Digitec (united systems corp) 2210 multimeter manual.. any manual.. - Page 1
Forum section: electronics / testgear

author: CHexclaim
author_rank: Regular Contributor
timestamp: May 09, 2022, 08:03:25 pm
content: Hello all,I have a benchtop multimiter that belonged to my dad. I've always though it was an old fluke of some sort, but now, that I am trying to bring it back to working condition, I see it is a Digitec (united systems corp) model 2210.The display is a 4 and a half digit, but when I look inside the construction shows details of a very good performing unit.It powers up but something is wrong. The cabinet paint is all corroded, maybe aluminum rust..In my simple google searches I cannot find even the user manual or specifications. Could anybody help getting a manual. Perfect if it is a service manual, but user manual also helps.Thank you all. CH!

author: CHexclaim
author_rank: Regular Contributor
timestamp: May 11, 2022, 06:35:47 pm
content: Ok, I found the manual, the actual printed manual. It was at my dad's house. At a first glance it has schematic and calibration procedures.So, if someone needs the manual let me know.CH!

author: BullyFreeBear
author_rank: Contributor
timestamp: February 19, 2025, 09:53:52 am
content: Hi, I was wondering if you could send me a copy of the manual?I would like to calibrate the IBM version that I had got a little while back.

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 19, 2025, 01:42:07 pm
content: Sure! let me scan it and I'll try to post it here..On the other hand I couldn´t repair mine yet as I cannot find a replacement for one of the ICs... I'll check on that too and post it here to see if someone can help.CH!

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 21, 2025, 01:57:37 am
content: Hello, I don´t know if I can attach links here as the scanned file is too large to attach it.https://drive.google.com/file/d/1fvbS53GMoDEA9g35Xw0aOL36LXzcNuRL/view?usp=sharingPlease let me know if you can download it correctly as I would like to discuss the pending repair of mine.Regards,Charlie

author: mwb1100
author_rank: Frequent Contributor
timestamp: February 21, 2025, 06:02:31 am
content: The PCB photos from 2022 look like artwork!

author: BullyFreeBear
author_rank: Contributor
timestamp: February 21, 2025, 09:46:04 am
content: Thank you for the scan, they look great!I was looking at the calibration procedure and its ALOT different from my simple Heath-kit VTVM, I don't have all the fancy equipment that they mention.I want to help you fix your meter but I'm an armature when it come to this stuff so through some questions over, ill see if I can help at all. If you need any voltage readings or a picture of a sinewave from one of the IC let me know, because I would gladly check.

author: BeBuLamar
author_rank: Super Contributor
timestamp: February 21, 2025, 12:04:17 pm
content: looks like a very nice meter. Hope you get it working.

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 21, 2025, 01:11:18 pm
content: No worries. The one I have also comes from IBM, did you see that there is an addon page at the start of the manual for the IBM models.Anyhow, the problem I have is that one of the main ICs (I don´t recall now the model) is toasted and I cannot find a similar one online. Maybe someone can suggest places to look for other than the usual Digikey / Mouser, etc. sites.Later I'll check what I believe is wrong with it an post it here.Thanks, Charlie.

author: lowimpedance
author_rank: Super Contributor
timestamp: February 22, 2025, 02:28:16 am
content: Quote from: CHexclaim on February 21, 2025, 01:57:37 amYou could just split the schematic parts, and then its easier to fit the file size here.It would at least keep the important information within the forum.Many older threads here have lost important documentation as it was linked off site. With the possibility that the off site host dissapear, and this has happened, those threads loose valuable contributions.Anyway what is the part number of the dead IC ?

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 22, 2025, 08:11:21 am
content: Agree with the documentation getting lost.Ok, lets see, I've splitted the pdf in 3 parts with pdfseparate and pdfunite.. I'll attach part 1 of 3 here..CH!

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 22, 2025, 08:15:47 am
content: Part 2 of 3

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 22, 2025, 08:16:51 am
content: Part 3 of 3.

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 22, 2025, 08:37:26 am
content: About the burnt IC I remember arriving to the conclusion that IC3 on the Display board was bad. Could not find it anywhere..Thanks for any hint on sourcing it of an equivalent replacement.I see now a crazy transistor thereCH!

author: tautech
author_rank: Super Contributor
timestamp: February 22, 2025, 09:02:16 am
content: Quote from: CHexclaim on February 22, 2025, 08:37:26 amIt's a PUT.

author: lowimpedance
author_rank: Super Contributor
timestamp: February 22, 2025, 10:32:58 am
content: PUT = Programmable unijunction transistor. Not popular parts in general!That one on the pcb is clearly a ring in, (not original).Search it's part no for info.As for the MM5330N, that would be rather hard to get, search of the part number shows ebay whether you trust that or notAt least the data sheet is still available to download.

author: Kean
author_rank: Unknown
timestamp: February 22, 2025, 11:10:40 am
content: 2N6027 is an interesting partNew old stock MM5330N can be found on eBay, probably OK depending on seller location and reputation.

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 22, 2025, 09:02:29 pm
content: Thanks for all the info.I've just bought on ebay some MM5330N and some PUTs too. The last time I checked (some years ago when I started with the restoration of the unit) I couldn´t find any. At that time I remember painting the enclosure, etc, to find out I could not fix itThis gives me hope!!Thanks CH!

author: BullyFreeBear
author_rank: Contributor
timestamp: February 22, 2025, 09:14:46 pm
content: Could you send a picture of the enclosure you painted? I would like to see it.

author: CHexclaim
author_rank: Regular Contributor
timestamp: February 22, 2025, 09:22:13 pm
content: It's all disassembled in parts. If everything goes well, after I have the unit working and assembled again I'll post photos. It may take some time though.

author: tautech
author_rank: Super Contributor
timestamp: February 22, 2025, 11:26:34 pm
content: Quote from: lowimpedance on February 22, 2025, 10:32:58 amPUT's came after UJT's which were often used for dual SCR phase control for high current AC control.The advent of Triacs and Alternistors hastened their demise.