Topcon GTS-823A - Manual (Page 41)

3-6
3 AUTOMATIC TRACKING / AUTOMATIC COLLIMATION
[Example] SEARCH RANGE : 10
°
in horizontal, 5
°
in vertical
Setting Search range requires consideration. The items to think about: optical path interrupted by other
objects; collimated point from GTS-820A series 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.
Note: This search range is only for auto-tracking function. The search range of auto-collimating is fixed
as ±5
° in both directions horizontal and vertical.
3) Wait Time
The time the prism is lost before GTS-820A series starts the searching. Setting time is 1second step
maximum 60 minutes.
If the mode is set to [HOLD], mode will not change to searching.
4) Tracking Speed
Choose the mode of “Survey” or “Machine Control” according to the purpose of measurement.
5) Reflector type
You can choose a reflector type according to reflective objects such as Prism-2 or reflector tape.
This setting will reduce incorrect tracking.
6) Prediction operating time
After the instrument loses a prism, the time (prediction operation time) for the instrument to continue
moving operation can be set up.
During auto tracking operation, when auto tracking axis between the instrument and a prism is
intercepted by a tree etc., the moving is continued supposing a motion (prediction) of the prism till then.
It is effective in auto tracking operation after the prism is intercepted with the obstacle by this function.
When an obstacle is large, the prediction operation time should be set up long.
Moreover, when you want to terminate auto tracking operation immediately at the point which missed
the prism, and to be changed into a search state. Prediction operation time should be set up short.
SURVEY
l In case requiring auto aiming in high accuracy to the prism which is still.
l Suitable for fixed point observation, management of landslides, surveying
displacement of dam.
l When beginning auto-tracking, the instrument needs to collimate stable prism.
MACHINE
CONTROL
l Suitable for controlling of construction machinery or real time surveying of variety
traveling objects.
l When beginning auto-tracking, the instrument can track a prism, even if the prism is
moving.
Note: If the Machine Control mode is chosen, the GTS-820A may incorrect-track the headlight of a car
etc. temporarily.
-10 ° +10 °
-5 °
+5
°
20 °
10 °
Search range
Point where prism lost