### Orienting the Tracker to Gravity (6dof devices only)

The NIVEL inclination sensor is designed to be used with Leica Geosystems Laser Tracker series. The NIVEL mounts on the top of the sensor unit or on top of the Overview Camera / T-CAM in order to establish the parameters for the Orientation to Gravity. It is then mounted on a bracket to monitor the stability of the Laser Tracker.

See the "Nivel 230 Hardware Guide" provided with you Nivel sensor for detailed information on the configuration and use of the Nivel sensor. Leveling to gravity is not required, but does improve Leica Tracker measurement results.

To Level to Gravity and Monitor the Leica Tracker:

1. Mount the Nivel sensor to the top of the Leica Tracker or the top of the T-Cam (if it is already mounted to the tracker). See the "Nivel 230 Hardware Guide".

2. Connect the LEMO cable to the Nivel.

3. Select the Tracker | Nivel | Start Tilt Readout menu item to display the Tilt Readouts window. The Tilt Readouts window helps by reading the Nivel measurement 3 times per second. The values can be maximized on the whole screen if needed.

Using the Tilt Readouts window to roughly level the tracker

4. Using the Tilt Readouts window, level the Leica Tracker base and the Nivel according to the steps in the "Nivel 230 Hardware Guide".

5. When the tracker it roughly leveled and brought into an acceptable working range, select the Tracker | Nivel | Start Orient to Gravity Process menu item. The laser tracker then performs Nivel measurements in all 4 Quadrants of the laser tracker and creates a generic plane feature and a leveled sensor coordinate system based on this plane.

Note: Any additional new alignments can use the gravity information if required. |

6. Once the procedure has been completed, PC-DMIS prompts you to move the Nivel to the monitoring position.

7. Mount the Nivel to the monitoring position according to the steps in the "Nivel 230 Hardware Guide".

8. Select the Tracker | Nivel | Start Monitoring menu item. This begins the process of monitoring the status of the Leica Tracker. The "Level To Gravity tab" of the Machine Options dialog box provides information about the leveled status. Every 60 seconds a reference Nivel measurement is made and compared with the original orientation.

Note: The Monitoring process is used to make sure that nobody moves or hits the tracker. It can be started explicitly if no Gravity plane is needed. In which case only the stability of the system should be monitored.