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Cheap SMD LCR Fixture, the Good, Bad and Ugly

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mawyatt:
Also should mention, when doing the "Open Cal", use something to space the fixture plungers the same distant apart as they will experience when engaged with the DUT. We just use something that keeps the Lever Arm at the proper spacing, a pencil works!!

Best,

Kean:

--- Quote from: mawyatt on December 21, 2023, 04:42:38 pm ---Also should mention, when doing the "Open Cal", use something to space the fixture plungers the same distant apart as they will experience when engaged with the DUT. We just use something that keeps the Lever Arm at the proper spacing, a pencil works!!

--- End quote ---

I was just about to write this myself.  But a pencil???  :-//

KungFuJosh:

--- Quote from: hpw on December 21, 2023, 10:06:34 am ---So have this one now  |O

--- End quote ---

Can you post a photo? How many retainer arms does it have? 2 or 4?

hpw:

--- Quote from: mawyatt on December 21, 2023, 03:47:53 pm ---That depends on how well you've configured your SMD fixture & setup. You need to make all those ground connections and make sure you have a stable mechanical as well as electrical environment. ....

Best repeatable results are with direct LCR connection, external coaxial cables add uncertainty, so keep them short, ....

Anyway, the key message if one wishes repeatable measurements, then a stable mechanical and electrical environment is paramount ;)

--- End quote ---

Yes, did some mechanical work, not at the best and now after open & close calibration things looks any better. Bingo!

Now the height of the two mechanical connections seams to be a bit off, as I had to open those parts.

Attached my copper work, so all grounding should now covered in once :D

Yes, the cables could be shorten, as not RG178 = silver conductor, current multi strand copper.

Thank you for your help

hp

KungFuJosh:
Interesting! You don't usually see the 4 retainer clip version for that price.

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