New UNI-T LCR meter? UT622  - Page 1
Forum section: electronics / testgear

author: Wytnucls
author_rank: Super Contributor
timestamp: March 10, 2021, 07:52:53 pm
content: Has anyone seen this meter before?https://www.banggood.com/UNI-T-UT622A-Handheld-LCR-Digital-Bridge-Frequency-Inductance-Resistance-Capacitance-Tester-Multimeter-Ohmmeter-p-1805614.html?utm_source=googleshopping&utm_medium=cpc_bgs&utm_content=xibei&utm_campaign=xibei-ssc-za-all-newcustom-nca95-0507&createTmp=1&ad_id=434436833469&gclid=Cj0KCQiA-aGCBhCwARIsAHDl5x9P8pAbOZJKAx0fFCd4GfUe5oTxJCxyEX6xyH9UqhLLUgoTV-g95fUaAon7EALw_wcB&DCC=US&currency=USD&cur_warehouse=CN

author: coromonadalix
author_rank: Super Contributor
timestamp: March 11, 2021, 02:29:49 am
content: Be careful the ads are kinda misleading, the 622a is not an 100khz lcr ...

author: Messtechniker
author_rank: Frequent Contributor
timestamp: March 11, 2021, 04:01:41 pm
content: Had a look at the manual. USB with virtual COM Port and SCPI commands.Should be great for integration with HKJs Test Controller proggie.

author: Wytnucls
author_rank: Super Contributor
timestamp: March 11, 2021, 05:55:25 pm
content: Not to be confused with this UNI.T. Although also quite easy on the eye:

author: ResistorRob
author_rank: Regular Contributor
timestamp: March 11, 2021, 06:31:08 pm
content: I bought one these a while ago... after I think I first learned of it on this forum.The A version doesn't have 100khz, the C version does and the E version adds DC resistance.According the specs online the A version has the ability to read higher capacitance. I don't know if that is true or a typo.Anyway, the E version is $55 more just to read DC resistance. That seems insane to me. So it really seems like the C model will be the best fit for most people.The one I bought I have only used twice, but even with that limited use I already love it. Nice display and worked flawlessly.For $175 it is about $80 than the infamous DER 5000. The UNI-T is a little more accurate, but to be honest I just liked that it looked like a real piece of test equipment and the DER has a bit of a toy like appearance. The DER would have met all my needs, but it was worth it to me to pay a little extra for the nicer build quality.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 11, 2021, 11:09:49 pm
content: would be nice to have a teardown, seems an hantek brother ??

author: skander36
author_rank: Frequent Contributor
timestamp: April 19, 2021, 08:49:28 pm
content: Quote from: coromonadalix on March 11, 2021, 11:09:49 pmI can attach some pictures.They are not taken in very good conditions but you can make an opinion about what's inside.STM32F04 and Altera MAX II FPGA. A hole bucket of mux-demux 4051, 4053 , opamps and a trimpot. All this to be just as good as DE5000 which has only 2 IC's.Some manual soldering on bigger components and contacts.

author: skander36
author_rank: Frequent Contributor
timestamp: April 19, 2021, 08:57:09 pm
content: Overall is a good LCR meter, display is a little dark but it has a good contrast.Battery does not seem to last too much.

author: thm_w
author_rank: Super Contributor
timestamp: April 19, 2021, 11:38:49 pm
content: User manual:https://www.uni-trend.com/uploadfile/2020/1202/20201202042856516.pdfNotable spec (UNI-T vs Hantek):99mF vs 20mF max99H vs 2000H max0.1/0.3/1.0V vs 0.3/0.6V test voltage100/120/1k/10k/100k vs 100/120/400/1k/4k/10k/40k/50k/75k/100k frequencyBoth have resolution down to 1fF/1nH.Their accuracy equation is not very easy to compare to theHantek.But it looks like claimed best case is a lot lower, 0.1% vs 0.4%

author: ZhuraYuk
author_rank: Regular Contributor
timestamp: December 13, 2023, 12:35:48 pm
content: I see no differences in hardware with A version in the attachment. I wonder if hack is possible by flashing STM32 firmware or with some SCPI commands like with Hantek 1832C.The design seems to be completely original and new, I like it a lot, it even have CPLD.Before, on cheap CLR market there was only two reference designs:1. Using two chip solution like Der EE DE-50002. Using Hantek 1832/ET432 design with STM32 and simple analog frontend.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: December 13, 2023, 03:42:23 pm
content: Got the UT-622E and made a first definition file (coming soon) for "Test controller".Like it.

