Tektronix TekRanger 2 TFS3031, Service Manual

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Performance Check – TekRanger 2 (serial nos. B052000 and above)
4–10
TFS3031 TekRanger/TekRanger 2 Service Manual
Singlemode Loss and Distance Accuracy Test Fixture
This test fixture is used to verify the loss and distance accuracy of the TFS3031.
It consists of two 4.4-km spools and one 8.8-km spool of Corning SMF28
singlemode fiber.
FC/PC Connector FC/APC Connector
4.4 km SM Fiber
4.4 km SM Fiber
8.8 km SM fiber with an event with
known loss at a known distance
Event with known
loss and distance
Figure 4–4: TFS3031 Singlemode Loss and Distance Accuracy Test Fixture
Assemble this fixture as follows:
1. Fusion splice the FC/PC connector to one end of the 4.4-km spool of
Corning SMF28 singlemode fiber.
2. Fusion splice an FC/APC connector to the opposite end of this spool.
3. Fusion splice an FC/APC connector to both ends of the second 4.4-km spool
of Corning SMF28 fiber.
4. Fusion splice an FC/PC connector to one end of the 8.8-km spool of Corning
SMF28 fiber.
5. Fusion splice an FC/APC connector to the opposite end of the 8.8-km spool.
6. At approximately the midpoint (4.4 km) of the 8.8-km spool, fabricate a
nonreflective event of 0.5 dB (
±
0.1 dB). Absolute location and loss values
are not critical, however actual values must be known to within
±
0.01 dB
and
±
0.5 m.
7. Measure the actual location and loss of the event and record for use when
verifying the TFS3031.