Description: Leica Geosystems instruments are manufactured, assembled and adjusted to the best possible quality. Quick temperature changes, shock or stress can cause deviations and decrease the instrument accuracy. It is therefore recommended to check and adjust the instrument from time to time. This check and adjust can be done in the field by running through specific measurement procedures. The procedures are guided and must be followed carefully and precisely as described in the following chapters. Some other instrument errors and mechanical parts can be adjusted mechanically.
Electronic adjustment: 
Mechanical adjustment
The following instrument parts can be adjusted mechanically:
• Circular level on instrument and tribrach
• Optical plummet - option on tribrach
• Allen screws on tripod
Precise measurements
To get precise measurements in the daily work, it is important:
• To check and adjust the instrument from time to time.
• To take high precision measurements during the check and adjust procedures.
• To measure targets in two faces. Some of the instrument errors are eliminated by averaging the angles from both faces.
➜ During the manufacturing process, the instrument errors are carefully determined and set to zero. As mentioned above, these errors can change and it is highly recommended to redetermine them in the following situations:
• Before the first use
• Before every high precision survey
• After rough or long transportation
• After long working periods
• After long storage periods
• If the temperature difference between current environment and the temperature at the last calibration is more than 20 °C
Summary of errors to be adjusted electronically
