Nikon DTM-502 Series Instruction Manual page 165

2) Adjustment
There are two steps in the calibration program. Mostly, going through the first
step only should be enough since the trunnion axis by itself is finely adjusted
mechanically.
To make a serious adjustment on the trunnion axis error compensation, you can
proceed to the second step and go through three sets of observations.
• To set the parameters for trunnion axis error
compensation, you need to establish two
targets whose horizontal distances from the
instrument are at least 30 meters. The first
target should be placed on the horizontal plane
and the second should be more than 30
degrees above the horizontal plane.
• You must complete three sets of F1/F2
observations to two points before you set the
trunnion axis compensation parameter.
• Even if you go through the second step, larger than 30" of trunnion axis error
parameter cannot be stored. If this happened, the instrument needs a
Press the [MENU] and [7] key to enter the
calibration screen.
First step
Take a F1 measurement to a target on the horizon
and press the [ENT] key.
4
Vertical angle is shown in "V0 dir= Horiz" setting
in this function.
VA1: Face-left vertical angle (tilt-off value)
HA1: Face-left horizontal angle (tilt-off value)
X1: Face-left X axis tilt value
Y1: Face-left Y axis tilt value
When you sight the target whose VA is more than
three degrees, a warning sign brinks at the third
line.
4-4
nd
2 Target
>30
st
1 Target
>30m(100ft)