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

[andre3d]

ZOYI DQ02 bug ?

https://www.bilibili.com/video/BV1JfLczdEnu/?spm_id_from=333.337.search-card.all.click

[indman]

ZOYI DQ02 bug ?

This is an even more sad video than the one that we were shown before. Especially when the secondary parameters D are compared in various containers.

[Propretor]

That's weird. Very contradictory opinions about the device. It is confusing that there is no mention and support on the official website.

[coromonadalix]

yeah same here

if people do ask Zoyi,  or tell them problems on the lcr's   maybe tey'll be more inclined to do fw updates faster  ?  i did ask  ...

[Propretor]

yeah same here
if people do ask Zoyi,  or tell them problems on the lcr's   maybe tey'll be more inclined to do fw updates faster  ?  i did ask  ...

I emailed them too, but never got a response. No answer about the site or firmware.

[Propretor]

To me, the Zoyi hardware circuit looks very similar to a Russian LCR meter.

What do you mean? I own the NV-19 measuring tweezers and they are very good!!!
https://www.rlc-esr.ru/index.php/ru/pintset-nv19
The developer of the tweezers is not a very friendly and outgoing person, but his tweezers are excellent! I don't mean beauty, but functionality and features.

[indman]

What do you mean? I own the NV-19 measuring tweezers and they are very good!!!
The developer of the tweezers is not a very friendly and outgoing person, but his tweezers are excellent! I don't mean beauty, but functionality and features.

There is no need to compare NV-19 with these new Chinese developments. NV-19's schematic and software have been improved and improved over the years, and ZT-DQ01 and ZT-DQ02 are still very raw products that Zoyi has been releasing like hot cakes lately.It's good if they listen to user feedback and establish customer feedback, but unfortunately this has not been observed so far.

[Propretor]

There is no need to compare NV-19 with these new Chinese developments.

I didn't compare them. Moreover, I am well aware of the history of the creation of these tweezers. I was only surprised by the phrase of our Chinese friend.
By the way you have your own very good developer - the creator of M63 Stepan Mironyuk. Also an excellent in-circuit ESR meter. I have it in my “equipment park” and use it often. Stability and accuracy of readings are excellent! A unique product, though with a “primitive” look. But it's like the joke: “Do you want a cab or a ride?”

[Propretor]

Zoyi ZT-DQ01 and ZT-DQ02 circuits are copied from a tweezers LCR.

Which Russian LCR tweezers are you referring to? Apart from the one named above (NV-19) I don't know any other Russian measuring tweezers. And where did you get this information from?

[ass20]

Hm DQ2  can not measure Inuctance lower 1uH

And i If you measure capacitor 470uF and morу on 100kHz it is show bad values..

[Propretor]

And i If you measure capacitor 470uF and morу on 100kHz it is show bad values..

For capacitance measurements of 470µF, 120Hz is used to measure capacitance, and 100kHz is used to measure ESR.

[Propretor]

What is HRM-10? Russian measuring tweezers? I only know Fnirsi HRM-10.

[ass20]

And i If you measure capacitor 470uF and morу on 100kHz it is show bad values..

For capacitance measurements of 470µF, 120Hz is used to measure capacitance, and 100kHz is used to measure ESR.

I check 470uF on DE5000 and ZT-DQ2  DE 5000  show OL (said i can not mesure) But DQ2 show any  wrong Values... Why it is do not show OL . do not know

[Propretor]

There are 2 approaches by manufacturers - either display the OL or at least show something, albeit roughly. Whichever is closer.

[coromonadalix]

Zoyi ZT-DQ01 and ZT-DQ02 circuits are copied from a tweezers LCR.

Which Russian LCR tweezers are you referring to? Apart from the one named above (NV-19) I don't know any other Russian measuring tweezers. And where did you get this information from?

