Exfo FTB-5600 Distributed PMD Analyzer Manuel d'utilisateur Page 134
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Optimizing Measurements
128 FTB-5600
Use an Appropriate OTDR Pulse Length
Use an Appropriate OTDR Pulse Length
A recommended pulse length of 100 ns should be used for most
acquisitions. However, when a depolarization effect for this pulse may be
too big because of short beating lengths from FUTs (that are often observed
in the field fibers), a short pulse length, for example, 50 ns, may be used to
reduce the depolarization effect and improve SNR so as to ensure an
acquired signal level that is larger than a coherent noise level, but it will
result in a reduced measurable range.
On the other hand, if the FUT has a small depolarization, use a long pulse
length, for example, 275 ns, for the acquisition may be helpful to increase
the measurable range or reduce the acquisition time.
Below you can see an example of a depolarization on a fiber:
- FTB-5600 1
- Contents 3
- Certification Information 5
- DECLARATION OF CONFORMITY 6
- 1 Introducing the FTB-5600 7
- Distributed PMD Analyzer 7
- 4 FTB-5600 10
- Frequently Used Terms 10
- Term Definition 10
- 2 Safety Information 13
- 3 Getting Started with your 15
- 10 FTB-5600 16
- Distributed PMD Analyzer 11 17
- Turn retaining screw knob 17
- FTB-500 left panel 17
- 12 FTB-5600 18
- Distributed PMD Analyzer 13 19
- Application 20
- Exiting the Application 22
- Distributed PMD Analyzer 19 25
- 20 FTB-5600 26
- Distributed PMD Analyzer 21 27
- 2. Select the General tab 28
- Setting up the Graph Display 29
- 2. Select the Display tab 30
- Setting up Storage Options 33
- ³ Cumulative PMD 35
- ³ PMD coefficient 35
- 30 FTB-5600 36
- Setting up Cable Information 37
- 32 FTB-5600 38
- Distributed PMD Analyzer 35 41
- 36 FTB-5600 42
- Performing an Acquisition 42
- Difference between 44
- 40 FTB-5600 46
- Distributed PMD Analyzer 41 47
- 42 FTB-5600 48
- 44 FTB-5600 50
- 46 FTB-5600 52
- Distributed PMD Analyzer 47 53
- 48 FTB-5600 54
- Distributed PMD Analyzer 49 55
- 50 FTB-5600 56
- Distributed PMD Analyzer 51 57
- 52 FTB-5600 58
- Distributed PMD Analyzer 53 59
- 54 FTB-5600 60
- 5 Managing Results 61
- 56 FTB-5600 62
- Opening an Existing File 63
- Managing Results 64
- 3. Press Open 64
- Using Zoom Controls 68
- Section Event Table 69
- 64 FTB-5600 70
- CumulPMDSectionFirstValue 70
- Section Status 71
- 66 FTB-5600 72
- 68 FTB-5600 74
- Distributed PMD Analyzer 69 75
- Marker A 75
- Marker B 75
- Editing Sections 76
- 3. Press Split 79
- 74 FTB-5600 80
- 76 FTB-5600 82
- 78 FTB-5600 84
- Adding Comments to Segments 85
- 3. Press Edit Comments 86
- (Delta PMD Tab) 87
- 82 FTB-5600 88
- Estimating Results 89
- 84 FTB-5600 90
- Distributed PMD Analyzer 87 93
- 2. Press Settings 94
- Viewing Trace Information 95
- 3. Select the Analysis tab 96
- 4. Press Reanalyze 96
- 94 FTB-5600 100
- Generating Reports 100
- 6 Maintenance 101
- MPORTANT 102
- Recalibrating the Unit 104
- Recycling and Disposal 105
- 7 Troubleshooting 107
- FTB-5600-XX 108
- Transportation 109
- Liability 112
- Service and Repairs 114
- Distributed PMD Analyzer 109 115
- A Technical Specifications 117
- B Distributed Cumulative PMD 119
- Measurement Theory 119
- CAcquisition Data 123
- 118 FTB-5600 124
- Distributed PMD Analyzer 119 125
- 120 FTB-5600 126
- D Optimizing Measurements 127
- 122 FTB-5600 128
- Perform Multiple Measurements 129
- Acquisition 130
- Optimizing Measurements 132
- Distributed PMD Analyzer 127 133
- 128 FTB-5600 134
- Distributed PMD Analyzer 129 135
- 130 FTB-5600 136
- Use a Receive Fiber 140
- Distributed PMD Analyzer 135 141
- Distributed PMD Analyzer 137 143
- ₼⦌␂ℝ☀⹂䓸德棟Ⓟ䤓屓⸩ 144
- MARKING REQUIREMENTS 145
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