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

[Serg65536]

You're right, I got things mixed up.
MD1 also has this resolution in the lowest range.

MD1 is jumping very much on low impedance measurements. It does NOT have 4 wire contact.

[dmitrkov]

and the ones @dmitrkov used are non inductive .... witch is supposed to be good


@dmitrkov   have you tried with the latest FW version ?

Yes, the description says "Non-Inductive". I haven't updated to version 1.0.8 yet. After the update I will check the calibration and look at the inductance of these resistors. I'll write about the result if you are interested

[Aldo22]

OK, I've ordered one. Not because I'm convinced I need it, but because it was very cheap today. 
53 CHF ($62) total for the ZT-DQ02 with all accessories.
I hate myself... 

[RAPo]

Don't, the reason for living is to experience, and that is exactly what you are doing now.
Keep up the good work. 

I hate myself... 

[KungFuJosh]

OK, I've ordered one. Not because I'm convinced I need it, but because it was very cheap today. 
53 CHF ($62) total for the ZT-DQ02 with all accessories.
I hate myself... 

Why? You're on a website with thousands of people that also experience TEAS. I have several LCR meters, including pro bench meters, that are significantly better than this. The only thing stopping me from buying it is the tariffs. 🤷

[Aldo22]

@RAPo
@KungFuJosh

Thanks guys! I feel better now. 

The Chinese aren't sleeping either, the package is already out of the warehouse. 

[Propretor]

 @dmitrkov, @coromonadalix

[andre3d]

 EE BWL High Precision Resistor 0.1% Low Temperature Coefficient Drift Sampling Non-inductive

[Atlan]

Bifilar winding

[TheDefpom]

I recorded the DQ02 review video yesterday, it works very well for the price, the battery IR tests agreed with my HP 4338B with good accuracy for instance.

I checked it on my resistance standards, GenRad capacitance standards, GenRad decade inductance box, and compared to a couple of my other LCR meters.

I plan to publish the video on the 25th, I still have to edit it yet.

[dmitrkov]

@dmitrkov, @coromonadalix

Well I have already updated the firmware to 1.0.8 and calibrated the positions: 10 mOhm, 100 mOhm, 1 Ohm, 100 kOhm and 10 MOhm with these resistors. I also have smd 0805 resistors of these ratings with 1% and 0,1% accuracy. When measuring these smd resistors with the LCR SMD Test Clip (https://www.aliexpress.com/item/1005002531512011.html), the readings are within tolerance.

Also checked the measurements against ET432 and they are the same

I don't know what else could be affected by calibrating the wirewound resistors . The manual also says: For 10mΩ and 100mΩ standard resistors, it is recommended to use PBV 4-wire resistors . But, considering their price and the problem to buy them - it is already too much....


To create a non-inductive wire-wound resistor, half of the resistance windings are wound in one direction (say clockwise) then the wire is folded back on itself and the rest is then wound in the opposite direction (say anti-clockwise) These two windings are inductive but the two inductances so created "cancel" each other out (from an inductance viewpoint) whilst the resistance is the value determined by the full length of wire. 
https://forum.arduino.cc/t/what-is-a-non-inducting-resistor/436610/6

[Propretor]

@dmitrkov, try to measure the inductance at your calibration resistors, it would be curious...

[svetlov]

hello! the seller on ali has two options ZTDQ02 and ZTDQ01 what is the difference between them?
 

[Aldo22]

hello! the seller on ali has two options ZTDQ02 and ZTDQ01 what is the difference between them?

ZT-DQ02 has additionally "Battery Internal Resistance Measurement".
https://zotektools.com/lcr-tweezers-brigde-tester/

[Aldo22]

New Video:

[TheDefpom]

I published mine 12 hours earlier than planned...

I realised afterwards that I probably should have had the insulating jumper installed the entire time... oh well.

[Aldo22]

Seems to be a new delivery record. Less than 6 days from the time I ordered in Dongguan to my house. 

FW is 1.0.7. Is it worth upgrading to 1.0.8 (and losing the factory calibration)?

Thank you.

[MultiMan]

Thanks for the great review! The meter behaved better than I expected.

I'm an amateur that now at 60 decided to start repair electronics more regularly. In school I was torn between going the engineering/electronics path or the biology/chemistry that I chose as I always was interested in basically everything, so now I'm returning to electronics to try and change things up. Anyway, with that being said, I have a question for the knowledgeable people here:

I ordered a DQ02 from Banggood in May and it only arrived after 6 weeks or something, with Chinese only manual and Firmware 1.05. I don't at this time have any precision resistors or any other high precision standards, so what is my best course of action? Use the meter with 1.05 and avoid the affected ranges (have other multimeters) or maybe update to 1.07 , but now I forgot if that fixes the broken algorithm. I would very much appreciate your input.

