Leica Geosystems TPS110C - Manual (Page 54)

Checking and Adjusting 54
Checking and Adjusting
TPS100z16
c Electronically
The instruments are adjusted in
the factory prior to shipping.
Instrument errors can change
with time and temperature.
These errors should be
determined before the
instrument is used for the first
time, before precision surveys,
after long periods of transport,
before and after long periods of
work, and if the temperature
changes by more than 10°C
(18°F).
Before determining the
instrument errors, level-
up the instrument using
the electronic bubble. The
instrument should be secure
and firm, and should be
protected from direct sunlight in
order to avoid thermal warming
on one side only.
Line-Of-Sight Error (Hz-Collim.)
The line-of-sight error or
collimation error (C) is the
deviation from the perpendicular
between the tilting axis and the
line of sight.
The effect of the line-of-sight
error to the Hz-angle increases
with the vertical angle.
For horizontal aimings the error
of the Hz-angle equals the line-
of-sight error.