[time-nuts] Need some wisdom from the cesium beam tube gurus out there

jimlux jimlux at earthlink.net
Fri Nov 11 08:02:53 EST 2016


On 11/10/16 10:28 PM, Mike Millen wrote:
> It would work as well if you used a pair of regular copper wires to
> connect the meter to the thermocouple...
>
> The junctions created by all the new connections will cancel out.
>

as long as the temperatures are "exactly" the same,
(Seebeck coefficient varies with temperature)
and the two metals at the junctions are the same,
(ditto, but the curves are different for different materials)
  and the mechanical configuration is the same
(current density also affects it)


For run of the mill "measure to 1 degree at room temperature" you can 
probably make that assumption.

But if you're looking for precision, you need to take this stuff into 
account (that's what "cold junction compensation" is all about.. )




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