Fluke 990DSL, Руководство пользователя

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POTS Testing and Fault Location
The POTS Toolbox
4
4-37
Loop Devices Test Results
To run the Loop Devices Test, select it on the POTS Toolbox and press
K
.
Upon completion of the test, the tester displays a result screen that lists each
loop device and indicates whether or not it was detected on the test pair. A
Y
indicates that the device was detected, and an
N
indicates that the device was
not detected.
Leakage Stress Test
The Leakage Stress test is a continuous resistance test that uses a higher test
voltage than normal, in order to “punch through” a potential metallic wire fault
that has oxidized over time. During normal resistance testing, this type of fault
typically does not show up on a spare pair. However, it does gradually appear
under sustained application of C.O. battery voltage after being cut into service
as a supposedly “good” pair.
Setting Up a Leakage Stress Test
To set up a Leakage Stress test, select the test on the POTS Toolbox and press
D
(
Setups
). The test has one setup parameter, which is listed in Table 4-6.
Table 4-6. Leakage Stress Test Setup Parameter
Parameter Settings (default in bold)
Leakage Fault Pass Threshold 500 k
e