Products > Test Equipment
Hioki IM3570 LCR & Impedance Analyzer
mawyatt:
Yep it's pretty good all around :-+
If you sit back and think about what's happening with the fixture and DUT, especially wrt the current path from Hcur to Lcur and how the DUT voltage is sensed at Hpot and Lpot which happens to be on the DUT. Maybe sketch things out electrically, then it does make sense it performs rather well across the range ;)
We have some solid copper 0.55mm sheet cut to about 2512 size we use for short, which seems to work OK. What do you use for a short and open?
Best
KungFuJosh:
--- Quote from: mawyatt on September 30, 2024, 05:01:43 pm ---We have some solid copper 0.55mm sheet cut to about 2512 size we use for short, which seems to work OK. What do you use for a short and open?
--- End quote ---
I used a smashed piece of 12AWG copper wire for short, but I'm ordering CSS2H-2512C-000E and WSL251200000ZEA9 to test for short cal.
I don't use anything for open cal since the pads are always the same distance from each other.
KungFuJosh:
I got the 0Ω resistors I mentioned above, and had some fun with 1mΩ and a 0.5mΩ resistors. 1mΩ was easily repeatable. 0.5mΩ was repeatable, but annoying to seat correctly. I wound up putting it in upside-down, and it made contact better. I guess the bottom wasn't very flat.
Jumper resistor shown in the photo:
Thanks,
Josh
KungFuJosh:
This was interesting. Today I used the IM3570 to test some guitar pickups I recently acquired. Pickup nerds usually like to see Ls @ 1kHz, Rdc, Cp @ 100kHz, Q @ 3kHz.
mawyatt:
--- Quote from: KungFuJosh on October 04, 2024, 05:36:36 pm ---I got the 0Ω resistors I mentioned above, and had some fun with 1mΩ and a 0.5mΩ resistors. 1mΩ was easily repeatable. 0.5mΩ was repeatable, but annoying to seat correctly. I wound up putting it in upside-down, and it made contact better. I guess the bottom wasn't very flat.
Jumper resistor shown in the photo:
Thanks,
Josh
--- End quote ---
We've seen this a few times as well, flipping the SMD DUT over gives better results sometimes. DUT surface planarity is likely the cause.
Nice close up image of the Bourns Zero Ohm Shunt in the fixture :-+
I like the slight bowed nature of this shunt and how we made our zero ohm shunt earlier from Cu sheet. This places the force of the plunger alone the edge of the shunt and give a slight "scrubbing" action as the plunger slight force pushes down and slightly spreads the shunt.
Have you done any repeatability testing with this shunt? Like make a Zero Ω Cal, make some DUT low Ω Resistors, then return a few hours later and repeat checking the shunt for readings and the low Ω Resistors, and maybe perform this over a couple days?
If the PCB Gold plating holds up (it should as this is used in quality connector contact surfaces) seems like a good option, we were going to do this way back but never got around to a PCB reorder, too many "other" things got in the way.
Anyway, nice work :-+
Best
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