User`s manual

Biaxial Displacement Follower User’s Manual Version 1.4, April 19, 2004 IM1013
Page
21
Common Problems
The most common errors are:
1
Improper target phase (L/D, D/L, etc.).
2
Improper centering of tracker on target.
3
Improper illumination of target:
The light source must be DC.
The light intensity must be calibrated for (-20 Dark) and (+20 Light). See Operating Procedures, page 17 .
4
Improper focusing of tracker on target. See Operating Procedures, page 17 .