Test III. Attenuation Deadzone D Single-Mode/Multimode Module Performance Tests
E6000C Mini-OTDR User’s Guide, E0302
235
Test III. Attenuation Deadzone
NOTE The setup simulates a return loss of 35 dB. To care for the
fact that – due to the coupler – the light pulse travels
through the attenuator twice to sum up, the attenuator
needs to be set to a value 3 dB larger than the simulated
return loss, that is. 35 dB + 3 dB = 38 dB.
As this value includes the Insertion Loss of the
attenuator, you may need to determine the Insertion Loss
first.
Connect equipment 1 Connect the equipment as for the event deadzone test
(see Figure 78).
Settings 2 Turn on the OTDR, and after the self-test has passed,
recall the default settings and the resolution mode.
[S
ETTINGS]<RECALL..><DEFAULT SETTING>
[Settings]<Optimize Mode><Resolution>
3 Set linestyle to SOLID.
[V
IEW]<PREFERENCES><DOTTED LINE>: OFF
4 Set 2 pt. loss
[A
NALYSIS]<2 PT.LOSS>
5 Make sure that the length unit is set to meters.
[C
ONFIG]<LENGTH UNIT><METER [M]>
6 Set the Start and Span to 0.00–10.00 km.
[S
ETTINGS]<RANGE><0-10 KM>
7 Either (Single-mode module)
Set the pulsewidth to 30 ns.
[S
ETTINGS]<PULSEWIDTH><30 NS>. Close by OK.
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