Author Topic: UNI-T UT61E Multimeter teardown photos.  (Read 498892 times)

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Offline Monkeh

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #150 on: May 03, 2012, 10:58:19 am »
Yes, the mV will go to OL with the leads in the air. Tested it right now with my 61E. The mV setting has no autorange so it will go by default to OL.

Thank you, so my meter is not broken. I'm still wondering why it does that and why it's different for the mV AC range.

Put the meter into the 2VDC range and turn min/max on. Now rub a plastic bag over the case over the input terminals.

Remember, the mV range maxes out at 220mV.
 

Offline LEECH666

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #151 on: May 03, 2012, 10:37:22 pm »
I wasn't aware that the mV range is that sensitive to static charges. Thanks for clearing that up.

Florian
 

alm

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #152 on: May 04, 2012, 03:32:10 am »
Input impedance in the 220 mV range is specced as > 3 Gohm, input impedance in the higher DCV ranges is around 10 Mohm. It does not take a lot of current (think induction) to produce 220 mV in a 3 Gohm load.
 

Offline flodins

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Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #154 on: May 24, 2012, 02:26:52 am »
Meh ... if i want to take picture i would use my D3100 but this is a rough one since you guys know mostly what's inside but there are differences in this 2011 batch version


« Last Edit: May 24, 2012, 02:32:41 am by DaveXRQ »
 

Offline PedroDaGr8

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #155 on: May 25, 2012, 06:08:13 am »
Meh ... if i want to take picture i would use my D3100 but this is a rough one since you guys know mostly what's inside but there are differences in this 2011 batch version




Yeah that looks like the version I got and Tektronix has some Hi-Res pics of on page 8. I think they made some improvements in layout and overall build quality with respect to the board. The resistor network is now soldered in properly, most components match the silk screen, etc.

I must say that after having it owned it for a few months I am still incredibly happy with this multimeter. This meter is truly perfect for the serious hobbyist. I really think its one of the best, if not the best, in the price range. It's very hard to find something this well put togther and still have it hit the sub-$60 price point. I really think they hit the low end pretty well. The UT10A at  $12.70 seems to be a capable cheap pocket meter review on here by Lightages). The UT33D at a similar price adds features (loses autoranging though). Then the UT61E is also great. it seems like they are great at the low end stuff not so much at the high end. Heh.


Oh yeah, I read somewhere that the biggest model change in the 2011 versions that they use a higher precision resistor/divider network.
« Last Edit: May 25, 2012, 06:55:08 am by PedroDaGr8 »
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #156 on: May 25, 2012, 09:58:20 am »
My pics are pretty bad because lighting is non-existant on my glass table ... haven't taken my hi-res cam out yet
 

Offline Milton

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #157 on: July 04, 2012, 08:29:25 pm »
UNI-T UT61E

USB Mod and Backlight Mod (website in Russian)
http://we.easyelectronics.ru/ACE/dorabotka-napilnikom-multimetra-ut61e.html
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #158 on: July 05, 2012, 01:38:18 am »
UNI-T UT61E

USB Mod and Backlight Mod (website in Russian)
http://we.easyelectronics.ru/ACE/dorabotka-napilnikom-multimetra-ut61e.html

Backlight mod ... not gonna lose a epic hold for that
 

Offline LEECH666

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #159 on: July 05, 2012, 06:05:24 am »
I don't think this is the same backlight mod the other guy showed us here on the forums. From what I get from Google Translate it uses an ATtiny13 µC to implement an auto off function too.

http://translate.google.de/translate?sl=auto&tl=en&js=n&prev=_t&hl=de&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwe.easyelectronics.ru%2FACE%2Fdorabotka-napilnikom-multimetra-ut61e.html&act=url

Shouldn't it be relatively easy to write a software for the µC that meassures how long the button was pressed and then trigger the respective functions (hold, backlight on/off, display freeze hold) accordingly?

Maybe someone who speaks Russian can translate that article, so that we can make more sense of it. I am not sure that you lose the Hold function.

Florian
 

Offline nukie

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #160 on: July 05, 2012, 12:31:34 pm »
The 61 series is applauded for its excellent linearity.

tapatalk
 

Offline dimitrioptimus

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #161 on: July 09, 2012, 02:22:38 am »
By looking the spec sheet I noticed that

Capacitance range is(22nF/220nF/2.2mF/22mF/220mF/2.2mF/22mF/220mF) does it means that I can't measure 4000uF electrolytic capacitors?

On the other hand Ut61C can (40nF/400nF/4mF/40mF400mF/4000mF)

So is that UT61C has larger range than UT61E ?

Specs-Ut-61C----http://www.uni-trend.com/UT61C.html
 Ut-61E-----http://www.uni-trend.com/UT61E.html


Noobs question  :-[
 

Offline cuban8

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #162 on: July 09, 2012, 03:07:31 am »
FYI- 4000uF is 4mF.
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #163 on: July 09, 2012, 04:32:50 am »
By looking the spec sheet I noticed that

Capacitance range is(22nF/220nF/2.2mF/22mF/220mF/2.2mF/22mF/220mF) does it means that I can't measure 4000uF electrolytic capacitors?

On the other hand Ut61C can (40nF/400nF/4mF/40mF400mF/4000mF)

So is that UT61C has larger range than UT61E ?

Specs-Ut-61C----http://www.uni-trend.com/UT61C.html
 Ut-61E-----http://www.uni-trend.com/UT61E.html


Noobs question  :-[

Read the PDF properly, they quote 4000uF
As for the UT61E, of course it's not so weak it's written all over on this forum that it's got the most substantial range of the 60$ meter range. And i own one definitely
220mF ... that's 220,000uF at 2% accuracy ( chipset, UNI-T didn't do a test )
 

Offline PedroDaGr8

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #164 on: July 12, 2012, 05:29:36 am »
By looking the spec sheet I noticed that

Capacitance range is(22nF/220nF/2.2mF/22mF/220mF/2.2mF/22mF/220mF) does it means that I can't measure 4000uF electrolytic capacitors?

