Topcon GPT-7500 Series, Instruction Manual

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53
3 STANDARD MEASUREMENT MODE
3.1.2 Switching Horizontal Angle Right/Left
Make sure the mode is angle measurement.
.
1
Press the [F4] key to get the function as on
page 2.
2
Press the [F3] key.
The mode Horizontal angle Right(HR) switches
to angle Left(HL) mode.
3
Measure the target in the same manner as HR
mode.
•
Every time pressing the [F3] key is pressed, HR/HL mode switches.
Reference : How to Collimate
1
Point the telescope toward the light. Turn the diopter ring and adjust the diopter so that the cross
hairs are clearly observed.
(Turn the diopter ring toward you first and then backward to focus.)
2
Aim the target at the peak of the triangle mark of the sighting collimator. Allow a certain space
between the sighting collimator and yourself for collimating.
3
Focus the target with the focusing knob.
*If parallax is created between the cross
hairs and the target when viewing
vertically or horizontally while looking
into the telescope, focusing is incorrect
or diopter adjustment is poor.
This adversely affects precision in
measurement or survey.
Eliminate the parallax by carefully
focusing and using diopter adjustment.
Focusing knob
Telescope eyepiece (Diopter ring)