Symmetricom 5115A, Руководство по эксплуатации и обслуживанию

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38 5: Configuring Data Displays
information on how to do so see “5.1.5 The Spur Table” on page 42.
5.1.3 Setting Up a Test Mask
Test masks display a visual fail level reference line for phase noise data. A test mask is a set of line
segment end points that are scaled as data points are. Line segments are drawn between the points
after scaling. Note that a test mask must contain at least two points before a line segment appears
on the plot.
Figure 11: Example Test Mask for Phase Noise
The PNTS can store five different phase noise test masks. One of them is considered to be the
current test mask. The current test mask changes as masks are loaded and saved. The current mask
is highlighted in the editor’s load and save softkey interfaces. It is marked with a dot in the mouse
popup menu. Loading, saving and editing of test masks is done with the test mask editor.
To access the test mask editor:
1. Select the Phase Noise Plot (see “3.1.1 Navigation” on page 12 for details).
2. Press Config Phase Noise .
3. Press Test Mask .
4. The Test Mask Editor is activated and displays the points in the current test mask. The
current test mask is empty when the phase noise test set is shipped. Figure 12 on page 39
shows the test mask editor for the test mask shown in Figure 11 Example Test Mask for
Phase Noise.
The red dotted line
is a test mask.