Tektronix TFP2A Service Manual

Service Manual

TFP2A FiberMaster Optical Time-Domain Reflectometer

070–9188–03

Warning

The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to the Safety Summary prior to performing service.

First Printing: April 1997

Products of T ektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/ or pending patents.

TEKTRONIX, TEK, and FiberMaster are registered trademarks of Tektronix, Inc. Printed in U.S.A. Specification and price change privileges are reserved.

WARNING

This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used in accordance with the instructions manual, may cause interference to radio communications. It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designated to provide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case, the user, at his or her own expense, will be required to take whatever measures may be required to correct the interference.

EC Declaration of Conformity

Tektronix Holland N.V. Marktweg 73A 8444 AB Heerenveen The Netherlands

declare under sole responsibility that the

TFP2A FiberMaster

meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was demonstrated to the following specifications as listed in the official Journal of the European Communities:

EN 50081-1 Emissions

EN 55022 Radiated, Class B IEC 1000-3-2 Mains Current Harmonics

EN 50082-1 Immunity:

IEC 1000-4-2 Electrostatic Discharge IEC 1000-4-3 RF Radiated IEC 1000-4-4 Fast Transients IEC 1000-4-5 Surge IEC 1000-4-11 Dropout

Contacting Tektronix

Introduction

Phone 1-800-833-9200*

Address Tektronix, Inc.

Department or name (if known) 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA

Web site www .tektronix.com

Sales support 1-800-833-9200, select option 1*

Service support 1-800-833-9200, select option 2*

Technical support Email: techsupport@tektronix.com

1-800-833-9200, select option 3* 1-503-627-2400

6:00 a.m. – 5:00 p.m. Pacific time

* This phone number is toll free in North America. After office hours, please leave a

voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices.

TFP2A FiberMaster Module-Level Service Manual

Safety Information ............................................................................. xi

1 Introduction: the FiberMaster OTDR...................................... 1-1

Product Description......................................................................................1-1

Using this Manual..........................................................................................1-4

Strategy for Servicing................................................................................1-4

Manual Structure.......................................................................................1-5

Manual Conventions.................................................................................1-5

Warranty Information....................................................................................1-6

Tektronix Service...........................................................................................1-7

Specifications................................................................................................1-8

Electrical Characteristics...........................................................................1-8

Operational Characteristics.....................................................................1-11

Physical Characteristics..........................................................................1-11

Environmental Characteristics ................................................................1-12

FS1300 Singlemode Optical Module ......................................................1-14

FS1500 Singlemode Optical Module ......................................................1-15

FS1315 Singlemode Optical Module ......................................................1-16

FG1300 Singlemode Optical Module......................................................1-17

FG1315 Singlemode Optical Module......................................................1-18

FL1300 Singlemode Optical Module.......................................................1-19

FL1500 Singlemode Optical Module.......................................................1-20

FL1315 Singlemode Optical Module.......................................................1-21

FM8500 Multimode Optical Module ........................................................1-22

FM1300 Multimode Optical Module ........................................................1-23

FM8513 Multimode Optical Module ........................................................1-24

Accessories and Options ...........................................................................1-25

Mainframes.............................................................................................1-25

Accessories.............................................................................................1-25

Options....................................................................................................1-26

Unpacking and Preparation for Use ..........................................................1-29

Preparation for Use.................................................................................1-29

Storage ...................................................................................................1-35

Repacking for Shipment..........................................................................1-35

Recalibration................................................................................................1-36

2 General Operating Instructions.............................................. 2-1

Overview of FiberMaster Operation.............................................................2-2

The Acquisition Screen.............................................................................2-4

Basic Operating Procedures........................................................................2-8

TFP2A FiberMaster Module-Level Service Manual v

Table of Contents

3 Theory of Operation ................................................................ 3-1

A1 - Control....................................................................................................3-1

Host Processor .........................................................................................3-1

Display Processor.....................................................................................3-1

Timebase..................................................................................................3-2

Signal Averager ........................................................................................3-2

A2 - Front Panel.............................................................................................3-3

Front Panel ...............................................................................................3-3

A3 - Power Supply.........................................................................................3-3

A4 - Interconnect...........................................................................................3-3

Interconnect..............................................................................................3-3

A5 - Module Support .....................................................................................3-4

Digital Interface and Cooler Power Supplies ............................................3-4

Mask Generator........................................................................................3-4

Strobe Continuation..................................................................................3-4

A6 - Printer Assembly...................................................................................3-5

Printer-Power Distribution.........................................................................3-5

A7 - Display Assembly..................................................................................3-5

Display......................................................................................................3-5

A20/A30 - Optical Plug-in..............................................................................3-5

4 Maintenance.............................................................................4-1

Product Service.........................................................................................4-1

Static-Sensitive Components....................................................................4-2

Inspection and Cleaning Procedures..........................................................4-3

Exterior Inspection....................................................................................4-3

Exterior Cleaning ......................................................................................4-4

Optical-Fiber Cleaning..............................................................................4-4

Interior Inspection .....................................................................................4-6

Interior Cleaning........................................................................................4-7

Lubrication ................................................................................................4-7

Terminal Interface..........................................................................................4-8

Functional Tests..........................................................................................4-10

Mainframe Checks..................................................................................4-10

Performance Verification............................................................................4-16

Equipment Required...............................................................................4-16

Clock Frequency.....................................................................................4-16

Verify Clock Phase..................................................................................4-17

Front-Panel Loss.....................................................................................4-18

Dynamic Range ......................................................................................4-20

