Dtf (Distance To Fault) Measurements; Distance To Fault Measurements - Agilent Technologies FieldFox N9923A User Manual

DTF (Distance to Fault) Measurements

CAT Mode Distance to Fault (DTF) measurements are generally used to locate
problems, or faults, in a length of cable or transmission line. In this chapter, the
cable to be tested is referred to as the DUT (Device Under Test).
Settings that are NOT unique to DTF measurements are documented in the CAT
Mode chapter on page 19.
In this Chapter
How to make DTF Measurements ....................... 42
DTF Start and Stop Distance ............................... 43
DTF Units ................................................................ 44
Bandpass Mode ...................................................... 44
Cable Specifications .............................................. 45
Window Settings .................................................... 45
Alternate Sweep ..................................................... 48
DTF Settings Page .................................................. 49
About Alias Faults ................................................. 49
Optional settings
Markers .................................................................... 76
Limit Lines .............................................................. 82
Save Measurement Settings and Results ........... 86
Trace Math is NOT available in DTF Measurements.
How to make DTF Measurements
Before starting, you may need the following:
 Jumper cable or adapter to connect the beginning of the DUT to the FieldFox.
 LOAD with correct connector type and gender to terminate the end of the DUT
 The known length and cable type of the DUT. If the cable type is not known,
1. Connect any necessary jumper cable or adapter to the FieldFox PORT 1. Do
2. Press Preset then
3. Then Mode then CAT.
4. Then
5. Press Freq/Dist , then
6. Press Cal 5 and follow the Cal prompts. Learn all about Calibration on
42
(if possible).
then the Cable Loss (dB/Meter) and Velocity Factor of the DUT are required.
NOT connect the DUT.
Preset
Distance To Fault.
can optionally set the Start Distance.
page 51.
to return the FieldFox to the default settings.
Stop Distance and enter the length of the DUT. You
N9923A FieldFox User's Guide