[time-nuts] any way to bootstrap a frequency standard into a voltage or resistance standard?
cfharris at erols.com
Fri Nov 28 05:42:27 UTC 2008
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.
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
> 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?
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