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10.TARGET SIGHTING AND MEASUREMENT
A target can be automatically sighted using the Auto Pointing function or manually sighted by the operator using
the sighting collimator and telescope.
When Auto Pointing is performed, the image sensor on the instrument detects the
light beam reflected from the target (prism or reflective sheet target), the offset
between the target and telescope reticle is calculated by image processing, then
the angle measurement value obtained from the encoder is compensated. There
is a possibility that the target and telescope reticle are not aligned.
Caution
• The instrument emits a laser beam during Auto Pointing and Auto Tracking operation.
• 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.
• Detach the handle if the prism is located at the zenith.
"4.1 Parts of the Instrument Handle Detaching/attaching the RC Handle (Auto Tracking model)",
"4.1 Parts of the Instrument Handle Detaching/attaching the Standard Handle (Auto Pointing model)"
• Auto Pointing may take long time if the prism is located at the zenith.
• When sighting a prism located at the zenith manually, use optional accessory diagonal eyepiece (DE30).
"10.3 Manually Sighting the Target"
• If more than one prism is located in the field of sight during Auto Pointing, the prism closer to the reticle is
sighted. An operation error may occur and the instrument may not be able to find the prism depending on the
prism installation status or measuring conditions.
• A prism beyond glass cannot be searched because a measurement error occurs.
• If an obstacle blocks the laser beam path between the instrument and the prism, instrument cannot find the
target correctly.
• If strong light shines directly into the objective lens, measurement cannot be performed correctly.
• Use designated reflective prisms/reflective sheets for higher precision measurement. Make sure reflector
type and aperture/sheet size are set correctly.
"19.3 Observation Conditions - Reflector (Target)", "24. TARGET SYSTEM"
• The following table suggests what size target to use for different distances when performing Auto Pointing
with a reflective sheet target.
Distance
5 to 15 m
RS10 (10 mm)
5 to 30 m
RS30 (30 mm)
5 to 50 m
RS50 (50 mm)
10 to 50 m
RS90 (90 mm)
• It is recommended to use an appropriate prism for Auto Pointing and Auto Tracking measurement.
" Appropriate prism for Auto Pointing and Auto Tracking"
Target size
51
Offset
of X direction
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