Instrument Tips:
Angle accuracies
- 1/16" — equals 10 seconds (10")
- 1/8" — equals 20 seconds (20")
- 3/16" — equals 30 seconds (30")
- 3/8" — equals 1 minute (1')
Laser set up
All rotating lasers have what is known as a cone error, this usually equals +/- 1/16" per one hundred feet. Simply put, if you set the laser up and measure two points each 100 feet from the laser in opposite directions, their elevation would match and be within +/- 1/16" of the laser's height. So by setting the laser up in the middle of the job you would be more accurate than setting it up on one end.
Checking your automatic level compensator
- Level your instrument.
- Rotate the instrument until the objective lens is over one the leveling screws.
- While looking through the instrument, sight an object.
- While looking at the object, slowly turn the leveling screw under the objective
lens about 1/8 of a turn.
The cross wire should move up and then back to the object you sighted. - If the cross wire just keeps moving up and doesn't come back down, your compensator is damaged.
- If the cross wire does come back, repeat the procedure until it stops coming back.
Look at the circular level vial, the bubble should be half way out of the circle.
Turn the leveling screw in the opposite direction and the crosswire should come back.
