Optical Plummet - Sokkia im-101 Operator's Manual

PROCEDURE Check 2: Vertical and horizontal reticle line positions

• Perform check in weak sunlight and no scintillation.
• "Tilt crn" should be se to "Yes (H,V)" and "coll.crn" to "Yes" in <Obs. condition> while performing checks.
1. Carefully level the instrument.
2. Install a target at a point about 100 m in the horizontal
direction from the instrument.
3. While the OBS mode screen is displayed and the telescope
is in Face 1, sight the center of the target correctly and read
out the horizontal angle A1 and the vertical angle B1.
Example: Horizontal angle A1=18° 34' 00"
Vertical angle B1
4. While the telescope is in Face 2, sight the center of the
target correctly and read out the horizontal angle A2 and the
vertical angle B2.
Example: Horizontal angle A2=198° 34' 20"
Vertical angle B2
5. Do the calculations:
A2-A1 and B2+B1
If A2-A1 is within 180°±20" and B2 (B1 is within 360°±40",
adjustment is unnecessary.
Example: A2-A1 (Horizontal angle)=198° 34' 20"- 18° 34' 00"
B2-B1 (Vertical angle) =269° 30' 00" + 90° 30' 20"
If the difference is large even after repeating the check 2 or
3 times, make sure that checking and adjusting of "35.2 Tilt
Sensor" and "35.3 Collimation" are completed.
If the results remain the same, have our service
representative perform the adjustment.

35.5 Optical Plummet


• Be careful that the tightening tension is identical for all the adjusting screws.
• Also, do not over-tighten the adjusting screws as this may damage the circular level.
PROCEDURE Checking
1. Carefully level the instrument and center a survey
point precisely in the reticle of the optical
plummet.
=90° 30' 20"
=269° 30' 00"
=180° 00' 20"
=360° 00' 20"
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35. CHECKS AND ADJUSTMENTS