Topcon AP-L1A - Search Patterns; Search Range

7. APPLICATION FUNCTIONS
7-9
7.3.4 Search Range
The search range is the area to searched for the prism by rotating the telescope and body in
SEARCH mode. The SEARCH range is decided from the point where the prism lost, and the
values will be set to plus and minus directions in horizontal and vertical.
Select search pattern first, and set the search area to the selected search pattern.
(Refer to "15.4 Setting Special Mode")
Also it is enable to set each search pattern separately in normal and high speed pattern.
[Example] SEARCH range : 10
 in horizontal, 5 in vertical
Setting Search range requires consideration. The items to think about: optical path interrupted by
passing cars or passengers; collimated point from AP-L1A to prism is shifted after Turning and
Searching Command; possible other prisms, targets, or other objects to interfere with tracking the
desired prism; and many other examples all play a role in determining the search range.
7.3.5 Search Patterns
The search pattern is the rotating method of telescope and instrument to find the target prism in
search mode. Search pattern includes the following 2 ways that can be selected.
High speed
This pattern can be selected to search for the prism. The search
pattern tries to locate the prism in a very short time.
Instrument searches from up to down. The search range is in high
speed.
The searching is arranged to 10 times until the prism is found. The
auto tracking mode changes to manual mode when the prism could not
found out within 10 times searching, and returns to the point where the
prism is lost.
Normal speed
This pattern can be selected to search the prism at the point where the
prism is lost.
Instrument searches in up down direction gradually from the point
where the prism is lost.
The searching continues until the prism to be found.
 Precaution in selection of high speed pattern
1) Things like heat haze might interfere with the tracking system in the long distance, near
limit of auto tracking range, in search mode.
2) Reaction by rotating of instrument in search mode is serious. Be sure of each
connection part of the tribrach or tripod are firmly.
Point where prism lost
Search range
20
-10 +10
10
-5
+5