Need help on identifying a mystery Korean oscilloscope - Page 1
Forum section: electronics / testgear

author: sakhmatd
author_rank: Contributor
timestamp: June 12, 2016, 06:40:14 pm
content: Hello!I've been looking around for an analog companion to my Rigol DS1052E and managed to score this little guy from EBay.The seller said that he doesn't know the brand or anything else other than it's made in Korea.The design and knobs look suspiciously like the (in)famousHung Chang OS-620, but this one has multiple triggering options and a different layout.I don't have the scope on me yet, but I was wondering if somebody could help me identify this puppy based on pictures. If not, I'll crack it open when I get it to try and gather more info.Hereare some more pictures.Thanks a bunch!

author: Jwalling
author_rank: Unknown
timestamp: June 12, 2016, 07:39:00 pm
content: Got to wonder why a manufacturer wouldn't put their name on it!Any idea if it supposedly works?Jay

author: sakhmatd
author_rank: Contributor
timestamp: June 12, 2016, 07:50:58 pm
content: Quote from: Jwalling on June 12, 2016, 07:39:00 pmJudging by this picture, I am inclined to say that it does indeed work, which is why I bought it. It looks like it had a manufacturer plaque on top of the screen there but then something happened to it maybe?

author: alsetalokin4017
author_rank: Super Contributor
timestamp: June 13, 2016, 03:17:47 am
content: Meguro MO-1252, Japanese not Koreanhttp://www.radiomuseum.org/r/meguro_mo_1252.htmlAlso appears to have been sold by Elenco Electronics.

author: tautech
author_rank: Super Contributor
timestamp: June 13, 2016, 05:32:10 am
content: Ha funny, there's a repair thread on one of these at the moment:https://www.eevblog.com/forum/repair/old-meguro-mo-1251-scope/

author: sakhmatd
author_rank: Contributor
timestamp: June 13, 2016, 05:41:23 am
content: Quote from: alsetalokin4017 on June 13, 2016, 03:17:47 amThe back of the scope says it's Korean. Judging by the colors it is indeed an Elenco MO-1252.Thanks!

author: sakhmatd
author_rank: Contributor
timestamp: June 13, 2016, 05:37:21 pm
content: Quote from: tautech on June 13, 2016, 05:32:10 amHeh, funny indeed. Hopefully mine arrives safely.

author: tautech
author_rank: Super Contributor
timestamp: June 13, 2016, 08:18:47 pm
content: Quote from: sakhmatd on June 13, 2016, 05:37:21 pmIf you inspect that thread you'll find the OP listed the wrong model in the thread title, corrected the title and provided a link for the full manual for MO-1252.That may of use to you.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: June 14, 2016, 12:50:56 am
content: Quote from: sakhmatd on June 12, 2016, 07:50:58 pmI could be wrong, but it looks like in the picture channel B is set to its max vertical sensitivity (at least down in the mv range), hooked to the 5Vp-p cal signal, but showing less than a full div high. Also, unless its just the way the picture was taken, the horizontal seems to be off as well, or at least horribly out of focus (signal focus/intensity, not camera focus).

author: sakhmatd
author_rank: Contributor
timestamp: June 14, 2016, 01:01:31 am
content: Quote from: tautech on June 13, 2016, 08:18:47 pmI actually found the manual on my own after I got the reply here, but I did inspect the thread, might be of use.Got the scope for only $60 shipping included, so if it works all well then that was a deal.Was outbid on a perfectly good Hitachi V-212 by a flimsy sniper-placed dollar at the same price.Quote from: CustomEngineerer on June 14, 2016, 12:50:56 amI'll report again when I actually get the scope and get to play around with it, hasn't been shipped yet and will probably take about a week after it does ship.I attached a few more pictures with the trace on them though. What's the most likely thing that can go wrong with it?

author: sakhmatd
author_rank: Contributor
timestamp: June 18, 2016, 03:05:59 pm
content: Just an update, I apologize for the double-post.Got the scope today, works pretty damn well. The calibration point is 0.5V p-p, the person who took the picture most likely had no idea what they were doing.Thanks for all the help.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: June 18, 2016, 06:12:18 pm
content: Glad to hear that it is working well. Hope I didn't cause you any extra worry. Enjoy your new tool!

author: David Hess
author_rank: Super Contributor
timestamp: June 18, 2016, 07:49:09 pm
content: The triggering is a littleQuote from: sakhmatd on June 12, 2016, 06:40:14 pmThey do look related.What is really different between them is the delayed sweep feature. The OS-620 has a single timebase while your mystery oscilloscope has a single timebase delayed sweep which is pretty unusual; it is sort of midway between having a single timebase and having a dual timebase delayed sweep.

author: sakhmatd
author_rank: Contributor
timestamp: June 18, 2016, 10:34:47 pm
content: Quote from: CustomEngineerer on June 18, 2016, 06:12:18 pmNah, I figure if it has a trace on it, then I could at least calibrate it and/or replace parts.Thanks.Quote from: David Hess on June 18, 2016, 07:49:09 pmI wonder if there are fifty million clones of this thing floating as well. The manual provides a full non-proprietary part list and even board templates for you to etch out.