Ideal Networks Serie 33-960 Cable tester, cable tester 33-960-3 User Manual

Description of Event Types

102

IDEAL

Launch Level

This event indicates the level of the signal launched into the fiber.

³

The figure above shows how the launch level is measured.

A straight line is plotted using least-square approximation to fit all trace 
points in the linear area between the first and second detected events.

The straight line is projected toward the Y-axis (dB) until it crosses the 
axis.

The crossing point indicates the launch level.

³

<<<< in the events table indicates that the launch level is too low.

Reflected power 
(dB)

Distance
(km)

Launch level 
event position

Second event

Launch

level

Linear area