Exfo FTB-7000 OTDR for FTB-200 v2 Manuel d'utilisateur Page 182
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Analyzing the Results Manually
168 FTB-7000 Series
Getting Event Loss (Four-Point and Least-Square Approximation)
³ Four-point event loss: the LSA method is used to fit a straight line to the
backscatter data within the two regions defined by markers a, A and
b, B, that is over the regions to the left and to the right of the event
bordered by markers A and B, respectively.
The two fitted lines are then extrapolated toward the center of the
event and the loss event is directly read from the drop in power
between the two lines.
Four-point
event loss
a
b
- FTB-7000 Series 1
- Contents 3
- DECLARATION OF CONFORMITY 10
- Domain Reflectometer 15
- 2 FTB-7000 Series 16
- Other models 16
- Main Features 17
- Trace Acquisition Modes 18
- Optional Software Packages 18
- Data Post-Processing 18
- Available OTDR Models 19
- OTDR Basic Principles 22
- 2 Safety Information 25
- Safety Information 26
- 3 Getting Started with Your 27
- Platform: 28
- 1. Turn off your unit 28
- 16 FTB-7000 Series 30
- Turn retaining screws 31
- Bottom panel 31
- 18 FTB-7000 Series 32
- Starting Module Applications 33
- 20 FTB-7000 Series 34
- 24 FTB-7000 Series 38
- 26 FTB-7000 Series 40
- 28 FTB-7000 Series 42
- Setting Macrobend Parameters 43
- 30 FTB-7000 Series 44
- Measurements 45
- 5 Testing Fibers in Auto Mode 47
- 34 FTB-7000 Series 48
- 6 Testing Fibers in Advanced 51
- 38 FTB-7000 Series 52
- 40 FTB-7000 Series 54
- 42 FTB-7000 Series 56
- Acquisition Time 59
- Parameters setting dials 61
- Selection 61
- 48 FTB-7000 Series 62
- 50 FTB-7000 Series 64
- Acquisition 65
- 52 FTB-7000 Series 66
- 54 FTB-7000 Series 68
- ³ when you open a trace file 68
- 56 FTB-7000 Series 70
- 58 FTB-7000 Series 72
- 7Testing Fibers in Template 75
- Restrictions of Template Mode 76
- Acquiring the Reference Trace 78
- 66 FTB-7000 Series 80
- 70 FTB-7000 Series 84
- 72 FTB-7000 Series 86
- Selecting a Reference Trace 88
- 76 FTB-7000 Series 90
- 78 FTB-7000 Series 92
- Finder Traces 94
- Fault Finder File Name 96
- 84 FTB-7000 Series 98
- Check for Fault Finder 99
- 86 FTB-7000 Series 100
- Keyboard 101
- 88 FTB-7000 Series 102
- Selecting the Distance Units 104
- 9 Customizing Your OTDR 107
- 94 FTB-7000 Series 108
- 98 FTB-7000 Series 112
- 100 FTB-7000 Series 114
- OTDR 101 115
- OTDR 103 117
- OTDR 105 119
- Graph View 120
- Linear View 122
- OTDR 109 123
- Summary Table 124
- OTDR 111 125
- Events Tab 126
- OTDR 113 127
- Tooltip identifying the 127
- 114 FTB-7000 Series 128
- Analyzing Traces and Events 129
- Measure Tab 130
- Trace Info. Tab 130
- OTDR 117 131
- 118 FTB-7000 Series 132
- Selecting the Default View 133
- Acquisitions 135
- 122 FTB-7000 Series 136
- Using Zoom Controls 137
- Zoom window 140
- OTDR 127 141
- To di s pl a y a b lac k 141
- Customizing the Event Table 142
- Displaying or Hiding a Trace 144
- 132 FTB-7000 Series 146
- OTDR 133 147
- OTDR 135 149
- 136 FTB-7000 Series 150
- OTDR 137 151
- IMPORTANT 152
- Modifying Events 153
- 140 FTB-7000 Series 154
- Inserting Events 157
- Deleting Events 159
- OTDR 147 161
