New LCR meters, Zoyi ZT-DQ01 and ZT-DQ02 (March 2025)

[andre3d]

It may be there AT32F403AVGT7 LQFP100 (in ZT-702S).

[coromonadalix]

seems to fit  #55 posted picture

most of the supply and ground lines, and the osc pins   could be our suspect    thks


as for scpi tests, you can install rhode schwartz visa, they have tester 32 and tester 64 tools to communicate / send command

[gehka3]

And this device arrived to me, in full maximum configuration
On the pleasant side - firmware version 106 was already in the device

I checked it on in-circuit measurements, manually setting the element type, voltage level, frequency, measurement speed
I used adapted bridge tweezers
What can I say - the application is limited for such a purpose, at least in my configurations, but overall a satisfactory rating
Capacitors (SMD ceramics) in PWM strapping - shows quite adequately, in the feedback of power circuits - here are the problems, changing the settings has little effect
Resistors - depending on the circuit and the presence of other elements

Maybe they will improve a little with the release of new firmware?

[coromonadalix]

received  post #35   leads from ali express  works very well,   finger / pcb thickness are ok


@gheka  serial parallel mode do help,  but they are not absolute,  it really depend of what you have in your circuit

because on my de5000  i did ended up with some kinda self oscillating circuit, i simply removed the part and tested outside, 

the biais voltage is limited,  not to damage parts  but sometimes it is not enough

well see over time ?  ... i do hope  the company is hearing our thoughts and comments

[gehka3]

Similarly, on this device I sometimes observe self-excitation, with tweezers and on the original complete cords
Someday I will analyze the circuit and perhaps it will be possible to improve the stability

[indman]

Many people have already received this device, but I have not yet seen any competent review or comparison of readings with other well-known LCR meters?
Can I trust the readings of this product or as I wrote above I should wait until ZT-DQ03(4) is released?

[coromonadalix]

you can  wait  or buy  products who are on the market way longer than this one,  sure i did bought it  knowing that

de-5000 is a basic 2 chip lcr, many others on the same design, and you have many others on the market  ... choice is your's,  some are proven okay and don't have known bugs, but pricey

i did try 10mF caps yesterday too, the last lcr digit do wobble a tiny bit, but i get expected values, tested with 0.035% precision resistors and others, and other type of caps (non precision)  so far, it fit the bill,  i did not test in circuit serial or parallel mode, i'm more the type who remove parts to do better tests

the fw has or may contains errors or else, over time it may get better if Zoyi do updates and hear all users comments, they seems to some extent

i dont have better lcr, bench types   etc ... i can not do better compare, others may do ...


you'll have to wait or be a guinea pig testing it and see ?  keep in mind that's a new product.

[indman]

coromonadalix
Thank you, I already have a ZOYI ZT-703S as a guinea pig. 
I just like the ZT-703S form factor and its large, clear display.
If I were sure that the ZT-DQ02 copes with the task of measuring LCR no worse than the DE-5000, I would buy it now. But I'm not sure about that at all.
By the term copes no worse, I mean not only reliable measurements of the main parameters of the LCR, but also secondary parameters, which are sometimes no less important than the main ones.Therefore, we will wait for a full review of this model.

[gehka3]

Maybe this information will be useful
I looked at the signal with an oscilloscope in the capacitor measurement mode, on the bridge tweezers, at different voltage levels and frequencies


100 kHz 0.1v, 0.3v and 0.6v respectively, a running surge is observed at voltage values ​​of 0.1v and 0.3v, at a voltage of 0.6v the sine is pure
The same behavior at other frequencies
Not critical for measurements

I checked it on a product with a short circuit on an element in the power supply circuit - you can localize the section according to readings in thousandths of an Ohm

[bffargo]

Too many springs at the bottom, causing the plastic to deform easily

Wasn't one of the tear down videos (on the ZT-70xS series) saying that they used a protected cell instead of plain cell and that added extra length to the cell causing it to cram the spring tightly.

[Serg65536]

DQ01 is a 80 000 counts device.
It's on device renders, but not mentioned in the manual.

Ranges with full 5 decimal digits available (up to 80 000 counts):
1.0000-8.0000 Ohm (below 1 Ohm it's limited to 0.1 mOhm resolution)
10.000-80.000 Ohm
100.00-800.00 Ohm
1.0000-8.0000 kOhm
10000-80000 kOhm
100.00-800.00 kOhm
Eg.: above 8 at the first position we loose 1 digit of resolution. So 7.9999 Ohm jumps to 8.001 Ohm.

0.800-0.999 MOhms 3 digits!!! (uppercase "M" stands for mega Ohms, not milli Ohms)
This is some FW glitch! It should NOT be this way!

