1 . Technical Data Page
2. Description 5
2.1 Instrument 5
2.1.1 Tribrach GDF22 5
2. 1.2 Lower Part 6
2.1.3 Alidade 7
2.1.4 Telescope 8
2.1.5 Container 9
2.2 Tripod 10
3. Instructions 10r Use 11
3.1 Setting Up the Tripod 11
3. 1.1 With GST20 Tripod 11
3.1.2 General Hints 12
3.2 Unpacking and Setting Up the Instrument 13
3.3 Centring and Levelling Up 14
3.3.1 Centring with the Plumb Bob 14
3.3.2 Centring with the Centring Rod 14
3.3.3 Levelling Up 15
3.3.3.1 Levelling Up with the Plate Level 15
3.3.3.2 Levelling Up with the Automatie Index 16
3.3.4 Centring with the Optieal Plummet 17
3.3.5 Centring under Roof Points 18
3.3.6 Measuring the Inclination of the Standing Axis 19
3.4 Focusing and Sighting 21
3.4.1 Retiele Cross Hairs 21
3.4.2 Target Image Focusing 21
3.4.3 Sighting 21
3.5 eirele Readings 22
3.6 Setting the Horizontal Circle to Zero or Required Value 24
3.7 Measuring Angles 25
3.7.1 Measuring Horizontal Angles 26
3.7.2 Measuring Vertical Angles 27
3.7 Measuring Vertical Angles with the 3 Wire Method 29
3.8 Tacheometric Observations 30
4. Optional Accessories 31
4.1 Telescope Level 31
4.2 Autocollimation Equipment 31
4.3 Eyepieee Lamp 35
4.4 Parallel Plate Mierometer 35
4.5 Auxiliary Lenses 36
4.6 Piliar Plate 36
4.7 Centring Rod 37
4.8 Optional Eyepieees 37
4.9 Eleetrie Illumination 37
4.10 Forced Centring and Target Sets 39
4.11 Plumbing Equipment 41
4.12 Eyepieee Prisms for sighting up to 65° vertieal angle 43
4.13 Filter fo r Telescope Eyepieee Prism 44
4.14 Diagonal Eyepieees for sighting up to the zenith 44
4.15 Eyepieee Fi lters 44
4.16 Wild-Roelofs Solar Prism 45
4.17 Aeeessories for Control and Deformation Measurements 46
4.17.1 Tribrach GDF24 with Ball Centring Deviee 46
4.17.2 Centring Socket 46
4.17.3 Cireular Bubble 47
4.17.4 Centring Socket Target Insert 47
4.17.5 Permanent Target Bolts 47
4.18 Wild GAK1 Gyro Attachment 48
4.19 EDM equipment 48
4.20 Wild GLO Laser Eyepieee 49
5. Testing and Adjusting 50
5.1 Tripod 50
5.2 Plate Level 50
5.3 Cireular Bubble of Tribrach Centring Tripod Head 51
5.4 Horizontal Collimation Error 51
5.5 Index Error (Vertical Collimation Error) 54
5.6 Optical Plummet 56
5.7 Carrier GZR2 for Target or Reflector 59
5.8 Centring Rod 59
6. T2 with Built-in Autocollimation Eyepiece GUFA 60