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

Mike Millen mike.millen.uk at gmail.com
Fri Nov 11 01:28:27 EST 2016

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.


On 10/11/2016 20:53, cdelect at juno.com wrote:
> Skip,
> The easiest way to determine the oven resistor values for an unmarked
> tube is to directly measure the oven temperature and select a resistance
> to set it at the temperature you want.
> Your tube is a STD tube so I'd set it at 90 degrees C.
> Take a thermocouple meter and thermocouple and cut the junction off the
> end of the thermocouple.
> Attach a couple tiny alligator clips or grabbers.
> Next look at the potting around where the tubes cables come out.
> You should see short stubs of two different color wires peeking out of
> the potting.
> These are the ends of a thermocouple connected directly to the oven
> housing!
> I can't remember which type thermocouple it is. (I'll look in my notes
> and at the meter I use and let you know!)
> Connect the wires to your meter matching the color of the wires.
> Now with the tube cold you should see the ambient temperature on the
> meter.
> Power up the unit and you will see the temp start to rise.
> It will stabilize at the point determined by the resistance you selected.
> If too hot increase the resistance if too cold decrease.
> Cheers,
> Corby

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