If I recall correctly, a Josephson Junction is the critter you are looking for. Put one at liquid nitrogen temperatures, feed it with a precise microwave frequency, and it will produce a known voltage. Typically, JJ's are strung together to produce 1, or 10 volts. The US standard volt is defined in terms of a JJ excited by a particular frequency.
Now what we need is a TAPR priced JJ array. -Chuck Harris Scott Burris wrote: > Now that many of us have a nice 10Mhz reference courtesy of TAPR, > I was wondering if there was any way to use that to build a precise > voltage or resistance standard? > > I've got once of those high precision standard resistors with a sticker > on it noting the actual measured resistance. Is it still accurate? Who > knows? > > As well, I have a +5v reference that uses an Analog Devices precision > reference chip as its source. I have more faith that this reference is > correct within the tolerances specified in the datasheet. > > Now if I could somehow take that frequency reference and derive a > voltage standard or the like, I'd be in business. But I can't think > of a way that wouldn't require calibration of some sort, and if I had > the means to calibrate, I wouldn't need the standard in the first place. > > Any voltage-nuts or resistance-nuts out there? > > Scott > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
