Measuring Optical Power Loss - Fluke FTK200 User Manual

FTK200
Users Guide

Measuring Optical Power Loss

Optical power loss is the light energy lost through the fiber,
adapters, splices, and other components in a fiber link.
The loss for a fiber under test is automatically calculated
as the difference between the loss with the fiber inserted
and the reference loss. (See Figures 6 and 7.)
To measure loss, proceed as follows:
1. Verify that the meter and source are set to the proper
wavelength. Let the source warm up for two minutes,
if necessary.
The patch cords used for loss measurements
should be the same patch cords used to set the
reference at the wavelength you are testing. If the
patch cords have been disconnected from the
meter or source since the reference was set, set
the reference again before measuring loss.
12
Note
2. Clean all fiber ends.
3. Set a reference, if necessary. (See the previous
section "Setting a Reference for Loss Measurements"
for details.)
4. Make the connections shown in Figure 7.
The additional test jumper used during loss
measurement ensures that the loss you measure
includes the fiber to be tested and the
connections at both ends of the fiber.
5. Verify that the meter is in the loss measurement
mode. If so, the unit of measurement will be
D
not, press .
6. Read the loss measurement.
Note
. If it is
dB