Dead Zone (Attenuation).........................................................................4-32

Dead Zone (Event)..................................................................................4-34

Displayed Noise <0.030 dB (FS/FG series only) ....................................4-36

Zero Distance Accuracy..........................................................................4-38

Vertical System Linearity ........................................................................4-40

Optical Output Amplitude........................................................................4-56

vi TFP2A FiberMaster Module-Level Service Manual

Table of Contents

Adjustments.................................................................................................4-60

Control Board Adjustments.....................................................................4-60

Printer Board Adjustment........................................................................4-62

Display Adjustments ...............................................................................4-64

Troubleshooting and Diagnostics .............................................................4-70

Using the Diagnostics Menus .................................................................4-70

Troubleshooting Flowchart......................................................................4-71

Removal and Replacement Procedures....................................................4-75

Covers and Front Panel..........................................................................4-77

Back-Panel Assembly and Plug-In Optical Modules...............................4-79

Control Board..........................................................................................4-80

Printer Tray and Printer...........................................................................4-82

CRT, Color Shutter/Monochrome Filter, and Display Board...................4-83

PSI Power Supply (AC only)...................................................................4-87

IPD Power Supply and DC Power Option...............................................4-89

MDI Power Supply and DC Power Option ..............................................4-95

Disk Drive................................................................................................4-98

Module Support Board............................................................................4-99

Interconnect Board................................................................................4-100

Fan........................................................................................................4-101

Power Switch, Wire Set, and Line Filter................................................4-103

5 Replaceable Parts List ............................................................ 5-1

Parts Ordering Information...........................................................................5-1

Module Replacement................................................................................5-1

Using the Replaceable Parts List.................................................................5-2

Tektronix Part Number..............................................................................5-2

Serial/Model No. .......................................................................................5-2

Name and Description ..............................................................................5-2

Mfr. Code and Part Number......................................................................5-2

A Performance Verification Data Sheets...................................A-1

Optical Test Summary Data Sheet—FS1315 Singlemode ...................... A-2

Optical Test Summary Data Sheet—FG1315 Singlemode...................... A-3

Optical Test Summary Data Sheet—FL1315 Singlemode....................... A-4

Optical Test Summary Data Sheet—FM8513 Multimode........................A-5

B GPIB and RS-232 Connections...............................................B-1

C Firmware Features...................................................................C-1

D Error Codes..............................................................................D-1

TFP2A FiberMaster Module-Level Service Manual vii

List of Illustrations

Figure 1-1. Connector Options ..........................................................................1-28

Figure 1-2. Installing Optical Modules ..............................................................1-30

Figure 1-3. Interconnect Circuit Board Connectors.........................................1-31

Figure 1-4. Installing the Module Spacer: Two-Module Configuration...........1-32

Figure 1-5. Front-Panel Option Covers .............................................................1-33

Figure 1-6. Loading Paper into the Internal Printer .........................................1-34

Figure 2-1. Features on the Acquisition Screen.................................................2-4

Figure 2-2. Acquisition Screen Expansion—Overview (top),

Figure 2-3. Front Panel Overview ........................................................................2-8

Figure 2-4. Back Panel..........................................................................................2-9

Figure 4-1. Cleaning and Changing the Universal Connector ..........................4-5

Figure 4-2. Terminal Interface Connector...........................................................4-9

Figure 4-3. The Start-Up Screen ........................................................................4-10

Figure 4-4. Front-Panel Loss..............................................................................4-17

Figure 4-5. Dynamic Range Measurements......................................................4-19

Figure 4-6. Measuring the Backscatter .............................................................4-27

Figure 4-7. Noise Acquisition.............................................................................4-28

Figure 4-8. Measuring the Noise Floor..............................................................4-30

Figure 4-9. Dead Zone (Attenuation) Measurement.........................................4-31

Figure 4-10. Dead Zone (Event) Measurement .................................................4-33

Figure 4-11. Loss Cursors Measuring Noise....................................................4-36

Figure 4-12. Zero Distance Measurement.........................................................4-38

Figure 4-13. Two Acquisitions with Loss Variations .......................................4-40

Figure 4-14. Waveforms Superimposed: Variation in Fiber............................4-41

Figure 4-15. Waveforms Superimposed: Variation in Vertical System..........4-42

Figure 4-16. Variation Superimposed on Linear Backscatter.........................4-43

Figure 4-17. Two-Point Cursors Parallel to Waveforms ..................................4-44

Figure 4-18. Measuring Positive Non-Linearity................................................4-45

Figure 4-19. Measuring Negative Non-Linearity...............................................4-46

Figure 4-20. Test Set-Up with Optical Attenuator ............................................4-47

Figure 4-21. Backscatter on Reference Waveform ..........................................4-48

Figure 4-22. Test Set-Up with Optical Attenuator ............................................4-51

Figure 4-23. VCO Tune Voltage Adjustment.....................................................4-60

Figure 4-24. Printer Board Adjustment .............................................................4-61

Figure 4-25. Display Board Voltage Adjustment..............................................4-64

Figure 4-26. CRT Ring Magnet and Yoke Adjustments ...................................4-66

Figure 4-27. Display Board Video Adjustments ...............................................4-68

Figure 4-28. Run Diagnostics Menu ..................................................................4-69

Figure 4-29. Set Options Menu ..........................................................................4-70

Figure 4-30. Connector Orientation...................................................................4-75

