ATTENTION! microcontroller-based "clones" of 830 DDMs are detected - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: January 16, 2018, 01:16:55 pm
content: ATTENTION! microcontroller-based "clones" of 830 DDMs are detectedLooks like classic DT-830BBut:pcb looks "empty"based on MC instead of ICL7106dynamic LCD instead static oneSo new era is coming

author: Fungus
author_rank: Super Contributor
timestamp: January 16, 2018, 01:28:06 pm
content: Link?

author: ovnr
author_rank: Frequent Contributor
timestamp: January 16, 2018, 01:38:04 pm
content: And for those that'd have to google it otherwise, since there's a typo in the thread title: This refers to some small shitty multimeters - you know, the $5 specials with manual range selection and everything.

author: tszaboo
author_rank: Super Contributor
timestamp: January 16, 2018, 01:40:43 pm
content: The DT830 is trash. It has no input protection, no redeeming value whatsoever. This is the kind that you get as a present from someone, who hates you, and you dont feel like throwing it away.Who cares, if there is something else inside. Its like complaining about getting a slightly worse turd.

author: Fungus
author_rank: Super Contributor
timestamp: January 16, 2018, 01:45:59 pm
content: Quote from: NANDBlog on January 16, 2018, 01:40:43 pmThe LCDs are usually very good. I'm not sure why nobody else gets theirs so black/contrasty.

author: 001
author_rank: Super Contributor
timestamp: January 16, 2018, 02:12:07 pm
content: Quote from: Fungus on January 16, 2018, 01:45:59 pmbecouse classic ICL7106 use STATIC indication wayAnd ideal connection testQuote from: NANDBlog on January 16, 2018, 01:40:43 pmWhy do You say that? Repair of classic 830 dmms is a sort of legal buisness for mens who had bundle of NOS IC.New MC based "clones" is not good for repair

author: bd139
author_rank: Super Contributor
timestamp: January 16, 2018, 03:30:50 pm
content: Hopefully they’ll be 10M impedance.They’re fine for noddy testing jobs and monitoring.Hell the 4mm jacks are usually better than Uni-T’s top end efforts on the duratool branded ones as wel.

author: Monkeh
author_rank: Super Contributor
timestamp: January 16, 2018, 03:34:35 pm
content: Quote from: 001 on January 16, 2018, 02:12:07 pmWhy on earth would you repair a cheap meter which is literally given away?

author: free_electron
author_rank: Super Contributor
timestamp: January 16, 2018, 03:39:00 pm
content: 7106 is NOT static. there is a BP connector which carries a square wave. so they make a dynamic output.anyway. you can get this for 1.44$ on alibaba... i wouldn't even use it to stop a wobbly table...

author: 001
author_rank: Super Contributor
timestamp: January 16, 2018, 03:39:58 pm
content: Becouse $5 per day is a good labour cost somewere

author: rsjsouza
author_rank: Super Contributor
timestamp: January 16, 2018, 04:58:15 pm
content: 001, do you have a link to a model that has a uC?

author: BradC
author_rank: Super Contributor
timestamp: January 16, 2018, 05:09:18 pm
content: Quote from: NANDBlog on January 16, 2018, 01:40:43 pmWhat a load of elitist frogshit. I've given plenty away. Before gift, no meter. After gift, meter perfectly capable of indicating voltage for cars/bikes and as a bonus can do a continuity test too. I'm sure not going to give away a more expensive meter, but because of the "affordability" of such meters, suddenly people can do basic electrical checks on low voltages at almost no cost.

author: 001
author_rank: Super Contributor
timestamp: January 16, 2018, 05:22:26 pm
content: Quote from: rsjsouza on January 16, 2018, 04:58:15 pmI see it at my work at local market. I cant repair it and owner angry nowIt is serious buisnes here

author: Monkeh
author_rank: Super Contributor
timestamp: January 16, 2018, 05:23:35 pm
content: And what microcontroller was it?

author: 001
author_rank: Super Contributor
timestamp: January 16, 2018, 05:25:31 pm
content: It looks as nude crystal

author: Monkeh
author_rank: Super Contributor
timestamp: January 16, 2018, 05:26:43 pm
content: Nude.. crystal? It was a piece of quartz?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 16, 2018, 05:28:53 pm
content: Quote from: free_electron on January 16, 2018, 03:39:00 pmAll LCDs are AC driven.Static drive simply means there is a single backplane, as opposed to multiplexed displays that use what is effectively a matrix of backplane and segment lines. Static probably erfers to the fact that there is a single voltage, whearas multiplexed displays use multiple voltages.This is a common term for this type of display :http://www.onsemi.com/PowerSolutions/product.do?id=LC75832Whttp://www.pacificdisplay.com/lcd_static_drive.htm

author: Dwaine
author_rank: Frequent Contributor
timestamp: January 18, 2018, 08:25:51 am
content: Quote from: 001 on January 16, 2018, 03:39:58 pmWow... Some people need to be punished....

author: EEVblog
author_rank: Unknown
timestamp: January 18, 2018, 10:50:07 am
content: Quote from: 001 on January 16, 2018, 03:39:58 pmThat's actually inside a production DT-830B meter?

author: ArdWar
author_rank: Frequent Contributor
timestamp: January 18, 2018, 11:49:57 am
content: Quote from: EEVblog on January 18, 2018, 10:50:07 amI think that's "repair of classic 830 dmms using bundle of NOS IC"I admit that's indeed some dedication there.I understand that in some place 830s is the only affordable and available DMM. Yet, most (all?) of these users here just toss it away when it breaks and buy a new one - never I seen one repairing it.(Yes, there's maybe some similarly affordable but better Chinese wonders but the leadtime and shipping can be months, and some people just cant/don't want to deal with international online shopping)

author: Fungus
author_rank: Super Contributor
timestamp: January 18, 2018, 12:16:59 pm
content: Quote from: EEVblog on January 18, 2018, 10:50:07 amI don't believe it. There's no way that DIP chip, wire, solder, etc. costs less than the chip they usually blob onto the board.

author: bd139
author_rank: Super Contributor
timestamp: January 18, 2018, 12:41:46 pm
content: Yeah the blob or even the PLCC clone version of the 7106 is ubiquitous. DIP one would be more expensive to add and sell.Also probably doesn't do a lot for the input pins. They usually have guard rings and all sorts on the board.

author: kalel
author_rank: Frequent Contributor
timestamp: January 18, 2018, 12:57:29 pm
content: I heard these are pretty accurate. Is there any reason an MCU version of the meter at similar price might be less accurate? Just wondering, as I like this meter (the beep version) due to its very low price, small size, and being useful for continuity, battery voltage, etc. We all know about the safety issues, so I would not repeat them here.