Fluke OF-500 OptiFiber, Техническое справочное руководство

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Using the OTDR
Looking at OTDR Test Results
3
3-25
A
Wavelength for the trace and the End setting on the
Job tab in SETUP . If the test ran at two wavelengths,
press
A
to switch wavelengths. You can set the
wavelengths on the OTDR tab in Setup.
B
Magnification factors for the trace. See “Zooming the
Trace” on page 3-29.
C
The distance ( m or ft ) and the power loss ( dB ) between
the cursor and the measurement marker (
M
).
D
OTDR plot grid. You can enable or disable the grid on
the
OTDR tab in SETUP .
E
PASS/FAIL status appears if the cursor is on an event.
The status may refer to the event or the fiber segment
before the event. If the event looks ok, press
C
View
Details from the EVENT TABLE screen or the
SUMMARY screen to see results for the segment.
F
Press
E
to change the arrow keys’ function from
moving the cursor to zooming to moving the trace if
trace overlay is active (see page 3-29). The navigational
cue above the softkey labels describes the arrow keys’
current function.
G
Key for setting and clearing the measurement cursor.
See “Using the Measurement Cursor” on page 3-28.
H
Moves the cursor to the next event on the trace. If you
use
K
to move the cursor,
C
changes to Previous
Event and moves the cursor to the previous event.
I
Displays the event table.
J
For dual-wavelength tests, press
A
to switch
wavelengths.
K
Event information appears if the cursor is on an event.
Otherwise, the distance to the cursor is shown.
L
Scale for the distance along the cabling under test.
Tip: The distance scale represents the distance along the
fiber, which may be different from the distance along
the cable jacket. To adjust the length measurements
to represent cable jacket length, change the index of
refraction until the measured length matches the
jacket length.
M
Measurement marker and cursor. See “Using the
Measurement Cursor” on page 3-28.
N
Decibel scale for the OTDR backscatter.
Figure 3-13. OTDR Trace Screen (cont.)