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KFI-40 Fiber Identifier User Manual

Structure 

1

Fiber signal recognition 

3

VFL red light test 

4

LED lighting 

5

Panel features open

2

Turn on the power, open the dust cover, and insert the fiber 
interface under test into the laser connector.Press the VFL 
button, the laser will output continuous wave, press the VFL 
button again, the laser pulse. Rush output, short press again 
to turn off the VFL function. 

1

2

3

4

5

1

6

7

5

8

6

9

4

dB

Hz

5.9

270

1  Fixture cover 

2mm/3mm

 1、LCD display-display power value, frequency. 
 2、Direction indicator-indicating the direction 

       of the optical fiber light source under test. 

 3、Power-power on/off. 
 4、Backlight-Switch the backlight function [On] or [Off]. 
 5、VFL key-- turn on/off the VFL function.

 

2  Plunger detachable, use on the 

front and back, choose the cor-

responding surface according to 

the thickness of the fiber

Optical components

4  Fiber groove 

battery cover 

6  Fixing screws 

2*1.5V alkaline battery 

Dust cover: built-in VFL interface 

(2.5mm universal interface) and 

LED lighting 

Lock button

2

3

5

2

4

dB

Hz

5.9

270

dB

Hz

5.9

270

Turn on the power, open the dust cover, click the "     " 

button to turn on the flashlight, which is convenient to 

use in a dark environment and realize the lighting function; 
short press the "    " button to turn off the flashlight. 

Note: This product does not specify power accuracy 

and should not be used to determine the actual signal 

strength in the fiber. 

250/900μm

front 

back 

2.If there is a signal in the optical fiber, the left and 
right direction lights show the signal direction. 

3.

If there is no signal in the optical fiber, the LCD 

display shows LO, and the direction indicator light 
may flicker left and right. When the fiber is not 
clamped, the direction light may also flicker left 

and right 

4.When the signal frequency is 2KHz, 1KHz, 
270Hz, the corresponding indicator light is on, 
accompanied by a buzzing sound (when the signal 
is too weak, it will not be correctly identified). 

1.Put the fiber to be tested into the groove of the 

fixture, push the button to lock the fixture, and 

install the fixture cover . 

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