DSP-100/2000
Users Manual
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gc21c.eps
Figure 4-3. Example of a TDR Plot (Twisted Pair Results)
Table 4-6. Items on a TDR Plot (Twisted Pair Results)
Item Description
1 The cable pair relevant to the results.
2 The peak value as reported on the results screen.
3 The distance along the cable 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 cable as reported on the results screen.
5 The percentage of reflected signal relative to the size of the TDR test signal. Positive values
indicate locations on the cable where the impedance is higher than the cable’s characteristic
impedance. Negative values indicate locations on the cable where the impedance is lower
than the cable’s characteristic impedance.
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.
Single Test Results for Twisted Pair Cable
The Single Test results for twisted pair cable are identical to those displayed by an
Autotest, with exceptions noted in the following paragraphs.
Tests not required by the selected test standard produce a Warning result when
measured values exceed the test’s limits.
