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990DSL
Users Guide
Starting and Stopping a Test in the TDR Toolbox
Unless otherwise instructed, use the following procedure to start a test in the
TDR toolbox.
1.
From the
Main
(Figure 6-2).
2.
Select the test that you want to run, then press K.
To stop a running test, press K.
Saving TDR Test Results
For those tests that display a continuously updated "live" trace, you can save a
snapshot of the trace. To do this, press L. Then, follow the prompts for
naming the file and saving it. For details, see Chapter 7 "Saved Test Results".
Pair 1 Test
The Pair 1 test is the basic TDR "auto-ranging" test tool. In this test, a launch
pulse is continuously applied to Pair 1, and the resulting reflections are
continuously displayed. The resulting waveform is a single trace on the screen.
The Pair 1 test result screen is similar to that shown in Figure 6-1 except that
the CopperPro does not display pair status information. The launch cursor
marks the beginning of the launch pulse. The reflection cursor marks the
approximate start of the largest reflection, and ∆
approximate distance to the reflection.
The Pair 1 test uses pre-selected VOP and filter settings. However, you can
change these settings in real time after the test begins. The test automatically
searches for reflections, initially changing pulse-widths and vertical and
horizontal scales to present the clearest possible picture of the largest
reflection.
6-12
menu, press C(
TDR
) to display the TDR toolbox
automatically gives the
C
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