Multimeter Review / buyers guide: Pt 2

Multimeter Review / buyers guide: Pt 2 - UNI-T UT71D

Рет қаралды 54,039

11 жыл бұрын

Review of the UNI-T UT71D multimeter / DMM - 4000 / 40000 count, 0.025% / 0.05% DC accuracy, internal data logging for 10 000 values, PC data logging.
In this video: PC data logging software, a look inside, battery consumption and low level warning, mains measurement.
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Further discussion and picture here on my forum: mjlorton.com/forum/index.php?t...
If there is enough interest in this multimeter Franky will stock it on his eBay store:
www.99centHobbies.com
Or contact Franky for discount on my forum.
I part 2 of this review I take a look PC data logging software, a look inside, battery consumption and low level warning, mains measurement.
I use both the PentaRef and DMMCheck Plus from Doug at VoltageStandard.com
Details and specs of the UNI-T (Unitrend) UT71D:
www.uni-trend.com/UT71d.html

Пікірлер: 76

@Wytnucls 11 жыл бұрын

This is version 7 of the PCB, with major repositioning of components to accommodate bigger fuses. The current shunt has been modified and the board cut-out is also new.

@gfx2006 11 жыл бұрын

Seeing how the "AC+DC" is labeled next to the DCV position, perhaps you can try pushing the yellow button after selecting DCV and see what happens. And BTW, you have a beautiful daughter!! She's an angel :)

@jwrtiger 11 жыл бұрын

Hi Martin, I give an example of the AC+DC function in my video jwrelectro: "Part 2 of 4 Review Amprobe AM-140-A" at around 8:50. The reason you saw no change is because you are measuring an AC mains voltage which in theory should have no DC component/offset. Nice video!

@mjlorton 11 жыл бұрын

Thanks Dave, I appreciate you feedback.

@mjlorton 11 жыл бұрын

Good question...I hope to post a follow-up to bits I have missed and will included this if I do. I will also try test and feedback here. Cheers.

@mjlorton 11 жыл бұрын

Thanks FT! I will check that AC+DC again and might follow up with a few other bits I missed. Cheers.

@IanScottJohnston 11 жыл бұрын

Gotta love your honesty in your video blogs Martin......well done!

@mjlorton 11 жыл бұрын

Thanks very much for the feedback and post Arne. Cheers, martin.

@mjlorton 11 жыл бұрын

True...hope to pick that up in a follow-up.

@mjlorton 11 жыл бұрын

Thanks for the feedback and correction.

@pitstoppels9769 9 жыл бұрын

Many thanks for the detailed review! I like your good work.

@mjlorton 11 жыл бұрын

Ok, I used a 1mA source and measured the burden voltage / voltage drop in both mA and uA ranges on both meters: UT61E in uA -> 0.62V in mA -> 0.01V UT71D in uA -> 0.49V in mA -> 0.006V

@mjlorton 11 жыл бұрын

Again...thanks for that feedback.

8 жыл бұрын

Dear mjlorton! Thanks for the video.

@delvicgudmundson4482 9 жыл бұрын

Very good review. Thank you for the imformation!

@mjlorton 9 жыл бұрын

Delvic Gudmundson My pleasure.

@garywashington9391 8 жыл бұрын

Good video, fair and honest. Just bought one.

@mjlorton 11 жыл бұрын

Thanks Ian.

@SeanBZA 11 жыл бұрын

First thing to change are those fuses, at least to ceramic versions same size, or bigger ones, nice to have the footprint there. CAT5 multimeter, nice for low energy circuits.

@mjlorton 11 жыл бұрын

Yes...silly me...that character could have been avoided!!! I totally agree with you on the SD for data logging...did mention this to Comtest / Fluke and they said the have now implemented this in their power analyser...but not sure if it will move to any other meters.

@mjlorton 11 жыл бұрын

Thanks for the post.

@mikedemoore6670 7 жыл бұрын

Great review, Thanks you!

@mjlorton 11 жыл бұрын

Not had one in my hands yet so can't say. I'll make a note as a possible future review.

@capleaker3721 11 жыл бұрын

Martin, I do enjoy all the multi meter and o'scope reviews, but also like to see something different test equipment like a EMF tester.

