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Tektronix VXOA41 Manual

1. Characteristics Specification Wavelength Range 600 nm 1700 nm Input Standard Singlemode Fiber Option 1 50 um Multimode Fiber Option 2 62 5 um Multimode Fiber Option 3 100 Multimode Fiber Insertion Loss 1100 1700 nm lt 2 0 dB 700 1100 nm lt 4 0 dB Return Loss lt 45 dB Option 1 lt 25 dB Option 2 lt 25 dB Option 3 lt 25 dB Attenuation Range 600 1350 nm 2 60 dB calibrated 0 01 dB step size 1350 1600 nm gt 50 dB calibrated 0 01 dB step size VXOAA Optical Attenuator User Manual B 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix B Specifications Table B 1 Optical Characteristics Cont Characteristics Maximum Attenuation Specification 2 100 dB shutter activated Option 1 2 100 dB shutter activated Option 2 Option 3 Repeatability Linearity 2 100 dB shutter activated gt 90 dB shutter activated 0 05 dB 0 05 dB Accuracy 850 20 nm 1300 20 nm 1500 20 nm lt 0 15 dB typically 0 05 dB lt 0 15 dB typically 0 05 dB lt 0 15 dB typically 0 05 dB Table B 2 Physical Characteristics Characteristics Net Weight External Dimensions Height Width Specification 2 4 kg 5 25 Ib 60 66 mm 2 39 in 366 70 mm 14 38 in Length 345 03 mm 13 58 in Table 3 Environmental Performance Characteristic Temperature Operating Spe
2. NOTE The FACTory command can take 5 to 10 seconds to complete depending on attenuation settings DESE ESE HEADER PSC RST SRE VERBOSE FACTory FACTory VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands The FACTory command does the following Puts the VXOAALT in the Operation Complete Command Idle State m Puts the VXOAALT in the Operation Complete Query Idle State m Clears the Event Status Enable Register equivalent to the command ESE 0 m Clears the Service Request Enable Register equivalent to the command SRE 0 W Sets the Device Event Status Enable Register to all enabled equivalent to the command DESE 255 W Sets the Power on status clear flag to TRUE equivalent to the command PSC 1 W Sets the Response Header Enable State to TRUE equivalent to the command HEADER 1 W Sets the Verbose Header State to TRUE equivalent to the command VERBOSE 1 m Sets the certain parameters as shown in Table 3 8 Table 3 8 FACTory Default Settings Parameter ATT DB REF STORE1 STORE2 DISABLE WAVELENGTH The FACTory command does not alter the following items m The state of the VXI interface m The selected VXI address m Calibration data that affects device specifications VXOAAI Optical Attenuator User Manual 3 23 Artisan Technology Group Quality Instrumentation
3. 4 rtisan tisan Technology Group is your source for quality Femoog Ge new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment EQUIPMENT DEMOS HUNDREDS OF InstraV ea REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com Z information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED Contact us 888 88 SOURCE sales artisantg com www artisantg com User Manual Tektronix VXOAAI Optical Attenuator 070 8777 01 C Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Copyright Tektronix Inc 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 Wil
4. Commands Table 3 6 Commands Common to All GPIB Devices and Supported by the VXOA41 Header Full Command Name ALLev All Events BLRN Binary Device Setup CAL Instrument S elf Calibration CLS Clear Status DESE Device Event Status Enable ESE Standard Event Status Enable ESR Standard Event Status Register EVENT Event EVMSG Event Message EVQTy Number of Events in Queue FACTory Setto Factory Defaults HEADer Header IDN Identification LRN Learn Device Setup OPC Operation Complete OPT Option Identification Query PSC Power On Status Clear RST Reset SRE Service Request Enable STB Read Status Byte TST Self Test VERBOSE Verbose WAI Wait To Continue CAL always returns 0 Artisan Technology Group Quality Instrumentation VXOAA Optical Attenuator User Manual Guaranteed 888 88 SOURCE www artisantg com Commands 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 Header Full Command Name ADJusting Attenuator Adjusting ATTenuation Attenuation ATTenuation DB Attenuation in Absolute Terms ATTenuation DBR Attenuation with Reference Value ATTenuation MIN Minimum Attenuation ATT
5. Reading an event removes it from the queue Before reading an event from the Event Queue you must use the ESR query to read the summary of that event from the SESR Sending an ESR query makes the events summarized by the ESR read available to the EVENT and EVMSG queries and empties the SESR Reading the SESR erases any events that were summarized by a previous ESR read but not read from the Event Queue Events that follow an ESR read are put in the Event Queue but are not available until ESR is used again Event Handling Sequence Figure 3 9 on page 3 40 shows how to use the status and event handling system In the explanation that follows numbers in parentheses refer to numbers in Figure 3 9 When an event occurs a signal is sent to the DESER 1 If that type of event is enabled in the DESER that is if the bit for that event type is set to 1 the appropriate bit in the SESR is set to one and the event is recorded in the Event Queue 2 If the corresponding bit in the ESER is also enabled 3 then the ESB bit in the SBR is set to one 4 When output is sent to the Output Queue the MAV bit in the SBR is set to one 5 When a bit in the SBR is set to one and the corresponding bit in the SRER is enabled 6 the MSS bit in the SBR is set to one and a service request is generated 7 VXOAAI Optical Attenuator User Manual 3 39 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE
6. STB STB Might return the value 96 showing that the STB contains the binary value 01100000 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands STORe Related Commands Syntax Arguments Examples TST Query Only Related Commands The STORe command Store Attenuation sets or reads the value of stored positions 1 or 2 Using the command form for example STOR1 without a value specified stores the current attenuation in the specified location RECall STORe 1 2 STORe 1 2 STORe 1 2 NRf lt 5 gt lt NRf gt specifies the attenuation value to be stored The range for the attenuation value is 0 lt NRf x 60 00 attenuation values associated with the STORe command and query forms are in absolute dB and never include the REF ERENCE value even if the front panel display shows that the VXOA41 is set to ATT REF mode STORE1 Returns the attenuation value stored in register 1 in the form 5 0 1 lt NRf gt STORE1 20 00 Sets the attenuation value in stored register 1 to 20 00 dB STORE2 Stores the current attenuation value in stored register 2 The TST Self Test query runs the VXOA41 internal self test and reports the results The self test does not require operator interaction and does not create bus conditions that violate IEEE Std 488 1 488
7. www artisantg com Status and Events 7 6 5 4 3 2 1 0 x Standard Event Status Register SESR Event Queue 1 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE OPC T 7 6 5 4 3 2 1 0 Queue S Status Byte Register SBR Service Request Enable Register SRER Figure 3 9 Status and Event Handling Process Conflicts Whenever a command is issued that results in a conflict an event is generated on the EXE bit bit 4 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 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events 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 Each message is the result of an event Each type of event sets a specific bit in the SESR and is controlled by the equivalent bit
8. Guaranteed 888 88 SOURCE www artisantg com Commands HEADer Related Commands Syntax Arguments Examples IDN Query Only 3 24 The HEADer command sets and queries the Response Header Enable State that causes the VXOAAI to either include or omit headers on query responses This command does not affect IEEE Std 488 2 Common Commands those starting with an asterisk or the LRN response VERBOSE HEADer ON OFF NRf HEADer ON or lt NRf gt 0 sets the Response Header Enable State to TRUE This causes the VXOAAT to include headers on applicable query responses You can then use the query response as a command OFF or lt NRf gt 0 sets the Response Header Enable State to FALSE This causes the VXOA41I to omit headers on query responses so that only the argument is returned HEADER OFF Causes the VXOA41 to omit headers from query responses HEADER 1 Causes the VXOA41 to include headers on applicable query responses HEADER Might return the value 1 showing that the Response Header Enable State is TRUE The IDN Identification query returns the VXOAAT s unique identification code VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax Examples LRN or SET Related Commands IDN CTO The query response is an ASCII string separated into four fields by
9. lists Execution error messages 3 DDE Device Error Shows thata device error occurred Table 3 15 on page 3 43 lists Device error messages 2 QYE Query Error Shows that either an attempt was made to read the Output Queue when no data was present or pending or that data in the Output Queue was lost 1 RQC Request Control Not used 0 LSB OPC Operation Complete Shows that the operation is complete The OPC command sets this bit The Status Byte Register SBR The SBR shown in Figure 3 5 records whether output is available in the Output Queue whether the VXOA41 requests service and whether the SESR has recorded any events Use a Read STB word serial command or the STB query to read the contents of the SBR Refer to Table 3 11 The bits in the SBR are set and cleared depending on the contents of the SESR the Event Status Enable Register ESER and the Output Queue When you use the Read STB word serial command to obtain the SBR bit 6 is the RQS bit When you use the STB query to obtain the SBR bit 6 is the MSS bit Figure 3 5 The Status Byte Register SBR 3 36 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events Table 3 11 SBR Bit Functions Bit Function 7 MSB Not used always 0 6 RGS Request Service obtained from a Read STB word serial command Show
10. 16 System Event Messages QYE Bit 2 Code Message 401 Power on PON Bit7 402 Operation complete OPC Bit 0 403 User request Bit 6 410 Query interrupted 420 Query unterminated 430 Query deadlocked 440 Query unterminated after indefinite response VXOAAI Optical Attenuator User Manual 3 43 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events 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 Message 500 Execution warning 3 44 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendices Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com aww rr sss 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 m The VXOA41 Optical Attenuator User Manual Tektronix par
