Tektronix TekRanger 2 TFS3031, Service Manual

Page: 173 / 272

Performance Check – TekRanger 2 (serial nos. B052000 and above)
4–12
TFS3031 TekRanger/TekRanger 2 Service Manual
Multimode Event-Detection and Dead-Zone Test Fixture
Construct the multimode event-detection and dead-zone test fixture as shown in
figure 4–6.
62.5/125
µ
m
multimode
FC connector
Secondary output
1 X 2 multimode
7/93%
splitter
Primary input
Primary
output
62.5/125
µ
m
multimode
ST connector
500 m x 2
62.5/125
µ
m
multimode fiber
Denotes cleaved end
Denotes splice
1
2
3
4
5
700 m 500 m
62.5/125
µ
m
multimode fiber
Figure 4–6: Multimode Event-Detection and Dead-Zone Test Fixture
1. To create non-reflective events, perform multiple arcs on the fusion splice
until the desired loss is obtained for non-reflective events. Measure the splice
loss of the event using an OTDR.
2. To create a repeatable reflective –40-dB event, cleave the 7% leg of the
splitter. Measure the event return loss using an OTDR. The desired event
return loss is –40 dB
2 dB.