Assessments - 3, GPA: 4 ( )

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To ensure a precise angle measurement, tilt sensors must be turned on. The display can also be used to fine level the instrument. If the (TILT OVER) display appears the instrument is out of automatic compensation range and must be leveled manually. l GTS-820A series compensates both the vertical angle and the horizontal angle readings due to inclination of the standing axis in the X and Y directions. l For more information about dual axis compensation, see Chapter “APPENDIX” “Dual Axis Compensation”. l The display of Vertical or Horizontal angle is unstable when instrument is on an unstable stage or a windy day. You can turn off the auto tilt correction function of V/H angle in this case. To set TILT correction mode ON/OFF, refer to next page or Chapter 8 “PARAMETERS SETTING MODE”. V W X S P O T Q D U R | Standing axis Zenith Inclination of the standing axis in the X direction Standing axis Zenith Inclination of the standing axis in the Y direction Trunnion axis Horizontal When the instrument tilted over correction range. Rotate the leveling screws and level the instrument. After leveling (when each axis is within ±1'30"), the display returns to the previous mode automatically. X,Y tilt correction range : within ±4' X: Y: X:+0°00'00" Y:+0°00'00" 2 PREPARATION FOR MEASUREMENT Setting Tilt Correction by Soft Key Enable you to select tilt ON/OFF function on page 2. The setting performed here will be memorized after powering OFF. [Example] Setting X,Y Tilt ON Operating procedure Option Display 1 Press [F6] key to get the function page 2. 2 Press [F5](TILT) key. Current setting is displayed. *1 3 Press [F2](ON-2) key. The display shows tilt correction value. [F6] [F5] [F2] V : 87°55'45" HR: 180°44'12" SD HD NEZ 0SET HOLD P1v REC HSET R/L V/% TILT P2v TILT ON (V) ON-1 ON-2 OFF ESC X:+0°00'00" Y:+0°00'00" 4 Press [F1] key. [F1] The display returns previous mode. *1) Pressing [F6](ESC) key, the display returns previous mode. l The tilt sensor setting will be stored in memory when the instrument is turned OFF. The tilt sensor option can also be changed in the Parameter Setting Modes. When you change the tilt sensor option in the angle measurement mode, it will change in the Parameter Setting Modes and visa verse. 2.7 Compensation of Systematic Error of Instrument 1) Error of vertical axis (X,Y tilt sensor offset) 2) Collimation error 3) Error of vertical angle 0 datum 4) Error of horizontal axis The above mentioned errors can be compensated by software, which calculated internally according to each compensation value. Also these errors can be compensated by software collimating one side of the telescope that is carried out to delete the error by turning in normal and reverse both sides of telescope so far. l To adjust or reset the above compensation value, see Chapter 9 “CHECK AND ADJUSTMENT” . l Enable you to stop this function, see Chapter 8 “PARAMETERS SETTING MODE” or Chapter 9 “CHECK AND ADJUSTMENT” . 2-7 2 PREPARATION FOR MEASUREMENT 2.8 Resume Mode ON/OFF The Resume mode will memorize the last display or mode when the power is turned OFF. When the power is turned back ON, the last display or mode will be shown. The Resume mode option only appears when the power is OFF. Power switch key OFF Power off Resume mode OFF ON ESC [F1] [F2] Pressing [F1](OFF) key or [F2](ON) key, select the resume mode. 2.9 How to Enter Numerals and Alphabet Letters Alpha and numeric character key entry is simple and quick from the key board. [Example] Renaming a file in the Memory Manager Modes. Operating procedure Option Display Rename Old name [TOPCON .DAT] New name [ ] 1 Press [F1](Alpha) key to be entering alphabet [F1] Alpha SPC < > letter mode. 2 Enter Alphabets. *1) Rename Type “H” Move cursor Type “I” Type “L” [9][9] [F4] [9][9][9] Old name [TOPCON New name [HIL.DAT] ] Type “ ” [4][4][4] [3][3][3] Num SPC < > 3 Press [F1](Num) key to be entering numeric [F1] Rename mode. Old name [TOPCON .DAT] Input “104” [1][0][4] New name [HIL 104 ] Alpha SPC < > 4 Press [ENT] when complete. [ENT] *1) When the same alpha key is to be typed two or more times consecutively, press [F4]( >) key between characters. This moves the cursor to the right. *2) Extensions can not be changed. 2-8 2 PREPARATION FOR MEASUREMENT 2.10 Memory Card How to insert a memory card How to extract a memory card 1) Pull the card cover lever to open the card cover. 2) Insert a memory card until the card guide is up. 3) Close the card cover. Card cover lever Card guide Memory card 1) Pull the card cover lever to open the card cover. 2) Pull down the card guide. 3) Extract the memory card. Card guide 2-9 2 PREPARATION FOR MEASUREMENT 2.11 Inclination of Prism and Measuring Error For the best results, aim or point prisms in the direction of the GTS-820A series so that maximum signal can be returned to the instrument. Sighting prism obliquely because of inclined settings, may result in measuring errors. These errors will be proportional to the misalignment as showing in f...

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