Topcon OS Series User Manual

Step Two: Levelling
1) Centre the bubble in the circular level by either shortening the
Tripod leg closest to the off-centre direction of the bubble or by
lengthening the Tripod leg farthest away from the off-centre
direction of the bubble. Adjust one more Tripod leg to centre
the bubble.
Turn the levelling foot screws while checking the circular level
until the bubble is centred in the centre circle.
2) Turn on the OS Series using the Power Button.
The “Virtual Bubble” is shown on the screen.
“” indicates the bubble in the circular level.
3) Centre “” in the Circular level.
4) Turn the Instrument until the telescope is parallel
To a line between levelling foot screws A and B.
5) Set the tilt angle to 0˚ using foot screws A and B for the X direction and levelling screw
C for the y direction Remember Fingers and Thumbs! Always turn A and B in opposite
directions to half the error on each foot screw.
6) Press {ESC} on the instrument keypad to return to observation mode.
7) If the instrument does not automatically open the MAGNET Field software, press
{PRG} on the instrument keypad.
Select “MAGNET Field” from the listed programs
The remainder of the Resection setup procedure is completed using MAGNET Field.

Topcon OS Series Specifications

General

Absolute Encoder	Yes
Automatic Collimation	Yes
Prism Range	Up to 5, 000 meters
Communication	USB, Bluetooth
Accuracy	1", 2", 3", 5" (depending on model)