3 Setup
Measuring the instrument heights
The Instrument Height (IH), also called True Vertical, is the distance between the Known Point used
during instrument setup and the centre of the mirror. As this centre is not accessible, two
measurement marks are on the left side of the instrument and one on its right side.
The Top Mark ❶ corresponds to the Trunnion Axis of the instrument. The Bottom Mark ❷ is
0.184 m below the Top Mark. The Bottom Mark is at a distance of 0.1675 m from the center of the
instrument.
Trimble TX8 3D Laser Scanner User Guide 50
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