Figure 4-31. Removing Instrument Covers.......................................................4-76

and Expanded View (bottom)....................................................2-5

viii TFP2A FiberMaster Module-Level Service Manual

List of Illustrations

Figure 4-32. Removing Front-Panel Assembly.................................................4-77

Figure 4-33. Removing the Back-Panel Assembly and Plug-In

Optical Module(s).....................................................................4-78

Figure 4-34. Removing the Control Board........................................................4-80

Figure 4-35. Removing the Printer Assembly...................................................4-81

Figure 4-36. Removing the Color Shutter .........................................................4-82

Figure 4-37. Removing the Monochrome Filter................................................4-83

Figure 4-38. Detaching the Display Board........................................................4-84

Figure 4-39. Detaching the CRT and Removing the

CRT/Display Assembly............................................................4-85

Figure 4-40. Removing the PSI Power Supply..................................................4-86

Figure 4-41. Disconnecting the PSI Power Supply ..........................................4-87

Figure 4-42. Removing the IPD Power Supply .................................................4-88

Figure 4-43. Disconnecting the IPD Power Supply..........................................4-89

Figure 4-44. Disconnecting the Line Filter Assembly......................................4-90

Figure 4-45. Removing the Line Filter Assembly.............................................4-91

Figure 4-46. Removing the DC Interlock Ring..................................................4-92

Figure 4-47. Removing the DC Filter Board......................................................4-93

Figure 4-48. Removing the MDI Power Supply.................................................4-94

Figure 4-49. Disconnecting the MDI Power Supply .........................................4-95

Figure 4-50. Removing the MDI DC Option......................................................4-96

Figure 4-51. Removing the Floppy-Disk Drive..................................................4-97

Figure 4-52. Removing the Module Support Board .........................................4-98

Figure 4-53. Detaching the Interconnect Board ...............................................4-99

Figure 4-54. Detaching the Air Baffle and Fan from the Back Panel............4-100

Figure 4-55. Detaching the Fan from the Back Panel ....................................4-101

Figure 4-56. Removing the Power Switch Coupler ........................................4-102

Figure 4-57. Removing the Power Switch Bracket.........................................4-103

Figure 4-58. Detaching the Ground Wires from the Chassis ........................4-103

Figure 4-59. Removing the Line Filter and Wire Set ......................................4-104

Figure 5-1. Electrical Module Overview ..............................................................5-5

Figure 5-2. Case ....................................................................................................5-6

Figure 5-3. Front Panel .........................................................................................5-8

Figure 5-4. Chassis with CRT and Circuit Boards ...........................................5-10

Figure 5-5. Power Supply: PSI ...........................................................................5-11

Figure 5-6. Power Supply: IPD...........................................................................5-13

Figure 5-7. Power Supply: MDI ..........................................................................5-14

Figure 5-8. Chassis-Mounted Electrical Parts..................................................5-16

Figure 5-9. Back ..................................................................................................5-17

Figure 5-10. Thermal Printer with Cables .........................................................5-18

Figure 5-11. Internal RAM...................................................................................5-19

Figure 5-12. DC Power: Option 17 (PSI and IPD)..............................................5-21

Figure 5-13. DC Power: Option 17 (MDI) ...........................................................5-23

Figure 5-14. Disk Drive Assembly .....................................................................5-24

Figure C-1. Firmware Version Number on the Start-Up Screen.......................C-1

TFP2A FiberMaster Module-Level Service Manual ix

List of Tables

Table 1-1. Display Range—Vertical System .......................................................1-8

Table 1-2. Display Range—Horizontal System...................................................1-9

Table 1-3. Display..................................................................................................1-9

Table 1-4. Keyboard..............................................................................................1-9

Table 1-5. Hardcopy............................................................................................1-10

Table 1-6. Mass Storage .....................................................................................1-10

Table 1-7. Operational Characteristics..............................................................1-11

Table 1-8. Physical Characteristics...................................................................1-11

Table 1-9. Environmental Characteristics.........................................................1-12

Table 1-10. FS1300 Singlemode Optical Module..............................................1-14

Table 1-11. FS1500 Singlemode Optical Module..............................................1-15

Table 1-12. FS1315 Singlemode Optical Module..............................................1-16

Table 1-13. FG1300 Singlemode Optical Module .............................................1-17

Table 1-14. FG1315 Singlemode Optical Module .............................................1-18

Table 1-15. FL1300 Singlemode Optical Module..............................................1-19

Table 1-16. FL1500 Singlemode Optical Module..............................................1-20

Table 1-17. FL1315 Singlemode Optical Module..............................................1-21

Table 1-18. FM8500 Multimode Optical Module................................................1-22

Table 1-19. FM1300 Multimode Optical Module................................................1-23

Table 1-20. FM8513 Multimode Optical Module................................................1-24

Table 1-21. Mainframe Options..........................................................................1-25

Table 1-22. Standard Accessories.....................................................................1-25

Table 1-23. Optional Accessories......................................................................1-25

Table 1-24. System Options ...............................................................................1-26

Table 1-25. System Multimode Options ............................................................1-26

Table 1-26. System Singlemode Options..........................................................1-27

Table 1-27. Option Accessories.........................................................................1-27

Table 4-1. External Inspection Checklist ............................................................4-3

Table 4-2. Internal Inspection Checklist..............................................................4-6

Table 4-3. Dynamic Range Pulse Width and Distance Span...........................4-30

Table 4-4. Distance Accuracy Tolerance ..........................................................4-38

Table 4-5. Small Linearity Pulse Width Settings ..............................................4-51

Table 4-6. Loss Measurement Accuracy Pulse Width Settings......................4-53

Table 4-7. Tools Required for Module-Level Maintenance and Repair ..........4-75

Table B-1. GPIB Connections .............................................................................B-1

Table B-2. RS-232 Connections (DCE)...............................................................B-2

Table C-1. Firmware Versions and Features .....................................................C-2

Table D-1. File System Error Codes ...................................................................D-1

Table D-2. Flash Memory Error Codes...............................................................D-3

Table D-3. LED Error Codes................................................................................D-4

Table D-4. Phase 1 Error Codes..........................................................................D-5

Table D-5. Phase 2 Error Codes..........................................................................D-5

x TFP2A FiberMaster Module-Level Service Manual

Safety Information

The general safety information in these pages is for both operating and servicing personnel. In addition, specific warnings and cautions appear throughout the manual where they apply.

