Fluke 990DSL, Руководство пользователя, Страница: 114 / 242

990DSL
Users Guide
4-50
Loop Current & Ground Ohms Test
In the Loop Current and Ground Ohms test, the tester measures and displays
the following parameters on a working POTS line:
•
Loop Current
(into 430
Ω
)
•
Ring-Ground Current
(into 430
Ω
)
•
Ground Ohms
(Cable sheath resistance from measurement point to C.O.)
Setting Up a Loop Current & Ground Ohms Test
1. From the POTS Toolbox, select
Loop Cur. & Gnd
Ω and press
D
(
Setups
).
The
Setups – Loop Current & Ground Ohms
screen is displayed.
2. Enter the desired setup values (see Table 4-12).
Table 4-12. Loop Current & Ground Ohms Setup Parameters
Setup Parameter Setting (default in Bold)
Loop Current Pass Threshold >20 mA (Range = 1 to 100 mA)
R-G Current Pass Threshold >33 mA (Range = 1 to 100 mA)
Ground Ohms Pass Threshold <25
Ω
(Range = 0 to 99
Ω
)