What setups do you use with the VNA for single component measurements?
Simple, a piece of semi-rigid coax with soldered on pogo pins. This works for PCB coupons and small caps as well. I run these measurements somewhere down low, like 10MHz.
Do you mean you get a piece of semi ridged coax, take a bite out of it to expose the inner structure but do not break the ground plane, so it looks like a bath tub shape, remove some of the inner structure carefully, then solder in pogo pins? That is one of the best ideas I have seen if thats what you mean. Can you take a picture anyway I am curious?
Do you do any kind of series impedance or anything like that? If you watch Davejones most recent teardown video of the impedance analyzer they show different circuit that should be used with different impedances. As its wired I think a VNA will only give accurate information around 50 ohms impedance unless you modify the test setup
And the De-5000 is good I have been using it for a long time but its 100KHz maximum leaves something to be desired for me. Also the alligator kelvin clip is poor quality (I had to resolder and the actual aligator clip was loose and the jaws did not close right) and the tweezers I found were not the friendliest, they have too much play and not enough grip in my opinion, if you compare them to real tweezers meant for picking stuff up. I would like to make them structurally stiffer so you can't torsionally distort them so easily, and I would like to see maybe some texturing on the grabber end. Small SMD parts are kind of annoying to probe, the contact pressure requires some skill.. if you give them too much pressure they will torque on you and the part goes missing some where on the floor.
I have thought to modify real tweezers for LCR capability lol, so I can use nice swanstrom/lindstrom/etc ones.
I find the trick to using the DE-5000 tweezers is to grip them very close to the end. Like 1cm above the probes, then you have marginally acceptable control. If I try to use them like my quality tweezers, gripping them about 1/2 way down, they are super fail. They still feel like they are made of fucking spaghetti though. You need to really watch your thumb.