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Anyone have any suggestions how I can go about performing a Gauge R&R on a interferometer measurement system used to measure scanners Z range in microns. I am getting a lot of variation in the values and it doesn't stabilize. I quickly record the first value that comes up before the values go crazy. This test consist of a controller, a lazer, PC, software, and a fixture. I am told the unit does not stabalize because of thermal drift. I hope you can help. Thank you.