4-8 Taking Measurements and Analyzing Data
Figure 4-8: Live Video Display Showing the Descending Stylus and Its Shadow
After the stylus tip contacts the sample surface, it begins to scan over the surface features. The Live
Video Display shows a real-time image of the stylus along with a measurement trace of the surface in
the Data Aquisition window to the right (see Figure 4-8). It also provides the vertical and horizontal
distances between the cursor/trace intercepts and the distances from the vertical and horizontal “zero”
grid lines.
NOTE – If your system includes the 3-D Mapping package, or if the scan is set for Hill or
Valley, the process described above is somewhat different. For example, during a
measurement with the 3D Mapping package, a real-time picture of the sample appears during
data collection (see Figure 4-9).
After the scan measurement is complete, the Data Analysis Display appears (see Figure 4-10). The
surface features encountered by the stylus are represented as a two-dimensional profile. To the right,
the output display shows a list of the scan parameters along with any user-requested analytical
results. If you have created and activated a database, that database appears beside the Data Analysis
display (see Figure 4-25
).
At the end of the scan measurement, the tower and stylus automatically move back to their starting
positions, and the system is immediately ready for the next measurement.
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