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.
Mike
On 10/11/2016 20:53, cdel...@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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