Fluke Networks CertiFiber Pro Users Manual - Manual (Page 314)

Versiv Cabling Certification Product Family
Technical Reference Handbook
292
Causes of Loss/Length Test Failures
Table 14. Causes of Loss/Length Test Failures
Loss measurement gives a FAIL result
 One or more connectors is dirty, damaged, misaligned, or loose. The VFL
can help you see some types of damage in connectors (Chapter 11). An
OTDR, such as the Fluke Networks OptiFiber
® Pro OTDR, can help you
locate other types of faults (Chapter 9).
 There is a kink, sharp bend, or crack in a test reference cord or the fiber
under test. Use the VFL to see these faults.
 The fiber has a bad splice. Use the VFL to see this fault.
 For limits that give a calculated loss value, the number of connectors or
splices on the TEST SETUP screen is too low
 The wrong fiber type is selected on the TEST SETUP screen.
 The reference is incorrect. Set the reference again.
 For multimode test reference cords wound around mandrels, the
mandrels are the wrong size.
 For multimode test reference cords wound around mandrels, the cords
are made from bend-insensitive fiber.
 A test reference cord or fiber segment has the wrong core size. An OTDR
can show you where the core size is wrong.
 The test reference cords have PC or UPC connectors, but the fiber under
test has APC connectors.
Loss is negative
 The fiber ends were dirty when you set the reference.
 You disconnected the test reference cord from a tester’s OUTPUT port
after you set the reference.
 There was a kink in a test reference cord when you set the reference.
 The connectors were loose when you set the reference.
 The testers were much colder when you set the reference than during
testing.
 Some other problem caused a bad reference value.
 If loss is negative, set the reference again and do the test again.