Products > Test Equipment
True analog scopes
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tautech:
vk6zgo
Here's what a $500 DSO can do these days but not without some trigger Holdoff to prevent retriggering and then I cocked up using the falling edge trigger from a previous decoding demo to a customer.  :palm:



We could also use a Pulse or some period trigger to get more precise results but that should give you an idea.

Now we have affordable scopes with zone triggers a new world opens and with the base model in this range now just $1k until years end offers so much more as plain standard capability without requiring purchase of some $ option.  :horse:

First is much the same as the cheaper 4ch X-E and this time with a rising trigger.  ::)



Or we can punch a STOP to check what's really there:



Our we can go all out and use one of the Zone triggers with a Not Intersect setting

tggzzz:

--- Quote from: vk6zgo on December 14, 2022, 12:01:17 am ---The Analog video failing seemed to bedevil DSOs for many years, especially the cheap ones, as witness many horrific displays of video waveforms appearing on the Internet.

--- End quote ---
(many sensible points snipped)

Not being able to display a video signal was an easily defined and understood example of a general problem. Readers could easily extrapolate that example to see how it could cause problems with the waveforms they needed to observe.

Curiously one early (1980) Tek got it right: the Tek 468. It has a 10MHz useful digitising bandwidth, and can display "modulation" or "mean" waveforms. The "modulation" setting is called "peak detect" nowadays.

Later Tek scopes couldn't, since they used a CCD to sample the waveform for subsequent digitisation.


james_s:
I'm skeptical that anyone is actually producing new analog scopes anymore. I could see there being a few thousand of them stacked in a warehouse somewhere that are being sold to the small handful of customers still buying one but there can't possibly be enough demand for mass production.
james_s:

--- Quote from: 2N3055 on December 13, 2022, 08:56:18 pm ---I said truth, only thing CRT scope does better is X-Y, but difference is only visible with scope art. I have no use for scope art, but i don't judge.
If someone likes it, good for them.

--- End quote ---

I use my analog scope when working on vector arcade game boards. No DSO that I've tried could even display a recognizable image.
tautech:

--- Quote from: james_s on December 14, 2022, 09:06:50 am ---
--- Quote from: 2N3055 on December 13, 2022, 08:56:18 pm ---I said truth, only thing CRT scope does better is X-Y, but difference is only visible with scope art. I have no use for scope art, but i don't judge.
If someone likes it, good for them.

--- End quote ---

I use my analog scope when working on vector arcade game boards. No DSO that I've tried could even display a recognizable image.

--- End quote ---
Screenshot please.  :-DD
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