Viavi OneExpert DSL ONX-580, Руководство пользователя

Страница: 199 / 282

OneExpert DSL User's Guide
22052280, Rev. 015 April 2019
Chapter 13 Copper Testing
199
Separate Pair RFL test
The Separate Pair RFL (available on the ONX-580P only) works just
like the Single Pair RFL except it uses an additional known good
wire attached to the blue (A1) lead for improved accuracy.
RFL K-Test
The RFL K-Test is typically used to test for fault location when there is no “known good”
(reference) pair.
Use this test to find the approximate distance to faults on a single
pair of wires when both wires have a fault on them and there is no
known good spare pair or wire to use as a reference (when Single &
Separate Pair RFL cannot be used). To get the desired results make
sure the following guidelines 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 measurement finishes and calculates
the results. It can be run manually or use a FED to automatically provide the correct
conditions for the test.
1. Press Start .
2. The test runs then displays the results. The results for the specific fault appear.