Analog VS Digital Scopes for Glitch Captue 

I still use one... Tektronix 7734, 400MHz, 4 bay modular analog scope. I have an array of vertical amplifiers to choose from, and it is equipped with 2) 7B92A time base plug-ins. When it was new, it cost more than my house.

Horribly expensive! Very good for capturing fast pulses, but the storage decayed away quite quickly. Going back nearly 40 years now, so if I remember correctly there was a fine mesh screen in front of the phosphor which was "Lit" by a separate electron gun a " flood gun " this charged up the mesh or maybe discharged it, when the normal electron beam hit the mesh it changed the charge on it, and that's what the phosphor showed. The mesh slowly lost it's charge, and then the image washed out. (I remember the display slowly getting brighter all the time) So you frequently needed to erase the image and start over. Not something that you would leave on for hours at a time, maybe a minute or two if you were lucky. I've probably got some of that backwards, but you will get the idea. Andy

@@andye2005 properly adjusted storage tube can store a waveform reliably for hours without the "washing out" effect you mentioned (it all depends on the flood gun emission and its colimation, which has a sweetspot where it maintains the waveform nicely, too much the image got brighter and eventually washed out, too little and the image would slowly dissapear). Also as with all analog instruments, for maximal accuracy you need to let them warm up for some time (hour or 2), so in your case if you just turned the instument on to capture some waveforms without letting it warm up first then the flood gun emission was likely out of cal and cause all those issues you mentioned.

They were neat, but still not as good as a digital scope for this purpose.

@@MrSlehofer Interesting, The scope in question was some sort of Tek, and as far as I know it was never able to store a image for more than a few mins. As it was the only one of two such scopes in the company, it wold not surprise me if it had some sort of fault on it. I found the second storage scope (an HP model) on the bottom shelf of the "dead" test equipment racks. The repair cost for it was so high that it was still there when I left the company. Andy

Analog persistence mode

Or the Bil Herd way, stare at the scope, then look at a blank wall and you will see the faint glitches 😉🤣

I'll have to try that; got a Soviet S1-64 analog scope that appears to have long-ish afterglow.

Used to do just that when looking at Radar tubes. We have a 3ft long tube that you shoved over the display and there was a hole at the other end for the camera. So no problems with focus and so on. Open the shutter, count to 4 and then release. Worked very nicely. We also has "adaptors" to use the camera on scopes. Andy

Yip I used black and white polaroid to catch glitches in the day (early 90's). Opened shutter on camera, ran test software, when error detected close shutter, develop film, wave it around, wave it a bit more and there it was, in black and white, a 10ns runt pulse on the write line of a FIFO causing the empty and full flags to get out of step. One cause was ground bounce, as pulse was value of data related (no of 1's in the word) and other only seen when using the outer output pins of GALs. Those were the days.

HP 54616B also have peak detect sampling mode.

Suggest you turn on digital mode on the Fluke.

Yep, the 2467 had its "brighteye" micro channel intensifier running at 350 or 400(2467B) Mhz. I'm lucky to have this classic, still great analog scope.

And don't forget the 7104...

I've done it many times. Never had a scope lock up on me.

Well now I know.

@@EEVblog2 Same thing for the measurements - you can swipe them off the screen to the right. Also, if you have no measurements and want more area for the waveforms - touch/click the small vertical group of three dots on the right edge of the waveform graticule - this will collapse the measurement badge area, expanding the waveform view. Tap the dots again to re-open the measurement badge area.

Cool,Im looking into something like this, but almost $500 is alittle much and the reason i was looking into something like this was for it to be a lot cheaper, and did find a similar thing for around $100. Its software was terrible and so are the specs but the opensource software for it was reportedly good. Some guy said it chagned the oscilliscope, which had me thinking how much of it is dependant on hardware and how much software? What the bare minium hardware you'd need to get this data for a computer to interpret? Could an Arduino solution be good enough? I was looking into something like this aswell ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LpbKPiw65_Q.html

It's a very handy test signal!

@@EEVblog2 true, no matter if it's intended functionality or not :)

Runt pulses often happen with "bus contention", where two devices try to drive a bus line simultaneously (to opposite states).

Nope, pure analog.

I have a 2467 - I might have to do this... ;-)

@@w2aew there was so much wizardry involved with the 246x series. Absolute peak of analog scope tech.

MCP CRT-equippped 'scopes like a Tek 7104 or 2467(B) have no problem showing those rare events happening at 1/10000 - 1/1000 duty cycle. Problem is that the brightness (of the regular signal) would have to be set rather high, adversely affecting lifetime of the MCP CRT. On a Tek TDS3000-series 'scope (3kwfms/s) runt triggering and using longer persistence helps a lot - but you have to wait till it catches the event!

Depends if you are watching or not.

@@EEVblog2 😂

Are waves real or just photons?...