11. 2 standards When complete the VXOAALT returns to the state it was in just prior to the self test The test response is a value lt NR1 gt as described in Table 3 9 N A VXOAAI Optical Attenuator User Manual 3 31 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax Examples VERBOSE Related Commands 3 32 NOTE If an error is detected TST stops and returns an error code and does not complete any remaining tests It also places a device dependent event in the event queue TST Cre NOTE The TST query can take 5 seconds or more to respond Table 3 9 Results from TST lt NR1 gt Meaning 0 Test completed with no errors detected 101 102 ROM checksum error 104 Non volatile RAM is bad 115 System timer is bad 401 Calibration EEPROM is bad 410 411 Calibration needed TST Might return the value 115 indicating that the system timer is not working correctly 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 HEADER LRN VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax Arguments Examples WAI No Query Form Related Co
12. 3 9 Figure F 1 Figure F 2 Figure F 3 Figure F 4 Figure F 5 Figure G 1 Figure G 2 Figure G 3 Figure G 4 Figure G 5 Figure G 6 Figure H 1 VXOAA Optical Attenuator User Manual Logical Address Switch location on the VXOA41 1 4 Removing the VXOA41 from the Mainframe 1 5 VXOAAI Front Panel Option 1 Shown 2 2 Command Message 3 2 Block Argument 3 6 Typical Syntax Diagrams 3 7 The Standard Event Status Register SESR 3 36 The Status Byte Register SBR 3 36 The Device Event Status Enable Register DESER 3 37 The Event Status Enable Register ESER 3 38 The Service Request Enable Register SRER 3 38 Status and Event Handling Process 3 40 Removing the Optical Bulkhead Connector 2 FC Optical Bulkhead Assembly 3 ST Optical Bulkhead Assembly F 4 DIN 47256 Optical Bulkhead Assembly F 4 SC Optical Bulkhead Assembly F 5 Setup for Shutter Attenuation and Disable Procedure G 5 First setup for Insertion Loss Procedure G 7 Second setup for Insertion Loss Procedure G 8 First setup for Insertion Loss Procedure G 9 Second setup for Insertion Loss Procedure G 10 Setup for Re
13. Attenuator User Manual Artisan Technology Group Quality Instrumentation OPT 3 26 SET 3 25 Abbreviating 3 4 ADJusting 3 11 3 12 ALLev 3 12 Argument 3 2 ATTenuation 3 13 ATTenuation INCRement 3 14 ATTenuation NEXT 3 14 3 15 ATTenuation TPOLarity 3 16 ATTenuation TRIGger 3 15 Block argument 3 5 BLRN 3 16 3 17 CLS 3 17 3 18 Common List 3 9 Concatenating 3 4 DESE 3 18 3 19 3 37 Device List 3 11 DISable 3 19 ESE 3 19 3 20 3 38 ESR 3 20 3 21 3 35 EVENt 3 21 EVMSg 3 21 3 22 EVQty 3 22 FACTory 3 22 3 23 HEADER 3 24 Header 3 2 IDN 3 24 3 25 List Common command 3 9 Device command 3 11 LRN 3 25 Message 3 2 Mnemonic 3 2 Numeric argument 3 6 OPC 3 26 PSC 3 27 3 38 Query 3 1 3 3 RECall 3 27 3 28 REFerence 3 28 RST 3 28 3 29 Separator 3 2 Set 3 1 3 2 SRE 3 29 3 30 3 38 STB 3 30 3 36 5 3 31 Syntax BNF Backus Naur form 3 1 Table Common command 3 9 Device command 3 11 Index 1 Guaranteed 888 88 SOURCE www artisantg com Index TST 3 31 3 32 VERBOSE 3 32 3 33 WAJI 3 33 WaAVelength 3 33 Word Serial 3 Command syntax BNF Backus Naur form 3 1 Common command List 3 9 Concatenating Command 3 4 Configuration Command query 3 24 3 25 Conflicts 3 40 cooling requirements 1 2 Core Glossary 1 D DANGER statement on equipment v dBm Glossary 1 DESE command 3 18 3
14. Index Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com was Glossary Buffer A protective coating placed on an optical fiber Dispersion The process by which an optical signal is distorted as it travels through an optical fiber One kind of dispersion is material dispersion which is caused by a differential delay of the different wavelength components of an optical signal Cladding The outer layer of an optical fiber which surrounds the core and has a lower refractive index than the core Core The center light guiding section of an optical fiber dBm An expression of power level in decibels referenced to a power of one milliwatt Mode An allowable electromagnetic field pattern within an optical fiber An allowable pattern satisfies Maxwell s equations Multimode Fiber An optical fiber with a core that is larger enough to support the transmission of more than one mode of light through the fiber that is axial and non axial light rays Numerical Aperature A measure of the light gathering ability of an optical fiber which describes the maximum angle to the fiber axis at which light will be accepted and propagated The numerical aperature of an optical fiber is defined as NA gt n2 where n and n are the refractive index of the core and the cladd
15. Meter using the appropriate fiber optic jumper cables Be sure that the attenuator wavelength setting matches the source wavelength this can be accomplished by sending the command VXOAAI Optical Attenuator User Manual G 11 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification 10 WAVE wavelength where lt wavelength gt is a number matching the wavelength of the stable source in units of nanometers For example you might send the command WAVE 1300 You can check the wavelength setting by sending the query WAVE and noting the response in this example WAVELENGTH 1300 Set the VXOA41 to minimum attenuation by sending the command ATT MIN 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 Set the Optical Power Meter to display in dB Adjust the attenuation to 10 00 dB by sending the command ATT DB 10 to the VXOAAI Record the relative dB power level of the Power Meter this value should be 10 00 dB 0 15 dB relative to the previously set 0 dB reference level when the VXOAA4 was at MIN ATT setting m Record the exact relative dB reading this will be used as the 10 dB comparison for repeatability Adjust the attenuation to 20 00 dB by sending the command ATT DB 20 to the VXOAAI Record the relative dB power
16. and Disable Procedure 2 If you have not already done so connect an optical source to the input of the VXOA41 using an optical fiber jumper cable of equal or lesser core diameter than the VXOA41 see Specifications for the core diameter of the particular VXOAA under test m source should be relatively stable 20 1 dB stability over 1 minute and should emit at least 1 mW of optical power into the fiber jumper used for input to the VXOA41 The source must emit light at a wavelength within the specifications of the VXOA41 700 nm to 1600 nm An average optical power meter is required The meter should be able to accept the fiber type of the jumpers being used 3 Before continuing cap the input to the Optical Power Meter and properly zero the meter 4 Sendthe command DIS 0 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 VXOAAI VXOAA Optical Attenuator User Manual G 5 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification G 6 6 Connect the other end of the fiber jumper to the input of the Optical Power Meter 7 Record the power reading from the Optical Power Meter as Po 8 Ifarelative dB mode is available on the Power Meter set the dB reference level of the Power Meter to the measured Po value 9 Send the command DIS 1 this cause
17. binary 11010001 which enables the PON URQ EXE and OPC bits DESE Might return the string DESE 186 showing that the DESER contains the binary value 10111010 To query or set the status of the light shutter use the DISable term A DISable argument of 1 or ON closes the light shutter and blocks all light through the fiber ports A DISable argument of 0 or OFF opens the shutter and allows light to pass through the fiber ports light will be attenuated at the level specified by the ATTEN DB or ATTEN DBR terms N A DISable ON 1 DISable OFF 0 Disable DIS Returns the string DIS 0 if the light shutter is not closed 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 VXOAAI Optical Attenuator User Manual 3 19 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Related Commands Syntax Arguments Examples ESR Query Only Related Commands Syntax 3 20 CLS DESE ESR EVENT EVMSG SRE STB ESE lt NRf gt ESE lt NRf gt is a value in range from 0 through 255 The binary bits of ESER are set according to this value The power on default for ESER is 0 if PSC is 1 If PSC is 0 th
18. commas TEKTRONIX VXOA41 serial number gt CF 91 1CN RM firmware version number IDN Might return the response TEKTRONIX VX0A41 B010101 CF 91 1CN RM 1 5 The LRN Learn Device Setup or SET query returns a string listing the VXOA41 s settings except for calibration values You can use this string to return the VXOA41 to the state it was in when you made the LRN query HEADER VERBOSE Syntax LRN SET Q SET NOTE The LRN query always returns a string with command headers regardless of the setting of the 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 Examples Might return the string REFERENCE 0 00 WAVELENGTH 1300 ATTENUATION DB 0 00 DIS PLAY DB DISABLE 0 STORE1 0 00 STORE2 0 00 VXOAAI Optical Attenuator User Manual 3 25 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands OPC The OPC Operation Complete command generates the operation complete message in the Standard Event Status Register SESR when all pending operations finish The OPC query places the ASCII character 1 into the Output Queue when all pending operations are finished The OPC response is not available to read until all pending operations finish F
19. concatenations m DISABLE OFF ATT DBR 5 No colon before ATT m ATT MIN OPC Extra colon before a star command VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Command Syntax Message Terminators This manual uses EOI End of Input to represent a message terminator In VXI byte transfer protocol the EOI is represented as being bit 8 of the Byte Available and Byte Request word serial commands If bit 8 is set then EOI is associated with the current data byte for that word serial command When using VXI byte transfer protocol the VXOA41 always accepts the EOI interface symbol as an input message terminator The end of message terminator may be either the END message EOI asserted concurrently with the last data byte the ASCII code for line feed LF sent as the last data byte or both The end of message terminator should not immediately follow a semicolon The VXOA41 always terminates responses to queries with linefeed and EOI asserted 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 VXOA41 command utilizes a block argument form The elements of the block arguments described in Table 3 4 Table 3 4 Block Argument Elements Symbol Meaning Block A block of data bytes
