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East Tester ET3502 LCR-Bridge

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w.v.s.:
I think it is basically described in 2.4.10 with the defaults in [].

Martin72:
I have tested a few more commands, most of them work well, the Ethernet interface works albeit very rudimentary - Somehow East Tester reminds me of Rigol...
Good hardware, good ideas, but the software then....
For now, it's time to focus on the actual features of the ET35.
There are many things to adjust, cable length is just one of them.
You can also make this component-specific and save/call it up, under these circumstances I believe that the device can definitely achieve the 0.05% basic accuracy.
But how to test, I don't have such components here...
I think I'll limit myself to values that are known and then compare them.

mawyatt:

--- Quote from: Martin72 on August 04, 2024, 08:29:01 pm ---I have tested a few more commands, most of them work well, the Ethernet interface works albeit very rudimentary - Somehow East Tester reminds me of Rigol...
Good hardware, good ideas, but the software then....
For now, it's time to focus on the actual features of the ET35.
There are many things to adjust, cable length is just one of them.
You can also make this component-specific and save/call it up, under these circumstances I believe that the device can definitely achieve the 0.05% basic accuracy.
But how to test, I don't have such components here...
I think I'll limit myself to values that are known and then compare them.

--- End quote ---

Think you have a TH2830 available, this could be a good reference to use. Would consider forgoing the Kelvin Clips and use the Direct Junction Box types for the Leaded and SMD type components. Might consider something like discussed here:

https://www.eevblog.com/forum/testgear/sensitive-lcr-meter-measurements/

For reference components consider quality leaded Polystyrene, Polypropylene, Mica Capacitors, with some C0G SMD types. For DC or very low frequency using the Kelvin Clips for leaded precision resistors should be acceptable, and you can also use your precision DMM to verify results.

Inductors are another story tho, and we don't place much faith in any typical inductors we have where precision is considered. Precision reference inductors may be available tho, but likely expensive.

If you consider the actual LCR measurement taking place with an inductor, it's the same as for a capacitor. The DUT Complex Voltage and Current are measured, then the Complex Impedance is computed. The only difference is the Impedance Angle is + for Inductance and - for Capacitance, then the test frequency is taken into account to display the Inductance/Capacitance Value. So unless the LCR is misbehaving the impedance levels measured, computed and displayed should be similar in magnitude but opposite in phase for Inductors and Capacitors. Sometimes meters display negative Capacitance for Inductance and visa-versa as the component goes thru resonance, or the wrong parameter is selected.

Anyway, you should be able to get some good components for reference measurements at a reasonable $. If you decide to use the mentioned direct connected "boxes" for various DUT types, you should use the same "box" for the reference measurement on the TH2830 and then on your ET35, that should help reduce another "variable uncertainty" in your evaluations.

Best,

Martin72:
Hi,

SMD Test Fixure Aliexpress

SMD Test Fixture Sourcetronic

I've looked at it three times, I don't see any difference....

KungFuJosh:

--- Quote from: Martin72 on August 05, 2024, 08:38:23 pm ---Hi,

SMD Test Fixure Aliexpress

SMD Test Fixture Sourcetronic

I've looked at it three times, I don't see any difference....

--- End quote ---

The generic ones on Ali are okay with some extra work like tightening fasters internally, and maybe needing to shorten wires. They also often don't send you what's pictured, which is why I got my generic one for under $20. 😉

The DUT holders are also different and effect how things actually fit between the pins. Not easy to compare in photos, especially if one of the photos is a lie.

I'm not saying not to get one from Ali, just be aware you'd be lucky if you receive what you hope to.

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