Leica Geosystems TPS1100 Professional Series - User Manual - Manual (Page 29)

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TPS1100 - User Manual 2.2.1en Checking and adjusting
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Checking and adjusting
All instruments basically have
inherent mechanical defects which
can affect the measurement of
angles. The electronic angle-
measuring system of the TPS1100
routinely corrects the mechanical
instrument errors listed below; the
vertical angles relate to the plumb
line and the horizontal measurements
are corrected for line-of-sight error,
for tilting-axis error and for vertical-
axis tilt:
• l, t Compensator index error
• i Vertical-index error
• c Line-of-sight error
• a Tilting-axis error
• ATR ATR zero-point error (only for
TCA and TCRA versions)
Take note that the procedure
for determining the relevant
instrument error has to be followed
precisely and carefully.
The determination of the
instrument errors can be
started in any telescope face.
Immediately after the first
measurement has been
completed, motorized instruments
change automatically to the second
face, after which the user merely
needs to carry out the fine pointing.
Electronically
The instrument errors listed on the
left can change over time and with
temperature.
They should, therefore, be
redetermined in the order shown
below:
• before the first use
• before each precision survey
• after long periods of transport
• after long periods of work
• if the temperature alters by more
than 20°C
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.