Chapter 3
Theory of Operation
P/N 57150002, Revision 5.0 3 - 75 Trimble S, VX, SPS & RTS Service Manual
F
Fig. 3-67 EDM High Precision / DR Standard / DR functional diagram
The phase measurement needs multiple modulation frequencies to rich a non ambiguous results
because the phase measurement can only measure the phase of the wave rest piece.
Transmitter unit
The unit includes a laser drive board with laser diode, the unit also includes the tracker transmitter.
When the EDM is in DR mode the tracker transmitter is closed by a shutter.
IPC
Tranceiver
Laser drive board
Reference mirror
Reference fibre
Switch motor (paddle)
Greywedge motor
Receiver fibre
Filter motor
Front
lens
Transmitter Prism
Filter
Receiver diode APD
Transmitter laser diode
Reflex coupler
EDM High Precision Distance Unit
Tracker reflector
EDM reflector
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