20. events from the event queue and places them in the output queue A complete discussion of event handling is on page 3 35 ALLev CLS DESE ESE ESR EVMSG EVQty SRE STB EVENt CHEE gt EVENt Might return the response EVENT 110 showing that there was an error in a command header The EVMSg query removes from the Event Queue a single event code associated with the results of the last ESR read and returns the event code along with an explanatory message A complete discussion of event handling is on page 3 35 CLS DESE ESE ESR EVENT SRE STB EVMSg VXOAA Optical Attenuator User Manual 3 21 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Examples EVQTy Query Only Related Commands CBD EVMS Might return the message EVMSG 110 Command header error The EVQTy query returns returns the number of events associated with the last Standard Event Status Register read and thus the length of a subsequent response to an ALLev query The maximum number of event queue items is 32 CLS DESE ESE ESR EVMSG SRE STB Syntax EVQTy Examples X EVQT Might return the response EVQTY 4 showing that there are four events in the event queue FACTory No Query Form Related Commands Syntax 3 22 The FACTory command resets the to its factory default settings and purges stored settings
21. gt lt Event Code gt lt Comma gt lt QString gt lt QString gt lt Message gt lt Command gt lt Command gt 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 lt Message gt and lt Command gt strings combined The command string is right justified ALLev Might return the string 401 Power on ALLev Would return a string similar to the following if an unrecognized command were sent to the VXOA41 113 Undefined header unrecognized command abc VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands ATTenuation Related Commands ATTenuation can be used as both a query and as a command to set device parameters ATTenuation has three parameters DB DBR and MIN Use the DB term to query or set attenuation in absolute terms relative to minimum attenua tion To query or set attenuation values relative to the REFerence value use the DBR term To set the attenuation to the minimum 0 dB use the MIN term NOTE Attenuation can be changed even if the light shutter is closed STORe RECall Syntax ATTen DB ATTen DBR ATTen DB NRf ATTen DBR lt NRf gt ATTen MIN ATTen MIN ATTen om J Q Arguments If you make a query without an argume
22. in the DESER Thus each message is associated with a specific SESR bit In the message tables that follow the associated SESR bit is specified in the table title with exceptions noted with the error message text Table 3 12 lists the messages returned when the system has no events or status to report These have no associated SESR bit Table 3 12 No Event Messages Code Message 0 No events to report queue empty 1 No events to report new events pending ESR Table 3 13 lists the error messages generated by improper command syntax Check that the command is properly formed and that it follows the rules in the Command Syntax chapter starting on page 3 1 Table 3 13 Command Error Messages CME Bit 5 Code Message 100 Command error 101 Invalid character 102 S yntax error 103 Invalid message or unit separator 104 Data type error 105 GET not allowed 106 Invalid program data separator 108 Parameter not allowed 109 Missing parameter 110 Command header error 111 Header separator error VXOAA Optical Attenuator User Manual 3 41 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events 3 42 Table 3 13 Command Error Messages CME Bit 5 Cont Code 112 Message Program mnemonic too long 113 Undefined header 118 120 121 123 Query not allowed Numeric data error Invalid character in number Numeric overflow 124 128 1
23. lis tener utility on a controller with a GPIB card for example an IBIC DOS or Windows utility NOTE Throughout this procedure the terms send the command send the query and the query response refer to using this utility to send and receive the IEEE 488 2 message based command queries to the 41 The actual text in this procedure that is sent to or received from the VXOA41 appears in a different typeface for example HEADER m Averaging Optical Power Meter with the following requirements m 0 01 dB resolution m 0 005 dB stability m 65 dBm sensitivity m Relative dB level to arbitrary reference capability m Sensitive 260 dB range at 850 nm 1300 nm and 1550 nm m Tektronix OCP5502 or OCP5002 can be used for the VXOA41 standard option 1 or option 2 although the Shutter Attenuation test will only be able to be verified to 70 dB the OCP s sensitivity limits the 100 dB attenuation measurement An OCP can not be used for testing the VXOA41 option 3 due to the OCP s 62 5 um fiber input and the VXOA41 option 3 s 100 um fiber size REV JUL 1993 VXOAA Optical Attenuator User Manual G 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification m A Stable Optical Source with the following requirements m Greater than 0 01 dB stability over 1 minute m Output greater than 1 mW of optical power into the fiber
24. m ner rhe ar hh EF Getting Started Getting Started 2222222 2 22 22 5 545 6866 65 5 6666 1 1 First Time Operation 1 1 Installation eter ries 1 2 Checkout Procedure 2 tuputa Seb eret rh er p EE 1 6 Operating Basics Operating Basis 1 seco eR rrr RE ere Ro E TET 2 1 Front Panel Indicators and Connectors 2 1 Reference Command Syntax 3 1 Cl aring the VXOAA secretes eree mifer Lae Re A EX HE EY 3 1 Command and Query Structure 3 1 Command Entty 2552245 pte RR heey paras A RICE RE CI REN E E pe Ts 3 3 Argument Types i n pe RECEN ERI BAUR EH CR e edes 3 5 Syntax Rabe RR Oe Rates pa ber ges 3 7 Commands 3 9 Common Commands and Queries 3 9 Device Commands and Queries 3 11 ADJusting Query Only 3 11 Query Only 3 12 2 354 RA ex Be PR He pU PSU PUE 3 13 ATTenuation INCRement 3 14 ATTenuation NEXT wee Eee eR pp ey RO PEE RE EE PTS 3 14 AT
25. module and push the module into the mainframe as far as it will go without forcing it This should seat the P1 and P2 connectors VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started NOTE If the 41 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 V XI connectors and that the front panel of the module is flush with the front of the mainframe chassis Tighten the module retainer screws at the top and bottom of the front panel to secure the module in the mainframe Removing the VXOA41 Use the following steps to remove the VXOA41 from a Tektronix mainframe If from a VXI Mainframe use the VXOAAI with another mainframe you may have to modify this procedure 1 Ensure that the rear panel power ON OFF switches and the front panel ON STANDBY switch on the mainframe are in the OFF and STANDBY positions respectively 2 Loosen the module retainer screws gt Grasp both handles of the module and pull the module straight out of the mainframe as shown in Figure 1 2 A D LZ 77 Figure 1 2 Removing the VXOA41 from the Mainframe 4 Once the module has been removed store it in a static free environment VXOAAI Optical Attenuator User Manual 1 5 A
26. path VXOA41 Optical Source Figure G 2 First setup for Insertion Loss Procedure 4 If you have not already done so connect the 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 m source should be relatively stable 20 1 dB stability over 1 minute and should emit at least 1 uW 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 Plongl m Ifarelative dB mode is available on the Power Meter set the dB reference level of the Power Meter to the measured Plong1 value VXOAA Optical Attenuator User Manual G 7 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification VXOA41 Optical Source Optical Power Meter Figure G 3 Second setup for Insertion Loss Procedure 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 8 Sendthe command ATT MIN to the VXOA41 check to see
27. section VXOAA Optical Attenuator User Manual 1 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started Installation 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 V XI mainframe 5 Verify that you can communicate with the VXI module as described in the Checkout Procedure After unpacking all components inspect them for any damage that may have occurred due to shipping You can install the VXOA41 into any appropriate C or D size VXI mainframe in slots 1 12 Verify that the mainframe can provide adequate power and cooling for the module Table 1 1 lists the VXOA41 power requirements The power and cooling requirements are also labeled the VXOA41 side cover as well as in Specifications later in this manual Table 1 1 VXOA41 Module Power Requirements Voltage Average Current Maximum Current 24 V 72 320 24V 31 mA 40 mA 12 V N A N A 12 V N A N A 21A 23 52V 34 mA 50 mA 2V 30 mA 680 mA WARNING Shock hazards exist due to high currents within the mainframe compartment Do not configure the Bus Grant and Interrupt Acknowledge jumpers unless you are technically qualified to do so Before installing the VXOA41 in a VXI mainframe a technically qualified person should verify that the slo
28. that MIN ATT LED is lighted 9 Record the new reading of the Optical Power Meter as Plong2 if the dB relative mode is available then record the new reading s value relative to the Plong1 0dB reference If the Relative dB mode is not available the relative dB Insertion Loss is calculated as Plong2 Long Wavelength Insertion Loss dB 10 log Plongl m The Long Wavelength Insertion Loss should be less than 2 0 dB that is less than 2 0 dB Insertion Loss G 8 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification Insertion Loss Short Wavelengths 1 Properly zero the Average Optical Power Meter to be used VXOA41 Optical Source Optical Power Meter Figure G 4 First setup for Insertion Loss Procedure 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 VXOAALI see page B 1 for the core diameter of the particular 41 under test m The source should be relatively stable 20 1 dB stability over 1 minute and should emit at least 1 u Watt of optical power into the fiber jumper used The source must emit light at a wavelength within the specifica tions of the VXOA41 short wavelength insertion loss 700 nm to 1100 nm 3 Ensure tha
29. the switch to the desired address before installing the VXOA41 in the mainframe If the system resource manager supports Dynamic Auto Configure you can set the switch to 255 FF At power on the logical address will automatical ly be configured For proper operation the logical address must be unique in the VXI system In other words no two modules in the VXI system can have the same logical address VXOAAI Optical Attenuator User Manual 1 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started N _ lt gt OFF 0 When Down When Down Rectangular hole in right side shield 9 LI Figure 1 1 Logical Address Switch location on the VXOA41 A 1 4 2 Ensure that the rear panel power ON OFF switches and the front panel 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 Connecting the P1 and P2 connectors of the module to the P2 and P3 connectors of the mainframe can severely damage the VXOA41 or the mainframe Carefully insert the module into the mainframe top and bottom guides in the slots where you plan to install the
