7.5.2. To orient the range finder by using the reference directional angle, proceed as follows:
-Binocular the range finder on the reference point whose directional angle has been known;
-rotate the azimuth dial to set the reference directional angle;
-turn the clamping handle to lock the azimuth dial in position. With the range finder thus oriented, the measurements are taken from the location point relative to the directional angle of the object (reference object).
7.5.3. For the magnetic orientation of the range finder, proceed as follows:
-Unscrew the plunger knob all the way out to release the magnetic needle of the compass;
-Turn the AI about the vertical axis to obtain precise alignment of the index mark of the circle with the magnetic needle;
-Operate the azimuth dial to set the magnetic azimuth index correction as specified in Section "Basic Specifications" 4 of
the present Operating instructions.
When using the compass to orient the range finder, bear it in mind that the nearby objects of iron or steel affect the indexing accuracy of the magnetic needle. See that motor vehicles, bulldozers and such like objects are at least 10 m away,
7.6.To check the range finder for proper operation when using the AI and the tripod:
- Check the AI zero elevation reference (ER "0");
- Check the AI compass.
-
ER "0" is the setting of the elevation scale that corresponds to the horizontal position of the range finder Binocular axis.
7.6.1.To check the zero elevation reference, proceed as follows:
-Stick a stake 50 to 100 m away from the unit and mark it with the range finder objective height above the ground level;
-Binocular the reticule
-Swap the range finder and stake positions, and apply another mark to the stake in accordance with the new height of the range finder objective;
-Binocular the
-Find the ER "0" from the formula:
A1 + A2
ER "0" =
2
The A1 and A2 values are reckoned in with their respective signs.
If the ER "0" value is other than zero, the respective correction is to be taken into account while operating the range finder. The error value is subtracted from the elevation measurement if on the positive side, and added if negative.
7.6.2.To check compass, set up the AI for operation. Then, check the sensitivity and balance of the needle.
For the purpose proceed as follows: - Level the AI;
- Encage the needle;
- Unbalance the needle by using a knife, screwdriver and the like.