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Small Kelvin clips that actually grab?

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pope:

--- Quote from: TopQuark on April 08, 2024, 03:09:01 pm ---
--- Quote from: pope on April 08, 2024, 02:58:13 pm ---Thanks for the recommendation Topquark!

In fact, I'm looking for BNC ends so I can use them with my RLC meter. I measure L of small coils like the ones shown below and it's a bitch to do it with the normal kelvin clips  ;D




--- End quote ---

Well if you already have a LCR meter, then you'll need the BNC type for sure.

But playing the devil's advocate here, LCR tweezers are definitely the easiest way to go for winding transformers. Bonus points for ease of taking it to the drill press / grinder when grinding the air gap iteratively for flyback coupled inductors.  ;D

--- End quote ---

Well, yeah I thought about tweezers but I need to use the first pin as a reference and then measure the L from pin1 to every other pin. I don't see it happening without a fair amount of swearing... Plus I need to have free hands to go through the menus, etc...

TopQuark:

--- Quote from: pope on April 08, 2024, 03:20:20 pm ---Well, yeah I thought about tweezers but I need to use the first pin as a reference and then measure the L from pin1 to every other pin. I don't see it happening without a fair amount of swearing... Plus I need to have free hands to go through the menus, etc...

--- End quote ---

Well I was trained to use chopsticks before learning how to walk, so as not to starve. So the fact that it is a pair of tweezers but not two metal sticks as probes is an absolute luxury.  :popcorn:

But for real, it is actually quite easy to test different coil pairs with tweezers, but YMMV.  ::)

pope:

--- Quote from: TopQuark on April 08, 2024, 03:27:30 pm ---
--- Quote from: pope on April 08, 2024, 03:20:20 pm ---Well, yeah I thought about tweezers but I need to use the first pin as a reference and then measure the L from pin1 to every other pin. I don't see it happening without a fair amount of swearing... Plus I need to have free hands to go through the menus, etc...

--- End quote ---

Well I was trained to use chopsticks before learning how to walk, so as not to starve. So the fact that it is a pair of tweezers but not two metal sticks as probes is an absolute luxury.  :popcorn:

But for real, it is actually quite easy to test different coil pairs with tweezers, but YMMV.  ::)

--- End quote ---

Haha, OK fair enough

shabaz:
Some of the AliExpress Kelvin clips I've tried seem pretty good, not super-robust if accidentally crushed e.g. stepped on! but definitely usable, although there's no real cable strain relief, but that's easy to work around with things like heat-shrink, etc. The ends are not heavily grooved, only lightly, but they stay on unless the cable is tugged. Some LCR meters come with such Kelvin clips, and they work fine.

In terms of physical size, the Mueller Electric BU-75K Kelvin clips are smaller, but more expensive : (
They come with screws (for using with small ring terminals I guess), but it's possible to quickly solder instead (the plastic will melt a bit if not careful), if that's preferred. Main downside is that the screws are still required, because they secure the terminals in place. My solution was to remove the screws, solder the wires, and then put the screws back. The bulge where the wire insulator passes over the screw heads, provides a nice grippy area to hold the clips. That explanation was probably not very good, but hopefully the photo makes it clearer.

The contact ends are pretty flat, not really grooved much, but can stay clipped if no tugging on the leads.

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