Tektronix VXOA41 Manual
  1. Manuals
  2. Brands
  3. Tektronix Manuals
  4. Test Equipment
  5. VXOA41
  6. Manual
Tektronix VXOA41 Manual

Tektronix VXOA41 Manual

Optical attenuator
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
A l l t e s t I n s t r u me n t s , I n c .
5 0 0 C e n t r a l A v e .
F a r mi n g d a l e , N J 0 7 7 2 7
P : ( 7 3 2 ) 9 1 9 - 3 3 3 9
F : ( 7 3 2 ) 9 1 9 - 3 3 3 2
a l l t e s t . n e t
s s a l e s @ a l l t e s t . n e t
T h e t e s t & me a s u r e me n t
e q u i p me n t y o u n e e d a t
t h e p r i c e y o u w a n t .
A l l t e s t c a r r i e s t h e w o r l d ' s l a r g e s t s e l e c t i o n o f
u s e d / r e f u r b i s h e d b e n c h t o p t e s t & me a s u r e me n t
e q u i p me n t a t 5 0 % t h e p r i c e o f n e w .
O O u r e q u i p me n t i s g u a r a n t e e d w o r k i n g , w a r r a n t i e d , a n d
a v a i l a b l e w i t h c e r t i f i e d c a l i b r a t i o n f r o m o u r i n - h o u s e s t a f f
o f t e c h n i c i a n s a n d e n g i n e e r s .
• 1 0 + f u l l t i me t e c h n i c i a n s w i t h o v e r 1 5 0 y e a r s o f
s p e c i a l i z a t i o n
• 9 0 d a y w a r r a n t y & 5 d a y r i g h t o f r e t u r n o n a l l
e q u i p me n t
• • 1 - 3 y e a r w a r r a n t i e s f o r n e w a n d
p r e mi u m- r e f u r b i s h e d e q u i p me n t
• E v e r y u n i t t e s t e d t o O E M s p e c i f i c a t i o n s
• S a t i s f a c t i o n g u a r a n t e e d
Y o u h a v e p l a n s , w e w i l l h e l p y o u a c h i e v e t h e m.
A n y p r o j e c t . A n y b u d g e t .
t
G e t a q u o t e t o d a y !
C C a l l ( 7 3 2 ) 9 1 9 - 3 3 3 9 o r e ma i l s a l e s @a l l t e s t . n e t .

Advertisement

Table of Contents
loading

Related Manuals for Tektronix VXOA41

Summary of Contents for Tektronix VXOA41

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 User Manual VXOA41 Optical Attenuator 070-8777-01...
  • Page 3 Copyright Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000...
  • Page 4 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located.

  • Page 6: Table Of Contents

    ..........3–25 VXOA41 Optical Attenuator User Manual...

  • Page 7: Table Of Contents

    ........H–1 Glossary and Index VXOA41 Optical Attenuator User Manual...
  • Page 8 Table of Contents List of Figures Figure 1-1: Logical Address Switch location on the VXOA41 ..1–4 Figure 1-2: Removing the VXOA41 from the Mainframe ..1–5 Figure 2-1: VXOA41 Front Panel (Option 1 Shown) .
  • Page 9 ........3–10 Table 3–7: VXOA41 Device Commands and Parameters ..

  • Page 10: Safety Summary

    Safety Summary You might be eager to begin using your VXOA41, but please take a moment to review these safety precautions. They are provided for your protection and to prevent damage to the VXOA41 Optical Attenuator. This safety information applies to all operators and service personnel.
  • Page 11 To prevent damage to your eyes, avoid looking into the optical output port while there is an optical signal connected to the input port. Even if the VXOA41 is switched off, light can pass through the attenuator. Always attach the output port to a receiver before attaching the source signal to the input port.

  • Page 12: Getting Started

    Getting Started...