- Loss and attenuation 161
- ³ Threshold at 0.05 dB 163
- ³ Threshold at 0.1 dB 163
- ³ Threshold at 0.15 dB 163
- 150 FTB-7000 Series 164
- OTDR 151 165
- 152 FTB-7000 Series 166
- OTDR 153 167
- Reflective Ends of Fiber 168
- OTDR 157 171
- Swapping Traces 172
- Opening Trace Files 173
- 160 FTB-7000 Series 174
- Type of file Zoom Marker 174
- 162 FTB-7000 Series 176
- 11 Analyzing the Results 177
- Manually 177
- 164 FTB-7000 Series 178
- Using Markers 179
- 166 FTB-7000 Series 180
- Least-Square Approximation) 181
- 168 FTB-7000 Series 182
- OTDR 169 183
- A-B LSA loss 183
- 170 FTB-7000 Series 184
- Getting Reflectance 188
- OTDR 175 189
- OTDR Test Application 191
- OTDR Trace File Compatibility 192
- File generated with 193
- 180 FTB-7000 Series 194
- 13 Creating Reports 195
- 182 FTB-7000 Series 196
- Generating a Report 197
- OTDR 185 199
- 14 Using the OTDR as a Light 203
- Source or VFL 203
- 190 FTB-7000 Series 204
- 15 Analyzing Traces with the 207
- Bidirectional Analysis 207
- Application 207
- 194 FTB-7000 Series 208
- The main window is displayed 210
- OTDR 197 211
- OTDR 199 213
- 200 FTB-7000 Series 214
- OTDR 201 215
- Measurement 216
- Viewing Results 218
- OTDR 207 221
- Bidirectional 223
- 210 FTB-7000 Series 224
- Unidirectional 224
- OTDR 213 227
- Bidirectional Measurement 229
- 216 FTB-7000 Series 230
- OTDR 217 231
- Span start 231
- Span end 231
- OTDR 219 233
- 222 FTB-7000 Series 236
- 224 FTB-7000 Series 238
- Using Markers to Edit Events 239
- 228 FTB-7000 Series 242
- 230 FTB-7000 Series 244
- 232 FTB-7000 Series 246
- 234 FTB-7000 Series 248
- 236 FTB-7000 Series 250
- 238 FTB-7000 Series 252
- OTDR 239 253
- Setting General Parameters 254
- OTDR 241 255
- Gridlines displayed 255
- 242 FTB-7000 Series 256
- Customizing the Events Table 257
- 244 FTB-7000 Series 258
- Information 260
- Setting Pass/Fail Thresholds 261
- 248 FTB-7000 Series 262
- Test Default Minimum Maximum 262
- 250 FTB-7000 Series 264
- 254 FTB-7000 Series 268
- OTDR 255 269
- 256 FTB-7000 Series 270
- Bidirectional Files 273
- OTDR 261 275
- 262 FTB-7000 Series 276
- Creating Reports 277
- 16 Maintenance 281
- Verifying Your OTDR 284
- Verif ying Your OTDR 285
- 272 FTB-7000 Series 286
- 274 FTB-7000 Series 288
- 276 FTB-7000 Series 290
- Recalibrating the Unit 292
- Recycling and Disposal 293
- 17 Troubleshooting 295
- 282 FTB-7000 Series 296
- Problem Cause Solution 296
- FTB-7X00D-XX-XX-XX 298
- FTB-7200D-XX-XX-XX 298
- FTB-7X00E-XXB-XX-XX 298
- Transportation 299
- 18 Warranty 301
- Service and Repairs 303
- 290 FTB-7000 Series 304
- A Technical Specifications 305
- Technical Specifications 306
- B Description of Event Types 311
- Span Start 312
- Span End 312
- Short Fibers 312
- Continuous Fiber 313
- End of Analysis 314
- Non-Reflective Event 315
- Reflective Event 316
- Positive Event 317
- Launch Level 318
- Fiber Section 319
- Merged Event 320
- OTDR 307 321
- Pass/Fail Tests 322
- All Event Types Are Tested 323
- 310 FTB-7000 Series 324
- OTDR 311 325
- OTDR 315 329
- OTDR 317 331
- OTDR 319 333
- OTDR 321 335
- ₼⦌␂ℝ☀⹂䓸德棟Ⓟ䤓屓⸩ 337
- MARKING REQUIREMENTS 338
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