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7 Gently insert the fiber being tested into the fiber groove at the top of the OFI 400 head (refer
to Figure 2-3).
8 Pull down and hold the trigger to depress the fiber against the optical assembly.
9 Once the trigger is completely retracted, the OFI 400 will discriminate optical signals
transmitted through a single-mode fiber.
• If the fiber is carrying service, the LCD display will show the power readings and indicate
the signal direction by illuminating the corresponding [Traffic Direction] indicator.
• If the fiber is carrying a [TONE] signal, then LCD display will show the value of the detected
[TONE] frequency value and activate the beeper (continuous beep).
• When no signal is present, the OFI will illuminate the [NO SIGNAL] indicator and show the
[LO] label on the LCD display.
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