Sigma LBA-714PC, LBA-710, LBA-300, LBA-712, LBA-708, LBA-700 Peak/Centroid Scatter Plot and Histogram

Example: If the user has collected samples [1-1000] and the Sample limit it set to 100, samples [900-1000] will be the only samples visible in the strip chart. Statistical results will be computed using all the samples [1-1000].

3.2.9.2.2Samples

The Samples indicator shows the total number of samples collected.

3.2.9.2.3Check Boxes

The Check Boxes allow the user to specify what results items are to be graphed on the strip chart. One or all of the following may be selected:

Centroid X

Centroid Y Peak X Peak Y Radius

3.2.9.2.4Radius Relative to:

The Radius Relative to control modifies the display of radius information. The radius is referenced from an Origin set up in the LBA-PC or from the continuously calculated Average Centroid position.

3.2.9.2.5Strip Chart Zooming

All strip chart data is plotted on the same horizontal and vertical scale. This situation will cause traces that vary greatly along the vertical axes to dominate the vertical scale. Traces that have small vertical fluctuations will show up as flat lines. In order to see small details the user must stop or pause the data collection and drag a zooming box around the region of interest. To do this, start in the top left, drag a box spanning downward and to the right until the region of interest is selected. More than one zoom operation may be performed to achieve the desired detail.

Zooming out can only be done once. The plot will return to full zoomed-out mode. Zooming out is accomplished by dragging a box from the bottom right back to the top left. The size of the zoom-out box does not matter because all zoom out operations return the plot to the full view.

Note: The direction of the zoom operation (in or out) is controlled by the direction the box is drawn, down and to the right to zoom in and up and to the left to zoom out.

3.2.9.3Peak/Centroid Scatter Plot and Histogram

There are two ways to use the Scatter Plots in the Beam Stability window. One is to test stability from the standpoint of spatial dimension using units such as millimeters or microns. The other is

Operator’s Manual	89	LBA-PC
Doc. No. 10654-001, Rev 4.10