Hi!
I have a number of LCR meters, but none are actually calibrated unfortunately. I'm working on that myself too.
However, if someone has a calibrated instrument who can characterise some SMD resistors and capacitors, I have made a design for 4-wire Kelvin BNC references that fit into a standard Takachi enclosure that can be DIY'd.
They replicate the
42030A 4-Terminal Pair Standard Resistor Set and I have also made a short and open (The open simply has no component installed, the short has a chunk of copper in place of a resistor).
So far I have made a complete set of resistance standards that I have measured on my 34461A multimeter (far more accurate than any LCR meter), next I plan to design and construct some air-core capacitors, but there's no reason my PCB's can't be used with SMD capacitors too.
See below for photos and the gerbers. (I haven't finished labeling mine, but you get the idea).
For each standard you'll need (besides your resistor):
1x Lid PCB
1x Internal PCB
1x Takachi TD4-9-3N enclosure
4x Male panel mount BNC's (Cut the locking ring off two of them)
2x 3D printed levers
4x M3.5 screws
For the resistors, I used these:
(Any resistor with as low a tolerance and as low a temperature coefficient as your wallet allows will work, as long as it meets or exceeds the original spec of the 42030A set)
0.001R - Y41880R00100D9R
0.01R - Y44870R01000B9R
0.1R - Y44870R10000B9R
1.0R - CPF1206B1R0E1
10R - RNCF1206AKT10R0
100R - TNPU1206100RAZEN00
1K - TNPU12061K00AWEN00
10K - TNPU120610K0AWEN00
100K - TNPU1206100KAZEN00
I also figured out the internal wiring of the 04284-65007 Interface Box that may or may not be needed.
I added the diagram below. This can be made from some BNC connectors and levers, a Takachi T 10-4-7 enclosure, and a PCB lid (I have a couple spares I can give away for free, while they last).