TDR Testing and Fault Location
The TDR Toolbox
6
6-11
Running a Test in the TDR Toolbox
With the exception of the TDR Auto-Test, all tests in the TDR Toolbox are
continuous tests.
To run a TDR Test, do the following:
1. From the
Main menu, press C(TDR) to display the TDR toolbox
(Figure 6-2).
2. Select the test that you want to run, then press K.
To stop a continuously running test, press K.
Saving TDR Test Results
For continuous tests that display a constantly 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 Δ
C automatically gives the
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.
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