Definition of Terms and Symbols

In this manual, a CAUTION flag identifies a potential for equipment or other property damage.

A WARNING flag identifies a potential for personal injury or property damage. A DANGER flag identifies an immediate hazard to personal safety or property. Symbols that may be marked on the equipment indicate the following:

DANGER—High Voltage

Power Source

This product is designed to operate from a power source that will not apply more than 250 volts RMS between the supply conductors or between the supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

ATTENTION—refer to manual

Protective ground (earth) terminal

TFP2A FiberMaster Module-Level Service Manual xi

Safety Summary

Grounding the Instrument

The instrument is grounded through the grounding conductor of the power cord. To avoid electric shock, plug the power cord into a properly wired receptacle before connecting to the product input or output terminals.

Danger Arising from Loss of Ground

If you lose the protective ground connection, all accessible conductive parts (including knobs and controls that appear to be insulating) can render an electric shock.

Use the Proper Power Cord

Use only the power cord and connector specified for your product. Use only a power cord in good condition. Refer cord and connector changes to qualified service personnel.

Use the Proper Fuse

To avoid fire hazard, use only a fuse of the correct type, voltage rating, and current rating as specified in the parts list for your product. Refer fuse replacement to qualified service personnel.

Do Not Operate in Explosive Atmospheres

To avoid explosion, do not operate this product in an explosive atmosphere unless it has been specifically certified for such operation.

Do Not Remove Covers or Panels

To avoid personal injury, do not remove the product covers or panels. Do not operate the product without the covers or panel properly installed.

Laser Radiation

Avoid eye exposure to the laser output and open-ended fibers by covering the end or directing the output at a non-reflective surface.

Class 1 laser product under the Radiation Control and Health Safety Act of 1968.

Repair

Refer all repair problems to qualified service personnel.

FiberMaster has been classified as a

xii TFP2A FiberMaster Module-Level Service Manual

1 Introduction:

the FiberMaster OTDR

ATTENTION!

Read the Safety Information section located at the front of this manual before operating or servicing FiberMaster.

If you have questions about using or servicing FiberMaster, or have special application problems, in the U.S. and Canada call our toll-free help line,

1-800-835-9433, or contact your local Tektronix representative.

Product Description

The TEKTRONIX TFP2A FiberMaster Optical Time-Domain Reflectometer (OTDR) is

an optical-fiber test instrument capable of measuring loss characteristics and displaying faults, splices, and other fiber events in singlemode and multimode optical fibers.

FiberMaster applies pulses of light to the fiber under test via the optical output

connector. As the pulses travel through the fiber, some light is reflected back to the instrument. These reflections are processed to display a visual representation of the fiber on FiberMaster’s cathode ray tube (CRT), where you can make distance and loss measurements on the fiber under test.

The CRT display is a time plot, read from left to right. The trace starts with the

outgoing pulse, and the time difference is converted to distance in the measurement process. When you view a typical fiber display, events that are further down the fiber appear to the right (later in time). Loss is measured on the CRT’s vertical scale.

NOTE

TFP2A FiberMaster Module-Level Service Manual 1-1

This manual explains how to maintain the TFP2A FiberMaster product line, which includes mainframe models TFP2A (color monitor) and TFP2AM (monochrome monitor), configured with various options. (Refer to appendix A,

Options

"FiberMaster" or "TFP2A," to refer to both the TFP2A and TFP2AM models.

.) In this manual, the instrument is referred to generically as

Accessories and

Chapter 1: Introduction

Modular, Plug-In Laser Sources

❏ The FiberMaster OTDR was designed using a modular approach that allows you

to choose options that answer your specific test and measurement applications. You can upgrade your instrument configuration as your system requirements change. FiberMaster can accommodate 850-nanometer (nm) multimode, 1300nm multimode, 1310-nm singlemode, and 1550-nm singlemode laser sources in one or two plug-in modules. The modules can contain either two singlemode or two multimode lasers, or any single laser, allowing the instrument to be configured with one to all four wavelengths.

❏ Temperature-controlled laser light sources ensure stable wavelength and optical

output for highly accurate measurements.

Accurate, High-Speed Data Acquisition and Measurement

❏ The internal 32-bit microprocessor performs up to 16 million high-speed

averages per acquisition, maximizing the signal-to-noise ratio, giving a clear display of fiber events.

❏ FiberMaster measures a specific fiber feature, with single-keystroke

convenience. In addition, manual adjustments provide extended flexibility in interpreting the fiber data.

❏ An expand function allows you to magnify any portion or feature on the displayed

fiber acquisition.

❏ FiberMaster’s high-density acquisition capability offers extended expansion

capacity and highly accurate measurements.

