120
Ⅱ
. Adjustment
6. Press F3: [
OK
] to set the horizontal angle to 0
°
,
“Take F2” is displayed.
7. Rotate the top of instrument 180
°
/200gon. Wait a
few seconds for the display to stabilize, then press F3:
[
OK
].
8. If both correction constant are in the range, press F3:
[
YES
] to renew the correction angle, or press F4: [
NO
]
to give up this adjustment,
26.10 Vertical Index Error
The deviation between vertical circle zero position and horizontal direction is vertical
index (i), it is necessary to concern this error when measure vertical angle. The instrument
program applied a formula to correct this error.
Warning: Before starting this operation, be sure to read this manual carefully, otherwise it
may cause data faulty.
Because of the close relationship between vertical index and compensator zero position, it
is necessary to check and adjust compensator zero position before adjusting vertical circle,
the value should be stable when reading.
Ⅰ
. Check:
Please adjust the reticle of telescope and correct the collimation error before this
operation.
(1) Mount the instrument at the tripod or a stable device and level it accurately, then turn
on the instrument.
(2) Aim at the cross-hairs of collimator or the obvious target at a distance, VA should be
about ±10°. Read the face left angle Vl and face right angle Vr.
(3) Calculate the index error according to the formula below:
i = ( Vl+Vr-360°)/2
(4)If I<10
〞
, no adjustment is necessary , or you have to adjust it .
Ⅱ
. Adjustment by program:
X Old 0.0020gon
Y Old 0.0022gon
X New 0.0006gon
Y New -0.0004gon
Set ?
Y E S
NO
0
Tilt offset
X -0.0008gon
Y 0.0012gon
Take F2 II
0
OK
0
