| se dealing with test equipments know well about | | | | taken as benchmark for adjustment. |
| calibration. It is the checking or adjusting an | | | | - Now shift the auto level to point D which is L/10 |
| equipment- by comparing it with a standard- for | | | | (L is the length of point A to point B). |
| getting accurate measurements. Auto level is one | | | | - Read the nearest staff and write down the |
| of the many survey instruments that needs | | | | value. Add this value with the difference of BS |
| calibration. Here is a step by step instruction guide | | | | and FS which you got in the step 2. |
| on how to calibrate auto level! If you want to do | | | | - Now use screw to loose and tighten bottom and |
| it yourself, this guide will help you in your auto | | | | up screw. Adjust slowly- if you loose top screw |
| level calibration. | | | | then tighten bottom screw and read the staff to |
| - Open the cover of auto level by unscrewing the | | | | get the Actual value. This way your |
| top, bottom, left and right screws. If you only | | | | calibration is complete and you get the perfect |
| want to collimate (adjust accurately the line of | | | | value or a value that has a difference of 1 mm. |
| sight) auto level, then you have to adjust only top | | | | - After your auto level calibration is done, get |
| and bottom screw. | | | | back the alignment. Go back to center of point A |
| - After opening the cover, set the auto level in | | | | and B. Check the reading again. Now you should |
| the center of 2 staff (having approx length of | | | | get the perfect reading. |
| 60m) and get the reading of Backsight (BS)-point | | | | Once you have calibrated your auto level, you will |
| A and foresight (FS)-point B. Ensure that the | | | | be using it in the field. For properly using as well as |
| instrument is well leveled before reading. This | | | | checking auto level, read How to Use an Auto |
| difference of BS and FS you get by doing this is | | | | Level? It will also give you some tips on caring |
| without collimation and the reading should be | | | | and maintenance of auto levels. |