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 Introduction: Checking of the instruments is important, because all instruments are subject to errors. And since most levels will have a collimation error , some method is required to check this to determine if the err or is within accepted limits. This is known as the two-peg test which should be carried out when using a new or dierent level for the rst time and at regular intervals after this depending on how much the level has been used.

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two peg testintroduction for engineering courses

Transcript of 31

Introduction:

Checking of the instruments is important, because all instruments are subject to errors. And since most levels will have a collimation error, some method is required to check this to determine if the error is within accepted limits. This is known as the two-peg test which should be carried out when using a new or different level for the first time and at regular intervals after this depending on how much the level has been used.