1.000-7.999 MOhm 4 digits
8.00-9.99 MOhms 3 digits!!!
above 10.00 MOhm 4 digits again. WHY!!!?? the accuracy is horrible, much worse than below 1 MOhm...

I have DQ01 fw 105.

[FixyMixy]

0.800-0.999 MOhms 3 digits!!! (uppercase "M" stands for mega Ohms, not milli Ohms)

This is a horrible resolution! From almost 5 digit device it degrades to 3 digits in the middle of measurement range!

I hope zoyi fix this!

[Serg65536]

On the pleasant side - firmware version 106 was already in the device

Can anybody with fw v106 confirm 3 digit resolution from 800 kOhm to 1 MOhm and from 8 MOhm to 10?

[FixyMixy]

scpi command may be found in FW update file v1.06

Please, share the 106 firmware, I can't find it anywhere!

[Atlan]

https://www.eevblog.com/forum/testgear/new-lcr-meters-zoyi-zt-dq01-and-zoyi-zt-dq02-(march-2025)/50/

[coromonadalix]

scpi command may be found in FW update file v1.06

Please, share the 106 firmware, I can't find it anywhere!

attached

for the DQ02  but  it would be nice to know if it fits on a DQ01  ?? surely there must be some mcu id / model id somewhere

In the FW upgrade  the  lcr appears as a storage drive, you drop the fw in it ...

[Serg65536]

for the DQ02  but  it would be nice to know if it fits on a DQ01  ?? surely there must be some mcu id / model id somewhere

It's NOT RECOMMENDED to upgrade DQ01 with the DQ02 firmware, because it does not check hardware before flashing the firmware.

I've just upgraded my DQ01 with the DQ02 firmware. It fixed the TOL% function, but added battery test mode to the "LCRZ" button. There is no battery calibration menu entry in the settings. I guess there should be calibration data in the flash to access the missing menu.

So now I'm at risk of having my device malfunction with future upgrades or existing software issues linked to the absence of battery testing circuitry.

[indman]

So now I'm at risk of having my device malfunction with future upgrades or existing software issues linked to the absence of battery testing circuitry.

So what prevents you from returning the firmware for DQ01, since it is also available via the link that was given to you earlier Atlan?

[Atlan]

Write to zotek, let him send you the firmware for dq1

[coromonadalix]

this is supposed to be for the dq01

version 1.0.5   i downgraded my DQ02 to a DQ01  and reversed it back  ... works ok   calibration  i dont know  seem fine.

I think @Serg65536   you can put back this one

And people seems nervous about theses lcrs   

they are new and buggy,  pls wait to buy them  or live with their bug's  until Zoyi iron them out 

i asked for FW,  silence for now ...

[Serg65536]

New video from zoyi https://youtu.be/4kmUZNEwCLI

[indman]

New video from zoyi https://youtu.be/4kmUZNEwCLI

Thanks, but this is a sad video. Despite the resolution of 80,000, I don't see any stability in the results on the display, even close.
So it looks like a random number generator in the last digits.So far, this device is not worth the money that is being asked for it. Just don't convince me that you don't have to wait for a quality product for $50-60. Everyone has their own ideas about value.We are waiting for the DQ03-4 version.

[andre3d]

Zotek ZOYI ZT-DQ02 review

[Serg65536]

Thanks, but this is a sad video. Despite the resolution of 80,000, I don't see any stability in the results on the display, even close.

It's stable on almost all ranges. One last count bounces +-1 sometimes.
I can't agree with a point that it is not stable!

Few tips for stability:
- disconnect leads and use the build in socket;
- use shielded leads;
- make sure all 4 terminals are connected to the part, but NOT to each other.
- don't touch the part under measurement;
- use slow measurement speed setting, wait a couple of measurements to complete;
- read the tolerance table from the manual, don't use the device outside specified range. Though it show some values, but they are bouncy and unreliable.

It's not industrial grade device, use it in low EMI environment.

[coromonadalix]

the best handheld would be the old  BK 885 886  or Motech variants  .... they had an dds (frequency synthesizer) ic in them  ....

but as written   i think the mcu does a lot, as many designs, many lcr's are 20k counts  some 40k counts  etc ...  this one goes the furthest

as stability concerned ...  i see only the last digit flicking once in a while, if i use the low speed measurements, it is more stable, i use the newly bought kelvin fixture posted here, not the included ones (banana plugs)

not i myself would say it's a good design


even with an Sencore LC102  or the De5000    just being near it,  can affect it,   clips quality  and other factors ...

IE:  the Sencore is very peculiar for its test cable, RG62b  nothing else, if not, the open or short test will absolutely fail

some bench meters have tests fixtures for lots of $  just to be sure it's good when you go less than 1% precision ... 

as for the video   i think you need to put the blank fr4 pcb in the kelvin slots, to be sure it wont interfere with the banana plugs