Setting The Number Of Adapters And Splices; Setting A Reference - Fluke DSP-FTA420 User Manual

Setting the Number of Adapters and Splices

Some test standards use a calculated limit for the loss test. This limit includes
the number of adapters and splices in the link. In the test tool's SETUP mode,
enter the number of adapters and number of splices added in each direction of
the fiber path since the reference was set. For example, the reference
connections in Figure 5 show one adapter in each path. When power loss is
measured as shown in Figure 8, there are three adapters in each path. You have
added two adapters in each path, so you would enter "2" for the "Number of
Adapters" count in SETUP.
The test tool uses the number of adapters and splices you enter and the
measured length of the fiber to calculate the loss limit for the link. If the
measured loss is greater than the calculated limit allows, the link fails.
The insertion loss allowed for each adapter or splice depends on the selected
test standard. If necessary, you can change the insertion loss used for adapters
or splices by creating a custom test as described on page 38.

Setting a Reference

The reference is used for power loss and delay measurements. Setting a
reference lets your DSP-4000 test tool automatically subtract out the losses or
delays due to patch cords or the DSP-FTA4XX units. The loss and delay for a
fiber under test is automatically calculated as the difference between the
reference loss and delay and those values measured with the fiber inserted.
For the most accurate test results, you should set the reference at these times:
•
Anytime you start using a different DSP-FTA4XX unit or other optical
source.
•
Anytime you reconnect a or change the patch cord used on the DSP-
FTA4XX OUTPUT port or other source.
For the most accurate test results, set the reference at the beginning
of each day using the test configuration (Figure 5, 6, or 7) you will be
using that day.
The test tool stores separate reference values for each remote end
configuration.
Setting Up for Fiber Tests
Note
Fiber Test Adapter
11