East Tester ET4410&ET4510 Desktop LCR Meter

[pizzigri]

I wouldn't risk that, I think it would be preferable to simply desolder the mcu from the front pcb and do all testing with a “cloned” chip that n which to experiment….

[ton4eff]

My ET4410 is not showing right resistance above ~15K.  Compared with my DMM and other LCR meter. Showing 99.25K instead of 100.12K - far away from 0.2% declared accuracy. Is there a known medicine for this behavior? A calibration procedure or similar, like in XJW01?

[w.v.s.]

My ET4410 is not showing right resistance above ~15K.  Compared with my DMM and other LCR meter. Showing 99.25K instead of 100.12K - far away from 0.2% declared accuracy. Is there a known medicine for this behavior? A calibration procedure or similar, like in XJW01?

Did you try the DCR mode?
Did you use the calibration function with your probes with some warm-up-time?

[ton4eff]

Yes, it's even worse in DCR mode. Warmed and calibrated to short and open before measuring. Also tried different cables. Everything below ~15K is spot on. Measured also bigger resistor 470K, showing 8.5K lower than XJW01... 2.2Mohm is OK.

[indman]

My ET4410 is not showing right resistance above ~15K.  Compared with my DMM and other LCR meter. Showing 99.25K instead of 100.12K - far away from 0.2% declared accuracy. Is there a known medicine for this behavior? A calibration procedure or similar, like in XJW01?

Your XJW01 measured the resistance in Rp and ET4410 in Rs mode. What will your ET4410 show in Rp mode?

[ton4eff]

Tried to change P/S mode in ET4410 - no difference at all. Couldn't find any calibration procedure for this one.       Some more pictures:

[Martin72]

Compared with my DMM and other LCR meter. Showing 99.25K instead of 100.12K - far away from 0.2% declared accuracy.

A few notes on this:
Strictly speaking, you don't know the resistance value until you measure it with a calibrated device.
Then:
What kind of resistance is it?
What is the tolerance?
This also plays a role, along with the tolerances of the measuring devices.
If two of three devices show a similar result, and the third deviates, it does not necessarily mean that the third one is wrong.
That has to be determined first.

[indman]

Мартин 72 ,XJW01 and Brymen869 are devices that can be trusted. More doubts are precisely causing ET4410 readings.

[indman]

ton4eff
I think it will be useful for you to read this article about ET4410. She is in Russian language, but I think that with the translator you will understand its meaning.
https://www.drive2.ru/b/698648106182381206/

[Martin72]

XJW01 and Brymen869 are devices that can be trusted.

I only trust things that have been calibrated, that's the nature of my job.
My Brymen 869s has therefore been calibrated externally.
To the point:

I took some resistor out of the box and measured it once with the calibrated 6.5 digit SDM3065X, so it's trustworthy.
Then I measured the same resistor with the ET4410.
Furthermore, with a BM869s (98.33kOhm) and a ST42 (not calibrated, 98.24kOhm).
See pictures for results.
Due to the high basic accuracy of the SDM3065X, this can be taken as a “reference”.
Strictly speaking, that doesn't count either, because to make a comparison you have to create the same conditions.
But we are at home now, so it's okay.

[indman]

But we are at home now, so it's okay.

You really have everything and I'm glad for you and your devices. But not everything is in order with ET4410 ton4eff and I hinted to him a possible reason for this behavior of the device.

[ton4eff]

OK, I measured the same resistor also with BM867 and Richmeters RM102. The BM867 is spot on the same as BM869, RM102 is off by 0.1K. Now the score is 4x1 against ET4410. I read the article in Russian, wish I did it before the purchase. I'm going to try the only hint I fount so far about the calibration procedure of the ET4410 (earlier in this tread), pressing the SET button+power on. Ordering some multi-turn trimmers now...  In the mean time, as mentioned in the article I have to disassemble and check how it is in it's guts... And need to learn some Chinese obviously...

[ton4eff]

I guess they never bothered to calibrate the unit before selling. It's not the first time I experience this with cheap Chinese stuff... Did anyone ever tried the hidden menu procedure before? As far as I understand there is no need to check all different values, only some of them should be enough? But which ones? To remind you that the readings are not everywhere wrong... There are 10 points: 2.05ohm, 6.81ohm, 25.5ohm, 174ohm, 47.5K, 15K, 4.64K, 1,4K + open and short. I intend to make these with multi-turn trimmer and check how if it will work. Any suggestions?

