Given that a laser interferometer based (x-y linear distance)measuring machine has a fundamental standard built into it, some would say that the machine is inherently traceable. Since there are many ways for inaccuracies to creep in (laser not parallel to guideways, straightness, etc.) it would seem that to be traceable the machine must be tested by measuring stage travel in the measurement plane by a calibrated scale or calibration laser.
Comments?
Alternatives?
Comments?
Alternatives?