New UNI-T LCR meter? UT622

[Wytnucls]

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

[coromonadalix]

Be careful the ads are kinda misleading,  the 622a  is not an 100khz lcr ...

[Messtechniker]

Had a look at the manual. USB with virtual COM Port and SCPI commands.
Should be great for integration with HKJs Test Controller proggie.

[Wytnucls]

Not to be confused with this UNI.T. Although also quite easy on the eye:

[ResistorRob]

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. 

[coromonadalix]

would be nice to have a teardown, seems an hantek brother ??

[skander36]

would be nice to have a teardown, seems an hantek brother ??

I 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.

[skander36]

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.

[thm_w]

User manual: https://www.uni-trend.com/uploadfile/2020/1202/20201202042856516.pdf

Notable spec (UNI-T vs Hantek):
99mF vs 20mF max
99H vs 2000H max
0.1/0.3/1.0V vs 0.3/0.6V test voltage
100/120/1k/10k/100k vs  100/120/400/1k/4k/10k/40k/50k/75k/100k frequency

Both have resolution down to 1fF/1nH.

Their accuracy equation is not very easy to compare to the Hantek.
But it looks like claimed best case is a lot lower, 0.1% vs 0.4%

[ZhuraYuk]

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-5000
2. Using Hantek 1832/ET432 design with STM32 and simple analog frontend.

[Messtechniker]

Got the UT-622E and made a first definition file (coming soon) for "Test controller".
Like it.

[ZhuraYuk]

Here is image of UT622E internals. Can someone see any differences ?

[coromonadalix]

i would not be surprised they use   fw changes and get the same hardware

[ru_tash]

Got the UT-622E and made a first definition file (coming soon) for "Test controller".
Like it.

can it measure low value inductance? let say less than 1microH?
readings are stable and repeatable?

[MathWizard]

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 ?

[Messtechniker]

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.

[Messtechniker]

Further measurements on the 3.3 uH indictor:

[ZhuraYuk]

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.

[shapirus]

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.

[Messtechniker]

Been using it a bit lately.
What I am missing occasionally is DC capacitance measurement
for comparison with the specs printed on those lytics.

[shapirus]

Been using it a bit lately.

How 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.

What I am missing occasionally is DC capacitance measurement
for comparison with the specs printed on those lytics.

Do 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?

[shapirus]

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

[indman]

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.

I'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!

[Messtechniker]

Been using it a bit lately.

How 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.

What I am missing occasionally is DC capacitance measurement
for comparison with the specs printed on those lytics.

Do 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?

Overall 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 is
usable only up to around 1000 uF, which is a pity. I do use capacitors
over 1000 uF on a regular basis. This is for me the only weak
spot of the 34665A I have found in around 10 years of use.

[shapirus]

Overall feel is nice. Nothing to grumble about from my side.

How 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. that mini-USB socket though...