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Proton Products SL mini and SLR mini Series Speed and Length Gauges Instruction Manual - issue 1s
Optical alignment
Non-perpendicular alignment of the speed and length gauge to the measured object will degrade
measurement accuracy; it is recommended the gauge is installed and aligned by technicians with
metrology experience who understand the implications of even a small angular misalignment.
Correct Gauge Alignment
Roll alignment
Yaw alignment
Pitch alignment
Ideal
Acceptable for within ±5°
( ≠ 0 may be used to prevent receiver
saturation for highly-reflective objects)
Incorrect Gauge Alignment
Roll cosine error
Yaw cosine error
90°
90°
90°
α
90°