30. the three wavelengths described in the opening paragraph of this procedure VXOAAI Optical Attenuator User Manual G 13 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification G 14 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com apsii Appendix Replaceable Parts This appendix contains a list of the components that are replaceable for the VXOAAI 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 Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is important to include the following information in your order m Part number m Instrument type or model number m Instrument serial number m Instrument modification number if applicable If a part you order has been replaced with a different or improved part your local Tektronix service center or representative will contact you concerning any change in the part number Change information if any is located at the rear of this manual Using the Replaceable
31. 19 3 37 DESER register 3 18 3 27 3 37 Device Clear 3 1 Device command List 3 11 device identification number C 1 diagnostics 1 6 Diagram Syntax 3 7 DISable command 3 19 Dispersion Glossary 1 Documentation A 1 Dynamic Auto Configure 1 3 1 5 E EOI end of input 3 5 Error message Programming interface 3 41 ESE command 3 19 3 20 3 38 ESER register 3 19 3 27 3 38 ESR command 3 20 3 21 ESR query 3 35 Event handling 3 40 Event Quantity query 3 22 Event query 3 21 3 22 Event queue 3 21 3 22 3 39 EVENt command 3 21 EVMSg command 3 21 3 22 EVQty command 3 22 F FACTory command 3 22 3 23 front panel description 2 1 2 2 Index 2 Artisan Technology Group Quality Instrumentation H Header Command 3 2 Included in query response 3 24 3 32 3 33 HEADer command 3 24 DN query 3 24 3 25 IEEE Std 488 2 1987 3 9 IEEE Std 488 2 1987 3 1 installation module 1 3 1 5 installation procedures 1 2 1 5 L LED Accessed 2 1 ATT ADJ 2 1 DISABLE 2 1 MIN ATT 2 1 module status 2 1 Ready 1 6 2 1 List Common command 3 9 Device command 3 11 LRN query 3 25 Manuals A 1 manufacturer identification number 1 Message Command 3 2 Command terminator 3 5 Table of program messages 3 41 Mnemonic Command 3 2 Mode Glossary 1 module installation 1 3 1 5 Multi mode Fiber Glossary 1 N Numeric Command argument 3 6 Num
32. 2 protocol m Supports VXIbus instrument protocol m No extended long word protocol m No longword protocol The VXOA41 manufacturer identification number is 4093 The VXOA41 device identification number is 4080 Both of these numbers are printed on the label located on the right side shield of the VXOA41 VXOA41 Optical Attenuator User Manual C 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 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 _ 0 2 3 4 s 5 32 112 9 8 3 ETX 3 5 s 4 EOT DC4 4 D T d t 4 20 36 52 68 84 100 116 117 m Z gt Q aS c c gt o lt Z go o T lt m m j u O z 00 o gt gt lt gt x 120 m lt lt 122 114 lt m o O gt m o c c N 11 27 438 59 75 91 107 123 12 28 60 76 92 108 124 18 29 45 61 7T 93 109 125 m E gt 2 F SI US rubout 15 31 47 63 79 95 111 127 C 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrument
33. 3 30 3 36 STORe command 3 31 See also RECall command Syntax BNF Backus Naur form 3 1 Diagram 3 7 system resource manager 1 3 T Table ASCII character 2 Common command 3 9 Device command 3 11 Programming message 3 41 Tek Std Codes and Formats 1989 3 9 Terminator Command message 3 5 TST query 3 31 3 32 V VERBOSE command 3 32 3 33 VXI mainframe 1 2 backplane jumpers 1 2 VXIbus specification version C 1 W WAJI command 3 33 Wait for operation complete 3 33 WARNING statement in manual v Warning optical output vi WAVelength command 3 33 Word Serial Commands Abort Normal Operation 3 Assign Interrupter Line 3 Asynchronous Mode Control 3 Begin Normal Operation 3 Byte Available 3 Byte Request 3 Clear 3 Clear Lock 3 Index 3 Guaranteed 888 88 SOURCE www artisantg com Index Control Event 4 End Normal Operation 4 Read Interrupter Line 4 Read Interrupters 4 Read Protocol C 4 Read Protocol Error 4 Read STB C 4 Set Lock C 4 Trigger C 4 word serial protocol 1 1 Index 4 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888
34. 30 131 Too many digits Numeric data not allowed Suffix error Invalid suffix 134 138 140 Suffix too long S uffix not allowed Character data error 141 Invalid character data 144 148 150 151 Character data too long Character data not allowed String data error Invalid string data 158 String data not allowed 160 161 168 Block data error Invalid block data 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 200 220 Message Execution error Parameter Error 221 Settings in conflict VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events Table 3 14 Execution Error Messages EXE Bit 4 Cont Code Message 222 Data out of range 223 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 Code Message 300 Internal error 310 System error 313 Calibration memory lost 315 Configuration memory lost 350 Too many events does not set DDE bit Table 3 16 lists the system event messages These messages are generated whenever certain system conditions occur Table 3
35. 88 SOURCE www artisantg com 4 rtisan tisan Technology Group is your source for quality Femoog Ge new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment EQUIPMENT DEMOS HUNDREDS OF InstraV ea REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com Z information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED Contact us 888 88 SOURCE sales artisantg com www artisantg com
36. B Insertion Loss G 10 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification Repeatability and Accuracy Although the repeatability of the VXOAAL is specified over the entire wave length range 600 nm 1700 nm the 0 15 dB accuracy error typically 0 05 dB specification is only specified for wavelengths within 20 nm of 850 nm 1300 nm and 1550 nm This test must be repeated three times with three different stable optical sources at the three specified wavelengths to fully verify the accuracy of the VXOA41 A single source is sufficient though to verify the repeatability of the VXOA41 NOTE This test requires an Optical Source and an Average Optical Power Meter In order to verify the repeatability of the VXOA41 the Optical Source and Power Meter must both be very stable 20 01 dB the repeatability of the measurement devices must be greater than the value being measured It is necessary that the optical fibers used to carry the signal from the source to the VXOA41 and then to the Power Meter are not disturbed or moved during this test VXOA41 Optical Source Optical Power Meter 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 VXOAAI to the Optical Power
37. ENUATION TRIGGER TTLTRG7 VXOAAI Optical Attenuator User Manual 3 15 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands ATTenuation TPOLarity Related Commands Syntax Arguments Examples BLRN Related Commands Syntax 3 16 The ATTenuation TPOLarity command sets the polarity of the VXI TTL trigger line used to monitor the attenuator adjusting status ATTenuation TRIGger ATTen TPOLarity 0 1 ATTen TPOLarity O The numeric argument can be either 0 or 1 When the argument is 0 the trigger line specified with the ATT TRIG command is asserted when the attenuator is busy adjusting and unasserted when the attenuator is stable If the argument is 1 the trigger line will be unasserted when the attenuator is busy adjusting and asserted when it is stable ATT TPOL 0 Sets the polarity of the TTL trigger line so that the line is asserted when the attenuator is busy ATT TPOL Might return the string ATTENUATION TPOLARITY 1 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 LRN BLRN Block BLRN VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Examples BLRN Might re
38. MAV A complete discussion of these registers and bits and of event handling in general is on page 3 35 The DESE Device Event Status Enable command sets and queries the bits in the Device Event Status Enable Register DESER The DESER prevents events from being reported to the Standard Event Status Register SESR and from being entered into the Event Queue For a complete discussion of the use of these registers see page 3 35 CLS ESE ESR EVENT EVMSG SRE STB DESE NRf DESE lt NRf gt is a value in the range from 0 to 255 The binary bits of the DESER are set according to this value For example DESE 209 sets the DESER to the binary value 11010001 that is the first bit in the register is set to 1 the second bit to 1 the third bit to etc The power on default for DESER is all bits set if PSC is 1 If PSC is O the DESER maintains its value through a power cycle NOTE Setting the DESER and the ESER to the same value allows only those codes to be entered into the Event Queue and summarized on the ESB bit bit 5 of the Status Byte Register Use the ESE command to set the ESER A complete discussion of event handling is on page 3 35 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Examples DiSable Related Commands Syntax Examples ESE DESE 209 Sets the DESER to
39. Name amp Description Mfr Mfr Part No Index No Part No Effective Dscont Code G 1 1 200 4124 00 1 COVER SIDE VXI C SIZE 0 032 ALUM 5052 80009 200412400 2 211 0311 00 16 SCREW MACHINE 4 40 X 0 125 L FLH 100 DEG STL TK0435 ORDER BY DESC 3 426 2489 00 2 FRAME SECTION RAIL TOP amp BOTTOM ALUMINUM 80009 426248900 4 211 0101 00 8 SCREW MACHINE 4 40 X 0 25 FLH 100 DEG STL TK0435 ORDER BY DESC 5 200 4043 00 1 COVER SIDE VXI C SIZE 0 032 ALIM 5052 80009 200404300 6 334 8657 00 1 MARKER IDENT MKD TEKTRONIX VXOA41 OPT ATTEN 80009 334865700 7 210 0405 00 4 NUT PLAIN HEX 2 56 X 0 188 BRS 13143 12157 50 8 367 0448 00 2 HANDLE CARRYING GEMINI 62559 20808 004 9 211 0334 00 4 SCREW SHOULDER 4 40 X 0 4 HEX HD BRASS 80009 211033400 10 334 8600 00 1 MARKER IDENT MKD 41 0KB05 334 8600 00 11 334 8595 00 1 MARKER IDENT MKD TEKTRONIX VXOA41 0 05 334 8595 00 ACCESSORIES 070 8777 00 1 MANUAL TECH USER VXOA41 80009 070877700 020 1885 00 1 ACCESSORY CONVERTER 80009 020188500 VXOAA Optical Attenuator User Manual H 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix H Replaceable Parts Figure H 1 VXOA41 Replaceable Parts H 4 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com __ 7 Glossary and
