Corrections and Adjustments TCA 1800

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Corrections and AdjustmentsTCA 1800
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Errors Present in TCA

• (l,t) Dual Axis Compensator Index Error
• (i) Vertical Index Error
• (c) Line of Sight Error
• (a) Tilting Axis Error
• (ATR) Target Recognition Axis Error

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These Errors Can Change Over Time and With
Temperature ...
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Therefore Should be Redetermined

• Before the First Use
• Before Each Precision Survey
• After Being Transported Over Long Distances
• After Long Periods of Work
• Change of Temperature gt 20 degrees C

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Dual Axis Compensator Errors

• This Determines the Error in the Longitudinal (l)
  and Transverse (t) Compensators
• If the instrument is to be Leveled without
  Turning the Alidade, this procedure must be
  conducted periodically

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Dual Axis Compensator ErrorsPage 2

• Acclimatize the Instrument
• Level the Instrument
• Activate the Calibration Procedure
• Select ltCALgt from the Main Menu
• Press ltF1gt (l, t)
• Follow Prompts

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Vertical Index Error

• Zero Point Error of the Vertical Circle in
  relation to the Vertical Axis
• Setup and Level the Instrument
• Setup a Target at about 100 m
• Make sure that the target is within 9 degrees of
  the horizontal plane

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Vertical Index ErrorPage 2

• Activate the Calibration Procedure
• Select ltCALgt from the Main Menu
• Select ltF2gt (i)
• The Dual Axis Compensator is automatically turned
  off for the process
• Follow the Prompts

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Horizontal Collimation Error

• This is the Error in the Line of Sight as it
  deviates from the line perpendicular to the
  Tilting Axis
• Setup and Level the Instrument
• Setup a Target at about 100 m
• Make sure that the target is within 9 degrees of
  the horizontal plane

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Horizontal Collimation ErrorPage 2

• Activate the Calibration Procedure
• Select ltCALgt from the Main Menu
• Select ltF3gt (c)
• The Dual Axis Compensator is automatically turned
  off for the process
• Follow the Prompts

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Tilting Axis Error

• Deviation of the Tilting Axis from the
  Perpendicular of the Vertical Axis
• Setup a Target at about 100 m
• The Target must be positioned at least 27 degrees
  above or below the horizon

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Tilting Axis ErrorPage 2

• Activate the Calibration Procedure
• Select ltCALgt from the Main Menu
• Select ltF3gt (a)
• The Dual Axis Compensator is automatically turned
  off for the process
• Follow the Prompts

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ATR Collimation Error
To be discussed during the ATR Topic
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