author: ZhuraYuk
author_rank: Regular Contributor
timestamp: December 21, 2023, 05:02:43 pm
content: Here is image of UT622Einternals. Can someone see any differences ?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 21, 2023, 05:17:47 pm
content: i would not be surprised they use fw changes and get the same hardware

author: ru_tash
author_rank: Regular Contributor
timestamp: December 22, 2023, 02:04:13 pm
content: Quote from: Messtechniker on December 13, 2023, 03:42:23 pmcan it measure low value inductance? let say less than 1microH?readings are stable and repeatable?

author: MathWizard
author_rank: Super Contributor
timestamp: December 22, 2023, 07:29:17 pm
content: It look's like there's way more going on inside that UNI-T than my MSxxxx LCR meter. But mine goes to 100kHz and has Kelvin probes, and can use batteries or a power pack. I'm sure it was under $150US.100kHz is not very high considering how many SMPS are around. So why can't they even go that high ?

author: Messtechniker
author_rank: Frequent Contributor
timestamp: December 23, 2023, 08:39:21 am
content: The UT622C and UT622E come with Kelvin clips and can do 100 kHz.The UT622A does not come with Kelvin clips and can only do 10 kHz.Just doing some inductance stabiliy measurements on a 3.3 uH inductor.Currently reading 3.403 uH with the last digit being stable.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: December 23, 2023, 09:06:24 am
content: Further measurements on the 3.3 uH indictor:

author: ZhuraYuk
author_rank: Regular Contributor
timestamp: February 03, 2024, 06:08:59 pm
content: So I tried to read STM32 firmware with my cheap ST Link V2 copy via SWD and failed, the error is the same - chip is read protected, however I was able to see the Option Bytes and it says that chip is only write protected and can be read.So, does anyone have good programmer with JTAG? Maybe it will success reading the firmware and posting here? Below I attached JTAG pinouts for the motherboard.

author: shapirus
author_rank: Super Contributor
timestamp: March 26, 2024, 05:04:30 pm
content: Is UT622E still a good value at $270 minus the $40 discount with the currently active Aliexpress anniversary sale (as long as there's something else in the cart to help it make a total of $299 before discount)? That'll mean $230 for the meter, including shipping.I don't exactly require a(nother) LCR meter, as I already have a YR1035 for milliohms and Shannon tweezers ST42 for LCR measurements, but: a) a sale is a suitable time to satisfy GAS; b) I think it'd be nice to have a second LCR meter in addition to the ST42 to serve as a sanity check reference: if both meters show the same readings, then most likely both are fine, but if they do not, then you'll have a nice excuse to buy yet another one to check which of the two is off.The new meter must be able to do everything the ST42 can do (including voltage output below the diode threshold, and that includes Schottky diodes too -- so must have 0.1 Vrms or less mode) and more, considering the price and size. Just how much more, I'm not really sure. Is 4-wire measurement beneficial for inductance and capacitance? If yes, then it must be so for lower ranges, like about sub-uH and sub-10 pF -- how good will it be at these?I did read the Hantek 1832/1833C thread... Wasn't impressed for some reason. It just seems lacking in the overall quality, including customer support. Someone mentioned the UT622E, and it looks like a better product.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: March 26, 2024, 09:53:29 pm
content: Been using it a bit lately.What I am missing occasionally is DC capacitance measurementfor comparison with the specs printed on those lytics.

author: shapirus
author_rank: Super Contributor
timestamp: March 26, 2024, 10:01:46 pm
content: Quote from: Messtechniker on March 26, 2024, 09:53:29 pmHow does it feel overall? Quality, UI, attention to details, the impression that some thought was put into designing it (or otherwise), basically user experience in general.Quote from: Messtechniker on March 26, 2024, 09:53:29 pmDo any of the same class devices have it though?I'd imagine it's not really a big deal, because that's what a regular DMM can do, can't it?

author: shapirus
author_rank: Super Contributor
timestamp: March 26, 2024, 10:20:33 pm
content: There's also that East Tester ET432 (or the ET43x series in general). Has a dedicated electrolytic cap mode, which isn't DC, but applying a correct polarity bias. Interesting.Looks like the same platform as the Hantek, but more functions. I guess I need to do my research on these as well...update: I guess it's a "no thanks":https://www.eevblog.com/forum/testgear/et432-lcr-meter-wild-results-range-function

author: indman
author_rank: Super Contributor
timestamp: March 27, 2024, 06:45:07 am
content: Quote from: shapirus on March 26, 2024, 05:04:30 pmI'm of the same opinion, I agree with you. Hantek 1832/1833C, ET43x - no,low quality products with outdated platform!UT622C,E - yes, higher quality products with a progressive platform and an excellent set of options needed for analysis.If I had a choice now, I would buy only UT!