[jebem]

Meanwhile checked them on my LCR meter.
These resisters are sold as being non-inductive resistors and probably they are.

Hi jebem

Have you updated the ZT-DQ02 to 1.0.8? I got mine today.
Can you tell me whether the measurement deviations were large after the update (say > 2%) and in which ranges?
I'm ask myself whether I should update from 1.0.7 and whether I should buy these reference resistors at all.
Won't a wire do for 0.01Ω?

Sorry for off-topic. It would fit better here:
https://www.eevblog.com/forum/testgear/new-lcr-meters-zoyi-zt-dq01-and-zoyi-zt-dq02-(march-2025)/msg5958053/#msg5958053

Hi Aldo,

Just checked, my LCR meter shipped with V1.07. I just got it a few days ago and had no chance to evaluate it properly. I have an older Proster BM4070 LCR meter that serves me well, although without the precision offered by the new one.
As a general rule, one should calibrate the meter after each FW update, just in case.
I believe you can go back to v1.07, but a support call to the maker will probably be safer before proceeding with the rollback.

I bought the 0.1% resistors to have a reference to check my meters, especially on the Alientek DM40, and to be able to calibrate testers when needed.
Problem is, as you noted, 0.1% is not precise enough if we really want to have the meter "calibrated" assuming the target equipment is precise and accurate enough to differentiate between a piece of wire and a low value resistor.
AliExpress sells precision resistors where a single one cost more that the whole lot of ten 0.1% resistors I bought.
I accept that 01% is good enough for me, the problem is that I can't be sure that all my 0.1% resistors are within the advertised tolerance.

What is the difference between a 0.01R resistor and a piece of wire?
Well, if the LCR meter is precise/accurate enough it will show the difference.

Different wire materials (leagues) and geometry (section, number of cores) have different resistivity and final resistance per length unit, and it will also impose a unique fingerprint in the form of parasitic inductance and capacitance.

In addition, each meter these days will have its own interpretation of reality, depending on the algorithm in use to "iron out" obvious wrong readings.

As an example, my DQ-02 will give kind of erratic values on low ohm measurements when using a 23 EUR Ziboo Kelvin test leads, while the stock included Kelvin leads will give almost stable readings (only the last digit keeps changing).
The above error varies depending on the used frequency and even changing level will result in reading changes.
See pictures. I believe this is related to the excessive inductance/capacitance of the Zeboo leads that the DQ02 firmware is not prepared to handle.



 

[Atlan]

I don't know if it is appropriate to achieve an accuracy of 0.1% of resistances with a measuring device for 80E (Chinese). When the result will be measured resistances of 5% and 1%. Or should the person in question not have bought a laboratory device for X hundred euros.

[Aldo22]

Thanks jebem! 

Yes, I was just wondering whether I could get by with “home remedies” in these border ranges, where I would also be satisfied with 2-3%, without buying reference resistors.
I mean, just in case the values differ a lot after the update to 1.0.8.
I see that you haven't done the update yet either?

By “home remedy” I simply mean what I have here.
The resistor board should actually be sufficient for 10M, we don't have that many counts.
For 0.1Ω I have a resistor (I don't know the details) and for 0.01Ω I have a wire (see photos attached).
This is certainly not perfect, but is it good enough in case it becomes necessary?

Do we actually have to calibrate separately for the 4-wire Kelvin clips?
At what frequency? Does it do this automatically?

[mawyatt]

Josh created a nice PCB with various SMD RLC components that can be probed with Kelvin Clips, might be worth a look.

Best

[chukin]

OK, I've ordered one. Not because I'm convinced I need it, but because it was very cheap today. 
53 CHF ($62) total for the ZT-DQ02 with all accessories.
I hate myself... 

Sali Aldo, it's nice to share the self-flagellation.... I looked up your seller and bought the same one for even cheaper than you did.  I don't blame just you...it was defpom too - his video made it irresistable for the price.

Let's see if it gets to Switzerland as quickly as your's did.

Cheers

Peter

[KungFuJosh]

If anybody wants my V5 LCR Test PCB fully populated (and tested), send me a DQ02, and I'll send the test PCB to you. 😉 I'm not gonna buy one of these while there's still stupid tariffs on it.

[BillyO]

If anybody wants my V5 LCR Test PCB fully populated (and tested), send me a DQ02, and I'll send the test PCB to you. 😉 I'm not gonna buy one of these while there's still stupid tariffs on it.

Just get them to send it to you and claim it's "cellular communications equipment" which is exempt from the tariffs.  Why?  Because of Trump Mobile, of course.  Which, despite the the wonderfully honest and darling Trump family's claims that Trump Mobile is "all American", is having their trash phones made in China.  Just some fun facts.  You get to pay tariffs, they don't.  Nice.