  • Page 14: Getting Started

    VXOA41 Optical Attenuator is a high-performance instrument used to attenuate optical signals. Some of the outstanding characteristics of the VXOA41 are: Attenuation to 60 dB — the VXOA41 can attenuate signals up to 60 dB in steps of 0.01 dB. A shutter provides greater than 100 dB attenuation.
  • Page 15 Getting Started 3. Ensure that you have the logical address switches on the VXOA41 set to the desired address (see Figure 1-1). 4. Ensure that the VXOA41 is properly installed in the VXI mainframe. 5. Verify that you can communicate with the VXI module as described in the Checkout Procedure.
  • Page 16 Always wear a grounded wrist strap, or equivalent, while installing or removing the VXOA41 1. The VXOA41 contains a DIP switch that you use to set the module address within the mainframe. Figure 1-1 shows the switch location. The switch can be accessed through the hole in the side panel.
  • Page 17 ON/STANDBY switch on the mainframe are in the OFF and STANDBY positions, respectively. CAUTION. If you install the VXOA41 in a D-size mainframe, make sure that you connect the P1 and P2 connectors of the module to the P1 and P2 connectors of the mainframe.
  • Page 18 Getting Started NOTE. If the VXOA41 is installed in a D-size mainframe, ensure that the front-panel gap is properly sealed to maintain adequate internal air flow for cooling. 4. Ensure the module is fully seated into its VXI connectors and that the front panel of the module is flush with the front of the mainframe chassis.

  • Page 19: Checkout Procedure

    VXOA41 using standard talker/listener hardware or software or other program development environments. There are basically two steps that you should perform to verify that the VXOA41 is correctly installed and operating on the VXI bus. 1. Verify that the READY LED is lighted approximately five seconds after you power on the mainframe;...

  • Page 20: Operating Basics

    Operating Basics...

  • Page 22: Operating Basics

    If the diagnostics fail, the READY LED will not light. The ACCESSED LED is an amber LED that briefly lights each time commu- nications to the VXOA41 occur. It also lights while the MODID is asserted by the VXI Slot 0 module. This feature supports physical identification of modules within the mainframe.
  • Page 23 Operating Basics Figure 2-1: VXOA41 Front Panel (Option 1 Shown) 2–2 VXOA41 Optical Attenuator User Manual...
  • Page 24 Reference...

  • Page 26: Command Syntax

    Command Syntax You can control the VXOA41 using a large group of commands and queries. This section describes the syntax these commands and queries use and the conventions the VXOA41 uses to process them. The commands and queries themselves are listed in the section entitled Commands.
  • Page 27 Header Mnemonics Argument Figure 3-1: Command Message Elements Commands Commands cause the VXOA41 to perform a specific function or change one of its settings. Commands have the following structure: 3–2 VXOA41 Optical Attenuator User Manual...

  • Page 28: Command Entry

    Headers in Query You can control whether or not headers are returned by the VXOA41 as part of Responses the query response. Use the command to control this feature. If is on, command headers are returned as part of the query, and the query response is formatted as a valid set command.
  • Page 29 Command Syntax Abbreviating Commands You can abbreviate many VXOA41 commands. These abbreviations are shown in capitals in the command’s listing in the Commands section. For example, the command DISPlay can be entered simply as DISP or display. If you use the HEADER command to have command headers included as part of query responses, you can further control whether the returned headers are abbreviated or are full-length.

  • Page 30: Argument Types

    The argument of a command can take several forms. The individual descriptions of each command tell which argument types to use with that command. Block Arguments One VXOA41 command utilizes a block argument form. The elements of the block arguments described in Table 3–4. Table 3–4: Block Argument Elements...
  • Page 31 If this form is used, the last byte of the block must have EOI asserted. Conse- quently, this must be the last or only command. Although the VXOA41 accepts this format, it will never respond to a query with this format.

  • Page 32: Syntax Diagrams

    A path around a group of elements shows that those elements are optional. Loops show elements that can be repeated. Figure 3-3 shows the structure of a few typical syntax diagrams. Figure 3-3: Typical Syntax Diagrams 3–7 VXOA41 Optical Attenuator User Manual...
  • Page 33 Command Syntax 3–8 VXOA41 Optical Attenuator User Manual...

  • Page 34: Common Commands And Queries

    . The examples in this manual use the abbreviated forms. Common Commands and Queries Several commands and queries used with the VXOA41 are common to all devices that support IEEE 488.2. These commands and queries are defined by IEEE Std 488.2-1987.
  • Page 35 Number of Events in Queue Set to Factory Defaults Header Identification Learn Device Setup Operation Complete Option Identification Query Power-On Status Clear Reset Service Request Enable Read Status Byte Self-Test Verbose Wait To Continue *CAL? always returns 0. 3–10 VXOA41 Optical Attenuator User Manual...

