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Measuring the temperature of a soldering iron tip

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artag:
I have (or had, I don't remember if I still have it) a Weller tip temperature measurement system. It's surprisingly complicated.

The sensor, according to the manual, measures thermal flow. I'm not sure how it does that but it's something like a thermocouple so may actually detect zero temperature difference between the two sides : as wraper says, this gives 0 volts out.

This is combined with a normal adjustable iron with the sensor embedded in the tip. The temperature is adjusted automatically for zero heat flow and when that occurs, the measured tip is the same temperature as the exciter tip. It's like the potentiometer null method of measuring voltage, but for temperature.

The idea of all this is to measure temperature without loading the object - something that is only achieved if the null sensor is sufficiently sensitive. But presumably Weller thought it usefully better than the smallest thermocouple available to them.

The thermal photograph measurements should be as good, but only if the surface emissivity is known.

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