❏ A masking function can be performed automatically, or you can set manual

masks to reduce dead zones caused by large Fresnel reflections, improving measurement resolution.

Automatic and Manual Event Marking

❏ The instrument’s event-marking function automatically locates and measures

events on the fiber under test that have splice losses above a user-specified threshold, or you can also mark events manually.

❏ An event table is compiled displaying the measurements for each marked event.

You can edit and print out this table, plus enter notes and mapping information about each event.

1-2 TFP2A FiberMaster Module-Level Service Manual

Extended Memory and Storage Capacity

❏ FiberMaster offers both a current memory, containing the current data

acquisition, and a reference memory, for previously acquired fiber waveform data. A dual-trace mode makes it possible to display the contents of both current and reference memory simultaneously, allowing you to compare a current optical-fiber acquisition to historical data.

❏ Mass-storage devices (the standard floppy-disk drive and optional internal RAM)

permit unlimited storage of waveform and settings data on both removable and internal media.

Hardcopy Options

❏ You can choose the optional high-speed internal thermal printer, or use

FiberMaster with either an IEEE 488 general-purpose interface bus (GPIB) external plotter or printer, or an RS232 external plotter or printer. One press of a button on the instrument’s front panel provides a 15-second hard copy of the displayed waveform and instrument settings on the internal printer.

Chapter 1: Introduction

Remote Control Capability

❏ The FiberMaster OTDR can be operated under the remote control of an

instrument controller or a computer with a GPIB interface, using an IEEE 488 general-purpose interface bus, or via the RS-232 serial interface.

Additional Features

❏ An easy-to-use menu system simplifies setting instrument measurement

parameters.

❏ You can upload and download waveform and settings data using the RS232

interface and XModem protocol.

❏ The 7-inch diagonal, high-resolution color or monochrome CRT provides a

comprehensive on-screen readout of waveform and measurement data, and instrument settings.

❏ Online help displays context-sensitive operator assistance at the press of a

button.

❏ Rugged, portable construction is also lightweight—under 35 pounds (15

kilograms).

TFP2A FiberMaster Module-Level Service Manual 1-3

Chapter 1: Introduction

Using this Manual

This manual is for servicing the TFP2A FiberMaster OTDR. To prevent injury to

yourself or damage to the OTDR, do not attempt service unless:

❏ You are a qualified service person, ❏ You have read the

manual.

❏ You have read the

When using this manual for servicing, be sure to observe all warnings, cautions, and

notes.

Strategy for Servicing

NOTE

Throughout this manual, any field-replaceable component, assembly, or part of this optical time-domain reflectometer is referred to generically as a module.

This manual contains all the information needed for periodic maintenance of the

FiberMaster OTDR, as well as all information for corrective maintenance down to the module level. This means that the procedures, diagrams, and other troubleshooting aids help isolate failures to a specific module, rather than to components of that module. Once a failure is isolated, replace the module with a new unit obtained from the factory.

All modules are listed in chapter 5,

module, use the fault isolation procedures given in chapter 4, remove and replace any failed module, follow the instructions in the same chapter.

Operator and Service Safety Summary

Strategy for Servicing

Replaceable Parts

section in this chapter.

. To isolate a failure to a

at the beginning of this

Maintenance

. To

1-4 TFP2A FiberMaster Module-Level Service Manual

Manual Structure

The FiberMaster Module-Level Service Manual consists of six chapters and two

appendices, containing the following information:

Chapter 1: Introduction

❏ Chapter 1,

unpacking and repacking instructions, and instrument specifications.

❏ Chapter 2,

front- and rear-panel controls and connectors, at a level appropriate for servicing the instrument. (For complete operating instructions, refer to the

User Manual

❏ Chapter 3,

instrument’s operation, as well as a block-level diagram.

❏ Chapter 4,

corrective maintenance on the FiberMaster, including inspection and cleaning, performance verification and adjustment, troubleshooting, and module removal and replacement procedures.

❏ Chapter 5,

and exploded-view drawings of their locations in the instrument.

❏ Chapter 6, ❏ Appendices include data sheets for recording instrument performance

information, GPIB and RS232 connection tables, instructions on upgrading firmware, and a listing of error codes.

Manual Conventions

Introduction

, provides a description of the FiberMaster OTDR,

General Operating Instructions

Theory of Operation

Maintenance

, contains the information needed to do periodic and

Replaceable Parts

Diagrams

, contains module-level block diagrams.

, contains a block-level description of the

, includes a list of module-level replaceable parts

, describes the functions of each of the

FiberMaster

This manual uses certain conventions that you should be familiar with before doing

service.

Terminology used in the FiberMaster manuals is in accordance with industry practice.

Abbreviations are in accordance with ANSI Y1.1-1972, with exceptions and additions explained in parentheses after the abbreviation. Graphic symbology is based on ANSI Y32.2-1975. Logic symbology is based on ANSI Y32.14-1973 and manufacturers’ data books or sheets. A copy of ANSI standards can be obtained from the Institute of Electrical and Electronic Engineers, New York, New York 10017.

Modules

Throughout this manual, any replaceable component, assembly, or part of the

FiberMaster OTDR is referred to generically as a module. In general, a module is an assembly, (e.g., a circuit board), rather than a component, (e.g., a resistor or integrated circuit).

TFP2A FiberMaster Module-Level Service Manual 1-5

Chapter 1: Introduction

Warranty Information

Tektronix warrants that this product will be free from defects in materials and

workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair or replace the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.