[indman]

I think it's a little premature for you to be calibrating. Is it better to check the quality of soldering, as well as the quality of components installed in the circuit?

[ton4eff]

I think it's a little premature for you to be calibrating. Is it better to check the quality of soldering, as well as the quality of components installed in the circuit?

Of course. That's the first thing to do, thanks. By the way, I even understood the scratched words in the article... 

[Martin72]

Now the score is 4x1 against ET4410.

OK, that is conspicuous, though.

There are 10 points: 2.05ohm, 6.81ohm, 25.5ohm, 174ohm, 47.5K, 15K, 4.64K, 1,4K + open and short. I intend to make these with multi-turn trimmer and check how if it will work.

I would try to buy the resistors with at least 0.1% tolerance individually; they don't cost much.
Trimmers are too inaccurate, or if you must, then I would get several 25-turn trimmers with different value ranges.

[Furna]

[...] as mentioned in the article I have to disassemble and check how it is in it's guts... And need to learn some Chinese obviously...

Could you please take some pictures of your device's "guts" and share?
No need to learn Chinese

[ton4eff]

...then I would get several 25-turn trimmers with different value ranges.

I already did it, these days I will open it and check the insides...

[ton4eff]

...

Could you please take some pictures of your device's "guts" and share?
No need to learn Chinese

Opened the unit, everything looks good, just some flux around the TH parts, nothing criminal. Cleaned it anyway and measured the PS voltages (also checked for unfiltered noise) at the check points with the oscilloscope... Everything is in order.

[ton4eff]

Some more pictures:

[ton4eff]

So, I'm waiting for the resistors to arrive and try to perform the hidden calibration procedure.

[Martin72]

Inspired by the last posts, I have now ordered some 0.1% resistors.
10, 100, 499, 1k, 10k, 100k and 1M.
Converted to the individual values, the resistors may lie in a correspondingly narrow range:

9.99....10.01 Ohm
99.9....100.1 Ohm
498.501....499.499 Ohm
0.999...1.001 kOhm
9.99....10.01 kOhm
99.9...100.1 kOhm
0.999...1.001 MOhm

Let's see what my measuring devices will measure, including the ET4410 in DCR mode.

Regarding the hidden calibration mode:
It is not “hidden” for no reason, you are changing the basic calibration of the device.
AFAIK, East Tester recommends references, R, C, and L for this.
References are tolerances that are significantly lower than the device tolerance, which should be obvious.
What is still reasonably affordable for R is a fortune for C and L.
And that brings me to an interesting point:
You criticized the lack of accuracy in the R measurement - but what about capacitors and coils? Did you measure that too?

And finally, one more thing regarding the basic accuracy of 0.2%:
As with all LCR meters, including much more expensive ones, it is very accurate.
Beyond that, it quickly becomes “less accurate”.
To stay in the “safe” range when measuring, you should take the nomogram into account.

[ton4eff]

The 100K 0.1% resistor (the one that gives vast deviation from 0.2% declared accuracy according to the ET4410's accuracy table) is from the calibration set of XJW01. Also the others with lower nomination, where ET4410 shows no deviation. I'm just a hobbyist, if I had the money for calibrating equipment I would never buy a cheap Chinese LCR meter. I'm using it mainly to measure capacitors from 1 to 100pF range, where I didn't notice any major discrepancies so far, otherwise I would make a comparison, as I did when I noticed the problem with the resistors... But that's a good point, I will take a look before I start to mess with the calibration procedure for the resistors. Also, since the discrepancy is only within the ~60K to ~1M range, I would gladly make the calibration only for this range, but I don't know which one it is from the 10 points in the hidden menu... So I'm planning to start from the middle and see how it will go further... Any suggestions are welcomed.

[ton4eff]

I couldn't make ti to work, after the calibration (it makes 2 passes for all frequencies except for 1.4K) it says (google translate) it's calibrated. Then I press exit, and nothing changes, it shows absolutely the same as before the calibration... Tried with all resistors, except the mysterious "standard inductor", which only god knows what it is...   

[Martin72]

Hi,
All the ET4410s I had were fine.
You may have got a faulty unit, I would take advantage of the warranty.
Where did you buy it?