In the example left, you would enter 0.016 feet for standard error, and the same 3 ppm.Īngle Accuracy - The Angular Accuracy = 2 x (DIN 18723) / Square Root of the Number of Pointings. Remember, if your project units are set to feet, you have to convert any millimeter rating to feet. Say for example your EDM is rated as plus or minus 5 millimeters, and plus or minus 3 ppm, you would enter the value 0.005 meters (assuming your data is in meters) in the distance standard error field previously described, and the value 3 in the ppm field. A value entered here represents the proportional distance measuring error of an EDM in parts per million. Here is also an article which may be of use to you.ĭistance PPM - The actual standard error used for the distance observation is made up of two parts, the constant and the proportional (distance times ppm).
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