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East Tester ET4510 LCR meter
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Martin72:
ET4410, cap measuring comparing to ST2830 (TH2830):

https://www.eevblog.com/forum/testgear/east-tester-et4410-desktop-lcr-meter/msg4941505/#msg4941505

Next post there is measuring on a "reference".
mawyatt:
Some measurement comparisons are good, some slightly different (outside of specs?), and some not even close (100KHz).

This doesn't convey any type of instrument confidence IMO!!!

Best,
GnomeZA:

--- Quote from: mawyatt on December 13, 2023, 03:10:41 pm ---We utilize "Meters" to measure device and circuit parameters, like voltage, current, capacitance, resistance, inductance and so on, and why we employ various precision Bench Type Lab Grade DMMs and LCR Meters (as well as handhelds DMMs and LCR meters, for less precision GP use).

The Hioki IM3536 is our "In house reference" for LCR use, and also the Tonghui TH2830. These are high quality Bench Lab Grade LCR meters that allow comparison measurements. We have some precision (0.01%) Caddock and Vishay Resistors for reference, but no precision capacitors. However we have stable Polystyrene, Mica, and NP0/C0G types that we've kept measurement records and periodically compare with the Hioki and Tonghui meters. We feel this is necessary even with these quality well known Lab Grade LCR meters, which are also compared with 3 KS34465A, and a DMM6500 (also HP34401A, AG34401A and SDM3065X).

With these ET brand questionable LCR meters, how does one convey confidence in measurements? Precision resistors are available and inexpensive, however reference capacitors that can verify to the "claimed" ET precision levels are not readily available, and likely very expensive.

As a side note, the mentioned ET reversed BNC arrangement when using Fixture based Kelvin Clips like the TH26011 or B&K TL89K1 will reverse the polarity of the internal DC bias as "seen" at the colored and labeled Kelvin clips. So one must remember to reverse the Kelvin connections when using internal DC Bias.

Anyway, these ET LCR meters seem questionable for any serious use, altho as always YMMV.

Best,

--- End quote ---

I think the problems you've spotted could well be down to quality control and may not be intentional or even still present or various scenarios.
That said, and to your point, I have my doubts how much you can trust their quality control, "calibration" and specifications.
Let's just say, I don't think this going to be like Keithley 2000 (or insert good meter here) you buy 2nd hand, and 30 years later and it is still giving good measurements that are pretty damned accurate.

But LCR market doesn't have a well developed middle of the road as far as I can tell.
I've done a lot of digging now and I'll admit it is a lot less bleak to me today than it was a week ago.
But there isn't much information around, unlike multimeters & scopes, for example.

Basically, you either pay enough money to buy a new car or you are stuck with a lot of meh options and trying to make the best of what is around and talking about them here.
Because frankly there isn't a good definitive LCR thread even on eevblog that I could find.
Martin72:
@mawyatt:
At the end of the day, it's no different in principle(circuit) to the TH2830, for example, but why it's completely off at 100khz was the reason why I bought another one.
I wanted to find out and fix it if possible.
But time is short... ;)
nctnico:

--- Quote from: mawyatt on December 13, 2023, 03:34:07 pm ---Some measurement comparisons are good, some slightly different (outside of specs?), and some not even close (100KHz).

--- End quote ---
Pity the results wheren't included in this thread, but measuring tens of uF at 100kHz is asking for trouble so no wonder the results are way off. At 100kHz a 47uF capacitor represents an impedance of 33m Ohm. Good luck trying to measure the amplitude and phase across such a small impedance. When using an LCR meter, it is important to know what the limits of the device are. No matter the price tag.
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