Fluke 990DSL, Руководство пользователя

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POTS Testing and Fault Location
Dial-Up Test Group
4
4-55
Running a Milliwatt VF Loss Test
1. Select the Milliwatt function and either automatically or manually dial a
C.O. Milliwatt phone number as described earlier.
The tester waits for a fixed post-dialing interval, then automatically
measures the Milliwatt frequency and VF line loss of the applied signal.
After the test is completed, the tester displays a VF Loss Results screen
similar to that shown in Figure 4-27.
2. Press
A
(
Contin. VF Loss
) to monitor signal loss in real-time.
3. To drop the switch connection and hang up, press
M
from the VF Loss
results screen.
The
Select Dialing Mode
screen is re-displayed.
Running a Quiet Term. VF Noise Test
After you select the QT VF Noise function and dial (either automatically or
manually) a C.O. Quiet Termination phone number as described earlier, the
tester waits for a fixed post-dialing interval, then automatically measures the
Metallic Noise (Nm) and Power Influence (PI) on the line.
After the test is completed, the tester displays a VF Noise Results screen
similar to that shown in Figure 4-24.
You can now do the following:
•
Press
A
(
Contin. Nm
) to monitor metallic noise in real-time.
•
Press
B
(
Contin. P.I.)
to monitor Power Influence in real-time.
•
Press
C
(
Power Harmonics
) to display a Power Harmonics graph.
To drop the switch connection and hang up, press
M
from the VF Noise
results screen, and the
Select Dialing Mode
screen is again displayed.