Using a Graduated Staff
5 very easy steps to setting-up and using the staff
1. Go to the position indicated by the surveyor.
2. Extend the staff, locking each section in place at its full extension, to make the staff reach above the height at which the level is.
3. Hold it vertically on the spot required, using the bubble on the back to check it is vertical.
Alternatively, sway the level back and forward slowly.
4. Ensure the face of the staff with large writing on it is facing the level.
5. Keep your hands off the front face of the staff.
Recording Results
Results are taken in metres and millimetres; never centimetres, inches, etc.
Using a Graduated Staff
Surveyor
Graduated Staff
The surveyor will aim the telescope of the level at the staff and adjust the focus until the scale on the graduated staff can be clearly seen.
A measurement is then read-off from the cross-hairs of the eyepiece and recorded.
With a laser level, the visible laser line will strike the staff and a measurement can be read-off and recorded by the staff-bearer.
Most Optical Levels have a magnification of around x10, which makes the staff appear much nearer and larger than it would normally seen.
Even at distances of 20m or so, it’s fairly simple to read off a measurement to an accuracy of ±2mm.
The next step is to transfer this level to other key points on the project and make adjustments to suit the plans.
Measurement reads 1m from the scale, with the cross-hairs halfway between 1.03 and 1.04m in the white section of the ‘E’, so the actual measurement is 1.035m.
Reading Graduated Staff
