![]() 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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