On the other hand Ut61C can (40nF/400nF/4mF/40mF400mF/4000mF)

So is that UT61C has larger range than UT61E ?

Specs-Ut-61C----http://www.uni-trend.com/UT61C.html
 Ut-61E-----http://www.uni-trend.com/UT61E.html


Noobs question  :-[

Read the PDF properly, they quote 4000uF
As for the UT61E, of course it's not so weak it's written all over on this forum that it's got the most substantial range of the 60$ meter range. And i own one definitely
220mF ... that's 220,000uF at 2% accuracy ( chipset, UNI-T didn't do a test )

Good eye there Dave.

The Uni-T website uses the wrong SI abbreviation for the capacitor series.
The website says 40nF/400nF/4mF/40mF400mF/4000mF for the 61C but it SHOULD read 40nF/400nF/4uF/40uF/400uF/4000uF.
Interestingly, the 61E website says: 22nF/220nF/2.2mF/22mF/220mF/2.2mF/22mF/220mF but the mF that should be uF have a different m (it has serifs on it, while the one for mF is sans serif).

Either way. the 61E is significantly better than the 61C.
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #165 on: July 13, 2012, 02:06:27 am »
Sometimes to read their manuals you really have to anticipate what they wanted to write in the first place.
But yeah, the UT61E only costs a slight bit more plus i'd rather have a proper dedicated temp. meter ITFP
 

Offline sdttn

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #166 on: July 17, 2012, 06:12:19 am »
My new teardown pictures are in here.

I do this new teardown for the sigrok project.
 

Offline dinoboy

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #167 on: July 18, 2012, 07:52:58 am »
[...]

So do we all agree that the UT61E is a great, accurate DMM, especially for its price? As most people in this thread i bought mine from Dinodirect (no shilling haha) and thanks to the discount code, dinopoints and giftcards etc i paid only like 31$ (please no envy!! ;) ). since its acquisition i use it every other day to measure battery voltages (NiMH, LiIon) or continuous currents in flashlights (with the UT61E serial connection PC cable). i already had to replace the 9V UNI-T battery!!

The only measurement flaw it has is its high burden voltage -- but this is a rather common problem with any cheap or expensive DMM afaik.

i like the DMM a lot, it costs now ~59$ on DX.com (=double the price i had paid hehe). Because of a missing comprehensive user guide, i still dont understand the proper usage of all functions (e.g. the Min-Max buttons with several examples) but i can live with it.
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #168 on: July 18, 2012, 08:08:00 pm »
Of course it's a excellent meter for it's price.
It's specs are quoted at 1 year and is next-to-next with the 87v
Always remember: You get what you pay for, if you don't expect absolute safety of course you know you won't be getting it
No point calling the 61E a terrible meter just because it's doesn't have those oh so lovely 20kA huge hrc fuses
 

Offline dinoboy

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #169 on: July 18, 2012, 10:42:37 pm »
It's specs are quoted at 1 year and is
Hi, why are you mentioning time ("1 year")? What role does time play in the discussion of a multimeter? My PC is 10 years old and it works like ever! :D
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #170 on: July 18, 2012, 11:04:21 pm »
It's specs are quoted at 1 year and is
Hi, why are you mentioning time ("1 year")? What role does time play in the discussion of a multimeter? My PC is 10 years old and it works like ever! :D

Because that's what they said. Minimum guaranteed 1 year stability just like any proper meter is quoted at 1 year stability
 

Offline dinoboy

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #171 on: July 20, 2012, 10:42:03 pm »
Because that's what they said. Minimum guaranteed 1 year stability just like any proper meter is quoted at 1 year stability

so after 1 year we would have to recalibrate the thing?
Are FLUKE's the same, with only 1 year guaranteed stability?
Sounds poor :)
 

Offline SeanB

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #172 on: July 21, 2012, 01:11:43 am »
Generally after a year the short term drift and thermal shift from assembly have levelled out to only give the long term drift as the dominant effect over temperature caused drift. You calibrate after a year to get the best accuracy, as a new reference or a newly soldered unit will have an offset that slowly decays to a long term trend.

It might read 1.0000V initially, and after a year it might read 0.9997V, with the same reference source, which has been powered for years and kept at a constant temperature and certified with a traceable source to a standard volt.
 

alm

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #173 on: July 21, 2012, 02:42:40 am »
Carefully characterized DMMs are usually specified for 24h, 90 days and 1 year accuracy, within a certain temperature range. Long term drift is rarely specified, but in good designs (eg. Fluke 87), this can be expected to be close to the 1 year figure, since drift tends to level off with time as SeanB mentions. By far the most drift will be within the first year.

In the case of Uni-T, you'd be lucky if it meets the 1 year spec, all bets are off for long term stability. People with the equipment to test DMM stability are not usually interested in cheap handhelds. Cal labs don't have much data on them either, since people rarely send them in for calibration.
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #174 on: July 21, 2012, 04:05:46 am »
Carefully characterized DMMs are usually specified for 24h, 90 days and 1 year accuracy, within a certain temperature range. Long term drift is rarely specified, but in good designs (eg. Fluke 87), this can be expected to be close to the 1 year figure, since drift tends to level off with time as SeanB mentions. By far the most drift will be within the first year.

In the case of Uni-T, you'd be lucky if it meets the 1 year spec, all bets are off for long term stability. People with the equipment to test DMM stability are not usually interested in cheap handhelds. Cal labs don't have much data on them either, since people rarely send them in for calibration.

And the calibration probably costs more than the meter
 


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