Products > Test Equipment
Hioki IM3570 LCR & Impedance Analyzer
KungFuJosh:
--- Quote from: Martin72 on September 28, 2024, 11:40:41 pm ---
--- Quote ---Measure at 300kHz in case somebody wants to compare.
--- End quote ---
To really compare it, I would need exactly your resistor and your test fixture. 8)
--- End quote ---
Well, those two resistors are in the box with your PCB, so... 😉
mawyatt:
Results look spot on, how is the repeatability?
Did you get a gold plated PCB, or rough up the contact surface?
Your results verify what we believed with this Split-Kelvin Technique when properly utilized and applied can produce excellent results down in the milli-Ω impedance levels and not just at DC :-+
Best,
mawyatt:
--- Quote from: Martin72 on September 28, 2024, 11:40:41 pm ---
--- Quote ---Measure at 300kHz in case somebody wants to compare.
--- End quote ---
To really compare it, I would need exactly your resistor and your test fixture. 8)
--- End quote ---
This Split-Kelvin Technique removes a major part of the measurement uncertainty with the fixture and DUT contact parameters if applied properly as Josh has demonstrated and we've mentioned earlier during the development.
Allowing better understanding of the DUT details and not contaminated by the fixture/contact artifacts at milli-Ω impedance levels was the goal of this undertaking which apparently has been achieved.
One is somewhat reliant on the precision DUT to "verify" any result, with quality precision SMD components utilized one can glean details with reasonable fidelity without the need for the same actual fixture and same SMD. These 2512 precision resistors utilized are an excellent resource for precision milli-Ω SMD DUT references for low Z references, and not expensive.
Same goes for high Z measurements, where one can utilize either the Split-Kelvin or Standard type SMD fixtures, here the precision C0G/NP0 SMD capacitors are an excellent low cost DUT SMD reference for low capacitance values.
Your Tonghui ST meter with the Split-Kelvin Fixture should produce results similar to what has been presented, not sure how the ET will behave, pay attention to the reversed meter terminals, probably won't matter with this fixture tho.
Best,
KungFuJosh:
--- Quote from: mawyatt on September 29, 2024, 02:15:15 pm ---Results look spot on, how is the repeatability?
Did you get a gold plated PCB, or rough up the contact surface?
Your results verify what we believed with this Split-Kelvin Technique when properly utilized and applied can produce excellent results down in the milli-Ω impedance levels and not just at DC :-+
--- End quote ---
No issues with repeatability.
Yes, I usually get gold plated PCBs unless the cost is crazy. Here I figured it would be beneficial. Total cost was $20 for 5 PCBs including the slow shipping, so I was okay with it. 😉
I think the split design on this is great. The only issue is making sure the DUT contacts all 4 pads well, which requires paying good attention when inserting the DUT. For these low Z parts, I tested continuity on all 4 pads before reinstalling the fixture on the LCR to confirm the DUT was seated well.
Thank you for sharing the PCB design!
Thanks,
Josh
mawyatt:
--- Quote from: KungFuJosh on September 29, 2024, 05:20:17 pm ---
--- Quote from: mawyatt on September 29, 2024, 02:15:15 pm ---Results look spot on, how is the repeatability?
Did you get a gold plated PCB, or rough up the contact surface?
Your results verify what we believed with this Split-Kelvin Technique when properly utilized and applied can produce excellent results down in the milli-Ω impedance levels and not just at DC :-+
--- End quote ---
No issues with repeatability.
Yes, I usually get gold plated PCBs unless the cost is crazy. Here I figured it would be beneficial. Total cost was $20 for 5 PCBs including the slow shipping, so I was okay with it. 😉
I think the split design on this is great. The only issue is making sure the DUT contacts all 4 pads well, which requires paying good attention when inserting the DUT. For these low Z parts, I tested continuity on all 4 pads before reinstalling the fixture on the LCR to confirm the DUT was seated well.
Thank you for sharing the PCB design!
Thanks,
Josh
--- End quote ---
Repeatability was key in the development, we couldn't get good results with low Z SMDs before this custom fixture, even the Standard SMD fixtures weren't very good.
That's really good, $20 for 5 gold plated custom PCBs with shipping!!! Did the PCBs come from JLCPCB (where ours are from)?
Glad you could use the design, wish others would note the advantage of this technique, it's not like it's expensive.
Best,
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