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| True analog scopes |
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| vk6zgo:
--- Quote from: Fungus on December 18, 2022, 01:51:08 pm --- --- Quote from: vk6zgo on December 18, 2022, 01:29:30 pm ---CROs have both "Normal" & "Auto" trigger mode. When I am looking at various points in a DUT, I normally let the 'scope "free run" in Auto. --- End quote --- DSOs have the same, and a few more, eg. Single shot mode where you trigger once and it grabs the signal so you can look at it at in your own time, maybe even zoom in for a closer look... very useful, but CROs don't do it. --- End quote --- Obviously, "single shot" mode is very useful in applications where a non-recurrent signal needs to be examined, but for recurring signals, a decent CRO has dual/delayed timebases where you can "zoom" in on any point on that displayed waveform. You have to do it then & there, however. I was actually answering Mechatrommer who questioned whether "normal" triggering mode was available on CROs. I agreed that maybe Wallace Gasiewicz may have had his DSO on "normal" & it sort of "morphed" into a discussion of a useful method of using the "auto" trigger function for troubleshooting a circuit. |
| BillyO:
--- Quote from: Fungus on December 18, 2022, 01:51:08 pm ---DSOs have the same, and a few more, eg. Single shot mode where you trigger once and it grabs the signal so you can look at it at in your own time, maybe even zoom in for a closer look... very useful, but CROs don't do it. --- End quote --- Yes they do. My Tek 465 does. I also know the 475 and the 485 will too. |
| tggzzz:
--- Quote from: markone on December 18, 2022, 01:21:57 pm --- --- Quote from: tggzzz on December 18, 2022, 10:07:48 am ----snip No: when I returned to real-time embedded electronics, it was still 8-bit micros programmed in C. No change in 35-40 years :( Well, smaller, faster, cheaper, but that's only a change in degree, not in kind. The main things that have changed are nanopower and ADC/DAC speed/resolution. --- End quote --- Which period are you referring to ? --- End quote --- First period: early 80s to mid 90s. Second period: 2015 to date. Example technology: z80 and arduino atmega328 respectively. Yes, there were alternatives during both those periods, but those are sufficient to illustrate my point. --- Quote ---Anyhow, interesting discussion that brings back to mind the transition era from vinyl to CD music listening in late 80s toward 90s (luckily now finished), funny to note that at the end digital compressed music and class D amplification won hands down after billions of discussions about spectral fidelity, 0.001% THD, jitter and so on. --- End quote --- CDs very quickly established themselves as being superior to vinyl in all but one respect: sleeve art. ~1984 I remember listening on a high end (not audiophool!) audio system with a friend to http://arsnovaclassic.blogspot.com/2012/09/michala-petri-blockflotenkonzerte.html on both CD and vinyl. We could tell a slight difference, but not which was which, nor which was better. Compression needn't be an issue, but too often people compress too much. When my ears were remotely useful I didn't compress MP3 to less than 192kb/s. Compressed video on TVs is all to obvious, particularly where there is a colour gradient across the screen, e.g. underwater. --- Quote ---The only people that I know that still own an analog scope are old hams (age > 60) that never get through the navigation of two levels menu system. --- End quote --- Hams are a very poor sample set, for several relevant reasons! :) I am aware of very competent people that own both analogue and digitising scopes. They are aware of each instrument's characteristics and use the appropriate one. My principal (and principle) objection is to those that state analogue scopes should not be used and that only digitising scopes should be bought. That's wrong for several relevant reasons. |
| vk6zgo:
--- Quote from: BillyO on December 18, 2022, 02:25:45 pm --- --- Quote from: Fungus on December 18, 2022, 01:51:08 pm ---DSOs have the same, and a few more, eg. Single shot mode where you trigger once and it grabs the signal so you can look at it at in your own time, maybe even zoom in for a closer look... very useful, but CROs don't do it. --- End quote --- Yes they do. My Tek 465 does. I also know the 475 and the 485 will too. --- End quote --- The 7613 also has it. I've played around with it, but never really got a lot of sense out of it. When/if I fix it, I will have to try again. |
| Mechatrommer:
--- Quote from: vk6zgo on December 18, 2022, 01:29:30 pm ---CROs have both "Normal" & "Auto" trigger mode. When I am looking at various points in a DUT, I normally let the 'scope "free run" in Auto. --- End quote --- and probably Wallace Gasiewicz's CRO doesnt have that feature, since from the way he stated, he never see "Normal" triggering effect in his CRO. |
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