I'm not paying a cal service for old multimeters for hobbyist use.
Well, than why would you pay for somebody's calibrator just to check stash of your 4.5d meters
Heck, it's cheaper just to buy new meter of that level, than get setup for a calibration
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Who would organize these voltnut gatherings?
Interested parties organize themselves. At least I want to believe that, as I know that happened before, being on such calibration "party" last year, when I calibrated both of my K2002's and stash of references. Even though cost of such (due to airplane fares from TW to USA) was close to sending meters to Keithley/Fluke for calibration, it was manyfold much more fun to play with gear, instead of getting just expensive piece of paper with numbers. Would I do it again? Heck yes, TBD next year!
Is there really an EEVblog forum member willing to share his high end equipment?
That depends too. Usually hardcore voltnuts are fond of their gear, and are happy to show off a bit.
I'd be happy to accept visitor for few days to hangout, calibrate some meter, play with the references and chat about ppm-hunts over the cup of tea/beer/something else.
. But that's unlikely to happen in my current geo.
But I'd expect the owner of expensive set/MFC would expect guest party to be at same level , so both sides can benefit. Meaning that meetup with everyone bringing 8.5d meter to verify with one member's MFC is likely possible, unlike having guests with ten 4.5 handhelds, which just mean work for calibrator owner
After all cross-comparisons are key aspect in metrology. No matter how great and stable is the equipment, there are always statistic laws at play. And all of this is not cheap, so resulting cal club member list will be rather short anyway.