Trimble S - Measuring through glass window; Window reflection from EDM

Chapter 1
General Information and safety
Trimble S, VX, SPS & RTS Service Manual1 - 28 P/N 57150002, Revision 5.0
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Measuring through glass window
Guidelines when measuring through glass windows
• A modern window glass should be fine. Avoid using tinted glass window.
• The range is reduced by 10-20% when measuring through a window.
• Depending on the window angle to the instrument the window can introduce back reflection
from the EDM to the instrument front lens. See fig below.
• The field of view through the glass window is limited horizontal by +/-60 deg and vertical by
+/-30 deg.
Window reflection from EDM
Use the laser pointer to verify the EDM reflex is outside the optical lens.
Fig. 1-36 Problem with reflection
Fig. 1-37 No problem with reflection