X-Tronic 9070-XR3 Instructions Manual page 10

Calibration Instructions
Once the desired temperature has been set and the temperature
of the unit stabilizes, measure the heat at the soldering tip using
a high quality and well calibrated soldering tip tester. If the
temperature shown on the unit's display does not reflect the
temperature shown on the tester. It is then time to calibrate the
unit.
The unit can be calibrated by pressing and holding the Menu Knob
for approximately 3 seconds, the screen will show °C/°F, then
press the knob two more times and it will say CAL. Turn the knob
to compensate for the degrees of variance. After 5 seconds the unit
will auto save the setting and return to the temperature setting and
is ready for use.
If calibration is used to compensate for a diminished heating
element, once the heating element is replaced the calibration
will need to be repeated to ensure the unit is operating at the
appropriate temperature.
Note: If this feature is used please be aware that without proper
testing equipment and methods, the outcome could be less than
desirable.
IMPORTANT - PLEASE READ
Infrared (IR) Thermometers should NOT be used to measure the
temperature of the soldering tip as they often provide inaccurate
readings. All IR Thermometers are different and the capability
depends on the Distance to Spot (D:S) ratio of the model being
used. Many IR thermometers have a D:S ratio of 8:1 or 12:1
which means that the thermometer needs to be a distance of 8"
or 12" in order to read a 1" spot size. The tip of a soldering iron is
approximately 2 to 3 mm (.07-.11"), requiring the thermometer to
be 0.8" or 1.2" away from the tip. However, the IR thermometer
also has a minimum distance it needs to be away from the object.
Most IR thermometers will not be capable of measuring such a
small spot size and will provide disappointing calibration results.
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