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| UNI-T UT61E Multimeter teardown photos. |
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| setq:
Doh. I think that'd blow up a lot of things. I'd chuck it and buy another one. As for safety, I've got a UT61E. It occasionally gets stuck across the mains. If it blows up, it blows up. I'll just buy another one. I'd have to buy 8 of them before I caught up with a Fluke's pricing. If I'm going to kill myself it is more likely due to human error, probing errors etc than anything to do with the meter exploding. Daily use it sees 5mV-300v DC. However going back not so far ago, the status quo of meters was far more dangerous than a UT61E. Even a relatively recent 1980s FET based meter from a respectable brand I saw had a negative terminal connected to the chassis and a non-earthed supply. Stuff that across the mains and things get interesting. Most of the fluff that Fluke point out about safety isn't relevant or useful to the average user. |
| MosherIV:
--- Quote ---Guys, I killed my brand new UT-61E. Tried to measure voltage on a microwave transformer and device turned off forever. Yes, that was dumb, I know. But any chance to get it back? Nothing happens when I rotate the dial, screen remains off. Battery is fine. I see no visible damage to internals. The only thing happening inside is W1 (linear voltage regulator 7201U30 is becoming warm). I desoldered and checked this LDO and it works fine itself. So i guess there is some kind of short circuit somewhere down the road. Any hope it is not a main chip? Should I check something else? The schematics of the device is a bit too complex for me, I am a newbie. Thanks! --- End quote --- It sounds like you have blown the main chip. Without the MOVs in place there was no chance of the input protection stopping KV, even with them fitted joeqsmith proved they can be inadequate. The main chip is not obtainable, the chip manufacturer does not sell on the open market. Salvage what you can and get a new DMM. Most DMM are not capable of measuring thousands of V (KV) - do no attempt it again unless you like spending money on DMMs ::) |
| joeqsmith:
--- Quote from: igi on October 12, 2016, 08:38:13 am ---Can't justify myself to throw new shiny device into a trash bin. --- End quote --- I wouldn't. Driving over it, throwing it out the car window, dropping it from 3 or 4 stories and shooting it with an arrow are all little overdone. Make a video of what you come up with. |
| Hydrawerk:
--- Quote from: igi on October 12, 2016, 08:38:13 am ---Tried to measure voltage on a microwave transformer and device turned off forever. --- End quote --- I think that even Brymen BM869 will be damaged by 2000V 500mA or so. Hardly any DMM can handle 2000V for a long time. :( |
| analogix:
My old multimeter has finally given in and it seems the UT61E is the way to go (this is for hobby use -mostly measuring low voltage stuff and the occasional AC household (230V) measurements). Have the safety issues been resolved with the currently available UT61E? Where's the best place to order it from these days? Apparently, the "GS" European version isn't available from the many Chinese low cost sources but through various German dealers such as Pinsonne-elektronik (75 Euros). But confusingly many Chinese dealers sometimes show a mix of the "GS" and "China" version of the unit along with USB and serial cables, and if you ask them about it they seem to tell you what they think you want to hear and really have no clue other than to shift as many cardboard boxes around as they can! So, if I don't want to pay the much higher "GS version" costs, where's a good place to get it? (of course, if some low cost Chinese dealer does have the actual "GS" version for sale cheaper than buying it from a dealer in Europe I'll definitely be going for that instead). And does the current version now come with a USB cable or is this also a random thing? |
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