On 20 October 2016 at 00:08, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote:
> -------- > In message <CANX10hCbbrWvtQhybFf-Pm1uaSyZ3agHLEo8p_5iyoyYR- > g...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >The question about the Josephson Junction Array got me thinking. I wonder > >if there are any sort of technologies that can produce a voltage with much > >better stability than the LTZ1000, but without the cost of a Josephson > >Junction Array. A sort of half-way house. > > As far as I know there are only two steps between the LTZ1000 and JJAs: > > 1. Specially cared for LTZ1000's (See: Fluke) > Do you have a specific reference? A google found lots of kits on Fluke and LTZ1000, but none of the pages were from Fluke. > 2. Lots of LTZ1000's to get sqrt(N) reductions. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > But that assumes the drifts are completely uncorrelated, which I doubt is the case - especially if they are all from the same batch. But there are a limited number of resistors of the quality needed (Vishay is the only one I can think of), and PCB materials are likely to be the same. It seems to me that you would not gain sqrt(N) unless N is quite small. How small, is anyone's guess. Dave _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.