@mjlorton 11 жыл бұрын

Thanks!

@RandyLott 11 жыл бұрын

Great video, Martin! Your little one is adorable :)

@mariushmedias 11 жыл бұрын

Yes, it's possible, watch the first part. You press a button on the meter and it sends all measurements saved in a few seconds burst through the cable.

@dangelep 7 жыл бұрын

Nice review. I like more your reviews than Dave's ( EEVblog ).

@mjlorton 11 жыл бұрын

Hi Dennis...sorry, I don't have a source greater than 20 Mhz. The software does not have the option to go full screen from what I can tell....very odd.

@Wytnucls 11 жыл бұрын

It is not necessary to desolder anything to remove the PCB, Martin. THe metal shrouds will pop out of the jacks with a bit of pressure applied underneath the board. The AC+DC function is best demonstrated with a function generator delivering a square wave with a DC offset. The PTC doesn't protect the Volt range. It protects all the other selections (Ohms, Caps, etc) against overvoltage. Have a look at the circuit schematic.

@Monkeh616 11 жыл бұрын

Just like the UT61E, it has unfilled spark gap positions. Coupled with glass fuses, the UT61E at least came with BS1362 ceramics (yes, only 250VAC rated, but still a hell of a lot better than little glass fuses). But again, like the UT61E, it has component positions for both a spark gap (you can use a MOV here, instead) and better rated fuses (6.3x32 and 10x38mm for the 500mA and 10A fuses respectively). So room to fit appropriate protection if you're inclined to do high energy work with it.

@mariushmedias 11 жыл бұрын

Fuses are replaceable parts. You can put ceramic fuses instead of the glass ones, there's even footprints on the pcb for bigger fuse holders. PTCs can also be put on the board. 2 fuses and some ptcs are much cheaper than $100-200 extra for higher end meters. Even without those modifications, this meter (in or outside its fast measuring mode) hits all your needs. If you want extra safety, the Agilent he compares this meter to might be what you need, but it's not cheap.

@callishandy8133 2 жыл бұрын

I like to add the three PTC by my self. Any idea what type will be perfect and have less leak current ?

@roland349 11 жыл бұрын

many many thanks.Excellent

@sagaertj 10 жыл бұрын

Hi, how fast is the conductivety test (beep) , my Extech DMM is very slow on this, takes a few hundred ms before it starts beeping when shorting the terminals.

@mjlorton 11 жыл бұрын

Coming soon...

@snajperSLO 9 жыл бұрын

Whats the diff UT71D vs UT71E? Does the E have loging?

@ferongr 9 жыл бұрын

I wanted a meter that did AC+DC True RMS and had logging capabilities but my budget was extremely limited. I just bought the UT71D from eBay for 123€ shipped. Not impressed with the protections but I will be using it on ELV levels so I'm not too concerned. Also, I could be lucky and get a revision with proper fuses. Thanks for the very detailed review!

@jon123423 8 жыл бұрын

Did you check the fuses?

@ferongr 8 жыл бұрын

Mine came with glass fuses too. It's been working fine for my needs though this past year and a half

@jon123423 8 жыл бұрын

I think now all UNI-T's multimeter come with ceramic fuses. Any flows?

@callishandy8133 2 жыл бұрын

2022.April.17 = UNI-T UT71 E with production date: 04/2021 My Uni-T UT71E comes with 2 ceramic fuses . (10 Amp from Holley ist very long and thick and a lot of sand volume inside to stop a spark) (500mAmp fuse is the maximum size the PCB connections allowed by the manufacturer) The 2 crocodile cables are not includes. In my country these version is not safe to use (when an beginner connect these on extreeeem high voltage or current because he is not a electric/electronic skilled person) No extra three PTCs are mounted. Additional informations = Sorry my english is not perfect. I am german. And by the way the CD is not included. The warranty card is not from UNI-T as in the video part 1. The UT71E PCB is a little bit different , but quite identical. Ok not really identical.

