TB 9-6625-2309-35
(7) Press ACCEPT CHANGES softkey.
(8) Press Return to OTDR Mode softkey.
c. To establish reference cursor position value perform steps (1) through (9) below:
(1) Press PULSE WIDTH pushbutton as required to select SHORT.
(2) Ensure INDEX is set to 1.4990.
NOTE
To change index value, press and hold N/LASER pushbutton
and adjust CURSOR A control to set INDEX to new value.
(3) Press DISPLAY FROM pushbutton as required to select ORIGIN.
(4) Press FAST SCAN pushbutton and wait for LASER ON/AVG to indication on
TI display to go off.
NOTE
It may be necessary to press HOR CONT or HOR EXP
pushbuttons in order to view REFLECTIVE EVENT (fig. 19).
(5) Adjust CURSOR A control to place cursor A at leading edge of REFLECTIVE
0 km
4 km
8 km
A
B
R E F LE C T IVE
EVENT
0. 0
4, 095. 9
8, 191. 8
↑
1, 024. 0 km / div →
8. 0 dB / div
A=
1,008. 0 m
INDEX: 1. 4990
B = 4, 927. 9 m
λ: 850 MM
PW:
40 ns
A→B = 3, 019. 9 m
# AVG = 4, 096. 0
2-POINT LOSS: 29. 68 dB
Figure 19. Course placement of
cursor A
after completing fast scan (TD-260C).
37