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Chapter 2 CHANGING SYSTEM SETTINGS
2-12
Changing the Second Cursor Setting
Before explaining how to change the setting, an explanation is given below about the
second cursor.
The second cursor is used to check for the secondary reflection.
The secondary reflection makes an event look as if it were present in places where it is
actually not.
Assuming that excessive reflection occurs at point II
Mechanism of generation of secondary reflection
A pulsed ray that is output at point I advances toward point II.
↓
The ray (
1
) reflecting on the spliced surface at point II reflects again on the spliced
surface at point I and advances toward point II (
2
).
The instrument acquires
1
as data.
↓
Due to the ray
2
, a reflection ray (
3
) is generated again on the spliced surface at
point II.
The instrument acquires
3
as data.
Since all the reflection rays (
1
,
3
,
4
) are measured by the instrument,
3
is also acquired
as data in the same way as those that are actually generated, and is displayed. As a
result, the secondary reflection makes an event look as if it were present in places where it
is actually not.
Distance L
Distance 2L
1
2
3
I
II
III
4
1
3
4
Summary of Contents for AQ7260 OTDR
Page 1: ...User s Manual Y okogawa Electric Corporation AQ7260 OTDR IM 813920300 01E 2nd Edition ...
Page 27: ......
Page 70: ...Chapter 2 BEFORE STARTING MEASUREMENT 2 1 Changing System Settings 2 2 ...
Page 76: ...Chapter 2 CHANGING SYSTEM SETTINGS 2 7 When LINE is selected When DOT is selected TIP ...
Page 78: ...Chapter 2 CHANGING SYSTEM SETTINGS 2 9 When CROSS is selected When LINE is selected TIP ...
Page 89: ...Chapter 2 CHANGING SYSTEM SETTINGS 2 20 When LINE is selected When ARROW is selected TIP ...
Page 216: ...Chapter 4 ENTERING CHARACTERS 4 1 Entering Characters 4 2 4 2 Editing Characters 4 7 ...
Page 264: ...Chapter 6 FILE OPERATION 6 1 File Operation 6 2 6 2 Using the Utility Functions 6 22 ...
Page 295: ......
Page 351: ......
Page 413: ......
Page 422: ...Chapter 9 SPECIFICATIONS 9 9 AQ7260 OTDR ...
Page 423: ...Chapter 9 SPECIFICATIONS 9 10 AQ7261 SMF MODULE ...
Page 424: ...Chapter 9 SPECIFICATIONS 9 11 AQ7264 SMF MODULE ...
Page 425: ...Chapter 9 SPECIFICATIONS 9 12 AQ7265 SMF MODULE ...
Page 426: ...Chapter 9 SPECIFICATIONS 9 13 PRINTER FDD UNIT ...
Page 427: ...Chapter 9 SPECIFICATIONS 9 14 PRINTER UNIT ...
Page 428: ...Chapter 10 APPENDIX 10 1 Software Upgrade 10 2 10 2 Troubleshooting 10 5 10 3 Glossary 10 8 ...