4 Setup
Instrument height measurement:
The measured distance (Hm) is corrected for the slope of the measurement to obtain a vertical
measurement to the bottom mark (Hc). The constant from the bottom mark to the top mark (0.158
m/0.518 ft) is added to the Hc to obtain the vertical instrument height from the ground mark to the
trunnion axis (Ih). For more information, refer to the Survey Pro documentation.
Alternatively, to obtain an accurate measurement to the top mark (Ih), you can manually measure the
slope distance from the ground to the bottom mark (Hm). To calculate the total instrument height (Ih),
insert the measured slope distance (Hm) into the formula below:
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