  • Page 36: Device Commands And Queries

    Device Commands and Queries Table 3–7 lists the device commands, queries, and command parameters that are specific to the VXOA41. Complete descriptions of these commands appear in the alphabetical listing of commands that immediately follows this table. Table 3–7: VXOA41 Device Commands and Parameters...
  • Page 37 The event code and message in the following format: is the command that caused the error and it might be returned when a command error is detected by the VXOA41. As much of the command will be returned as possible without exceeding the 60 character limit of the strings combined.
  • Page 38 If you make a query without an argument (for example, ATTen?), the response is the same as that for an ATTen:DB?; DBR? query. Examples Would return the string : Would return the string: Would return the string: 3–13 VXOA41 Optical Attenuator User Manual...

  • Page 39: Attenuation:increment

    ATTenuation:INCRement sets and queries the increment value used in the triggered auto-increment mode. Each time a trigger occurs (a trigger word serial command or the ATT:NEXT command) the VXOA41 changes the current attenuation setting by the set increment value. The increment value may be either positive or negative.

  • Page 40: Attenuation:trigger

    . Note that there is no space between TTLTRG and the numeric argument. Examples Specifies that the line TTLTRG1 will be used to monitor attenuator adjusting status. Disables the TTL trigger line usage. Might return the string: 3–15 VXOA41 Optical Attenuator User Manual...

  • Page 41: Attenuation:tpolarity

    Might return the string: BLRN The query version of this command reads the instrument configuration in binary form. The command version configures the instrument binary data format. The configuration is 22 bytes long. Related Commands *LRN Syntax 3–16 VXOA41 Optical Attenuator User Manual...
  • Page 42 This command also puts the VXOA41 in the Operation Complete Command Idle State and in the Operation Complete Query Idle State. While in these states, the VXOA41 has nothing in its buffers and does not execute commands or queries. Related Commands...
  • Page 43 Event Queue and summarized on the ESB bit (bit 5) of the Status Byte Register. Use the command to set the ESER. A complete discussion of event handling is on page 3–35. 3–18 VXOA41 Optical Attenuator User Manual...
  • Page 44 The *ESE (Event Status Enable) command sets and queries the bits in the Event Status Enable Register (ESER). The ESER prevents events from being reported to the Status Byte Register (STB). For a complete discussion of the use of these registers, see page 3–35. 3–19 VXOA41 Optical Attenuator User Manual...
  • Page 45 Event Status Register (SESR). *ESR? also clears the SESR (since reading the SESR clears it). For a complete discussion of the use of these registers, see page 3–35. Related Commands ALLev?, *CLS, DESE, *ESE, EVENT?, EVMSG?, EVQTy?, *SRE, *STB Syntax 3–20 VXOA41 Optical Attenuator User Manual...
  • Page 46 *ESR? read and returns the event code along with an explanatory message. A complete discussion of event handling is on page 3–35. Related Commands *CLS, DESE, *ESE, *ESR?, EVENT?, *SRE, *STB Syntax 3–21 VXOA41 Optical Attenuator User Manual...
  • Page 47 , showing that there are four events in the event queue. FACTory (No Query Form) The FACTory command resets the VXOA41 to its factory default settings and purges stored settings. NOTE. The FACTory command can take 5 to 10 seconds to complete depending on attenuation settings.
  • Page 48 Commands The FACTory command does the following: Puts the VXOA41 in the Operation Complete Command Idle State. Puts the VXOA41 in the Operation Complete Query Idle State. Clears the Event Status Enable Register (equivalent to the command Clears the Service Request Enable Register (equivalent to the command...
  • Page 49 VXOA41 to include headers on applicable query responses. You can then use the query response as a command. = 0 sets the Response Header Enable State to FALSE. This causes the VXOA41 to omit headers on query responses, so that only the argument is returned. Examples Causes the VXOA41 to omit headers from query responses.

  • Page 50: Lrn? Or Set

    HEADER command. This is because the returned string is intended to be able to be sent back to the VXOA41 as a command string. The VERBOSE command can still be used to specify whether the returned headers should be abbreviated or full length.

  • Page 51: Opc

    Syntax Returns The command returns a single “ ” if the VXOA41 is in standard configuration (no options, single-mode fiber). If options are installed, the command returns a string of three fields, with each field separated by a comma. Each of the fields represents one of the possible options.

  • Page 52: Psc

    –32767 to 32767. = 0 sets the power-on status clear flag to FALSE, disables the power-on clear and allows the VXOA41 to assert SRQ after power-on. 0 sets the power-on status clear flag TRUE. Sending *PSC 1 therefore enables the power-on clear and prevents any SRQ assertion after power-on.

