Vector Network Analyzer
R&S
®
FPC
174User Manual 1178.4130.02 ─ 07
Because of its sensitivity by first measuring in the frequency domain and subsequent
IFFT, the measurement is able to locate faults in a cable accurately. To keep this accu-
racy, the R&S FPC also accounts for any attenuation that occurs over distance in a
cable.
If you are measuring the cable only, make sure to terminate the other end into a load.
For more information about configuring DTF measurements, see Chapter 18.1.6, "DTF
Configuration", on page 177.
Measuring the distance to fault
1. Connect the DUT to the R&S FPC.
Make sure to terminate the cable.
2. Define the frequency parameters for the measurement.
For more information, see Chapter 18.2, "Frequency Configuration", on page 179.
3. Press the "Meas" key to enter the measurement menu.
4. Select the "Distance To Fault" menu item to start the measurement.
5. Calibrate the cable loss measurement.
For more information, see Chapter 12, "Calibration", on page 54.
6. After calibration, start the actual measurement (single sweep or continuous
sweep).
Displaying the DTF list
The DTF list shows the results of the distance to fault measurement in numerical form.
1. Press the "Meas" key to open the measurement menu.
2. Select the "DTF Config" menu item to open the DTF configuration menu.
3. Select the "DTF List" menu item.
The R&S FPC displays a numerical result display instead of the diagram. The
result display contains the peaks that were found during the measurement.
The DTF list contains the following information.
● "Peak": Shows the peak that the results refer to.
● "Distance": Shows the distance from the measurement plane to the peak.
● "Return Loss": Shows the return loss of the peak.
To limit the information in the list, you can define a threshold for the DTF list, so
that only peaks above a certain level are included in the list.
4. Select the "DTF List Threshold" menu item to define a threshold level.
The R&S FPC now only shows the peaks that are above the level you have
entered.
Measurements and Result Displays
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