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K should approach to 0. If the absolute value of K is
greater than 5 mm, then users may have to set the instrument in
a standardized baseline field for strict measurement.
Calibration
If proving that the constant K changes and does not
approach to 0 after a strict checking, then adjust the constant by
setting the addictive constant as a integrated constant K. e.g the
measured new K is -5 and the former instrument constant is -20,
then the new value to be set should be -20-(-5)=-15; input value
-15 into „Menu→6.calibration→3.Add const‟.
Users should orient with the vertical wire of the
instrument to align A, B and C strictly. A fixed clear centering
symbol should be on point B on the ground.
To make sure that if the center of prism B at point B
coincides with the instrument center exactly is an essential
concern of precision. Therefore, please set up tripod and
pedestal that can be employed by both (prism B and
instrument). e.g. when exchanging three-point prism connector
and pedestal, the pedestal and the three-point can remain at the
origin. The only exchanged parts are prism and instrument,
both being above the pedestal, so that the error can be
minimized.