Exfo FTB-700 for FTB-1 Manuel d'utilisateur Page 306
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Description of Event Types
298 FTB-700 Series
Reflective Event
Reflective Event
Reflective events appear as spikes in the fiber trace. They are caused by an
abrupt discontinuity in the index of refraction.
Reflective events cause a significant portion of the energy initially
launched into the fiber to be reflected back toward the source.
Reflective events may indicate the presence of connectors,
mechanical splices, or even poor-quality fusion splices or cracks.
Normally, loss and reflectance values are specified for reflective
events.
When the reflective spike reaches the maximum level, its top may be
clipped due to the saturation of the detector. As a result, the dead zone
(minimum distance for making a detection or attenuation
measurement between this event and a second nearby) may be
increased.
If you set thresholds, the application indicates a reflective fault in the
events table, whenever a value exceeds reflectance or connector loss
thresholds (see Setting Pass/Fail Thresholds on page 50).
Reflected
power (dB)
Distance
(km)
Reflective events
Clipped level
- FTB-700 Series 1
- Contents 3
- Certification Information 8
- Main Features 10
- Trace Acquisition Modes 10
- Optional Software Packages 11
- Data Post-Processing 11
- 4 FTB-700 Series 12
- OTDR Basic Principles 13
- 6 FTB-700 Series 14
- 2 Safety Information 17
- 10 FTB-700 Series 18
- Symbol Meaning 18
- Laser Safety Information 19
- 3 Getting Started with Your 21
- 14 FTB-700 Series 22
- Turn screws 23
- Back panel 23
- 16 FTB-700 Series 24
- Starting Module Applications 26
- 20 FTB-700 Series 28
- 24 FTB-700 Series 32
- 26 FTB-700 Series 34
- 28 FTB-700 Series 36
- Setting Macrobend Parameters 37
- 30 FTB-700 Series 38
- 5 Testing Fibers in Auto Mode 39
- 32 FTB-700 Series 40
- 6 Testing Fibers in Advanced 43
- 36 FTB-700 Series 44
- 38 FTB-700 Series 46
- 40 FTB-700 Series 48
- Acquisition Time 51
- Parameter-setting dials 53
- Selection 53
- Acquisition 56
- when you open a trace file 59
- 52 FTB-700 Series 60
- 56 FTB-700 Series 64
- 7Testing Fibers in Template 65
- Mode (optional) 65
- Restrictions of Template Mode 66
- Acquiring the Reference Trace 68
- 62 FTB-700 Series 70
- 66 FTB-700 Series 74
- 68 FTB-700 Series 76
- Selecting a Reference Trace 77
- 72 FTB-700 Series 80
- 74 FTB-700 Series 82
- Finder Traces 84
- Fault Finder File Name 86
- 80 FTB-700 Series 88
- Check for Fault Finder 89
- 82 FTB-700 Series 90
- 84 FTB-700 Series 92
- 9 Customizing Your OTDR 97
- 90 FTB-700 Series 98
- 92 FTB-700 Series 100
- Selecting the Distance Units 101
- 94 FTB-700 Series 102
- 96 FTB-700 Series 104
- 98 FTB-700 Series 106
- Keyboard 107
- 100 FTB-700 Series 108
- OTDR 101 109
- Graph View 110
- Linear View 112
- OTDR 105 113
- Summary Table 114
- OTDR 107 115
- Events Tab 116
- Analyzing Traces and Events 119
- Measure Tab 120
- Trace Info. Tab 120
- OTDR 113 121
- 114 FTB-700 Series 122
- Selecting the Default View 123
- Acquisitions 125
- 118 FTB-700 Series 126
- Using Zoom Controls 127
- Zoom window 130
- OTDR 123 131
- To d i sp l a y a b l a c k 131
- Customizing the Event Table 132
- Displaying or Hiding a Trace 134
- 128 FTB-700 Series 136
- OTDR 129 137
- OTDR 131 139
- 132 FTB-700 Series 140
- OTDR 133 141
- IMPORTANT 142
