Sokkia SRX1, Operator'S Manual, Page: 66 / 184

12. MEASUREMENT WITH AUTO TRACKING
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
Lost Prism
In the event that an obstacle prevents the SRX sighting the target during Auto Tracking, the
instrument will predict the direction in which the target will travel and continue Auto Tracking
based on this prediction. If the SRX re-acquires the target in this predicted direction, Auto
Tracking continues without change. If the target is not re-acquired however, Auto Tracking will
stop and the SRX will enter "prism wait" status for a period of 60 seconds.If the target enters the
field of view or a Turning command is received from the RC Controller during "prism wait", the
SRX will perform Auto Pointing, then resume Auto Tracking. If the target is not re-acquired
during the "prism wait" period, the target is considered "lost" and sighting terminates.
Start Auto Tracking procedure again from step 1.

• The following softkeys can also be used for Auto Pointing when "A.T. Setting" in <Motor
configuration> is set to "Track".
Softkey Function
[DIST] Performs Auto Pointing then Auto Tracking/distance measurement
[SRCH] Performs Auto Pointing then Auto Tracking/distance measurement
[H.ANG] Sets current angle to a specified angle then performs Auto Pointing/
Auto Tracking
[0 SET] Sets current angle to 0 then performs Auto Pointing/Auto Tracking
[RC] Rotates in the direction specified by the On-demand Remote Control
System then performs Auto Pointing/Auto Tracking
[<-RC] Rotates in a counterclockwise direction (from the point of view of the
RC Controller) then performs Auto Pointing/Auto Tracking
[RC->] Rotates in a clockwise direction (from the point of view of the RC
Controller) then performs Auto Pointing/Auto Tracking
"Prism wait"
Target "lost"
Direction predicted
Auto Tracking
Obstacle
Target
Target
Target found
Target found
not found
not found