Reticle - Sokkia DT5 Operating Manual

Adjusting screw
moo~
¡g Very slightly loosen one vertical and one
horizontal adjusting screw by a certain
amount.
CI Place a small piece of plastic or wood
against one side of the top adjusting screw
mount as a buffer.
(l Look through the eyepiece and gently tap
the piece of plastic or wood to rotate the
reticle slightly.
CI Re"tighten the two adjusting screws (loo-
sened in ¡g) by the same amount.
WARNING: Over-tightening the adjusting screws may damage the
reticle.
Unequal tightening of the adjusting screws may mean that
the reticle will go out of adjustment.
CI Check the reticle perpendicularity again
using procedures a) and b) above and repeat
the adjustment if necessary.
Replace the reticle adjustment cover.
(J After this adjustment, the vertical and hori-
zontal reticle line positions should be
checked as follows:
13.3.2 Vertical and horizontal reticle line positions
100 m
l. ----------------------.--~ ...a) Set up a clear target about 100 metres (300
~\ A feet) from the DT5. Carefully level the DT5,
i " switch on and index the vertical circle.
V
H
s c::: G :G
I ri ., II I-i l-
I Ci :' -. '.' '.' ..
b) Sight the target on face left and read the
horizontal and vertical angles.
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c) Now sight the target on face right and read
the horizontal and vertical angles.
v i?S930aO
H :1::83'-1:0..
d) Subtract the horizontal face left angle from
e.g. H = 198'34'10"-18'34'00" the horizontal face right angle. The differ-
= 180'00'10" ence should be within 180. ::40".
e) Add the vertical face left angle and the
e.g. V = 90'30' 1 0" + 269'30'00" vertical face right angle.
= 360'00'10" The sum should be within 360. ::40".
If either of the values are 40" or greater,
repeat the above procedures.
If the difference is consistently 40" or greater, the theodolite reticle
should be adjusted using the following procedures:
Example when:
Horizontal F.L/F.R = 18'34'00"/198'34'40"
Le. error = + 40"
Note: Ensure that the vertical and horizontal
clamps are fully tightened.
Vertical F,L/F.R. = 90'30'10"/269'30'30"
Le, error = +40"
Mean 18'34'00" + 196'34'40"
H 2
= 198'34'20"
Mean 269'30'30" - 90'30'10"
V 2
= 269'30'10"
,CD Calculate the mean face right horizontal and
+ 90. .'
vertical angles, I.e.
+ 180'
h. I (F.L. + F.R.) 90.
orizonta = 2 +
rt. I (F.R. - F.L.) + 180.
veica= 2
¡g While still sighting the target on face right,
use the horizontal and vertical fine motion
screws to adjust the displayed horizontal and
vertical angles to the above values.
v 1:'E,93t: ie
H :983'-I?O
CI Look through the telescope. The reticle is
now slightly shifted from the target.
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