@DIlic-iz9tx 5 ай бұрын

_I have the same instrument. When I measure the current voltage, it shows 10 V~ more than what the laboratory instrument measured. The voltage in my house is 235 V~, and such a UT shows 245 V~. I don't know if it is possible to calibrate without expensive equipment. Thank you._

@henkybobby6269 3 жыл бұрын

@mjorlton..do you have bios rom for this model..i have error with my 71D

@dennisqwertyuiop 11 жыл бұрын

Great review I am interested in frequency range do you have a source beyond 20 mhz? I work in 200 to 300 mhz like to see what it does there also the display on pc How big is it full screen ? thankyou Dennis from wis.

@Viper81766 11 жыл бұрын

What is your Opinion on the Fluke 88V Automotive Meter ?

@icpart 11 жыл бұрын

Hi Martin. Can you test the voltage drop (burden voltage) or internal resistance of multimeter on current measurement ranges especially in mA range. Because I now looking for multimeter with dataloging capabilities which I will use for low voltage and current measurements. So I wonder about the choice between UT61E or UT71 UNI-T series, but I read somewhere that UT61e has a large voltage drop of about 0.8V which is problem for circuits worked on low power supply voltages.

@popaconstantin4615 10 ай бұрын

Buna ziua ! Știți cumva cum pot repara un multimetru UNI-T 70B LA CARE SA CRAPAT DISPLAY-UL? DE UNDE POT PROCURA DOAR DISPLAYUL.MULTUMESC.🎉

@DoRC 7 жыл бұрын

dangit uni-t a pretty nice meter killed for me by lack of input protection

@mariano.deheza 2 жыл бұрын

Hello Martin! It would be great, if subtitles were available. I understand english, but not 100%. I think that this could add much more views to your videos, with subtitles. I don't know if you can enable it, or what. Kind regards.

@ijs106 4 жыл бұрын

Como pode a uni-t fazer um instrumento tão bom e colocar um fusível tão medílcre?? 01 PTC de proteção 🤒🤒🤒

@gfx2006 11 жыл бұрын

I don't think it's fair to compare multimeter pricing to tablet computes. They are produced (and sold) in massively different volume.

@HeroDragonAge 9 жыл бұрын

Сool review.

@SylwerDragon 11 жыл бұрын

well no thanks :) I did see it on diff. pages and it seems to me it isn't very good at all. even my old Mulimeter Metex had big ceramic fuse..and not that thing :) What i would like to see is good multimeter with dataloging and fast speed. and ofc good voltage protection.i don't want spend few thousands but i want spend some decent money for good multimeter. So Any advise? I did like this dataloging..but general quality wasn't good all.

@DLTX1007 11 жыл бұрын

WOW, seems like a 3chip solution is not a good idea. There's a Holtek LCD driver chip inside, a variant of a MSP430 (In a SOIC or TSSOP small chip) and a main Cyrustek ASIC The UT61E only draws

@BellA-mf1ti 9 жыл бұрын

on the back case it says the exact same thing, no different

@sandratheissen1023 10 жыл бұрын

For me here in Germany its about 160 Euro.......I better safe for a Agilent U1272A. I also have a cheap peachtek and after 6 years the paint of the resistors is falling off and one of the resistors is even breaking? from nothing .

@bkupiec 11 жыл бұрын

It looks like the blue button seems to have a second use for monitoring a 4-20 mA process control loop. You didn't mention that function.

@Monkeh616 11 жыл бұрын

Go on then, go design one of these meters and market it. Give us a shout when it's on sale, yeah?

@Monkeh616 11 жыл бұрын

There's no performance difference between the RS232 cable and the USB cable. The interface is exactly the same, the USB cable simply has the adapter built in.

@antraciet 11 жыл бұрын

34:40 Very lovely :-)

@ijs106 4 жыл бұрын

how can uni-t make such a good instrument and put such a bum fuse ??

@Monkeh616 11 жыл бұрын

At least the battery clip is of the hard variety, rather than the flimsy, soft ones which only ever come off one terminal at a time.

@arcadeuk 11 жыл бұрын

The build quality looks dissapointing. I have just opened up my old UT70D to compare that is significantly better (proper fuses, screw connected input connectors, better soldering, more shielding etc)

@dani777dani 6 жыл бұрын

not logic problem, reference problem