Dtf (Distance To Fault) Measurements - Keysight N9912A 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 20.
In this Chapter
How to make DTF Measurements ........................ 30
DTF Settings Table ............................................... 31
DTF Measurement (Format) ................................. 31
DTF Start and Stop Distance ................................ 31
Frequency Mode ................................................... 32
Coupled Frequency ............................................... 33
Cable (Correction) Specifications ......................... 33
Window Settings ................................................... 36
DTF Units .............................................................. 36
Calculated DTF Values ......................................... 36
About Alias Faults ................................................. 37
Optional settings
Markers ............................................................... 147
Limit Lines ........................................................... 156
Save Measurement Settings and Results .......... 162
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 (if
 The known length and cable type of the DUT. If the cable type is not known, then
1. Connect any necessary jumper cable or adapter to the FieldFox RF OUT port. Do
2. Press Preset then
3. Then Mode then CAT.
4. Then DTF.
5. Press Freq/Dist , then
6. Press Cal 5 and follow the Cal prompts. Learn all about Calibration on page
7. Disconnect any components or antenna that should NOT be measured and
30
possible).
the Cable Loss (dB/Meter) and Velocity Factor of the DUT are required.
NOT connect the DUT.
Preset
optionally set the Start Distance.
52.
connect a LOAD at the end of the DUT.
to return the FieldFox to the default settings.
and enter the length of the DUT. You can
Stop Distance
FieldFox User's Guide