Section III: OPERATION UNDER USUAL CONDITIONS

TM 5-6675-329-13 & P

Section III: OPERATION UNDER USUAL CONDITIONS

2-4

ASSEMBLY AND PREPARATION FOR USE

To set up Surveying Level NA2-80 under usual conditions, proceed as follows:

Remove tripod head cover (Figure 1-3, item 1) and set up Tripod Assembly GST-40 with legs extended to a

comfortable height and lock. Tripod head plate (3) should be as horizontal as possible. Shoes (5) should be firmly

implanted in the ground.

Unfasten strap lock (Figure 1-4, item 5) from mating case strap hook (3) on transport case (1). Note how

Automatic Level NA2 (Figure 1-2) is positioned and secured before removing it from Carrying Case NA2-80 so that it can

be replaced properly after use. (Instrument lies upside down in Carrying Case NA2-80.)

Grasp Automatic Level NA2 with one hand and place it on top of tripod headplate (Figure 1-3, item 3). Turn

central fixing screw (2) of Tripod Assembly GST-40 with other hand so as to attach Automatic Level NA2 to tripod

headplate (3). Do not overtighten central fixing screw (2). Attach objective assembly sunshade (Figure 1-1, item 4)

stored in Carrying Case NA2-80 to objective housing (Figure 1-2, item 4). Surveying Level NA2-80 is now set up (see

CAUTION

Automatic Level NA2 should never be left on Tripod Assembly GST-40 without

being screwed to it.

To level instrument, turn three knurled footscrews (Figure 1-2, item 2) one at a time until bubble lies in center

of Circular Level (8). The line of sight is then automatically set by the internal compensator.

NOTE

Circular Level (8) bubble can be viewed through prism (9) directly above it.

The functioning of the internal compensator is checked by pushing pushbutton (7) located below telescope

eyepiece (6) while looking through eyepiece (6) at leveling staff (not supplied). After depressing pushbutton (7) leveling

staff image should swing smoothly away and then float gently back to its original position with respect to the horizontal

crosshair.

2-6