For this theoretical experiment, I find the deviation of the center point of a spherical probe by adding conductive heat through hand contact. If you want to perform this test, you will require an infrared thermometer to monitor temperature changes, a stopwatch to track time, and a FaroArm with available standard ball probes.
First, let’s review the set up for the experiment. At stability, which is achieved once the FaroArm/ probe reach the stable operating temperature, you want to perform a probe qualification and ensure that it is within spec. After wards, one must perform a DRO to a measured plane while system is still stable (before you add conductive heat). Moving the probe around the measured plane should yield a deviation no greater than your qualification accuracy. If this is the case, then you have a valid plane/qualification.