FOCUS 35 TOTAL STATION USER GUIDE
4 –
Setup
41
Setup
An instrument setup with good measuring stability will increase the precision in the measurement
result and allow you to utilize the measurement precision of the Spectra Precision FOCUS 35
Total Station to its full extent.
Setup Stability
When an instrument is setup it is important to consider the following:
1. Set tripod legs wide apart to increase the stability of the setup. A setup where one leg is placed
on, for example, asphalt and the other two on soil will still be a stable setup provided that the
tripod legs are set wide enough apart. If it is not possible to set the tripod legs wide apart due to
obstacles, then the tripod can be lowered to increase stability.
2. Make sure that all the screws on the tripod and/or tribrach are tightened to avoid any play.
3. Any high quality tripod and tribrach can be used. However, Spectra Precision strongly
recommends the use of tripod heads made of steel, aluminium or similar material. Tripod heads
of fiberglass or other composite materials are not recommended.
See also
StepDrive Motor System and Focus System, page 92
Measurement Stability
Take into account that instruments require sufficient time to adjust to the ambient temperature. The
following rule-of-thumb for a high precision measurement applies: Temperature difference in degree
Celsius (°C) x 2 = duration in minutes required for the instrument to adjust to the new temperature.
Avoid sighting across fields with intense heat shimmer by sun light, e.g., at noon.