I thought you all knew, but it seems you don't.
Please see the attached picture,I saw a lot of people commenting, this is one of them, I randomly found it

oh okay   they say Zoyi copied the  battery impedance measurements,  sure  if the design is somewhat open 

[ninodeves]

I bought a Zoyi ZT-DQ02 and I tried to open it, but I couldn't. I removed the four screws, but it still doesn't work and seems stuck. Can anyone give me a solution? I'd like to see the status of the internal battery. Thanks.

[indman]

There are 2 approaches by manufacturers - either display the OL or at least show something, albeit roughly. Whichever is closer.

When the "OL" is on display, the manufacturer is playing fair and that's the right thing to do. When something approximate is shown on the display, it almost always misleads the user, especially a beginner.What's the point of 5 decimal places if the last 2 or 3 of them represent a random number generator?
It's better to tell the truth and show "OL" than to cheat by showing a lot of numbers on the display.

[coromonadalix]

I bought a Zoyi ZT-DQ02 and I tried to open it, but I couldn't. I removed the four screws, but it still doesn't work and seems stuck. Can anyone give me a solution? I'd like to see the status of the internal battery. Thanks.

you have case snaps/locks around middle length, very hard to pop them out when brand new / never opened

[coromonadalix]

for the price,  i did  buy  knowing since it's new on the market,  it could be a dud, a non finished,  nor a polished product 

that's why i rely on others equipment(s)  too loll   

[Propretor]

There are 2 approaches by manufacturers - either display the OL or at least show something, albeit roughly. Whichever is closer.

When the "OL" is on display, the manufacturer is playing fair and that's the right thing to do. When something approximate is shown on the display, it almost always misleads the user, especially a beginner.What's the point of 5 decimal places if the last 2 or 3 of them represent a random number generator?
It's better to tell the truth and show "OL" than to cheat by showing a lot of numbers on the display.

That is your opinion and you are entitled to it. But the developer of the NV-19 tweezers, for example, thinks otherwise. I like the precision, too. But, sometimes, I'd rather have the device show 50000µF +-2000µF than OL.

[indman]

Propretor,We're talking about a few different concepts.The measuring range of the device, the resolution, the measurement error and the accuracy of measurements are slightly different concepts and meanings, aren't they? You should understand this well and distinguish between them, since you are no longer a beginner. The developer of the NV-19 tweezers understands this well.

[Propretor]

I bought a Zoyi ZT-DQ02 and I tried to open it, but I couldn't. I removed the four screws, but it still doesn't work and seems stuck. Can anyone give me a solution? I'd like to see the status of the internal battery. Thanks.

you have case snaps/locks around middle length, very hard to pop them out when brand new / never opened

Can the latches be broken?

[Propretor]

Propretor,We're talking about a few different concepts.The measuring range of the device, the resolution, the error and the accuracy of measurements are slightly different concepts and meanings, aren't they? You should understand this well and distinguish between them, since you are no longer a beginner. The developer of the NV-19 tweezers understands this well.

Nevertheless...

[indman]

Frankly speaking, I don't know about NV-19.
But in China, there are too many LCR testers that look like tweezers.And they all appeared in the last 1 or 2 years.
I heard that they all come from a Russian LCR tweezers.

You can copy everything you want, but it does not mean that the copy will work just like the original!
This can be well seen on the example of a well -known project of transistors testers. How many copies of this project have already been issued by Chinese friends based on more modern and high -speed controllers, but not one of them has not even come close to stable work as the original on Atmega AVR. In addition, in Chinese copies of inexpensive tweezers, circuitry is greatly simplified.

[ninodeves]

I bought a Zoyi ZT-DQ02 and I tried to open it, but I couldn't. I removed the four screws, but it still doesn't work and seems stuck. Can anyone give me a solution? I'd like to see the status of the internal battery. Thanks.

you have case snaps/locks around middle length, very hard to pop them out when brand new / never opened

Thank you very much. I thought it was difficult to open. I'll try more carefully. I just want to make sure the internal battery is in good condition. Regards.