UNI-T UT61E Multimeter teardown photos.

[dimitrioptimus]

Found this nifty gadget,

http://www.voltagestandard.com/DMMCheck.html

for those who wants to caliibarate thier DMM,though not necessary for Ut61E cuz already very tuned,but because pots are their it is possible

for more info visit this :-

http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.messerforum.net%2Fshowthread.php%3F100485-Multimeter-pr%25FCfen-kalibrieren-justieren%26p%3D802825%26viewfull%3D1%23post802825&act=url

[Ivanko1]

Finally I got my UT-61E. How can I test it on the correct performance, make sure that it is fully working and correctly measure?
There is another more simple multimeter Victor 81D.

[Rick]

Finally I got my UT-61E. How can I test it on the correct performance, make sure that it is fully working and correctly measure?
There is another more simple multimeter Victor 81D.

You can of course check it against your Fluke 87 V

[Ivanko1]

Why not?

[mariush]

So it's accurate.

Only 1000uF is different, but then again at capacitance the error margin is 3%+5 counts .. .that would be about 30uF at 1000uF ... and I think the Fluke is also about 2% at that large capacitance value, so you can't say it's faulty.

Everything else seems to be a few counts above or below, certainly within the specified tolerances.

[Ivanko1]

I get this from little review http://www.embed.com.ua/raznoe/multimetr-uni-t-ut61e-iz-kitaya/

Does 61E not have auto off? There signin (S) - Data Processing? No cable plugin, how it turn off?

[mariush]

The data logging is always on , so there is no auto power off.

You can solder a few wires inside and make auto power off work, there is a hack published on this forum, possibly on the first page of this thread ... not sure not, it may be the other hack with the backlight.
Either way, it's on this forum, in this thread or another thread.

[TorqueRanger]

Is it possible to upgrade the safety features of the meter without compromising the accuracy of the meter ??

[T4P]

Yes.

[dimitrioptimus]

Yes.

How ?

For me the main concern is if probes are inserted in wrong slots when measuring.

[dimitrioptimus]

Did anyone figured out how to activate the auto off feature 

[dimitrioptimus]

I tried to measure the amp of my flashlight(TF-3T6)with UT-61E,but it cannot measure it,neither it's powering up the flashlight but my $10 DMM is measuring fine & displaying around 2.5amps.
What's the reason ?

[Wytnucls]

Check your 10A fuse, you may have blown it.

[Soertier]

I tried to measure the amp of my flashlight(TF-3T6)with UT-61E,but it cannot measure it,neither it's powering up the flashlight but my $10 DMM is measuring fine & displaying around 2.5amps.
What's the reason ?

Test leads may have high resistance (do not forget this type of flashlights use relatively low voltages and high currents) or you didn't do something right, wrong jacks, shorted the meter,etc.
Owning the UT61E, I would not recommend using the leads which my UT61E came with (Don't know about yours) for high currents at low voltages.

[Monkeh]

Did anyone figured out how to activate the auto off feature 

Have a quick search on the forum..

[T4P]

The leads are pretty good actually.
Just remember to use IPA and clean the tip every now and then in a humid environment

[PedroDaGr8]

 I won a few auctions on ebay from a particular seller. I got 25x 578pF (yep 0.578nF) 1% Silver Mica capacitors, 50x WIMA 0.22uF 250V 10% and 25x 3.6uH inductors for <$18 shipped from the same seller.

Well I decided to push things a little harder . In particular the silver mica 1% were what I was interested in. Particularly because they are low value high precision (relatively) caps and there was a good enough qty that I could test them all and get an acceptable precision in my measurements.

I tested all capacitors two ways: using the test leads (using the Rel function) and using the adapter (using the Rel function). I reset the relative value between each measurement (essential for the test leads, not so much for the adapter). The reported value of 578pF +/- 1% means that the measurements should fall between 0.573nF and 0.584nF.

Now for the results:
The measurement using test leads are listed first while the measurements using the adapter are in parentheses.
#1 - 0.584nF(0.582nf)     #11 - 0.582nF(0.580nF)     #21 - 0.581nF(0.580nF)
#2 - 0.582nF(0.581nF)     #12 - 0.580nF(0.578nF)     #22 - 0.581nF(0.580nF)
#3 - 0.581nF(0.581nF)     #13 - 0.578nF(0.578nF)     #23 - 0.584nF(0.584nF)
#4 - 0.582nF(0.580nF)     #14 - 0.583nF(0.582nF)      #24 - 0.585nF(0.584nF)
#5 - 0.584nF(0.584nF)     #15 - 0.581nF(0.580nF)     #25 - 0.579nF(0.578nF)
#6 - 0.584nF(0.582nF)     #16 - 0.584nF(0.582nF)
#7 - 0.581nF(0.580nF)     #17 - 0.580nF(0.580nF)
#8 - 0.579nF(0.578nF)     #18 - 0.583nF(0.580nF)
#9 - 0.584nF(0.584nF)     #19 - 0.584nF(0.582nF)
#10 - 0.580nF(0.580nF)     #20 - 0.585nF(0.584nF)

Average Value  - 0.582nF(0.58096nF)
Percent Error from Reported Value: 0.692042%(0.512111%)
The results range from 0%-1.0% of the reported value.