author: Messtechniker
author_rank: Frequent Contributor
timestamp: March 27, 2024, 06:57:38 am
content: Quote from: shapirus on March 26, 2024, 10:01:46 pmOverall feel is nice. Nothing to grumble about from my side.Can't say much about the supplied software since I with the help of HKJ,I made a definition file for "Test Controller".The UT622E is not supplied with a protection case. Had to buy a suitable one separately.For DC Capacitance I use my Voltcraft VC940. My Keysight 34465A isusable only up to around 1000 uF, which is a pity. I do use capacitorsover 1000 uF on a regular basis. This is for me the only weakspot of the 34665A I have found in around 10 years of use.

author: shapirus
author_rank: Super Contributor
timestamp: March 27, 2024, 10:31:01 am
content: Quote from: Messtechniker on March 27, 2024, 06:57:38 amHow good (or bad) is it at measuring low values (milliohms in AC and DC), single-digit pF and uH and below?Strangely, there are no reviews on youtube. So any real experience is much appreciated.p.s. thatmini-USB socket though...

author: Messtechniker
author_rank: Frequent Contributor
timestamp: March 27, 2024, 10:59:58 am
content: Planning to do some pF measurements over Easter. Will report.What's so bad about the mini-USB socket at the side? Except for the factthat the plug sticks out.

author: shapirus
author_rank: Super Contributor
timestamp: March 27, 2024, 11:10:49 am
content: Quote from: Messtechniker on March 27, 2024, 10:59:58 amIt's pretty much obsolete, and the micro is going obsolete too. It was normal to see mini-USB charging/data ports in 2005, maybe even in 2010, but not in 2024.I struggle to find any mini-USB cable around me (but I had some -- I'd need to search hard), almost everything uses type-C these days.

author: indman
author_rank: Super Contributor
timestamp: March 27, 2024, 11:26:18 am
content: Quote from: shapirus on March 27, 2024, 11:10:49 amYou are very careful when choosing a device and rightly so! But there must be at least one flaw in the device, otherwise it becomes uninteresting.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: March 28, 2024, 06:21:41 am
content: OK. Maybe it's time to get one of those 10 or 12 piece adaptor sets.I happen to have - besides an older 7 piece one without USB C - a good USB cable collection.Yes, we do eat a lot of those Haribo fruit gums.....

author: HPIB
author_rank: Newbie
timestamp: September 30, 2024, 04:03:37 pm
content: I have a problem with PC Win10 64bit connection of my UT622C unit via supplied USB cable. It always show "Bus Error02" message on the UT622 screen. I have downloaded software from UNI website, have tried supplied CD, nothing work. When run Device Manager, there is a screen with LAN, USB and RS232 with UT622C + baud rate, but after I click "open LCR" it cycles on synchronizing...and nothing happened. Any ideas what is wrong? Charging battery via the same USB cable is working. Thank you.

author: Lomax
author_rank: Frequent Contributor
timestamp: April 13, 2025, 10:18:14 am
content: Quote from: Messtechniker on March 28, 2024, 06:21:41 amHey, I love that cable storage solution - very neat,andtasty! I might have to steal the idea...

author: RAPo
author_rank: Super Contributor
timestamp: April 13, 2025, 10:50:20 am
content: Indeed, I'm doing that right now ;-)Quote from: Lomax on April 13, 2025, 10:18:14 am

author: Lomax
author_rank: Frequent Contributor
timestamp: April 13, 2025, 02:41:53 pm
content: Quote from: ResistorRob on March 11, 2021, 06:31:08 pmForgive my ignorance, what does "DC resistance" mean in this context? I thought they all (including DER EE DE-5000) measured resistance, and ESR as well, but this seems to refer to some other parameter?

author: RAPo
author_rank: Super Contributor
timestamp: April 13, 2025, 03:38:49 pm
content: DCR stands for direct current resistance, which measures the resistance of a component or circuit when a 0 Hz DC signal passes through it.Seehere

author: Lomax
author_rank: Frequent Contributor
timestamp: April 13, 2025, 07:42:21 pm
content: Sure, but how is that any different to what a normal multimeter does?

author: shapirus
author_rank: Super Contributor
timestamp: April 13, 2025, 08:20:04 pm
content: Quote from: Lomax on April 13, 2025, 07:42:21 pmBy using 4-wire measurement method, I guess.

author: hfleming
author_rank: Regular Contributor
timestamp: April 14, 2025, 11:03:41 am
content: Quote from: Lomax on April 13, 2025, 07:42:21 pmIt acts as a milli-ohm meter. Can measure esistance from 0.01milli Ohm. Normal Multimeters struugles to read anything lower than around 1 Ohm.

author: Lomax
author_rank: Frequent Contributor
timestamp: April 14, 2025, 12:02:33 pm
content: Quote from: shapirus on April 13, 2025, 08:20:04 pmQuote from: hfleming on April 14, 2025, 11:03:41 amThanks guys, that makes perfect sense. Even my bench meter cannot do this (10mΩ resolution), so now I understand why it might be a useful feature.