Lab EDM Testing - Lab EDM Testing Purpose This lab will...

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Lab EDM Testing Purpose: This lab will teach the students to understand the basic principles of Electronic Distance Measuring using an electro-optical EDM on a total station, and EDM calibration techniques. 1. Determine the proper ppm correction of the EDM. Obtain the "ppm chart" for your total station. On the day of your lab, find the barometric pressure in inches or mm of Hg using the Internet, evening news, etc. Also determine the air temperature in the same units required for the chard (degrees F or degrees C). Use the chart to determine the atmospheric ppm correction. 2. Determine the EDM total offset constant using a baseline of unknown length. (TOC) Find a level area and mark three points A, B, C on a straight line. Set the instrument’s TOC (instrument constant) to zero. Measure AC and AB using three tripods with tribrach’s erected over the three points with the instrument at A. Leave tripods and tribrach’s in place and place the instrument at B and prism at A. Measure BA and BC.
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