  • Page 53: Reference

    99.99. Examples Sets the REFerence value to 45.00 dB. Would return the string: :REF 45.00 *RST (No Query Form) The *RST (Reset) command returns the VXOA41 to a known set of instrument settings. 3–28 VXOA41 Optical Attenuator User Manual...

  • Page 54: Sre

    *PSC, FACTory Syntax *RST does the following: Puts the VXOA41 into the Operation Complete Command Idle State. Puts the VXOA41 into the Operation Complete Query Idle State. Returns the instrument settings to those listed on page 3–23. The *RST command does not alter the following: The state of the IEEE Std 488.2 interface.

  • Page 55: Stb? (Query Only)

    3–35. Related Commands ALLev?, *CLS, DESE, *ESE, *ESR, EVENT?, EVMSG?, EVQty?, *SRE Syntax Examples Might return the value , showing that the STB contains the binary value 01100000. 3–30 VXOA41 Optical Attenuator User Manual...

  • Page 56: Store

    The self-test does not require operator interaction and does not create bus conditions that violate IEEE Std 488.1/488.2 standards. When complete, the VXOA41 returns to the state it was in just prior to the self-test. The test response is a value as described in Table 3–9.

  • Page 57: Verbose

    The VERBOSE command sets and queries the Verbose Header State that controls the length of headers on query responses. This command does not affect IEEE Std 488.2 Common Commands (those starting with an asterisk). Related Commands HEADER, *LRN? 3–32 VXOA41 Optical Attenuator User Manual...

  • Page 58: Wai (No Query Form)

    Sets the Verbose Header State TRUE. Might return the value , showing that the Verbose Header State is TRUE. *WAI (No Query Form) The *WAI (Wait) command prevents the VXOA41 from executing further commands or queries until all pending operations finish. Related Commands...
  • Page 59 1E–06) accepted as multipliers; M (for meters) is also an acceptable term (see examples below). Examples Returns the value of wavelength to which the VXOA41 is set. An example response is: Sets the wavelength to 1300 nm. Sets the wavelength to 1300 nm.

  • Page 60: Status And Events

    The Standard Event Status Register (SESR) and the Status Byte Register (SBR) record certain types of events that may occur while the VXOA41 is in use. These registers are defined by IEEE Std 488.2. Refer also to Figure 3-4 and Table 3–10.
  • Page 61 Table 3–13, on page 3–41, lists Command error messages. EXE (Execution Error). Shows that an error occurred while the VXOA41 was executing a command or query. Table 3–14, on page 3–42, lists Execution error messages.
  • Page 62 Queue. 3–0 Not used (always 0). When the user has enabled a VME interrupt for the VXOA41, this bit is the indicator of whether the VME interrupt has been asserted. Enable Registers The DESER, ESER, and SRER allow you to select which events are reported to the Status Registers and the Event Queue.
  • Page 63 *PSC 0, use the DESe and *ESE commands to enable PON in the DESER and ESER, and use the *SRE command to enable bit 5 in the SRER. Subsequent power-on cycles will generate a Service Request. 3–38 VXOA41 Optical Attenuator User Manual...

  • Page 64: Queues

    Status and Events Queues The VXOA41 status and event reporting system contains two queues: the Output Queue and the Event Queue. The Output Queue The Output Queue stores up to 8000 bytes of a query response while it is waiting to be output.

  • Page 65: Conflicts

    To avoid generating this event, concatenate commands so that the conflict is resolved when the command is completed. For example, when setting the attenuator in DBR mode, always make sure that the REF command precedes the ATT:DBR command,otherwise an execution warning will result. 3–40 VXOA41 Optical Attenuator User Manual...

  • Page 66: Messages

    Tables 3–12 through 3–17 list all the programming interface messages the VXOA41 generates in response to commands and queries. For most messages, a secondary message from the VXOA41 gives more detail about the cause of the error or the meaning of the message. This message is part of the message string and is separated from the main message by a semicolon.
  • Page 67 Block data not allowed Table 3–14 lists the execution errors that are detected during execution of a command. Table 3–14: Execution Error Messages EXE Bit 4 — Code Message Execution error Parameter Error Settings in conflict 3–42 VXOA41 Optical Attenuator User Manual...
  • Page 68 Message Data out of range Too much data Table 3–15 lists the device errors that can occur during operation of the VXOA41. These errors may indicate that the VXOA41 needs repair. Table 3–15: Device Error Messages DDE Bit 3 —...
  • Page 69 Table 3–17 lists warning messages that do not interrupt the flow of command execution. These notify you that you might get unexpected results. Table 3–17: Execution Warning Messages EXE Bit 4 — Code Message Execution warning 3–44 VXOA41 Optical Attenuator User Manual...