40. Parts List The tabular information in the Replaceable Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you find the all the information you need for ordering replacement parts Item Names In the Replaceable Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further Item Name identification U S Federal Cataloging Handbook H6 1 can be used where possible Abbreviations Abbreviations conform to American National Standards Institute ANSI standard Y1 1 VXOAA Optical Attenuator User Manual H 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix H Replaceable Parts CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Mfr Manufacturer Address City State Zip Code Code TK0435 LEWIS SCREW CO 4300 5 RACINE AVE CHICAGO IL 60609 3320 0 05 NORTH STAR NAMEPLATE 1281 5 NE 25TH HILLSBORO OR 97124 62559 SCHROFF INC 170 COMMERCE DR WARWICK RI 02886 2430 13143 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 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix H Replaceable Parts Fig amp Tektronix Serial No Qty 12345
41. R registers are set to 0 at power on When PSC is FALSE the current values in the DESER SRER and ESER registers are preserved in non volatile memory when power is shut off and restored at power on For a complete discussion of the use of these registers see page 3 35 DESE ESE RST SRE PSC NRf PSC lt NRf gt is a value in the range from 32767 to 32767 lt NRf gt 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 lt NRf gt z 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 Using an out of range value causes an execution error PSC 0 Sets the power on status clear flag to FALSE PSC Might return the value 1 showing that the power on status clear flag is set to TRUE RECall No Query Form Related Commands The RECall command sets the attenuation of the instrument to either stored value 1 or 2 STORe VXOAA Optical Attenuator User Manual 3 27 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax REFerence Related Commands Syntax Arguments Examples RST No Query Form 3 28 RECall 1 2 Gn me This command reads and sets the reference used when returning the attenuation in the ATT REF mode The units for command mo
42. S RR ee ee eed 3 28 ud A ner 3 29 1B Query ONIY eee ser Sees TURNUS RS s ema 3 30 SPOR Cig grat cs su sasa 3 31 Query Only us censere ERAS eee Meee P i es 3 31 VERBOSE eld a be ute Raa Ed D 3 32 WAI No Query Form 3 33 WAVelenpth iG Eee VER eae REA E NES E EU 3 33 Status and Eyenfs howe uti ke suwa FR EGRE Ra RR Se 3 35 MP 3 35 QUEUES is eg ce bbs 3 39 Event Handling Sequence 3 39 ContliGls Re et exiles Dee veau e eer eR tpa 3 40 M SSaBeS i in 3 41 Appendices Appendix Accessories and Options 1 Standard Accessories 1 Optional Accessories 1 OptlODS ER E ees 2 Appendix B Specifications B 1 Appendix C Interface Specifications C 1 Interface Standard s seres ase ace rase C 1 Character Set ASCII Chart 1 55 ese che aw eee te ages C2 VXI Word Serial Commands C 3 Appendi
43. SOURCE www artisantg com Command Syntax 3 8 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com p Commands VXOA41 commands fall into two main groups Common Commands Device Commands The commands follow Tektronix Standard Codes and Formats 1991 Most of these commands can be used either as set commands or queries However some commands can only be used to set these have the words No Query Form included with the command name Other commands can only be used to query these have a question mark appended to the header and include the words Query Only in the command name Headers mnemonics and arguments are usually spelled out fully in text with the minimum required spelling shown in upper case For example to use the command RECall you must enter at least REC 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 Table 3 6 lists the Common Commands supported by the VXOAAI Complete descriptions of these commands appear in an alphabetical listing of commands later in this section VXOAAI Optical Attenuator User Manual 3 9 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com
44. Tenuation TRIGger 3 15 ATTenuation TPOLarity 3 16 BLRN LBS PER v few beet bee ben PUER s QS ES ss 3 16 CAL Query Only taa s E Re YER YE ex RI PEE RU PUE RET 3 17 CLS No Query Form 2 3 17 ESE Po 3 18 fen LEGS bas RUE pba Per pO PU per EE 3 19 ESB POR ECHO 3 19 ESR Query Only ERR RR RR 3 20 EVENt Query Only 3 21 EVMSg Query Only 3 21 EVQTy Query 3 22 No Query Form 3 22 selec ide dre RUE Pe sau Hane Rib wack ponas Tuna qa 3 24 IDN Query Only 2 1 3 24 LRN Or dis 3 25 VXOAAI Optical Attenuator User Manual i Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents uo cM 3 26 OPE Query Only dtt Aine bah oh kus bus 3 26 eer e TEL 3 27 RECall No Query 3 27 tune pus Ree eR ne ts 3 28 RST No Query Form s sr RR RR RE
45. These symbols appear on equipment 7 AN DANGER Protective ground ATTENTION High Voltage earth terminal Refer to manual VXOAA Optical Attenuator User Manual V Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Safety Summary Specific Precautions Optical Output A Power Source Grounding the VXOA41 Use the Proper Power Cord User the Proper Fuse Do Not Remove Covers or Panels Do Not Operate in Explosive Atmospheres vi Observe all of these precautions to ensure your personal safety and to prevent damage to either the VXOA41 or equipment connected to it WARNING 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 The VXOA41 is designed for operation in a C size or D size VXI mainframe ensure safe operation follow all precautions listed in the instrument s documen tation Do not attempt to operate the VXOA41 with any other power source The VXOA41 is grounded through the VXI mainframe To avoid electric shock plug the mainframe power cord into a properly wired receptacle where earth ground has been verified by a qualified service person Without the protective ground connection all pa
46. VXI mainframe power on via mainframe s power switch A few seconds are required after mainframe power up before the slot 0 resource manager deasserts system reset and the VXOA41 READY LED lights 3 The wavelength and attenuation settings will power up at whatever values existed before the previous power down if the instrument is being powered on for the first time the settings will be at their factory default values 4 Send the command HEADERS 1 to the VXOA41 this ensures that query responses from the instrument are prefixed in the fullest and most explanato ry way the examples of this procedure assume that the headers are turned on NOTE Whenever the VXOA41 is accessed over the VXI Bus with either a command or query the amber ACCESSED LED on the front panel should light briefly The length of time the LED is lighted is relatively short tenths of seconds depending on the speed of the controller but it is usually observable by the user 1 Check that the READY LED is lighted green m This should stay lighted while the mainframe is on and the controller is not in RESET VXOAA Optical Attenuator User Manual G 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification Send the command this causes the instrument to adjust to zero dB a few seconds may be needed to complete the adjustment if the previous setting wa
47. and is the same as the set form but with a question mark on the end For example the set command ATT DB has a query form ATT DB Not all commands have both a set and query form some commands are set only and some are query only A command message is a command or query name followed by any information the VXOAA needs to execute the command or query Command messages consist of three different element types defined in Table 3 2 and shown in the example in Figure 3 1 Table 3 2 Command Message Elements Symbol Header Mnemoni c Argument Meaning The basic command name If the header ends with a question mark the command is a query The header may begin with a colon character if the command is concatenated with other commands the beginning colon is required The beginning colon can never be used with command headers beginning with star A header sub function Some command headers have only one mnemonic If a command header has multiple mnemonics they are always separated from each other by a colon character A quantity quality restriction or limit associated with the header Not all commands have an argument while other commands have multiple arguments Arguments are separated from the header by one or more space characters Arguments are separated from each other by a lt Separator gt which is defined below lt Separator gt Header ATT DB 10 Mnemonics Argument A separator betw
48. aranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operating Basics This section provides a brief description of the indicators and connectors of the VXOAA Optical Attenuator Front Panel Indicators and Connectors A The VXOA41 front panel indicators and connectors consist of five LEDs light emitting diodes and two connectors as shown in Figure 2 1 Two of the front panel LEDs show the module status The READY LED is a green LED that lights when the power on diagnostics have successfully completed 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 The ATT ADJ LED is a red LED that lights when the attenuation is being changed When it is dark the requested attenuation level has been achieved The MIN ATT LED is a red LED that lights when the attenuation level has been set to the minimum level The DISABLE LED is a red LED that lights when the internal shutter has moved across the optical path Maximum attenuation is acheived when the internal shutter blocks the optical path The two connectors on the front panel are FC PC style connectors The top connecto
49. ation Guaranteed 888 88 SOURCE www artisantg com Appendix C Interface Specifications VXI Word Serial Commands Abort Normal Operation Assign Interrupter Line Asynchronous Mode Control Begin Normal Operation Byte Available The VXOA41 recognizes the following VXI word serial commands These commands are described in the V XIbus Specification Version 1 3 Each word serial command is a 16 bit word that the Slot O controller sends to the instrument via its data low register Halts any pending or active operations from the bus and goes into the CON FIGURE substate of the PASSED state While in the CONFIGURE substate the DIR bit in the response register is 0 and the instrument cannot accept commands via the Byte Available or Byte Request word serial commands A Begin Normal Operation command is required to put the instrument into the NORMAL OPERATION substate Assigns a VME interrupt line for use This interrupt line is used the same way as the SRQ line is used in a GPIB system The instrument can be configured to generate an interrupt on the assigned interrupt line when an event is activated Enables the generation of events by the instrument The only valid setting of this command is to enable disable events that can generate an interrupt Signals and responses are not supported Sent by the resource manager of the system to take the instrument out of the CONFIGURE substate and into the NORMAL OPERATION substate A
