Nikon NPL-632, Instruction Manual

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Field Station NPL-632 Instruction Manual 17
Preparation 2
Leveling
When you level the instrument, you make the vertical axis of the instrument exactly
vertical. To level the instrument, use the plate level.
To level the instrument:
1. Loosen the upper plate clamp.
2. Rotate the alidade until the plate level is
parallel with any two of the leveling screws (B
and C).
3. Use leveling screws B and C to move the
bubble into the center of the level.
4. Rotate the alidade approximately 90
°
.
5. Use leveling screw A to move the bubble into
the center of the level.
6. Repeat Step 1 through Step 5 to center the
bubble in both positions.
7. Rotate the alidade 180
°
.
8. If the bubble in the plate level remains
centered, the instrument is level. If the bubble
moves off center, adjust the plate level. For
detailed instructions, see
Checking and Adjusting the Plate Level, page 146 .
Sighting
When you sight the instrument, you aim the
telescope at the target, bring the target image into
focus, and align the image with the center
crosshairs of the reticle.
To sight the instrument:
1. Adjust the diopter:
a. Aim the telescope at a blank area, such
as the sky or a piece of paper.
C
WARNING – Never look at the sun through the telescope. If you do, you may damage or lose
your eyesight.
C B
A
1
C B
A
2
Center
crosshairs
Center
crosshairs