Inspecting the EDM of the total station

 permanently mark four runs within the range typical for the user (e.g. between 20 m and 200m 

Using a new distancer, or one that has been cail- brated on a standard baseline, measure .these distances there times. The mean values

corrected for atmospheric influences (refer to the user manual can be regarded as being the required values. Using there four runs, mea- sure with each distancer at least four times per year. provided that there are no systematic errors in excess of the expected measuring uncertainty, the distancer is in order.

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