In order to obtain service under this warranty, the customer must notify Tektronix of

the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. The customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to the customer if the shipment is to a location within the same country as the service center. The customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper

use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair, or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

This warranty is given by Tektronix with respect to this product in lieu of any other

warranties, express or implied. Tektronix and its vendors disclaim any implied warranties of merchantability or fitness for use for a particular purpose. Tektronix’ responsibility to repair or replace defective products is the sole and exclusive remedy provided to the customer for breach of this warranty. Tektronix and its vendors will not be liable for any direct, special, incidental, or consequential damages irrespective of whether Tektronix or the vendor has advance notice of the possibility of such damages.

1-6 TFP2A FiberMaster Module-Level Service Manual

Tektronix Service

Tektronix provides service to cover repairs under warranty as well as other services

that may provide a cost-effective answer to your service needs. Tektronix service technicians, trained on Tektronix products, are best equipped to service your FiberMaster OTDR. Our technicians are appraised of the latest information on improvements to the product, as well as the latest new options available.

Warranty Service

Tektronix warrants this product for one year from date of purchase. Tektronix

technicians provide all warranty service at the factory during this period. Contact your local Tektronix representative for more information.

Self Service

Tektronix supports repair to the module level by providing module exchange and

module repair and return services.

Chapter 1: Introduction

NOTE

Module-level service is available only for selected modules, under specific conditions. In the U.S. and Canada call 1-800-835-9433 for assistance with module exchange and repair, or contact your local Tektronix representative.

Module Exchange—this service reduces downtime for repair by allowing you to

exchange most modules for remanufactured ones. Tektronix ships you an updated and tested exchange module from the Redmond, Oregon service center within 24 hours. Each module comes with a 90-day service warranty.

Module Repair and Return—This service returns your module to you within 10 days.

The module you send to Tektronix is repaired, tested, and returned to you from the Redmond, Oregon service center. It is not updated to match current modules of the same type. Again, each module comes with a 90-day service warranty.

For More Information

In the U.S. and Canada, call 1-800-835-9433 for more information on warranty and

service for the FiberMaster OTDR, or contact your local Tektronix representative.

TFP2A FiberMaster Module-Level Service Manual 1-7

Chapter 1: Introduction

Specifications

Electrical Characteristics

The following characteristics and features apply to the FiberMaster OTDR mainframe

after a warmup period of at least 15 minutes. All loss numbers reflect one-way measurements unless otherwise specified.

Table 1-1. Display Range—Vertical System

Vertical range

Loss measurements

Loss readout resolution

Accuracy

Two point, splice loss, and LSA fiber loss:

FM/FS/FG series

FL series

1 dB to 50 dB, overview 1 dB to 100 dB, expanded view

0.001 dB to 0.01 dB

±0.05 dB/dB, from 7 dB above the RMS noise floor (SNR = 1) to 30 dB on the screen. Maximum error of ±0.2 dB from +7 dB above the RMS noise floor to top of backscatter.

±0.02 dB/dB, from 15 dB to 35 dB on the screen.

1-8 TFP2A FiberMaster Module-Level Service Manual

Table 1-2. Display Range—Horizontal System

Chapter 1: Introduction

Distance range Distance measurements

Cursor resolution (min) FM/FS/FG series:

850 nm MM

1300 nm MM/ 1310 nm SM/ 1550 nm SM

FL series:

1310 SM/

1550 SM Index of refraction range Distance measurement

accuracy

Number of displayed waveform points

1 m to 200 km

5 cm to 2 m, normal density; 1 cm to 50 cm, high density

20 cm to10 m, normal density; 10 cm to 2 m, high density

2 m to 10 m, normal density; no high density

1.4000 to 1.6000

±0.001%, ±minimum cursor resolution ±uncertainty in index of refraction

>16,000 maximum for each normal and high density

Table 1-3. Display

Size Resolution Display type

Color Monochrome

Table 1-4. Keyboard

Connector Compatibility

7 inches (17.5 cm) diagonal 640 by 480 pixels

Two-color system giving three colors, with five levels each Five-level gray scale

5-pin RJ11 Compatible with IBM AT keyboards (input

only), but complete compatibility can be guaranteed only with Tektronix keyboard Option 19

TFP2A FiberMaster Module-Level Service Manual 1-9

Chapter 1: Introduction

Table 1-5. Hardcopy

Internal printer

Resolution Print dimensions

External plotter

External printer

Table 1-6. Mass Storage

Floppy disk drive

Size Capacity Format

Internal RAM

Capacity

High-speed, high-resolution dot matrix, thermal 150 dots/in vertical and horizontal 4 in by 5 in (10.2 cm by 12.7 cm)

HP-GL compatible (Tektronix HC100): GPIB and RS-232 connections

Epson FX-compatible: RS232 connection Hewlett-Packard ThinkJet-compatible: GPIB and RS-232 connections PostScript-compatible: RS-232 connection

3.5 in (8.9 cm)

1.44 Mbyte or 720 Kbyte MS-DOS compatible

1 Mbyte

1-10 TFP2A FiberMaster Module-Level Service Manual

Operational Characteristics

Table 1-7. Operational Characteristics

Power requirements

AC operation (AC only)

Chapter 1: Introduction

90 - 130 VAC, 47 - 440 Hz 180 - 250 VAC, 47 - 73 Hz

(auto select) AC operation (AC with DC option) DC operation

Power supply rating

AC operation

DC operation

Module capacity

Safety

Physical Characteristics

Table 1-8. Physical Characteristics

90 - 130 VAC, 47 - 73 Hz

11 - 16 VDC

250 watts max.

