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5.3. Angular Mount (Fig. 4) is intended for mounting rangefinder
on a tripod, aim the rangefinder to the target and measure the
azimuth and elevation values. The main part of the Angular
Mount (AI) is body 15, which incorporates the elevation and
azimuth worm-gear drives.
Use adjustment knobs 1 and 7 for the fine tuning of the
rangefinder. To perform initial tune-up, turn the unit through the
desired angle. Read the angles read on azimuth circle 14 and
scale 5. The wheels provide accuracy of 1/10 of a division.
Lenses 6 and 10 make the reading easier and more accurate.
Azimuth circle 14 is set to zero with knob 11, which should be
locked in this position. The horizontal adjustments are made on
the Angular Mount by using level 13. Magnetic meridian
orientation is achieved with the compass 8.
The rangefinder is fixed on the guides of bracket 3 of the AI,
and secured there with lever 2. By rotating the nuts 9 you adjust
retainer 4 of the clamping assembly.
The AI is installed on the tripod through the ball mount 12.
5.4. The tripod mount (Fig.5) is designed to adjust the height of
the rangefinder and Angular Mount as required for the particular
aiming position. The tripod consists of three telescoping legs 3
assembled on top in common base 2. Each leg can be deflected
independently. The AI is fixed to the tripod through mounting
head 1.
10.6. Maintenance Servicing Procedure.
10.6.1. To clean the contacts in the battery section, wipe the
contacts several times with cotton wool moistened with alcohol.
10.6.2. To remove dust and dirt from the optical surfaces, use the
brush 23 and clean cloth 7 supplied in the individual SPTA set
(see Fig. 6).
To remove greasy stains from the optical surfaces, do the
following:
- wind some cotton wool around one end a wooden stick;
- moisten the cotton wool with an alcohol and ether mixture (1:1)
and gently shake the stick to remove excess mixture;
- wipe the glass surface several times with the cotton wool,
avoiding contact with the frame;
- change the cotton wool and move the stick end spiral style from
the center towards the periphery to wipe the surface clean;
- while cleaning, watch that the mixture does not stain the frame,
for it may dissolve the sealing mastic, causing leakage or
ungluing of the lenses.
10.6.3. The dehydrator case should be filled with fresh silica gel
in a closed room. Under the field conditions, replace the silica
gel when the weather is dry and calm. Never keep the case with
fresh silica gel open for more than 1 or 2 minutes.
To change the silica gel, proceed as follows:
- prepare fresh silica gel 13 (see Fig. 6);
- unscrew the cover of the dehydrator case with the help of
wrench 9 (Fig. 6);