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Using the right target is critical to get the correct result when measuring with a total station.
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To change target or edit the target list press on target icon in survey and stakeout pages.
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This open the following page.
Select a different target
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To select a different target tap on one of the available targets in the page.
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If the desired target is missing press Customize to change the available targets or press Offsets to create a custom target.
Customize favorite targets
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To customize the three targets to be selected press Customize.
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Then tap on the button until the preferred prism type appears.
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Press Stop to complete the procedure.
Targets constant
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In the Target type page it’s possible to check the constants of different types of prism and specify the constant to use for the “user” type of prism.
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Press Offsets to open the Target type page.
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Type: the target type. Change to Custom to customize the offsets for the user prism.
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Constant (mm): constant of the prism. This field is editable for Custom prism.
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Constant absolute (mm): absolute constant of the prism. This field is editable for Custom prism.
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Reflectorless (mm): offset applied to reflectorless measurements.
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Tape (mm): offset applied to tape measurements.
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Understanding Leica and absolute prism constant
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The prism constant is an important characteristic of the reflector.
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This constant, always given in [mm], is specific to the model and physically represents the constant difference between the measured value and the "exact" value.
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This difference will be cancelled during the measurements by entering an "additive constant" in the total station.
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There are two types of constants:
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Prism constant: for Leica prisms (usually in positive values).
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Absolute constant: for prisms of other manufacturers (usually in negative values).
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The additive constants, of non Leica prisms, are often given in the true zero prism system. Whereas the Leica prisms are given in the Hexagon TPS prism system.
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In order to switch from a system to another, we can use the following formula, that links these two constants:
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Leica prism constant = Absolute prism constante + 34.4mm
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Absolute prism constant = Leica prism constant – 34.4mm
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Reflectorless measurements
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To perform a reflectorless measurement select Reflectorless from the table.
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Select Laser pointer to enable the laser pointer.
Long-range measurement
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Press Prism LR to perform long range measurements.
Tape measurements
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Press Tape to perform measurements on reflective tapes.
Change target height
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To change the height of the target press Target height from the target page.
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Or press the target height box in the survey and stakeout pages.
