Fluke Networks CertiFiber Pro Users Manual - Manual (Page 188)

Versiv Cabling Certification Product Family
Technical Reference Handbook
166
 When you connect a test reference cord to the module’s
output port or to another source, even if you connect the
same test reference cord you connected before.
 When the tester tells you that the reference is out of date.
 When a loss measurement is negative. This occurs when there
was a problem when you set the reference. For example, an
endface was dirty or the testers were cold.

Caution
Do not disconnect the test reference cords from the
modules’ output ports after you set the reference. If
you do, you will change the amount of optical
power that enters the fiber and the reference will
not be correct.
Good Reference Values
Reference values must be in these ranges:
 Multimode 50/125 µm fiber: -19.4 dBm to -26.5 dBm
 Multimode 62.5/125 µm fiber: -17.5 dBm to -23.0 dBm
 Singlemode fiber: -1.0 dBm to -6.0 dBm
If your reference value is outside of the applicable range given
above, clean and inspect all connectors then set the reference
again. Do this even if the tester lets you use the value.
If your test reference cords and connectors are in good condition,
and you use the correct procedure to set the reference, the
reference value will not change by more than approximately
0.4 dBm.
How to See the Reference Values
 After you set the reference, tap View Reference on the SET
REFERENCE screen.
 After you do an Autotest, tap the result window for a fiber,
then tap VIEW REFERENCE.