Fluke OF-500-01 OptiFiber, Technical Reference Handbook, Page: 163 / 278

Using the Loss/Length Option
Using Mandrels for Testing Multimode Fiber
7-11
7
The tester requires you to set the reference at these times:
•
Anytime you change the loss/length module in the
main or remote tester.
•
Anytime you start using a different remote tester.
•
Thirty days after the reference was previously set.
The tester warns you if the reference value is outside of an
acceptable range.
See the sections "Testing in Smart Remote Mode", "Testing
in Loopback Mode", and "Testing in Far End Source Mode"
for details on setting the reference for each mode.
To see the reference information for the current remote
end setup, select Set Loss/Length Reference from the
Functions menu; then press
A
View Settings. Table 7-2
shows typical reference values.
Table 7-2. Typical Reference Values
Using Mandrels for Testing Multimode
Fiber
You should use mandrels when testing multimode fiber.
Mandrels can improve measurement repeatability and
consistency. They also allow the use of LED light sources to
certify 50 µm and 62.5 µm fiber links for current and
planned high bit-rate applications, such as Gigabit Ethernet
and 10 Gigabit Ethernet.
The gray mandrels included with some OptiFiber models
are compliant with TIA-568-C for 62.5 µm fiber with a 3 mm
jacket. Mandrels for 50 µm fiber are available from Fluke
Networks. Refer to the appropriate standard for mandrel
requirements if you follow other standards.
Smart Remote and Loopback Modes Far End Source Mode*
Module Minimum Nominal Maximum Minimum Maximum
OFTM-5612B Multimode
-27 dBm -20 dBm -17.5 dBm -28 dBm -5 dBm
OFTM-5732 Singlemode
-10 dBm -7 dBm -4.5 dBm -15 dBm -3 dBm
* For Far End Source mode with OFTM-5xx1 and 5xx2 modules, values are determined by the source and should not exceed the
maximum values. See the source's documentation for the source’s values.