Two peg test is a surveying operation carried out to determine whether the levelling bubble and telescope line of sight are parallel objective peg test is a surveying operation carried out to determine if the leveling bubble (bubble axis) and telescope line-of-sight (line of collimation) are parallel. The main error is where the line of sight is not parallel to the horizontal line of collimation in this case your levels will not be correct a test for checking the level is known as the two peg test this test determines the amount of error and if an error occurs notify the technician (the level must be serviced.
Two peg level check 1 depending on the exercise area use pegs or a spray can to mark two points 2 the points should be set up at a distance of 40 metres apart 3 use pegs on grass or sandy soil and use a spray can to mark points on a hard surface 4 set up the level midway between the points 5.
Two peg test the two peg test is a very simple test which is used in the field to determine if the line of sight of the telescope is exactly parallel to the bubble tube this is one of the most important properties of a level and is required to be checked periodically the steps below are required to be followed to check this adjustment in a level. To run the test, put two pegs eg (pk nails, leveling turtles, etc) 100' apart from eachother place the level halfway between the two pegs take readings on both pegs and find the difference in elevation move the level 20 past either peg and take readings from both pegs find the difference in elevation again. The two peg test - free download as pdf file (pdf), text file (txt) or read online for free. Needed equipments for two-peg test are as follow: 1 level staff (2 units) 2 tripod (1 unit) 3 tapes (1 unit) 4 auto level (1 unit) 5 writing staffs 6 calculator 2 procedure: to run two-peg test, firstly: we should assign two points (a & b) on a land surface with distance of 50 meters and put the level staffs in each point.
Two peg test - report 1 1 soran university faculty of engineering civil engineering department two peg test student: sarchia khursheed group: e date: 20102015 supervisor: eng anwar jabbar introduction 2 2 all instruments are subject to errors the checking of the instrument (in this case level) is therefore important. The two-peg test is very simple, but provides a way to test the accuracy of a level, and if you know which screw to turn (for analog instruments) or menu to follow (for the digital level), you can adjust it to remove the error see specific instrument instructions for making adjustments.
A two peg test is a test for error within a surveying level this test gives a fairly accurate check for the amount of collimation error collimation error is the difference between what the level hairs in the scope say is level, and what is actually level.
The two peg test is a quick way that you can check that your automatic level and even a laser level is giving you accurate readings. Instruments how to do a two peg test with a level wwwtriginstrumentsconz 0800 500 460 step 3 move the instrument to aprox 3m from position. A test for checking the level is known as the two peg test this test determines the amount of error and if an error occurs notify the technician (the level must be serviced.
Do a two peg test with a level however you can do a test to see if it is out of calibrtation yourself, using this procedure step 1 in reasonably level terrain, mark out two rod positions (a and b) on stable surfaces about 30m apart and set up the instrument exactly. The corners of the prism r on the other hand must be counted one (corner), two (at the boundaries) and four (internal corner) as shown in figure 4. The two peg test is a very simple test which is used in the field to determine if the line of sight of the telescope is exactly parallel to the bubble tube this is one of the most important properties of a level and is required to be checked periodically the steps below are required to be.