FOCUS 35 TOTAL STATION USER GUIDE
4 –
Setup
63
Instrument Adjustment and Calibration
The section describes the instrument adjustments and calibration routines, adjustments for Laser
Pointer (see
), for Optical Plummet (see
), and for Tribrach Circular Level (see
These adjustments and calibrations will change over time, the most common changes being caused
by:
•
Wear and tear with use
•
Bumps and knocks during transit
•
Large changes in operating temperature
Spectra Precision recommends that a collimation and calibration check be carried out routinely as
follows:
•
After any long uncontrolled transport of the instrument (e.g., after service or shipment to a new
location)
•
After any accidental knock or drop
•
At any time when the operating temperature changes by more than 10 °C (18 °F)
•
At any time when the instrument changes it's height above sea level by more than 500 m
(1640 ft)
•
At any time when the highest accuracy positions are required
•
Routinely on a periodic basis (Monthly, weekly etc.)
Spectra Precision also recommends that the operator keep a record of the dates and values
measured so that any gross changes can easily be detected. Gross changes can indicate the need for
a check by an approved service center.
In all calibrations, multiple sightings will be made in both faces to ensure that any minor pointing
errors can be eliminated in the accurate determination of current collimation error values. All
measured collimation and calibration values are stored and used until a new set of values are
determined.
In a new instrument the values should be close to zero, over time these will change.
Compensator
Before starting the routine, level the instrument. An internal instrument battery must be present in
the side battery compartment. For instruments with Face 1 battery option, this battery compartment
must be empty. The instrument will automatically check if the compensator is within range before
the calibration is started.
The calibration process involves the instrument automatically reading the compensator value at a
series of predetermined positions through the full rotation of the instrument. The process takes
approximately one minute to complete. During the process the instrument should be on a stable
platform, free from vibration and untouched by the user.
