EXFO TG-300B Tone Generator - Manual (Page 14)

Operating the TG-300B/LFD-300B FiberFinder 9
Determining if a Fiber Is Live or Dark
The LFD­300B can help you quickly determine if a specific fiber is live or dark.
To determine if a fiber is live or dark:
1. Install the fiber in the alignment groove of the unit as described in Installing the
Fiber in the Alignment Groove on page 6.
2. Put the protective cap on the head of the unit.
3. Slide the switch downward.
During the LFD­300B startup procedure, the unit vibrates and emits a sound, the
Positioning LED blinks, and LOAd appears on the display. This startup procedure
takes about 20 seconds to complete.
³
If the unit detects a signal in the fiber, the measured power (dBm) appears
on the display.
³
If no signal is detected, the unit does not emit a beep, no LED is lit, and
- LO - appears on the display.
4. Slide the switch upward when the test is finished.
I
MPORTANT
EXFO recommends that you use the protective cap when performing
your tests to minimize the possible influence of ambient light.