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24.7 The adjustment of horizontal axis error correction
As the horizontal axis error only affects the angle of sight line, it can be only confirmed through
observing the target which height is obviously lower or higher than instrument.
To avoid the influence of collimation axis error, user must have an associated adjustment before
adjusting collimation axis.
It is unnecessary to observe prism or a target plane to confirm horizontal axis error. Therefore user
is enabled to launch this adjustment at any time. Select a recognizable point which is rather far
away from instrument, and much higher or lower than the instrument, and it is able to precisely
observe the point twice.
Operation Procedure
Key
Display
1) Under Instrument constant setting functions,
choose “4. Horizontal axis” and press ENT key (or
press numeric key 4), enter horizontal axis error
correction menu.
“4.Horizo
ntal Axis”
+
ENT
Instr. Const
1. V0/Axis const.
2. V0 Adjustment
3. Collimation
4. Horizontal Axis
2) The screen shows as right diagram, at face left
position sight at the target precisely (The obliquity is
among ±10°
～
±45°)
，
press MEAS 10 times.
Face left and
sight at target
+
MEAS
10 times
Horizontal Axis
Step-1 [00/10]
V 120°00′00″
HR 0°0′0″
HAx 0°00′00″
SET MEAS INPUT
3) Rotate telescope. At the reverse position (face
right) sight at the same target precisely, press MEAS
10 times.
Face right
and sight at
target
+
MEAS
10 times
Horizontal Axis
Step-2 [00/10]
V 240°00′00″
HR 180°00′01″
HAx 0°00′00″
SET MEAS INPUT
4) Setting finished, screen shows “Complete!”
SET
Horizontal Axis
Complete
[10/10]
V 240°00′00″
HR 180°00′01″
HAx 0°00′01″
SET MEAS INPUT
