3.4.7 Delta Coefficient The Delta coefficient is used to determine the differences between two values. This difference may be constructed from within a test using the scope range. Or, you may use the overlay feature and determine the differences between points on two separate graphs within the same test setup. Select the Delta graph analysis tool. A green line is automatically drawn from the Start to Finish scope positions. Adjust the scope handles to the locations you want to determine the delta. You can determine the delta between markers and between a marker and a point of the graph without a marker. If using overlays, first specify the overlay function by pressing the single green bar above the Runs List. Next, select your two runs you want to compare. Next, select the Overlay analysis tool, then use the Point tool to measure the delta along the two graphs.
The green line shows the relationship between the two points where the delta is being calculated.
The scope range starts at the marker for D@Lmax. The Lmax marker is highlited showing it is an anchored result.
The second point has no marker since it was defined by simply moving the scope handle to the desired location. This position is identified in the scope as 19.764mm.
L3 Tensile test Finding the Delta between marker D@Lmax and a point on the curve
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