Viavi OneExpert DSL User Manual page 189

c
6 Touch Start.
The test runs then displays the results. The results for the specific
fault appear.
The OneExpert DSL assumes that the fault is on the red lead. If the
fault is not on the red lead, it will automatically flip Tip (A) and
Ring (B) and run the test again. Thus, your screen may show
swapped leads.
7 To save the results to a report, use the Tray menu
on page
8 To learn what your results mean, see
Results".
Locating a cable fault using the RFL is complete.
November 2015
In order to get the desired results make sure the following guide-
lines are met:
- The faults must occur at the same physical point on the pair
to the same place or reference. For example both wires are
faulted to the shield at the same location.
- The fault ratio is 2:1. The fault size on one wire vs. the fault
on the other is twice as large. For example one wire has a
10K ohm fault and the other has a 20K ohm fault.
- The larger fault value should be at least 100 times greater
than the loop ohms of the pair under test. For example if
the loop ohms is 100 then the larger fault value should be >
10K ohms.
The K-Test is a two step measurement that starts with the far
end open and does a series of resistance measurements to
determine the faults present and if it is possible to solve the
resistance to fault. Then with the far end shorted, the measure-
ment finishes and calculates the results. It can be run manually
or use a FED to automatically provide the correct conditions for
the test.
49).
OneExpert DSL User's Guide
"RFL"
22052280, Rev 006
Chapter 12 Copper Testing
Locating faults using RFL
("Saving a report"
in Chapter 14 "Test
Page 165