50. c Argument Descriptions Symbol Meaning lt NR1 gt Signed integer value lt NR2 gt Floating point value without an exponent lt NR3 gt Floating point value with an exponent lt NRf gt Flexible numeric argument NR1 NR2 NR3 A suffix composed of a multiplier letter exponent and units may be used as an alternate to NR3 For example this numeric type would let you use 10nm as an alternate to 10E 9m VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Command Syntax Syntax Diagrams The syntax diagrams in this manual use the following symbols and notation m Circles and ovals contain literal elements that must be sent exactly as shown Command and query names are abbreviated to the minimum required spelling Boxes contain the defined elements described earlier in this section such as lt NRf gt or lt QString gt m Arrows connect the elements and show the allowed paths through the diagram Parallel paths show that one and only one of the paths must be taken 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 o Figure 3 3 Typical Syntax Diagrams VXOAA Optical Attenuator User Manual 3 7 Artisan Technology Group Quality Instrumentation Guaranteed 888 88
51. cal Fiber Connector Figure F 1 Removing the Optical Bulkhead Connector Changing the Optical Port Connectors The VXOA41 is shipped with the FC connector bulkhead and dust cover installed 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 3 Gently pull the bulkhead out of the unit and unscrew the fiber connector Be careful not to pull beyond the fiber slack If there is insufficient slack or if you accidently push the disconnected fiber back into the instrument then perform the following three steps F 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix F Maintenance a Using a Phillips screwdriver remove the screws that secure the side cover and then remove the side cover See Figure F 1 b You will now have access to the optical fiber Unscrew it from the bulkhead if necessary or push it back through the front panel c 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 VXOAA Optical Attenuator User Manual F 3 Artisan Technology Group Quality Instrum
52. ce specifications The Output Queue m The Standard Status Register Enable setting m Standard Event Status Enable setting m The Power on status clear flag setting m HEADer and VERBose settings The SRE Service Request Enable command sets and queries the bits in the Service Request Enable Register SRER For a complete discussion of the use of these registers see page 3 35 ALLev CLS DESE ESE ESR EVENT EVMSG EVQty PSC STB VXOAAI Optical Attenuator User Manual 3 29 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Returns Arguments Examples STB Query Only Related Commands Syntax Examples 3 30 SRE lt NRf gt SRE lt NRf gt is a value in the range from 0 to 255 The binary bits of the SRER are set according to this value Using an out of range value causes an execution error The power on default for SRER is 0 if PSC is 1 If PSC is 0 the SRER maintains its value through a power cycle SRE 48 Sets the bits in the SRER to 00110000 binary SRE Might return a value of 32 showing that the bits in the SRER have the binary value 00100000 The STB Read Status Byte query returns the Status Byte Register SBR using the Master Summary Status MSS bit For a complete discussion of the use of these registers see page 3 35 ALLev CLS DESE ESE ESR EVENT EVMSG EVQty SRE
53. cification 0 C to 450 C 32 F to 122 F Nonoperating storage Humidity Operating and Nonoperating 40 C to 70 C 40 F to 160 F Meets MIL T 28800D class 5 95 RH 11 C to 30 C 52 F to 86 F 15 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 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix B Specifications Table B 3 Environmental Performance Cont Characteristic Vibration Shock Bench Handling Packaged Product Vibration and Shock Specification 0 38 mm 0 015 in p p 5 Hz to 55 Hz 75 minutes Meets MIL T 28800D Class 5 when installed in qualified power modules 30 g s 1 2 sine 11 ms duration 3 shocks in each direction along 3 major axes 18 total shocks Meets MIL T 28800D Class 5 when installed in qualified power modules 12 drops from 45 4 in or equilibrium whichever occurs first Meets MIL T 28800D Class 5 when installed in qualified power modules and IEC 348 Electronic measuring apparatus The packaged product qualifies under the National S afe Transit Association s P reshipment Test P rocedures Project 1A B 1 and 1 2 Table B 4 Certifications and compliances Characteristic Specification Meets intent of Directive 89 336 EE C for El
54. command m SRER 0 equivalent to an SRE command Sending PSC 0 lets the Enable Registers maintain their values in nonvolatile memory through a power cycle NOTE To enable the PON Power On event to generate a Service Request send 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 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events Queues The Output Queue The Event Queue The VXOA41 status and event reporting system contains two queues the Output Queue and the Event Queue The Output Queue stores up to 8000 bytes of a query response while it is waiting to be output The Output Queue is emptied each time a new command or query message is received Because of this all query responses must be read before the next command or query is sent otherwise responses to earlier queries will be lost and an error may result The Event Queue stores detailed information on up to 32 events If more than 32 events fill the Event Queue the thirty second event is replaced by event code 350 many events To read the Event Queue use either the EVENT query which returns only the event number or the EVMSG query which returns the event number and a text description of the event
55. d Table 3 10 Each bit in a Status Register records a particular type of event such as an execution error or service request When an event of a given type occurs the bit that represents that type of event is set to a value of one You can disable bits so that they ignore events and remain at zero see the Enable Registers section on page 3 37 Reading the status registers tells you what types of events have occurred The Standard Event Status Register SESR The SESR shown in Figure 3 4 records eight types of events that can occur within the VXOA41 Use the ESR query to read the SESR register Reading the register clears the bits of the register so that the register can accumulate information about new events VXOAAI Optical Attenuator User Manual 3 35 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events 7 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE ROC OPC Figure 3 4 The Standard Event Status Register SESR Table 3 10 SESR Bit Functions Bit Function 7 MSB PON Power On Shows that the VXOA41 was powered on 6 URQ User Request Not used 5 CME Command Error Shows that an error occurred while the VXOA41 was parsing a command or query Table 3 13 on page 3 41 lists Command error messages 4 EXE Execution Error Shows that an error occurred while the VXOA41 was executing a command or query Table 3 14 on page 3 42
56. de and responses is dB Values smaller than 0 01 dB are rounded to the nearest one hundredth dB The REF value may not exceed 99 99 The combination of the REF value and the ATTen value may not exceed 399 99 For example if the ATTen value is set to 30 dB and the REF value is set to 70 dB the resultant ATT REF value would be 100 dB and an execution error event would result The factory default for REF is 0 00 dB N A REFerence NRf REFerence lt NRf gt is a number that cannot exceed 99 99 REF 45 00 Sets the REFerence value to 45 00 dB REF Would return the string REF 45 00 The RST Reset command returns the VXOA41 to a known set of instrument settings VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands SRE Related Commands Syntax Related Commands NOTE The RST command can take 5 to 10 seconds to complete depending on attenuation settings PSC FACTory RST RST does the following m Puts the VXOAALT into the Operation Complete Command Idle State m Puts the VXOAALT into the Operation Complete Query Idle State m Returns the instrument settings to those listed on page 3 23 The RST command does not alter the following m The state of the IEEE Std 488 2 interface The selected IEEE Std 488 2 address of the VXOA41 Calibration data that affects devi
57. e ESER maintains its value through a power cycle NOTE Setting the DESER and the ESER to the same value allows only those codes to be entered into the Event Queue and summarized on the ESB bit bit 5 of the Status Byte Register Use the DESE command to set the DESER A complete discussion of event handling is on page 3 35 ESE 209 Sets the ESER to binary 11010001 which enables the PON URQ EXE and OPC bits ESE Might return the string ESE 186 showing that the ESER contains the binary value 10111010 The ESR Event Status Register query returns the contents of the Standard 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 ALLev CLS DESE ESE EVENT EVMSG SRE STB ESR VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Examples EVENt Query Only Related Commands Syntax Examples EVMSg Query Only Related Commands Syntax CERO ESR Might return the value 213 showing that the SESR contains binary 11010101 The EVENt query returns from the Event Queue an event code that provides information about the results of the last ESR read EVENT also removes the returned value from the Event Queue Note that the ALLev command removes all pending
58. ectromagnetic EC Declaration of Conformity EMC Compatibility Compliance was demonstrated to the following specifications as listed in the Official J ournal of the European Communities EN 50081 1 Emissions EN 55011 Class A Radiated and Conducted Emissions EN 60555 2 AC Power Line Harmonic Emissions EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge Immunity IEC 801 3 Electromagnetic Field Immunity IEC 801 4 X Electrical Fast Transient B urst Immunity IEC 801 5 Power Line Surge Immunity FCC Compliance VXOA41 Optical Attenuator User Manual Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class A Limits Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix B Specifications B 4 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com s 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 m No commander capability m No Signal Register m No VMEbus master capability m No Fast Handshake m No Shared Memory W No Response Generator m Can generate events m Has programmable interrupter m No interrupt handling m Has Trigger word serial command m Supports VXIbus 488
