Andrew 9.3-Meter ESA manual Theodolite Centering Step Theodolite Height Adjustment

Theodolite

Centering

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Theodolite Height

Adjustment

Step 1

Step 2

Step 3

Step 4

Refer to Figures 38 and 39. Centering of the theodolite is performed using the X-Y translation stage. This device has 2 sets of micrometer adjustments and 2 sets of long locking adjustment screws which are opposed at 90°.

During initial adjustment, ensure that the long screws are unscrewed counterclockwise to provide free movement.

Note: The screws will be utilized later to lock the device in place after the centering pro- cedure is complete.

Refer to Figure 38. Centering is performed by focusing the theodolite on the intersection of the brass rod holder and the reflector skin.

Ensure theodolite center axis is in line with the adjustable axis of the X-Y translation stage. Focus and adjust the theodolite elevation adjustment until the edge of the rod holder is sighted. Note and record this reading as Tl. Repeat this procedure 180° apart and record the new reading as T2. Add Tl and T2 and divide by 2. Record this number as T3. Adjust the elevation axis angle of the theodolite to T3. Using the micrometer adjustment of the X-Y translation, move theodolite until the crosshair is focused to the edge of the rod holder.

Repeat the above procedure for the other axis of the X-Y translation stage 90° opposite to the first one.

Repeat steps 4 and 5 until the theodolite crosshair focuses to all 3 rod holder edge loca- tions within 15 seconds.

Refer to Figure 39. The height adjustment of the theodolite is performed utilizing the precision lift assembly. This device can lower or raise the theodolite to the desired height by rotating the large rim located at the center of the upper body of the device.

Upon completion of the leveling and centering procedure, the theodolite must be adjust- ed in-line with the scribe line on the alignment stick.

Adjust the elevation angle of the theodolite to exactly 90°, 00’ and 00”. With the theodo- lite set to this angle, focus to the scribe line on the alignment stick and make any up or down adjustment as necessary using the lift assembly. Be careful not to rotate torque tube when turning the precision lift.

Move the alignment stick 180° and check if the theodolite is lining up with the scribe line. Repeat this procedure with the diagonal stick locations. Repeat theodolite leveling, centering and height adjustment procedures to achieve calibration specifications, per Table 2.

Notice

The above described sequences must be followed in order to properly calibrate the theodolite to the reflector assembly. Deviation from the above procedures and sequence will make it more difficult to calibrate the device and may result in incorrect alignment of the reflector panels.

42 Installation Procedures