Products > Test Equipment
East Tester ET3502 LCR-Bridge
Martin72:
I will see in about 2 weeks. ;)
mawyatt:
--- 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 ---
Here's something that might help, follow the details on how to improve the fixture.
https://www.eevblog.com/forum/testgear/cheap-smd-lcr-fixture-the-good-bad-and-ugly%21/msg4539458/#msg4539458
We don't have a quality SMD fixture to compare with, but after some rework the cheap ones we have seem OK. Note on one, we had to 3D print another plastic SMD DUT holder as the supplied one was too shallow and allowed smaller SMD DUTs to slip under when the plunger fingers were engaged.
Note that with the ET type LCR Meters reversed Terminal order, the Hcur and Hpot will be connected to the movable plunger rather than the fixed plunger on other LCR Meters. Might become an issue since the fields are higher with the H terminals which will now move with the plunger on ET types, whereas the Lcur and Lpot are close to ground potential and thus the field strength is lower wrt ground potential and should produce less field movement induced errors with other LCR Meters.
Best,
KungFuJosh:
--- Quote from: mawyatt on August 05, 2024, 09:30:25 pm ---https://www.eevblog.com/forum/testgear/cheap-smd-lcr-fixture-the-good-bad-and-ugly!/msg4539458/#msg4539458
--- End quote ---
URLs with an exclamation mark like that won't work. You need to replace the ! with %21:
https://www.eevblog.com/forum/testgear/cheap-smd-lcr-fixture-the-good-bad-and-ugly%21/msg4539458/#msg4539458
Martin72:
Hi,
--- Quote ---Note that with the ET type LCR Meters reversed Terminal order, the Hcur and Hpot will be connected to the movable plunger rather than the fixed plunger on other LCR Meters.
--- End quote ---
I consider this to be negligible with an AC voltage as the measuring voltage.
"Fun" fact:
The Kelvin clip terminal and cables supplied are reversed.
In other words, the red-marked wires are connected to L and vice versa. :P
mawyatt:
--- Quote from: Martin72 on August 05, 2024, 09:49:07 pm ---Hi,
--- Quote ---Note that with the ET type LCR Meters reversed Terminal order, the Hcur and Hpot will be connected to the movable plunger rather than the fixed plunger on other LCR Meters.
--- End quote ---
I consider this to be negligible with an AC voltage as the measuring voltage.
"Fun" fact:
The Kelvin clip terminal and cables supplied are reversed.
In other words, the red-marked wires are connected to L and vice versa. :P
--- End quote ---
Kelvin Clips won't matter, SMD fixtures will!! Even more so with AC at higher frequencies. The modded SMD fixtures we have consistently produce a few fF uncertainties, don't think that would be the case on reversed H and L Terminals.
At one point we were considering an ET type LCR Meter but then discovered the reversed order. Now won't consider them for that reason, even if we needed another Bench LCR Meter (we don't) and with a big discount.
Anyway, of course YMMV.
Best,
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