VeEX FX150, User Manual

Page: 75 / 128

OTDR Series e-Manual, RevE00 Page 75 of 128
7.3.2 Span Settings
Tap the Span button to configure Span settings. After configuring the Span settings, click OK .
Use the
Span Settings
to offset the length of an external launch fiber or patchcord, which is
connected to the fiber under test; otherwise, it becomes part of the fiber span and analysis.
The launch fiber can be offset or compensated in any of the following ways:
• Entering the known distance manually.
• Entering the index # based on the event table.
• On the Event table, position the left marker at the event and tapping Span start in the
right side menu.
OTDR Setup: Span settings
•
Span Begin (Launch) : Enter Length or Index. Used to identify where a launch cable
ends and test fiber begins. Defines the start of the Fiber Under Test. This appears as a
green bracket with arrows pointing right on screen.
If
Event #1
is the end of the launch fiber, set the
Span Begin Index
to “1”.
•
Span End (Receive) : Enter Reverse Length or Reverse Index. Defines the end of the
Fiber Under Test. This will appear as a large green arrow pointing left on screen.
If a launch fiber is used at the far end of the test fiber, set the
Span End Index to the
Event #
associated to the location where the far end launch fiber starts.