This is incredible, the listed accuracy for this range is +/- 3.0%+5 counts. Enough said!

A few things I learned from this. One, as the manual says the adapter is MUCH more reproducible and appears to be a bit more accurate. Using the adapter I measure the same cap 10 times through out the test and every time it returned the same value. Using the test leads it was always +/- 1 count. Second, the adapter works even though you don't plug it into the COM port. One end plugs into the cap,volt,ohm,etc. port the other actually plugs into the mAuA port.

I then tested the 50x 0.22uF WIMA 10% caps, just to see how they do.

I'm not going to bother to list out 50 values. I tested the adapter for the first 10 and there was NO difference between the adapter readings and the test lead readings. Additionally, these are high enough in capacitance that the relative function is not necessary.

Now to see how they did. The average value was 0.221553uF which is an error of only 0.706% from the reported value! Keep in mind this test range is still 3.0%+5 counts accuracy The results have a much higher variation ranging from -5.77%-5.59% of the reported value. That is still well within the +/-10% reported for the caps themselves.

This meter just continues to impress me!

[PedroDaGr8]

Also the meter is sub-$50 again at DinoDirect!

$55.35 is the current price (with free shipping). Add coupon code DEAL10DD to drop it to $49.85 and if you are a Fatwallet member. You can get 5% FWCB. Which makes the final price $47.36. HEHE! Merry X-Mas

[T4P]

UNI-T is probably the only DMM mfr i know so far that provides such a adaptor 

[PedroDaGr8]

UNI-T is probably the only DMM mfr i know so far that provides such a adaptor 

It's kind of funny because I originally though it was more or less useless for our meter. It didn't seem to match our hole configuration. I figured it was mainly for HFE and temp measurements and maybe testing smd parts. Clearly, I should have known otherwise because they would have cut it long ago to save costs. After using it this evening for the low capacitance measurements I have to say it made that job a piece of cake. Using the test leads was a pain in the rear. Constantly re-zeroing...oh crap I moved the leads it now reads -0.002...gotta re-zero again...looks better...move to the capacitor...dang it now it reads 0.001...maybe if I hit REL with my toe while holding the leads (yes that thought actually crossed my mind at one point ).  Some of the measurements using the test leads had me re-zeroing around 4-5 times before I was satisfied the innate capacitance was accounted for.  With the adapter, zero it out, insert cap, let it sit for a second, done. I have a new affinity for that little thing.


After discovering that in the manual and seeing how useful it is I decided to read the rest of the manual. I'm actually discovering a few more interesting/humerous things about the UT61E by reading the manual:

It suggests using the adapter for more accurate high resistance measurements (>1Mohm).

Then there is this odd gem:UT61E:Measuring Audio frequency,if the input voltage is more than 15 volt. the meter will simulate the sound in same frequency. Yes that random period after volt is in the manual as well.

To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings I'm not even sure what this means exactly. I know those words are english but...

Take out the battery when it is using for a long time.

Accuracy is guaranteed for 1 year.  What happens if it falls out of accuracy, lol. Though based on how it is behaving I'd believe it would hold cal for a year.

They keep talking about measuring 1000V but the damn thing is fused for 250V! I really don't get that mess.

They claim around 50pF residual capacitance and I have to say that was pretty close to right. (I think mine was 58pf). Add the adapter and it jumps to 66pF, with test leads it was closer to 80pF (but it varied greatly on how the leads were oriented with each other.

It's funny I keep thinking this meter can't surprise me anymore and it does again and again.

[Monkeh]

They keep talking about measuring 1000V but the damn thing is fused for 250V! I really don't get that mess.

Only a problem for current, and easily fixed.

[PedroDaGr8]

They keep talking about measuring 1000V but the damn thing is fused for 250V! I really don't get that mess.

Only a problem for current, and easily fixed.

Doh, I'm a fool on that one. Thanks for correcting me.

[T4P]

To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings
Not exactly english but they tried their best to translate, i've seen worst manuals from some "top" companies on their low-end products which are clearly some rebadged stuff (Or re-fried sick if you prefer)
Interpreted as : Clean the terminals with a cotton bar with some detergent periodically as dirt or moisture buildup can affect readings ... though i don't agree with the detergent part.

[WhiteFireDragon]

Also the meter is sub-$50 again at DinoDirect!

$55.35 is the current price (with free shipping). Add coupon code DEAL10DD to drop it to $49.85 and if you are a Fatwallet member. You can get 5% FWCB. Which makes the final price $47.36. HEHE! Merry X-Mas

Hey you just posted this yesterday, but price has doubled. It shows as $98.99 from dinodirect. Am I missing something here?

[iloveelectronics]

Also the meter is sub-$50 again at DinoDirect!

$55.35 is the current price (with free shipping). Add coupon code DEAL10DD to drop it to $49.85 and if you are a Fatwallet member. You can get 5% FWCB. Which makes the final price $47.36. HEHE! Merry X-Mas

Hey you just posted this yesterday, but price has doubled. It shows as $98.99 from dinodirect. Am I missing something here?

I see 2 listings there, one for $89.99 and the other 98.99. Anyway, they were probably just clearing out some older stock (with older dates of manufacture) at the very low price and I guess now those are all gone.