Fluke 990DSL, Руководство пользователя

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990DSL
Users Guide
4-38
Leakage Stress Test Results
To run the Leakage Test, select the test on the POTS Toolbox and press
K
.
Figure 4-23 shows results from a Leakage Stress test that was conducted on a
faulty pair:
acy35s.eps
Figure 4-23. Leakage Stress Test Results: Faulty Pair
Note that the T-R resistance fault initially started at a reading of 140 kilohms,
but during the applied stress voltage its value decreased to 138 kilohms. This
reduction indicates the presence of a T-R short that has oxidized.
Under normal resistance fault testing, the T-R short would not be detected.
After stress testing, a fault of this type usually remains long enough so that you
can run an RFL test to determine its exact location.
1. Press
B
(
T-G
) to continuously stress the Tip-to-Ground leg.
2. Press
C
(
R-G
) to continuously stress the Ring-to-Ground leg.