59. een arguments of multiple argument commands The separator can be a single comma or it may optionally have white Space characters before and after the comma 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 lt Header gt lt Space gt lt Argument gt lt Separator gt lt Argument gt 3 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Command Syntax Queries Headers in Query Responses Command Entry Queries cause the VXOA41 to return information about its status or settings Queries have the structure lt Header gt lt Header gt lt Space gt lt Argument gt lt Separator gt lt Argument gt You may use only a part of the header in a query command When you do this the instrument returns information about all the possible mnemonics that you have left unspecified For example ATT DB returns the current setting in absolute dB units while ATT returns the setting in absolute units and units relative to the reference as well as all other ATT parameters You can control whether or not headers are returned by the VXOA41 as part of the query response Use the HEADER command to control this feature If HEADER is on command headers are returned as part of the query and the query r
60. entation Guaranteed 888 88 SOURCE www artisantg com Appendix F Maintenance Figure F 4 DIN 47256 Optical Bulkhead Assembly 4 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 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 VXOAA Optical Attenuator User Manual F 5 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix F Maintenance F 6 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com F Appendix G Performance Verification Equipment List m Tektronix VX1400 or VX1405 Mainframe or any VXI C size or D size mainframe with a minimum cooling capacity of 1 5 liters sec at 0 04 mm H 0 see the Installation section of the Getting Started chapter in this manual m AVXIslot 0 controller and or Resource Manager for example a Tektronix VX452 Resource Manager or a Radisys EPC 2 controller m A software utility to send and receive VXI message based commands and queries to a VXI device if using an EPC 2 controller this can be the BusProbe utility if using the VX4521 then this can be any GPIB talker
61. enuation INCRement Attenuation Increment ATTenuation NEXT Command Trigger ATTenuation TRIGger VXI Trigger Output ATTenuation TPOLarity VXI Trigger Output P olarity DISable Light Shutter Status RECa11 Recall Attenuation Setting REFerence Reference STORe1 2 Store Attenuation WAVelength Wavelength ADJusting Query Only The ADJusting query returns the status of the attenuator A 1 is returned if the attenuator is moving to some attenuation value A 0 is returned if the attenuator is stationary Related Commands OPC WAI Syntax ADJusting VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax ALLev Query Only Related Commands Syntax Returns Examples 3 12 ADJusting 2 ADJ Would return the string ADJUSTING 0 or ADJUSTING 1 query causes the VXOA41 to return all events and their messages This query also removes the returned events from the Event Queue The messages are separated by commas Use the ESR query to enable the events to be returned For a complete discussion of the use of these registers see page 3 35 This command is similar to repeatedly sending EVMsg queries to the VXOAAI CLS DESE ESE ESR EVENT EVMsg EVQTY SRE STB ALLev CAU gt O The event code and message in the following format Event Code gt lt Comma gt lt QString
62. erical Aperature Glossary 1 VXOAA Optical Attenuator User Manual Guaranteed 888 88 SOURCE www artisantg com Index 0 OPC command 3 26 Operation complete command 3 26 Operation complete wait 3 33 OPT command 3 26 Optical Cables optional accessories A 1 Optical Connector Kit optional accessories 2 Optical Output vi Output queue 3 39 P power requirements 1 2 Power on status clear command 3 27 PSC command 3 27 3 38 Q Query Header in query response 3 24 3 32 3 33 Query command 3 1 3 3 Queue Event 3 39 Output 3 39 R Ready LED 1 6 RECall command 3 27 3 28 REFerence command 3 28 Register DESER 3 18 3 27 3 37 ESER 3 19 3 27 3 38 SBR 3 30 3 36 SESR 3 17 3 20 3 21 SRER 3 27 3 29 3 30 removing the module 1 5 Reset See also FACTORY Command 3 28 3 29 RST command 3 28 3 29 S Safety Symbols v SBR register 3 30 3 36 Self test 3 31 3 32 Separator Command 3 2 Serial poll 3 36 Service request enable command 3 29 3 30 Service request enable register 3 29 3 30 26 3 35 3 3 38 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation SESR register 3 17 3 20 3 21 3 26 3 35 Set Command query 3 25 Query 3 25 Set command 3 1 3 2 SET query 3 25 Single mode Fiber Glossary 1 SRE command 3 29 3 30 3 38 SRER register 3 27 3 29 3 30 3 38 STB query
63. es use and the conventions the VXOAAT uses to process them The commands and queries themselves are listed in the section entitled Commands You transmit commands to the VXOA41 using the enhanced American Standard Code for Information Interchange ASCII character encoding Appendix C includes a chart of the ASCII character set This manual uses Backus Naur Form BNF notation and syntax diagrams to describe commands and queries The syntax diagrams follow the notations and conventions of the ANSI IEEE Std 488 2 1987 section 7 2 This manual uses the BNF symbols listed in Table 3 1 Table 3 1 BNF Symbols and Meanings Symbol Meaning lt gt Defined element HE Is Defined As Exclusive OR Group one element is required 1 Optional can be omitted Previous element s may be repeated Comment Clearing the VXOA41 You can stop any query or process by using the Clear VXI Word Serial com mand Command and Query Structure Commands consist of set commands and query commands usually simply called commands and queries Commands modify instrument settings or tell the VXOA41 to take a specific action Queries cause the VXOAAT to return information about its status VXOAA Optical Attenuator User Manual 3 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Command Syntax Most commands have both a set form and a query form The query form of the comm
64. esponse is formatted as a valid set command When HEADER is off only the values are sent back in the response which may be easier to parse and to extract informa tion from Table 3 3 shows the difference in responses NOTE Command queries that begin with an asterisk never return a header in the response per IEEE 486 2 Table 3 3 Comparison of Header On and Off Responses Query Header Off Response Header On Response EVENT 128 EVENT 128 ATT DB 32 53 ATT DB 32 53 When sending commands to the VXOA41 keep the following in mind m You can enter commands in uppercase or lowercase m Precede all commands with blank characters Blank characters include any combination of the ASCII control characters 00 through 09 and through 20 hexadecimal 0 through 9 and 11 through 32 decimal m The VXOA41 ignores commands consisting of any combination of blank characters carriage returns and line feeds VXOAAI Optical Attenuator User Manual 3 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Command Syntax Abbreviating Commands Concatenating Commands 3 4 You 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 y
65. fter receipt of this command the instrument asserts the DIR bit of its response register and is ready to accept commands via the Byte Available word serial command Indicates that the commander has put a byte of data into the data register This command is equivalent to a GPIB controller addressing an instrument to listen and then sending a byte of data to it Byte Request The commander is ready to receive a byte of data from the instrument as a result of a previous query Clear Causes the instrument to clear the VXIbus of any pending operations This is analogous to sending DCL or SDC on the GPIB Clear Lock Causes the instrument to exit the locked state sets the Locked bit of the response register The equivalent GPIB command is RTL VXOAA Optical Attenuator User Manual C 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix C Interface Specifications Control Event End Normal Operation Read Interrupter Line Read Interrupters Read Protocol Read Protocol Error Read STB Set Lock Trigger Enables the generation of events by the instrument The two event types supported are request true and request false When the instrument finishes any pending operations it enters the CONFIGURE substate While in the CONFIGURE substate the DIR bit in the response register is 0 and the instrument cannot accept commands via the Byte Available or Byte Request word ser
66. ial commands A Begin Normal Operation command is required to put the instrument into the NORMAL OPERATION substate Returns the currently assigned VME interrupter line Returns the number of interrupters supported The VXOA41 supports only one interrupter Returns the capabilities of the instrument to the Commander This word always has the value OxFE23 Reports the most recent word serial protocol error code to the commander Returns the value of the status byte This command is analogous to a serial poll on the GPIB refer to the section Status and Events Puts the instrument into the locked state the Locked bit of the response register is cleared This command causes the attenuator to change its attenuation setting by the current increment amount if the increment is nonzero See ATTenuate INCRe ment and ATTenuate NEXT in the Commands section VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com HERE AEN Appendix D Using the OPC Query Command When you are using the VXOA41 in an automated test environment it 15 important that you be aware of the finite times for certain commands to complete For example suppose you develop an automated test in which the attenuator is adjusted over the VXI bus via the ATT DB n command After each adjustment by the attenuator you might then take a reading from an optical power meter such as the Tek
67. ing respectively Singlemode Fiber An optical fiber with a narrow core that supports the transmission of only one mode of light through the fiber VXOAAI Optical Attenuator User Manual Glossary 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Glossary Glossary 2 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Index A Abbreviating Command 3 4 Accessories Optional A 1 A 2 Standard 1 address switches 1 3 ADJusting command 3 11 3 12 ALLev command 3 12 3 21 Argument Command 3 2 ASCII 3 1 Character table C 2 ATTenuation command 3 13 ATTen DB 3 13 ATTen DBR 3 13 ATTen MINimum 3 13 ATTenuation INCRement command 3 14 ATTenuation NEXT command 3 14 3 15 ATTenuation TPOLarity command 3 16 ATTenuation TRIGger command 3 15 backplane jumpers 1 2 Block Command argument 3 5 BLRN command 3 16 3 17 BNF Backus Naur form 3 1 Break 3 1 Buffer Glossary 1 C CAL command 3 17 CAUTION statement in manuals v statement on equipment v Cautions fuses vi grounding the VXOA41 vi operating in explosive atmospheres vi power cord vi power source vi removing panels or covers vi checkout procedure ID IDN query 1 6 Cladding Glossary 1 Clear Status 3 17 3 18 CLS command 3 17 3 18 Command CAL 3 17 VXOAA Optical
