User's Manual

Spectra Precision Focus 4 Total Station User Guide 35
Setting up the Instrument 2
Make sure there are no obstacles between the instrument and the target when taking
measurements. When you need to take measurements across a road or a place where
vehicles or other objects are frequently moving, take several measurements to a target
for the best result.
Viewing and changing the measurement settings
Hold down [MSR1] or [MSR2] for one second.
• To move the cursor between the fields, press [^]
or
[v].
• To change the value in the selected field, press [<]
or
[>].
The available values are:
Target field
If the measurement is started with the Target field set to Prism mode, there is a dash in
front of the prism constant, for example
–18 mm.
If the measurement is started with the Target field set to N-Prism (Reflectorless) mode,
there is square bracket in front of the prism constant, for example
]18 mm.
The displayed symbol will continuously move from left to right over the prism
constant in the display.
Prism constant
The factory default of the prism constant value of the
Focus 4 total station is
-30 mm.
Change the prism constant to match the constant
value of the prism you are using.
Once you have set up the instrument, you can turn on the Focus 4 total station, change
the instrument settings, and start a job. See also page 37.
Field Values
Target Prism mode
N-Prism mode
Constant (prism
constant)
-999 mm through 999 mm
Mode Precise
Normal
Track Track (continuous MSR) ON
Track (continuous MSR) OFF