315 VA max.

200 VA max. (watts)

Two dual-wavelength modules

maximum, for a total of four

wavelengths

UL 1244, UL 3111-1

CSA: CAN/CSA C22.2 No. 231

CAN/CSA -C22.2 No. 1010.192

IEC 1010-1

EN 61010-1

Weight

Dimensions

TFP2A FiberMaster Module-Level Service Manual 1-11

33 lbs (15 kg), mainframe configured with floppydisk drive, internal printer, and one optical module

Overall dimensions, including front cover, handle, and feet: Length, 25 in (63.7 cm); width, 18 in (46 cm); height, 7 in (18 cm)

Chapter 1: Introduction

Environmental Characteristics

Table 1-9. Environmental Characteristics

Temperature

Mainframe

Operating: +5˚ to +50˚ C Non-operating: -40˚ to +60˚ C

With internal printer

Without floppy-disk drive

Humidity (operating)

Mainframe With internal printer Without floppy-disk drive

Altitude (maximum)

Operating Non-operating

Sine vibration

Operating

Disk drive non-operating

Shock (maximum)

Operating

Operating: +5˚ to +40˚ C Non-operating: -20˚ to +60˚ C

Operating: -10˚ to +55˚ C Non-operating: -40˚ to +70˚ C

8% to 75% (+5%, -0%), noncondensing 35% to 75% (+5%, -0%), noncondensing 5% to 90% (+5%, -0%), noncondensing

15,000 ft (4.6 km) 50,000 ft (15.2 km) Tek 062-2847-00, Class 3 (exceeds MIL-T28800E)

Frequency sweep: 10 to 55 Hz Loading: 0.5G, maximum

Frequency sweep: 10 to 55 Hz Loading: 2.0G, maximum

Disk drive non-operating

Bench handling Transit drop Water resistance Fungus resistance

1-12 TFP2A FiberMaster Module-Level Service Manual

30G MIL-T-28800E MIL-T-28800E Drip proof, tested with front cover on Enclosure and electronics are fungus inert by

design

Table 1-9. Environmental Characteristics, cont.

Chapter 1: Introduction

Electromagnetic compatibility

Emissions: Radiated emissions

Mains Current Harmonics Conducted emissions

Magnetic emissions Immunity: RF radiated

Electrostatic discharge Fast transients Surge

Dropout

EC Council Directive 89/336/EEC

EN 50081-1 FCC Part 15, Subpart J, Class A

EN55022, Class B IEC 1000-3-2 FCC Part 15, Subpart J, Class A

EN55022, Class B EN60555-2

Vfg 243, Class B EN 50082-1 IEC 1000-4-3

IEC 1000-4-2 IEC 1000-4-4 IEC 1000-4-5 IEC 1000-4-11

TFP2A FiberMaster Module-Level Service Manual 1-13

Chapter 1: Introduction

FS1300 Singlemode Optical Module

Table 1-10. FS1300 Singlemode Optical Module

Dynamic Range

Dead Zone Pulse End Loss Width SNR = 1 (dB)

Detect. (dB)

Meas. (m)

Event (m)

10 µs/1000 m 29.5 38.0 1080 1050 4000 ns/400 m 27.5 38.0 480 420 2000 ns/200 m 23.5 38.0 240 220 1000 ns/100 m 22.0 38.0 140 110

500 ns/50 m 20.5 38.0 70 55 200 ns/20 m 18.5 38.0 40 25 100 ns/10 m 17.0 38.0 25 12

50 ns/5 m 15.5 38.0 20 7 50 ns/5 m HR 12.0 34.0 15 7 20 ns/2 m HR 10.5 34.0 NA 5 10 ns/1 m HR 9.0 34.0 NA 3

Operating wavelength: 1310 nm ± 20 nm Masking: menu selectable

❏ Auto-QuickMask ❏ Auto-AccuMask ❏ Manual-QuickMask ❏ Manual-AccuMask

Full-screen display range: 50 m to 200 km Laser safety: Class 1, 21 CFR 1040 Temperature: -10˚ to +55˚ C operating; -40˚ to +70˚ C non-operating Humidity: Up to 90% relative humidity (+5, -0%) Weight: 4.4 lbs (<2 kg) Dimensions: 1.75 in (4.5 cm) by 5.5 in (14.0 cm) by 17.5 in (44.5 cm)

Dynamic range specifications are based on 32,000 averages. Actual averaging times range from 30 seconds to three minutes, depending on instrument settings. For 3 Sigma values, subtract 2.4 dB from SNR=1 values.

Dynamic range, SNR = 1 is the one-way difference between the extrapolated backscatter level at the start of the fiber and the RMS noise level.

Dynamic range, end detection is the one-way difference between the top of a 4% Fresnel reflection at the start of the fiber and the 3 Sigma (99.5%) level of the noise.

Dead zone, loss measurement is the minimum distance after any reflective event

on the display to measure loss to within 0.5 dB of backscatter.

Dead zone, event (two-point spatial resolution) is the minimum distance after any reflection necessary to determine accurately the distance to another event (based on a minimum recover of 1.5 dB down from the top of the first reflection).

