Fluke DSP-100, DSP-2000 user manual TDR Results Screen, TDR Plot Screen

Running Individual Tests 4

The TDR Test

TDR Results Screen

When the TDR test is complete, the TDR results screen appears. Table 4-5 describes the items on the screen.

Table 4-5. Items on a TDR Results Screen (Twisted Pair Results)

Item

Pair

Distance

Description

The cable pair relevant to the results. Not shown for coaxial cable results.

The first distance is the measured distance from the test tool to the end of the cable. The second distance, if shown, is the distance from the test tool to the beginning of the largest anomaly that caused a reflection greater than the limit defined by the selected test standard.

Peak

#View Plot

The percentage of the test signal reflected at the peak of the anomaly.

Press to see a plot of the locations and reflection percentages of the impedance anomalies detected.

Note

It is possible for impedance anomalies to be detected when testing from one end of the cable, but not from the other end. This discrepancy is caused by attenuation of the signal reflections returning from the anomaly.

TDR Plot Screen

To view the TDR plot for a cable pair, use DUto highlight one of the pairs; then press #View Plot to see the plot screen for that pair. Figure 4-3 shows an example of a TDR plot and Table 4-6 describes the items on the plot.

4-11