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

[ninodeves]

all this morning I have been using my zoyi zt-dq02 and the truth is I like it a lot and it works very well for how cheap it cost me, only €67 although days later they raised it to €88, I have been comparing it with my DEER DE-5000 and the differences are minimal and unnoticeable, it is not a bad meter, of course it is not a professional meter but to know if a capacitor is bad or not it is more than enough and the data it provides are real and good, the resistance measurement is also very good, I have not been able to compare the coils yet, greetings.

[kwass]

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?

I just upgraded from v1.0.5 to v1.0.6 and can confirm that this resolution bug is NOT fixed.

[ninodeves]

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?

I just upgraded from v1.0.5 to v1.0.6 and can confirm that this resolution bug is NOT fixed.

where can I get version 1.0.6, thanks.

[coromonadalix]

read a few pages back and check  i posted the files

[KungFuJosh]

I wanted to try one of these for fun...not gonna happen. 🤦

[coromonadalix]

wuuut   wtf ? i dont know if ordering from Canada and push it to USA would be less expensive ?   

[KungFuJosh]

wuuut   wtf ? i dont know if ordering from Canada and push it to USA would be less expensive ?   

Depends on whether or not there are tariffs from Canada that day. 🤦

[ninodeves]

wuuut   wtf ? i dont know if ordering from Canada and push it to USA would be less expensive ?   

Depends on whether or not there are tariffs from Canada that day. 🤦

What a joke the subject of tariffs is

[ninodeves]

read a few pages back and check  i posted the files

Thanks, I have updated to version 1.0.6 and I don't see any significant changes.

[KungFuJosh]

wuuut   wtf ? i dont know if ordering from Canada and push it to USA would be less expensive ?   

Depends on whether or not there are tariffs from Canada that day. 🤦

What a joke the subject of tariffs is

The joke is the moron making the tariffs, but we don't really need to discuss that here.

[strannic]

This is on all ranges - the value reaches 79999 and then resets to 8000, 9000, etc. That is, this tester has a maximum value of 79999 readings.

[Propretor]

Zoyi ZT-DQ02:
Level 0.6V
Mode   Amp,V   RMS,V                     Frequency,Hz   
R,L,С   0.82      0.570         100, 120
R,L,С   0.86      0.612         1kHz
R,L,С   0.76      0.540         10kHz
R,L,С   0.74      0.524         100kHz

Level 0.3V
Mode   Amp,V           RMS,V                     Frequency,Hz      
R,L,С   0.408      0.292         100, 120
R,L,С   0.424      0.305         1kHz
R,L,С   0.368      0.271         10kHz
R,L,С   0.360      0.261         100kHz

Level  0.1V                  
Mode   Amp,V           RMS,V                     Frequency,Hz      
R,L,С   0.148      0.099         100, 120
R,L,С   0.150      0.102         1kHz
R,L,С   0.130      0.090         10kHz
R,L,С   0.120      0.088         100kHz

[BillyO]

Hm DQ2  can not measure Inuctance lower 1uH

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

Did you not read the specifications before buying it?   

That it cannot measure inductance lower than 1uH is clearly specified.

That it will not properly  measure a 470uF cap at 100kHz is also  clearly specified.  Above 1uF, 1kHz is the highest frequency supported.

RTFM!!! 

[BillyO]

The joke is the moron making the tariffs, but we don't really need to discuss that here.

The moron making the tariffs got spanked by the Chinese and he announced today that he's reduced the tariffs to 30% or so.  I imagine he'll get spanked again when they start selling off their bonds for pennies on the dollar.  What the orange goo-ball of dung does not seem to understand, is that China is the 2nd largest owner of American debt.  They can ruin the US in a single day.  He better also lay off the Japanese.  They own even more than China.

Okay, I'll get off my grandstand..

[KungFuJosh]

Hm DQ2  can not measure Inuctance lower 1uH

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

Did you not read the specifications before buying it?   

That it cannot measure inductance lower than 1uH is clearly specified.

