Checking The Battery - Fluke FOM Instruction Sheet

9. Connect the launch and receive cables to cable under test;
record the measurement. (Cables must be the same fiber
type as the cable under test.)
10. Subtract the optical loss measurement from the dBm
reference measurement to get the actual dB loss. (If the
DMM has an activated reference function, the reading is dB
loss.)

Checking the Battery

If the LED is on continuously, the battery is good.
If the LED blinks or is not on, replace the battery.
Patch
Panel
mV
Receive
FOM
Cable
Under
Test
Launch
Cable
Figure 4. Measuring Optical Loss
Cable
FOS
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