Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 227)

Leveling
217
2 Peg Test
The 2 Peg Test is used to check the collimation error of the
instrument. The test will compute the error, which can then be used
to adjust the horizontal crosshair of the instrument.
1. Position two rods 50 to 90 meters apart (165 to 300 feet).
2. Pace off the distance between the rods and set up the level
midway between them. (The placement of the rod over Point
B can be adjusted after shooting Point A.)
3. Carefully level the instrument. You should be able to rotate
the instrument 180° around its vertical axis without the
bubble moving away from the center.
4. From the Main Menu, select Leveling > 2 Peg
Test .
5. Tap Take Shot. The Leveling Shots screen will
open where you will be prompted to take each set
of shots to the rod over Point A. Once each shot is
completed for the number of sets entered in the
Level Settings screen, you will return to the Peg
Test screen.
6. Turn the instrument to the rod over Point B.