 20, 2022, 09:17:51 pm ---I think, to summarise this energetic thread, that ‘true analog scope’ aka CRO has for some time transitioned to heritage technology.

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For those interested in heritage tech. Excellent free books about the USSR scopes (the nomenclature seems comparable to Tek and HP combined). Describes every related design house, lists all (as the authors claims) Soviet designs, and the post-Soviet scopes, up to 2019 I presume.

Now that company is behind the PicoScope brand so the information is from the horse's mouth.

The books are in Russian but there are a lots of images and it's not a paper scan so I think an automation can be used for translation.

https://eltesta.com/publications
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