That it will not properly  measure a 470uF cap at 100kHz is also  clearly specified.  Above 1uF, 1kHz is the highest frequency supported.

RTFM!!! 

No offense to anybody, but measuring a 470µF cap at 100kHz shows more reading is needed beyond TFM. Usually, the only time a high value cap like that is measured at 100kHz might be for ESR, but the capacitance value is garbage.

[KungFuJosh]

I didn't have a 470µF next to me, so here's a 1mF cap measured on a Hioki IM3570 with an L2000 kelvin probe.

You can see the measurements above 1kHz are garbage except ESR. You can't expect a $72 meter to perform magic that professional equipment can't do.

[BillyO]

You got to love the negative capacitance though.  It's what makes faster than light travel possible.

[Martin72]

You can't expect a $72 meter to perform magic that professional equipment can't do.

That's the main point.
The circuit topology alone cannot deliver that for so little money; there really are limits.

Then:
In order to be able to check the performance/“credibility” of a meter to some extent, you should use components for measurement for which data sheets are available.
These data sheets usually contain the test specifications, for example, the frequency at which the value was determined.
Then you can see whether your own measuring device comes to the same result.
That's what I would do first.
Then there is the point Josh briefly mentioned: realistic measurement conditions.
When measuring a high-capacity capacitor at high frequencies, you have to be careful about what you see on the display.

[aiekszzz]

Principles of LCR meter measurement.

Operating frequency

During operation, the meter supplies an AC test signal to the test device.
Frequency is one of the main parameters of an alternating current source. Due to the fact that the component parameters differ from the ideal ones and are distributed, as well as due to the influence of distributed parameters on the input contacts, different results can be obtained for the same component with different operating frequency values. Therefore, choosing the right operating frequency is important.

Serial (Ser) and Parallel (Par) connection modes

Selecting an appropriate equivalent mode can improve the measurement result. The serial mode is more suitable for elements with low impedance (<100 ohms), and the parallel mode is more suitable for elements with high impedance (>10 kOhms).
For elements with an impedance between these two values, the equivalent mode does not have much effect on the measurement result.

Capacity measurement:

1. It is advisable to measure a small capacity in Parallel connection and with an increased measurement frequency.

2. It is advisable to measure high capacity in a serial connection (Series) and at a reduced measurement frequency.

Measurement of inductance:

1. It is advisable to measure low inductance in a serial connection (Series) and an increased measurement frequency.

2. It is advisable to measure a large inductance in parallel connection and a lower measurement frequency.

[aiekszzz]

I have an ET432 East Tester and a curiosity-bought ZTDQ 02. What I liked about the ZTDQ 02 is that it saves the parameters after switching off and the calibration is done once for specific probes. The ET432 East Tester needs to be calibrated every time it is turned on. I calibrated the ZTDQ 02 to Kelvin in closed and open mode. I didn't touch the other parameters.
The calibration function is used for open and closed circuits. Calibration reduces the error caused by the parameters of the test line.
Short-circuit calibration reduces the effect of probe resistance when measuring low-resistance components.
Open circuit calibration can reduce the effect of distributed capacitance and resistance between two points of the test line when measuring the parameters of components with high impedance.

These are the measurement accuracy parameters for the East Tester ET432. From this it can be seen that by measuring a large capacity at a frequency of 100kHz on a particular device, the accuracy can jump out in 10-20%.
Why ZOYI did not provide such tables for its product remains a mystery.

[Martin72]

Why ZOYI did not provide such tables for its product remains a mystery.

Want to take three guesses, or is one enough?

[Propretor]

Manual in English.

[aiekszzz]

Why ZOYI did not provide such tables for its product remains a mystery.

Want to take three guesses, or is one enough?

  This is more of a rhetorical question
For 60 bucks, it's a good hobby device, but the wires go straight to the trash.

[aiekszzz]

If you're interested, I can post a comparison of several measurements on ZOYI and ET432.

[Martin72]

Manual in English.

Which also explains why measuring 470µF with 100kHz does not make sense.