ADInstruments AD1000 User Manual page 74

5-point method to measure event loss:
Event loss is measured by 5-point method. When the [Loss] button in "Markers"
Label is not pressed, the marking points used by 5-point method will not display,
however, the system use 5-point method by default.
When apply 5-point method manually, the marker and its related 4 marking points
divide the trace around the event into 2 areas: the left to the active marker and the
right to the marker, the 2 marking points on the left and the 2 on the right both form a
straight line, move the two lines close to the event center and the power difference
between the two lines is the event insertion loss.
It also applies to the measurement of point A's or B's insertion loss.
When [Loss] button is pressed, AD1000 will show the marking points to measure
the event loss. When Marker A is selected, the screen will display the 4 marking
points related to Marker A. When Marker B is selected, the screen will display the 4
marking points related to Marker B. The Markers and marking points can move
separately.
The procedure to apply 5-point method:
1. In the main interface of AD1000 OTDR module, click "Markers" label;
2. Press [Loss] button, Marker A, Marker B and their related marking points
will be displayed on the trace;
Fig. 12.3 5-point method
AD1000 User's Manual
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