  • Page 70: Appendices

    Appendices...

  • Page 72: Appendix A: Accessories And Options

    Appendix A: Accessories and Options The following paragraphs describe the standard and optional accessories for the VXOA41 Optical Attenuator. To purchase optional accessories, or purchase additional standard accessories, see a Tektronix products catalog or contact your local Tektronix field representative. Standard Accessories The VXOA41 Optical Attenuator User Manual (Tektronix part number 070-8777-00) is this manual.

  • Page 73: Options

    Appendix A: Accessories and Options Diamond 2.5 to SMA, Tektronix part number 174-1303-00. Optical Connector Kit Universal optical input and output connector kit, Tektronix part number 020-1885-00. NOTE. Each connector kit contains only one connector. To change both optical connectors on the VXOA41 you must purchase two kits.

  • Page 74: Appendix B: Specifications

    The instrument must have had a warm-up period of at least 20 minutes. All optical connections to the instrument are made using physical contact connectors. Tektronix offers a limited selection of fiber optic jumper cables which utilize physical contact on the connector ends (for example, Tektronix part number 174-1387-00;...
  • Page 75 95% RH: 11 C to 30 C (52 F to 86 F) Nonoperating 75% RH: 11 C to 40 C (52 F to 104 F) 45% RH: 11 C to 50 C (52 F to 122 F) (Exceeds MIL-T-28800D, Class 5, noncondensing) B–2 VXOA41 Optical Attenuator User Manual...
  • Page 76 RF Electromagnetic Field Immunity IEC 801-4 Electrical Fast Transient/Burst Immunity IEC 801-5 Power Line Surge Immunity FCC Compliance Emissions comply with FCC Code of Federal Regulations 47, Part 15, Subpart B, Class A Limits B–3 VXOA41 Optical Attenuator User Manual...
  • Page 77 Appendix B: Specifications B–4 VXOA41 Optical Attenuator User Manual...

  • Page 78: Appendix C: Interface Specifications

    Appendix C: Interface Specifications Interface Standard The VXOA41 conforms to the VXIbus Specification Version 1.3 as a message- based I4 device. All instrument commands comply with the IEEE 488.2 standard. No commander capability No Signal Register No VMEbus master capability...

  • Page 79: Character Set (Ascii Chart)

    Appendix C: Interface Specifications Character Set (ASCII Chart) Table C–1 shows the character set used for all messages to and from the VXOA41. This is identical to standard ASCII. Table C–1: The ASCII Character Set C–2 VXOA41 Optical Attenuator User Manual...

  • Page 80: Vxi Word Serial Commands

    Appendix C: Interface Specifications VXI Word Serial Commands The VXOA41 recognizes the following VXI word serial commands. These commands are described in the VXIbus Specification Version 1.3. Each word serial command is a 16-bit word that the Slot 0 controller sends to the instrument via its data low register.
  • Page 81 NORMAL OPERATION substate. Read Interrupter Line Returns the currently assigned VME interrupter line. Read Interrupters Returns the number of interrupters supported. The VXOA41 supports only one interrupter. Read Protocol Returns the capabilities of the instrument to the Commander. This word always has the value 0xFE23.

  • Page 82: Appendix D: Using The *Opc Query/Command

    Below is an example that illustrates the use of instrument commands and queries utilizing the *OPC? query/command. In this example, queries to other instru- ments (such as the power meter) are not made until all of the VXOA41’s pending operations have completed.
  • Page 83 Appendix D: Using the *OPC Query/Command D–2 VXOA41 Optical Attenuator User Manual...

  • Page 84: Appendix E: Packing For Shipment

    15 cm (6 in) taller, wider, and deeper than the VXOA41. The shipping carton must be constructed of cardboard with 375 pound test strength. 2. If you are shipping the VXOA41 to a Tektronix field office for repair, attach a tag to the VXOA41 showing the instrument owner and address, the name of the person to contact about the instrument, the instrument type, and the serial number.
  • Page 85 Appendix E: Packing for Shipment E–2 VXOA41 Optical Attenuator User Manual...

