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6 CHECK AND ADJUSTMENT
6.3.6 Adjustment of Vertical Angle 0 Datum
If when measuring the vertical angle of target A at telescope position normal (direct) and reverse
settings, the amount of normal and reverse measurements combined is other than 360° (ZENITH-0),
half of the difference from 360° is the error amount from corrected 0 setting. Carry out adjustment. As
adjustment for vertical angle 0 setting is the criteria for determining instrument coordinate origin, use
special care for adjustment.
1
Level the instrument properly with the
plate level.
2
Press the [ADJUST] icon.
3
Press the [V ANGLE 0 ADJUST] key.
4
Collimate target A from the telescope properly
in normal setting.
5
Press the [SET] key.
6
Collimate target A in reverse telescope setting.
7
Press the [SET] key.
Measured value is set and carry out
adjustment mode.
8
Check that the total amount of normal and
reverse angular travel is 360° collimating the
target A by normal and reverse positions.
Summary of Contents for GPT-7500 Series
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