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17 CHECK AND ADJUSTMENT
17-2
17.2 Checking the Optical Axis
To check if the optical axis of EDM and theodolite are matched, follow the procedure below. It is
especially important to check after adjustment of the eyepiece reticle is carried out.
1) Position a prism about more than 150m apart from GPT-2000 series .
2) After the power switch ON, collimate the center of the prism by prism mode.
3) Press the [F4] key to get the soft key page 2 in the
distance measurement mode or page 3 in the
coordinate measurement.
4) Press the [F3](S/A).
Buzzer sounds continuously.
● H direction confirmation (Do not move V direction).
5) Turn the horizon taltangent screw, move the collimating point to the left side of prism gradually until
buzzer sound stops.
6) Turn the horizontal tangent screw slowly, and move the collimating point to the prism center
gradually until at the position buzzer starts.
Confirm the level of the signal (light quantity level) in display to adjust at the level of one to two as
shown in below by turning the horizontal tangent screw.
7) Press the [ESC] key and measure the horizontal angle, and note the horizontal angle displayed. Or
you can do 0-set of horizontal angle.
8) Return to the Set Audio mode again.
9) Turn the horizon taltangent screw, move the collimating point to the right side of prism gradually
until buzzer sound stops.
HR: 120°30'40"
HD* 123.456 m
VD: 5.678 m
MEAS MODE NP/P P1
↓
OFSET S.O S/A P2
↓
PSM:0.0 PPM 0.0
NPM:0.0
SIGNAL:[❙ ❙ ❙ ❙ ❙]
PRISM PPM T-P –––
Prism
Reticle
Prism
Reticle
PSM:0.0 PPM 0.0
NPM:0.0
SIGNAL:[❙ ❙ ]
PRISM PPM T-P –––
Quantity level two
Prism
Reticle