Running Individual Tests
The HDTDR Test
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1 The cable pair relevant to the results.
2 The peak value as reported on the results screen.
3 The distance along the cabling under test. The 0 at the left of the scale represents the
location of the main test tool.
4 The distance to the end of the cabling as reported on the results screen.
5 The percentage of reflected signal relative to the size of the HDTDR test signal. Positive
pulses indicate locations on the cabling where the impedance increased. Negative pulses
indicate locations on the cabling where the impedance decreased. Bi-polar pulses usually
indicate connectors.
6 The Cursor Readout shows the location and the reflection percentage at the cursor’s
position. Use L R to move the cursor left or right.
7 Use D U to change the maximum distance of the horizontal scale.
8 Toggles the vertical scale from 100% (1X) to 25% (4X).
Figure 4-3. Example of an HDTDR Plot (Twisted Pair Results)
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