Author Topic: UNI-T UT61E Multimeter teardown photos.  (Read 541202 times)

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Offline mariush

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #725 on: May 20, 2014, 05:44:05 pm »
Of course you're doing something wrong. The meter only measures current when you use the 10A jack.

 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #726 on: May 20, 2014, 06:06:49 pm »
In that case why is there a yellow symbol "Hz" under the A range?
 

Offline Wytnucls

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #727 on: May 20, 2014, 06:15:42 pm »
Try the 10A AC selection. If that doesn't work, try the AC mA position, if the current is below 220mA.
The AC voltage selection should also give you frequency and duty cycle.
 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #728 on: May 20, 2014, 06:31:24 pm »
The light uses about 2A. I tried the 10A AC but no success.
 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #729 on: May 20, 2014, 07:59:03 pm »
This is really strange. I'm wondering if I'm doing something wrong...
Is there somebody out there with a UT-61E who could test this?
 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #730 on: May 20, 2014, 08:24:37 pm »
HKJ gave me the answer.
http://budgetlightforum.com/node/8642?page=2#comment-585893
Seems like even though you can display Hz in DC Amp range the meter needs AC.
 

Offline Wytnucls

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #731 on: May 21, 2014, 06:22:56 am »
The book says no DC offset allowed when measuring frequency:
 

Online HKJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #732 on: May 21, 2014, 06:26:10 am »
The book says no DC offset allowed when measuring frequency:

That table is for the frequency (Hz) position. In the above case frequency was measured on the current input, with DC selected.
 

Offline Wytnucls

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #733 on: May 21, 2014, 07:25:09 am »
No, that note covers all frequency selections.
 

Online HKJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #734 on: May 21, 2014, 07:35:19 am »
No, that note covers all frequency selections.

Not as it stands, the frequency is only up to 1kHz when measuring it in the current ranges.
The note "DC electric level is zero" must mean that it only works for AC, not pulsing DC. In the "fast" test I made it was not critical with DC offset, but it needed something below zero to work.
 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #735 on: May 21, 2014, 11:12:52 am »
An other thought:
The manual says:
***
5. Press Hz% to obtain the frequency and duty cycle value.
   Input Amplitude: (DC electric level is zero)
   Input Amplitude:    >rangex30%
   Frequency response:UT61A and B <400Hz
                UT61C , UT61D andUT61E   <1KHz
***
I set the meter to the 10A range. Maybe that my input amplitude needs to be at least 3A (30%) in order to get a reading?
 

Offline multiJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #736 on: May 22, 2014, 09:28:00 am »
Hello all. Is this DMM still good value for a hobbyist at the $50 range, please (mainly for small battery testing and light electronics work). Thank you  :)
 

Online HKJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #737 on: May 22, 2014, 09:31:37 am »
Hello all. Is this DMM still good value for a hobbyist at the $50 range, please (mainly for small battery testing and light electronics work). Thank you  :)

I believe it is, but watch out for the current ranges, the burden voltage is a bit high in some cases.
 

Offline multiJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #738 on: May 22, 2014, 09:49:09 am »
Thank you HKJ. I was wondering if the UT61E is decent for this kind of work:
http://www.lygte-info.dk/info/Measurement%20UK.html


(edit for spelling)
« Last Edit: May 24, 2014, 09:34:30 am by multiJ »
 

Online HKJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #739 on: May 22, 2014, 09:56:45 am »
Thank you HKL. I was wondering if the UT61E is decent for this kind of work:
http://www.lygte-info.dk/info/Measurement%20UK.html

It is, except for some measurements in mA and uA range, where the burden voltage is to high (Using an external resistor can fix that).
The problem ranges are 2200uA and 220mA, i.e. between 0 and 200uA it has very low voltage drop, same with 0 to 20 mA range.
 

