Chapter 3
Theory of Operation
P/N 57150002, Revision 5.0 3 - 81 Trimble S, VX, SPS & RTS Service Manual
F
Tracker system
Trimble S6 instrument is designed to use both "passive" and "active" targets. Applications such as
monitoring surveys often require the instrument to be able to lock onto "passive" targets.
Passive targets, such as a prism that do not have a built in LED. Traditional passive tracking systems
are generally limited by range and tracking reliability. However, they do provide the user with the
additional flexibility of being able to use a variety of target types.
Trimble MultiTrack Target is designed for both Active and Passive Tracking. Active tracking ensures
you always locate and lock on to the correct target. When you're using the Trimble MultiTrack
Target, nearby reflective surfaces, such as road signs, cars, safety vests, and other prisms, will not
disrupt your surveys.
The Autolock technology in the Trimble S6 instrument has been developed using the same principle
used in the Trimble 5600. The main difference between the two systems is that the active LED
component has been integrated into the Trimble S6 instrument to provide a fully coaxial system with
the optics, EDM and Autolock.
Trimble Autolock™ Technology
The Autolock™ technology in the Trimble S6 instrument is located coaxially within the telescope
unit, as shown below.
Fig. 3-74 Autolock™ in the Trimble S6
The instrument uses an infrared beam that is transmitted from the instrument via the main optics. The
spread of the beam emitted from the instrument is 5m at 100m. The beam is reflected from a prism
back via the coaxial optics of the instrument to a photoelectric detector, which detects the position
deviations of the signal. The photo electrical detector utilizes a four quadrant detector with
differential amplifiers to determine the horizontal and vertical direction to the reflected infrared
signal.
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