1-14 TFP2A FiberMaster Module-Level Service Manual

FS1500 Singlemode Optical Module

Table 1-11. FS1500 Singlemode Optical Module

Chapter 1: Introduction

Dynamic Range

Dead Zone Pulse End Loss Width SNR = 1 (dB)

Detect. (dB)

Meas. (m)

Event (m)

10 µs/1000 m 26.5 36.0 1080 1050 4000 ns/400 m 24.5 36.0 480 420 2000 ns/200 m 20.5 36.0 240 220 1000 ns/100 m 19.0 36.0 140 110

500 ns/50 m 17.5 36.0 70 55 200 ns/20 m 15.5 36.0 40 25 100 ns/10 m 14.0 36.0 25 12

50 ns/5 m 12.5 36.0 20 7 50 ns/5 m HR 9.0 33.0 18 7 20 ns/2 m HR 7.5 33.0 NA 5 10 ns/1 m HR 5.0 33.0 NA 3

Operating wavelength: 1550 nm ± 20 nm Masking: menu selectable

❏ Auto-QuickMask ❏ Auto-AccuMask ❏ Manual-QuickMask ❏ Manual-AccuMask

Dynamic range specifications are based on 32,000 averages. Actual averaging times depend on instrument settings. For 3 Sigma values, subtract 2.4 dB from SNR=1 values.

Dynamic range, SNR = 1 is the one-way difference between the extrapolated backscatter level at the start of the fiber and the RMS noise level.

Dynamic range, end detection is the one-way difference between the top of a 4% Fresnel reflection at the start of the fiber and the 3 Sigma (99.5%) level of the noise.

Dead zone, loss measurement is the minimum distance after any reflective event

on the display to measure loss to within 0.5 dB of backscatter.

TFP2A FiberMaster Module-Level Service Manual 1-15

Chapter 1: Introduction

FS1315 Singlemode Optical Module

Table 1-12. FS1315 Singlemode Optical Module

Dynamic Range

Dead Zone

Pulse End Loss

Width SNR = 1 (dB)

Detect. (dB)

Meas. (m)

Event (m)

10 µs/1000 m 29.5/26.5 38.0/36.0 1080 1050 4000 ns/400 m 27.5/24.5 38.0/36.0 480 420 2000 ns/200 m 23.5/20.5 38.0/36.0 240 220 1000 ns/100 m 22.0/19.0 38.0/36.0 140 110

500 ns/50 m 20.5/17.5 38.0/36.0 70 55 200 ns/20 m 18.5/15.5 38.0/36.0 40 25 100 ns/10 m 17.0/14.0 38.0/36.0 25 12

50 ns/5 m 15.5/12.5 38.0/36.0 20 7 50 ns/5 m HR 12.0/9.0 34.0/33.0 15/18 7 20 ns/2 m HR 10.5/7.5 34.0/33.0 NA 5 10 ns/1 m HR 9.0/5.0 34.0/33.0 NA 3

Operating wavelengths: 1310/1550 nm ± 20 nm Masking: menu selectable

❏ Auto-QuickMask ❏ Auto-AccuMask ❏ Manual-QuickMask ❏ Manual-AccuMask

Dynamic range specifications are based on 32,000 averages. Actual averaging times depend on instrument settings. For 3 Sigma values, subtract 2.4 dB from SNR=1 values.

Dynamic range, SNR = 1 is the one-way difference between the extrapolated backscatter level at the start of the fiber and the RMS noise level.

Dynamic range, end detection is the one-way difference between the top of a 4% Fresnel reflection at the start of the fiber and the 3 Sigma (99.5%) level of the noise.

Dead zone, loss measurement is the minimum distance after any reflective event

on the display to measure loss to within 0.5 dB of backscatter.

1-16 TFP2A FiberMaster Module-Level Service Manual

FG1300 Singlemode Optical Module

Table 1-13. FG1300 Singlemode Optical Module

Chapter 1: Introduction

Dynamic Range

Dead Zone Pulse End Loss Width SNR = 1 (dB)

Detect. (dB)

Meas. (m)

Event (m)

10 µs/1000 m 31.0 38.0 1150 1150 4000 ns/400 m 28.5 38.0 550 475 2000 ns/200 m 25.5 38.0 250 225 1000 ns/100 m 24.0 38.0 150 110

500 ns/50 m 21.5 38.0 80 55 200 ns/20 m 19.5 38.0 55 25 100 ns/10 m 18.0 38.0 50 12

50 ns/5 m 16.5 38.0 45 10 50 ns/5 m HR 13.5 34.0 30 7 20 ns/2 m HR 11.5 34.0 25 5 10 ns/1 m HR 9.5 34.0 N/A 4

Operating wavelength: 1310 nm ± 20 nm Masking: not applicable Full-screen display range: 50 m to 200 km Laser safety: Class 1, 21 CFR 1040 Temperature: -10˚ to +55˚ C operating; -30˚ to +70˚ C non-operating Humidity: Up to 90% relative humidity (+5, -0%) Weight: 4.4 lbs (<2 kg) Dimensions: 1.75 in (4.5 cm) by 5.5 in (14.0 cm) by 17.5 in (44.5 cm)

Dynamic range specifications are based on 32,000 averages. Actual averaging

times depend on instrument settings.

Dynamic range, SNR = 1 is the one-way difference between the extrapolated

backscatter level at the start of the fiber and the RMS noise level.

Dynamic range, end detection is the one-way difference between the top of a 4%

Fresnel reflection at the start of the fiber and the 3 Sigma (99.5%) level of the noise.

Dead zone, loss measurement is the minimum distance after any reflective event

on the display to measure loss to within 0.5 dB of backscatter. Specifications are based on reflections not to exceed a return loss of 40 dB.

Performance specifications are at 25˚ C.

TFP2A FiberMaster Module-Level Service Manual 1-17

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