Offline multiJ

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #740 on: May 22, 2014, 10:22:26 am »
That is very helpful, much appreciated
 

Offline torr032

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #741 on: August 01, 2014, 04:24:51 pm »
Brand new UT61E, bought on ebay, shipped directly from Shenzen. Markings on  PCB: 150507-9 61E

When measuring clear DC on voltages above about 8 volts, I get this erratic readings on AC range, goes OL and back with beeping when OL is displayed. I have no idea what the problem is. Sorry no sound this is the only camera I got.


https://www.youtube.com/watch?v=9DcmOKxp2Eo&feature=youtu.be


http://postimg.org/image/o3whew8vf/
« Last Edit: August 01, 2014, 04:37:55 pm by torr032 »
 

Offline mariush

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #742 on: August 01, 2014, 04:49:20 pm »
It's normal, the meter is not designed to measure AC voltage when there's DC voltage present as well.

This, plus the rare incorrect display for one reading when it changes ranges are the only "major" issues this multimeter has. The high burden voltage on some ranges (as explained above) I consider minor issue, easily to work around.



 

Offline torr032

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #743 on: August 01, 2014, 05:07:36 pm »
It's normal, the meter is not designed to measure AC voltage when there's DC voltage present as well.

This, plus the rare incorrect display for one reading when it changes ranges are the only "major" issues this multimeter has. The high burden voltage on some ranges (as explained above) I consider minor issue, easily to work around.

I had one bought 2 years ago that was in the same circumstances reading O an AC, wasn't jumping as this one. Can't remember what revision PCB was.
 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #744 on: August 16, 2014, 03:53:15 pm »
My 6F22 9V battery just died, 6 months after buying the meter (I use it a lot).
What is the best battery in this format? I saw http://www.fasttech.com/products/1046603 which is cheap.
I also saw http://www.fasttech.com/products/0/10002905/1812000-soshine-650mah-9v-li-ion-rechargeable-battery which is more expensive but might be a better deal in the long run?
Funny thing is that my smoke detector started beeping a few days ago even though the battery still shows 9.1V open circuit. (Bad design?)
I think I'll use new batteries in the smoke detector and then place them in the multimeter...
 

Offline Monkeh

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #745 on: August 16, 2014, 03:56:18 pm »
If you put a lithium primary cell in you'll probably need a new meter before you need a new battery.
 

Offline lagman

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #746 on: August 16, 2014, 04:17:09 pm »
Thanks!
Locally I'll have a hard time finding a 9V lithium primary... Do you know an online store where I could buy it?
EDIT: I found some on amazon but they are 8-12 euros a piece (11-16USD) :/
« Last Edit: August 16, 2014, 04:21:02 pm by lagman »
 

Offline lagman

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Offline mariush

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #748 on: August 16, 2014, 04:46:47 pm »
Lithium > Alkaline > heavy duty 

Get alkaline, best value for money. Lithium will last longer, but probably not as much as 4-6 alkaline batteries that will cost the same (if you make the total).

Also note that the low battery voltage on ut61e shows up at about 5.5v but the meter itself can operate just fine even under 3v, so the batteries you take out of your meter may still work for a few hours to run a clock or something using very low power, with the 5-5.5v the battery has left.

Lithium 9v batteries  start at about 8.4v and they're completely dead at about 5.4v so you would get almost all of their energy before the meter says low voltage.

For example, you can see in this datasheet http://data.energizer.com/PDFs/la522.pdf  that with 5mA draw (a bit more than what UT61E draws) the battery will last about 800 hours.

To compare, you have here an alkaline battery datasheet: http://data.energizer.com/PDFs/522.pdf  on page 2 you can see that with about 10mA draw, the battery will go down to about 6v in around 70 hours. So you can extrapolate about 150 hours at 5mA and down to 5.5v...
 

Offline Legit-Design

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #749 on: August 16, 2014, 04:49:27 pm »
Thanks!
Locally I'll have a hard time finding a 9V lithium primary... Do you know an online store where I could buy it?
EDIT: I found some on amazon but they are 8-12 euros a piece (11-16USD) :/
Yes, good quality lithium primary batteries cost money. If you don't pay for good quality you might get crap, if you don't get crap you got lucky.
Is this a good idea?
http://www.aliexpress.com/item/1200mAh-Smoke-Alarm-9V-Lithium-Battery-ER9V/1985926539.html
Most likely you will get old stock that is already partially discharged or maybe even faulty, order at your own risk.
 


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