  • Page 86: Appendix F: Maintenance

    Clean the fiber connector with a clean cloth. To clean an optical port, perform the following steps: 1. Turn the power supply off and then pull the VXOA41 out of the mainframe. 2. Use a Phillips screwdriver to remove the four screws that secure the bulkhead connector to the front panel (see Figure F-1).

  • Page 87: Changing The Optical Port Connectors

    If you wish to change to the ST, DIN 47256, or SC connectors perform the following procedure. 1. Turn the power supply off first and then pull the VXOA41 out of the mainframe. 2. Using a Phillips screwdriver, remove the four screws that secure the bulkhead connector to the front panel (see Figure F-1).
  • Page 88 Reinstall the side cover when finished. 4. Disassemble the bulkhead as shown in Figures F-2 through F-5. Figure F-2: FC Optical Bulkhead Assembly F–3 VXOA41 Optical Attenuator User Manual...
  • Page 89 Appendix F: Maintenance Figure F-3: ST Optical Bulkhead Assembly Figure F-4: DIN 47256 Optical Bulkhead Assembly F–4 VXOA41 Optical Attenuator User Manual...
  • Page 90 Appendix F: Maintenance Figure F-5: SC Optical Bulkhead Assembly 5. Replace the current bulkhead with the one you wish to use and re-assemble. 6. Installation is the reverse of steps 1 through 3. F–5 VXOA41 Optical Attenuator User Manual...
  • Page 91 Appendix F: Maintenance F–6 VXOA41 Optical Attenuator User Manual...

  • Page 92: Appendix G: Performance Verification

    “...the query response...” refer to using this utility to send and receive the IEEE 488.2 message-based command/queries to the VXOA41. The actual text in this procedure that is sent to or received from the VXOA41 appears in a different typeface, for example, Averaging Optical Power Meter with the following requirements: 0.01 dB resolution...
  • Page 93 For a VXOA41 option 1: One 50 µm core multimode fiber from source to input of the VXOA41 option 1 and one 50 µm core or greater for output of VXOA41 option 1 to the Optical Power Meter (note: 62.5 µm is largest fiber core allowed for accurate use with the Tektronix OCP Power Meter).

  • Page 94: Power Up

    Appendix G: Performance Verification NOTE. The equipment listed is sufficient to carry out the Performance Verifica- tion. However, the VXOA41 is an instrument capable of operating at over a thousand different wavelength settings and at over 6000 different attenuation level settings. This verification procedure is not intended as a comprehensive verification of the instrument’s specifications.
  • Page 95 The DISABLE red LED should be lighted. 7. Send the command ; this will withdraw the shutter so that it is no longer blocking the optical path. The DISABLE red LED should be off (unlighted). G–4 VXOA41 Optical Attenuator User Manual...

  • Page 96: Shutter Attenuation And Disable

    4. Send the command , this withdraws the shutter from the optical path. 5. Connect a fiber of equal or greater core diameter than VXOA41 to the output of the VXOA41. G–5 VXOA41 Optical Attenuator User Manual...
  • Page 97 The Relative Attenuation should be >100 dB lower; that is, the power meter in relative mode should read less than –100 dB (note: for the VXOA41 option 3, the relative level should be >90 dB lower). NOTE. Most Optical Power Meters cannot accurately measure at such low power levels;...

  • Page 98: Insertion Loss (Long Wavelengths)

    1 W of optical power into the fiber jumper used. The source must emit light at a wavelength within the specifica- tions of the VXOA41 long wavelength insertion loss (1100 nm to 1700 nm). 5. Record the power reading from the Optical Power Meter as Plong1.
  • Page 99 6. If you have not already done so, attach the optical source to the input of the VXOA41 using the fiber jumper. 7. Attach the output of the VXOA41 to the Optical Power Meter using a fiber of greater than or equal core diameter compared to the VXOA41.

  • Page 100: Insertion Loss (Short Wavelengths)

    2. Connect an optical source to the input of the Average Optical Power Meter using an optical fiber jumper cable of equal or lesser core diameter than the VXOA41 (see page B–1 for the core diameter of the particular VXOA41 under test).
  • Page 101 Output Figure G-5: Second setup for Insertion Loss Procedure 5. Attach the optical source to the input of the VXOA41 using the fiber jumper. 6. Attach the output of the VXOA41 to the Optical Power Meter using a fiber of greater than or equal core diameter compared to the VXOA41.

