Surveying Revision

What causes parallax error during levelling?

• Incorrect tripod height

• Improper setting of focusing screw and eyepiece

• Damaged levelling staff

• Compensator malfunction

How can parallax error be detected?

• By moving the telescope side to side

• By checking the staff reading from a distance

• By moving the eye across the eyepiece and checking if the reading changes

• By tilting the tripod head

What is the correct method to eliminate parallax error?

• Adjust the foot screws

• Use a plumb bob

• Adjust the eyepiece until the cross hairs are in focus

• Replace the levelling staff

How can you check if the compensator in an automatic level is not working?

• Shake the levelling staff

• Shake the levelling staff

• Gently tap the telescope or use the compensator check button

• Replace the battery

What is the appropriate solution if the compensator is found to be defective?

• Clean the eyepiece

• Replace the tripod

• Professional calibration

• Use a manual level instead

What is a collimation error?

• Damage to the tripod shoes

• Staff readings taken in poor lighting

• Line of sight not being horizontal

• Incorrect eyepiece setting

Which test is used to detect a collimation error?

• Drop test

• Two-peg test

• Staff rotation test

• Line test

What does misclosure error indicate?

• Telescope alignment issue

• Incorrect foot screw setting

• Mismatch between measured and known RL

• Damaged tripod

What can cause a zero error in the staff?

• Dirty cross hairs

• Loose or damaged base or extension lock

• Incorrect bubble setting

• Tripod not level

How can tripod defects be detected?

• Listening for strange sounds

• Testing the eyepiece focus

• Checking the tripod head, shoes, and leg tightness

• Weighing the tripod