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23 CHECKS AND ADJUSTMENTS
8) Check the reticle perpendicularity
again using procedures I ) and 2)
above and repeat the adjustment
if necessary. Replace the reticle
cover.
Note : After this adjustment, perform
the check and adjustment of
the reticle position as follows:
Vertical and horizontal reticle line positions
(ChecL)
1) Set up a clear target 50 - 100m
from the SET2C. Level the instru-
ment carefully, switch on, and in-
dex the vertical and horizontal
circles.
2) Sight the target o n face left. Read
the vertical and horizontal angles.
e.g.
HAR 18O34'00"
.....
a1
ZA 90°30'10"
.....
b l
3) N o w sight the target on face right.
Read the vertical and horizontal
angles.
e.g.
HAR 198"34'10"
....
a2
ZA 269°30'00"....b2
4) Calculate a2
-
a1
=
180°00'10".
The difference should be w~thir-
180"
-r
20".
5)
Calculate b l + b2
=
360°00'10".
The sum should be mziIlrrn 360" t
23".
If a difference of more than
rt
20"
still remains after repeating these
procedures several times, adjust
as follows:
Note: Moving the reticle line effects
the distance measurement. Do
not move the reticle more than
20".
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