  • Page 102: Repeatability And Accuracy

    Output Figure G-6: Setup for Repeatability and Accuracy Procedure 1. Attach the stable source to the input of the VXOA41 and attach the output of the VXOA41 to the Optical Power Meter using the appropriate fiber optic jumper cables. Be sure that the attenuator wavelength setting matches the source wavelength;...
  • Page 103 (in this example, 2. Set the VXOA41 to minimum attenuation by sending the command 3. After the attenuator is stable, record the optical power measured by the Optical Power Meter; set this power level as the 0 dB reference level of the Power Meter.
  • Page 104 (<0.005 dB change) and the fiber jumper cables have not been disturbed. This completes the performance verification. NOTE. To fully verify the accuracy of the VXOA41, you should repeat steps 1 through 10 for each of the three wavelengths described in the opening paragraph of this procedure.
  • Page 105 Appendix G: Performance Verification G–14 VXOA41 Optical Attenuator User Manual...

  • Page 106: Appendix H: Replaceable Parts

    Appendix H: Replaceable Parts This appendix contains a list of the components that are replaceable for the VXOA41 Optical Attenuator. As described below, use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available from or through your local Tektronix service center or representative.
  • Page 107 SCHROFF INC 170 COMMERCE DR WARWICK RI 02886–2430 73743 FISCHER SPECIAL MFG CO 111 INDUSTRIAL RD COLD SPRING KY 41076–9749 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR BEAVERTON OR 97077–0001 PO BOX 500 H–2 VXOA41 Optical Attenuator User Manual...
  • Page 108 426248900 –4 211–0101–00 SCREW,MACHINE:4–40 X 0.25,FLH,100 DEG,STL TK0435 ORDER BY DESC –5 200–4043–00 COVER,SIDE:VXI C–SIZE,0.032 ALIM 5052 80009 200404300 –6 334–8657–00 MARKER,IDENT:MKD TEKTRONIX VXOA41 OPT ATTEN 80009 334865700 –7 210–0405–00 NUT,PLAIN,HEX:2–56 X 0.188,BRS 73743 12157–50 –8 367–0448–00 HANDLE,CARRYING:GEMINI 62559 20808–004 –9...
  • Page 109 Appendix H: Replaceable Parts Figure H-1: VXOA41 Replaceable Parts H–4 VXOA41 Optical Attenuator User Manual...

  • Page 110: Glossary And Index

    Glossary and Index...
  • Page 112 Singlemode Fiber An optical fiber with a narrow core that supports the transmission of only one mode of light through the fiber. Glossary–1 VXOA41 Optical Attenuator User Manual...
  • Page 113 Glossary Glossary–2 VXOA41 Optical Attenuator User Manual...
  • Page 114 *SRE, 3–29–3–30, 3–38 removing panels or covers, vi *STB?, 3–30, 3–36 checkout procedure, ID?, *IDN? query, 1–6 STOre, 3–31 Cladding, Glossary–1 Syntax, BNF (Backus-Naur form), 3–1 Clear Status, 3–17–3–18 Table *CLS command, 3–17–3–18 Command *CAL?, 3–17 Index–1 VXOA41 Optical Attenuator User Manual...
  • Page 115 Event query, 3–21–3–22 module installation, 1–3–1–5 Event queue, 3–21–3–22, 3–39 Multi-mode Fiber, Glossary–1 EVENt? command, 3–21 EVMSg? command, 3–21–3–22 EVQty? command, 3–22 Numeric, Command argument, 3–6 Numerical Aperature, Glossary–1 FACTory command, 3–22–3–23 front-panel, description, 2–1–2–2 Index–2 VXOA41 Optical Attenuator User Manual...
  • Page 116 Begin Normal Operation, C–3 Self test, 3–31–3–32 Byte Available, C–3 Separator, Command, 3–2 Byte Request, C–3 Serial poll, 3–36 Clear, C–3 Service request enable command, 3–29–3–30 Clear Lock, C–3 Service request enable register, 3–29–3–30 Index–3 VXOA41 Optical Attenuator User Manual...
  • Page 117 Index Control Event, C–4 End Normal Operation, C–4 Read Interrupter Line, C–4 Read Interrupters, C–4 Read Protocol, C–4 Read Protocol Error, C–4 Read STB, C–4 Set Lock, C–4 Trigger, C–4 word serial protocol, 1–1 Index–4 VXOA41 Optical Attenuator User Manual...

Table of Contents