Target Sighting - Sokkia SRX1 Operator's Manual

11.TARGET SIGHTING

The target can be automatically sighted using the Auto Pointing function or manually sighted by the
operator using the peep sight and telescope. The Auto Pointing function automatically sights the target
and does not require you to focus the telescope. The SRX analyses the image of the prism in the field
of view and moves the telescope to sight the center of this prism.
•The search method can be set.
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"12.1 Auto Tracking Settings"
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Caution
• The instrument emits a laser beam until the center of the prism is sighted.
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• Auto Pointing can only be performed when a prism or sheet is used as the target. For reflectorless
measurement, the target must be sighted manually.
• Use reflective prisms/reflective sheets from Sokkia for higher precision measurement.
• Auto Pointing cannot be performed if the prism is located at the zenith. In this case, manually sight
the target.
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"11.3 Manually Sighting the Target"
• If more than one prism is located in the field of sight during Auto Pointing, an operation error will
occur and the SRX will not be able to find the target.
• A prism beyond glass cannot be searched because a measurement error occurs.
• If an obstacle blocks the laser beam path between the SRX and the prism, SRX cannot find the
target correctly.
• If strong light shines directly into the objective lens, measurement cannot be performed correctly.
• Position the prism in alignment with the objective lens. In short distance measurement especially,
make sure to align the prism with the objective lens (within 10 to 15°) to obtain the correct result. A
prism with a prism constant of -40mm can eliminate the error caused by tilted prism.
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Aspect of the 360° Prism
The 360° Prism should be set up so that a pair of hexagonal points on the rubber flanges of the
prism are aligned with the sighting direction of the SRX (see the diagram below).
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