[time-nuts] Voltage standards
Lux, James P
james.p.lux at jpl.nasa.gov
Mon Dec 1 03:33:58 UTC 2008
On 11/30/08 5:29 PM, "Brian Kirby" <kirbybq at bellsouth.net> wrote:
> A cryo may be hard to put togather (and maintain - from experience)
> but there are plenty of peltier junctions/devices out there...
>
> Brian KD4FM
>
> Lux, James P wrote:
>> Cost wise, I like the snippet I read in Scientific American a decade or so
>> ago.. LN2 is the cost of milk, LHe is the cost of fine scotch whisky
>> Is a obsessive precision worth a bottle of scotch?
>>
>> Jim
Can't get that cold with Peltiers.. Even 77K is a stretch. You run into a
problem with the maximum delta T from one device, and then having to suck up
the heat from that one. You wind up with a pyramid shaped stack with
terrible efficiency.
The Melcor website has details.
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