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20.11 Restoring Default Settings ....................................................... 125
21. WARNING AND ERROR MESSAGES........................... 126
22. CHECKS AND ADJUSTMENTS..................................... 129
22.1 Circular Level .......................................................................... 129
22.2 Tilt Sensor ............................................................................... 130
22.3 Collimation ............................................................................... 133
22.4 Reticle ..................................................................................... 134
22.5 Optical Plummet ...................................................................... 136
22.6 Additive Distance Constant ..................................................... 137
22.7 Laser Plummet (Option) .......................................................... 139
23. POWER SUPPLY SYSTEM ........................................... 142
24. PRISM SYSTEM............................................................. 143
25. OPTIONAL ACCESSORIES........................................... 144
26. SPECIFICATIONS .......................................................... 146
27. EXPLANATIONS ............................................................ 151
27.1 Manually Indexing the Vertical Circle by Face 1/2 Measurement .. 151
27.2 Correction for Refraction and Earth Curvature ........................ 152
28. REGULATIONS .............................................................. 153
29. INDEX ............................................................................. 158