Topcon OS-103 - Two-distance Offset Measurement

17. OFFSET MEASUREMENT
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By measuring the distances between the target point and the two offset points.
Install two offset points (1st target and 2nd target) on a straight line from the target point, observe the
1st target and 2nd target, then enter the distance between the 2nd target and the target point to find
the target point.
• It is possible to make this measurement easily using the optional equipment: the 2-point target
(2RT500-K). When using this 2-point target, be sure to set prism constant to 0.
"25. OPTIONAL ACCESSORIES"
How to use 2-point target (2RT500-K)
• Install the 2-point target with its tip at the target point.
• Face the targets toward the instrument.
• Measure the distance from the target point to the 2nd target.
• Set the prism constant to 0mm.
17.3 Two-distance Offset Measurement