- Modifying Events 143
- 136 FTB-700 Series 144
- Inserting Events 147
- Deleting Events 149
- Managing Comments 150
- OTDR 145 153
- Loss and attenuation 153
- Threshold at 0.05 dB 155
- Threshold at 0.1 dB 155
- Threshold at 0.15 dB 155
- 148 FTB-700 Series 156
- OTDR 149 157
- 150 FTB-700 Series 158
- OTDR 151 159
- Reflective Ends of Fiber 160
- Swapping Traces 163
- Opening Trace Files 164
- File Type Zoom Marker 165
- 158 FTB-700 Series 166
- 11 Analyzing the Results 169
- Manually 169
- 162 FTB-700 Series 170
- Using Markers 171
- 164 FTB-700 Series 172
- Least-Square Approximation) 173
- 166 FTB-700 Series 174
- OTDR 167 175
- A-B LSA loss 175
- 168 FTB-700 Series 176
- Getting Reflectance 180
- OTDR 173 181
- OTDR Test Application 183
- OTDR Trace File Compatibility 184
- File generated with 185
- 178 FTB-700 Series 186
- 13 Creating and Generating 187
- 180 FTB-700 Series 188
- Generating a Report 189
- OTDR 183 191
- 14 Using the OTDR as a Light 195
- 188 FTB-700 Series 196
- 15 Analyzing Traces with the 199
- Bidirectional Analysis 199
- Application (Optional) 199
- 192 FTB-700 Series 200
- Application 201
- The main window is displayed 202
- OTDR 195 203
- OTDR 197 205
- 198 FTB-700 Series 206
- OTDR 199 207
- Measurement 208
- Viewing Results 210
- OTDR 205 213
- Bidirectional 215
- 208 FTB-700 Series 216
- Unidirectional 216
- OTDR 211 219
- Bidirectional Measurement 221
- 214 FTB-700 Series 222
- OTDR 215 223
- Span start 223
- Span end 223
- OTDR 217 225
- 220 FTB-700 Series 228
- 222 FTB-700 Series 230
- Using Markers to Edit Events 231
- 226 FTB-700 Series 234
- 228 FTB-700 Series 236
- 230 FTB-700 Series 238
- 232 FTB-700 Series 240
- 234 FTB-700 Series 242
- 236 FTB-700 Series 244
- OTDR 237 245
- Setting General Parameters 246
- OTDR 239 247
- Gridlines displayed 247
- 240 FTB-700 Series 248
- Customizing the Events Table 249
- 242 FTB-700 Series 250
- Information 252
- Setting Pass/Fail Thresholds 253
- 246 FTB-700 Series 254
- Test Default Minimum Maximum 254
- 248 FTB-700 Series 256
- 252 FTB-700 Series 260
- OTDR 253 261
- 254 FTB-700 Series 262
- Bidirectional Files 265
- OTDR 259 267
- 260 FTB-700 Series 268
- Creating Reports 269
- 16 Maintenance 273
- 266 FTB-700 Series 274
- Cleaning EUI Connectors 274
- Verifying Your OTDR 276
- Verif ying You r OTDR 277
- 270 FTB-700 Series 278
- Verif ying Your OTDR 278
- 2km or more 280
- Fiber end 280
- 1 to M reels of fiber 280
- (Add as needed) 280
- 274 FTB-700 Series 282
- Recalibrating the Unit 284
- Recycling and Disposal 285
- 17 Troubleshooting 287
- 280 FTB-700 Series 288
- Problem Cause Solution 288
- 282 FTB-700 Series 290
- Transportation 291
- 18 Warranty 293
- Service and Repairs 295
- 288 FTB-700 Series 296
- A Technical Specifications 297
- Technical Specifications 298
- OTDR 291 299
- B Description of Event Types 301
- Span Start 302
- Span End 302
- Short Fibers 302
- Continuous Fiber 303
- End of Analysis 304
- Non-Reflective Event 305
- Reflective Event 306
- Positive Event 307
- Launch Level 308
- Fiber Section 309
- Merged Event 310
- OTDR 303 311
- Pass/Fail Tests 312
- All Event Types Are Tested 313
- 306 FTB-700 Series 314
- OTDR 307 315
- OTDR 311 319
- OTDR 313 321
- OTDR 315 323
- OTDR 317 325
- ₼⦌␂ℝ☀⹂䓸德棟Ⓟ䤓屓⸩ 327
- MARKING REQUIREMENTS 328
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