68. it 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 The following options are available for the VXOA41 Option 1 changes the optical input and output ports to accept 50 um multimode fiber utilizing FC PC connections Option 2 changes the optical input and output ports to accept 62 5 um multimode fiber utilizing FC PC connections Option 3 changes the optical input and output ports to accept 100 um multimode fiber utilizing FC PC connections VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com _ Appendix B Specifications The performance characteristics described in this appendix Tables B 1 through 3 are valid under the following conditions m The instrument must have been calibrated at an ambient temperature between 4209 C and 430 m The instrument must have had a warm up period of at least 20 minutes m 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 see Appendix A m Both input and output connectors have been cleaned as described on page F 1 Table B 1 Optical Characteristics
69. level of the Power Meter this value should be 20 00 dB 0 15 dB relative to the previously set 0 dB reference level when the VXOA41 was at MIN setting m Record the exact relative dB reading this will be used as a comparison for repeatability Adjust the attenuation to minimum attenuation by sending the command ATT MIN to the VXOA41 m The Power Meter should read within 0 05 dB of 0 00 dB this verification assumes that the source has not drifted 0 005 dB change and the fiber jumper cables have not been disturbed Adjust the attenuation to 10 00 dB by sending the command ATT DB 10 to the VXOAAI m The Power Meter should read within 0 05 dB of the reading taken in step 5 this verification assumes that the source has not drifted 0 005 dB change and the fiber jumper cables have not been disturbed Adjust the attenuation to 20 00 dB by sending the command ATT DB 20 to the VXOAAI VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification m The Power Meter should read within 0 05 dB of the reading taken in step 7 this verification assumes that the source has not drifted 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
70. mmands Syntax WAVelength Related Commands VERBOSE ON OFF NRf VERBOSE ON or NRf 0 sets the Verbose Header State TRUE which returns full length headers for applicable setting queries OFF or NRf 0 sets the Verbose Header State FALSE which returns minimum length headers for applicable setting queries VERBOSE ON Sets the Verbose Header State TRUE VERBOSE Might return the value 1 showing that the Verbose Header State is TRUE The WAI Wait command prevents the VXOA41 from executing further commands or queries until all pending operations finish OPC ADJusting WAI This commands set or queries the wavelength used by the instrument when determining the equivalent attenuator positioning for a given attenuation N A VXOAAI Optical Attenuator User Manual 3 33 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax WAVelength NRf WAVelength Arguments The valid range for the wavelength argument is 600 nm to 1700 nm Default units are always nanometers with N for nano or 1E 09 and U for micro or 1 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 WAVELENGTH 1300 WAV 1300 Sets the wavelength to 1300 nm WAV 1300NM Sets the wavelength t
71. nt for example ATTen the response is the same as that for an ATTen DB DBR query Examples ATT DB Would return the string ATTEN DB lt present setting absolute gt ATT DBR Would return the string ATTEN DBR lt present setting minus REF gt ATT MIN Would return the string ATTEN MIN lt 1 if at min 0 otherwise VXOAAI Optical Attenuator User Manual 3 13 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands ATTenuation INCRement Related Commands Syntax Arguments Examples ATTenuation NEXT Related Commands 3 14 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 NOTE Attenuation can be changed even if the light shutter is closed ATTenuation NEXT ATTen INCRement lt NR2 gt ATTen INCRement The argument has range of 60 to 60 The minimum increment is 0 1 Setting the increment to 0 01 value 0 01 disables the auto increment feature ATT INCR Would return the string ATTEN INCR present setting absolute ATT INCR 5 0 Sets the auto increment value to 5 0 dB ATTenuation NEXT causes the VXOA41 to change the c
72. o 1300 nm WAV 1 3UM Sets the wavelength to 1300 nm WAV 1300 0E 09M Sets the wavelength to 1300 nm 3 34 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com P an Status and Events Registers Status Registers The VXOA41 provides a status and event reporting system for the programming interface This system informs you of certain significant events that occur within the VXOAAI The VXOA41 status handling system consists of five 8 bit registers and two queues This section describes these registers and components and explains how the event handling system operates The registers in the event handling system fall into two functional groups The Standard Event Status Register SESR and the Status Byte Register SBR contain information about the status of the VXOA41 These registers are therefore called the Status Registers m The Device Event Status Enable Register DESER the Event Status Enable Register ESER and the Service Request Enable Register SRER determine whether selected types of events are reported to the Status Registers and the Event Queue These three registers are called the Enable Registers 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 an
73. or a complete discussion of the use of these registers and the output queue see page 3 35 Related Commands ADJusting Syntax X OPC OPC cm OPT Query Only The OPT Option Identification Query command returns a string that identifies what options are installed in VXOA41 Related Commands N A Syntax OPT 7 Returns The command returns a single 0 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 Since the options are mutually exclusive two of the fields will always be 0 One of the fields which one depends on what option is installed will indicate the installed option with the syntax OPTION 1 2 3 fiber core size in microns um multimode fiber Examples OPT Might return the string 0 0 0PTION 3 100um multimode fiber 3 26 VXOAAI Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands PSC Related Commands Syntax Arguments Examples The PSC Power On Status Clear command sets and queries the power on status flag that controls the automatic power on handling of the DESER SRER and ESER registers When PSC is TRUE the DESER register is set to 255 and the SRER and ESE
74. ou can further control whether the returned headers are abbreviated or are full length The Verbose command lets you control this You can concatenate any combination of set commands and queries using a semicolon The VXOA41 executes concatenated commands in the order received Concatenating commands is useful when you want to avoid events generated by conflicting settings see Conflicts on page 3 40 When concatenating commands and queries you must follow these rules 1 Completely different headers must be separated by both a semicolon and by the beginning colon on all commands but the first For example the commands ATT DB 15 and DISABLE OFF would be concatenated into a single command ATT DB 15 DIS OFF 2 Never precede a star command with a colon ATT DB 10 OPC 3 When you concatenate queries the responses to all the queries are concate nated into a single response message For example if the disable mode is OFF and the attenuator is 20 dB the concatenated query DIS ATT DB will return either DIS 0 ATT DB 20 if HEADER is set to ON or 0520 if HEADER is set to OFF 4 Setcommands and queries may be concatenated in the same message For example ATT DB 15 DIS ON DIS ADJ is a valid message that sets the attenuation to 15 dB the disable mode to ON and responds with the disable status and the adjusting status Concate nated commands and queries are executed in the order received Here are some invalid
75. peatability and Accuracy Procedure G 11 VXOAAI Replaceable Parts H 4 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents List of Tables Table 1 1 VXOA41 Module Power Requirements 1 2 Table 3 1 BNF Symbols and Meanings 3 1 Table 3 2 Command Message Elements 3 2 Table 3 3 Comparison of Header and Off Responses 3 3 Table 3 4 Block Argument Elements 3 5 Table 3 5 Numeric Argument Descriptions 3 6 Table 3 6 Commands Common to GPIB Devices and Supported by the VXOAMI oi x pasasha hr esr ES 3 10 Table 3 7 VXOA41 Device Commands and Parameters 3 11 Table 3 8 FACTory Default Settings 3 23 Table 3 9 Results from TST 3 32 Table 3 10 SESR Bit Functions 3 36 Table 3 11 SBR Bit Functions 3 37 Table 3 12 No Event Messages 3 41 Table 3 13 Command Error Messages CME Bit 5 3 41 Table 3 14 Execution Error Messages EXE Bit4 3 42 Table 3 15 Device Error Messages DDE Bit3 3 43 Table 3 16 System Event Messages QYE Bit2 3 43 Table 3 17 Execution Warning Messages EXE Bi
76. pectral response in one unit m Linear response within 0 05 dB m Ability to store attenuation levels which is useful for repeat measurements m Versions available for both single and multimode fiber m VXI double wide C size module with message based interface The VXOA41 is a message based VXI module Control communications are provided at two levels low level word serial commands and ASCII commands Low level word serial commands provide system administration services Word serial commands are used by the VXI Resource Manager to determine system status allocate resources and initiate normal system operation These commands are not normally accessed by the system user The ASCII command set is used for instrument control and communication The commands use IEEE Std 488 2 style syntax Word serial protocol transports these communications between the system controller or slot 0 if the system controller is not included in the VXI mainframe and the instrument module Before operating the VXOAA1 for the first time you must perform the following steps 1 Verify that you have met the power and cooling requirements for the VXI mainframe with the VXOA41 installed NOTE There is a label located on the right side shield that lists the power and cooling requirements 2 Verify that the backplane jumpers have been properly set up for the desired slot in the mainframe if necessary refer to the installation instructions later in this
77. r Wrap the VXOA41 with polyethelene sheeting or equivalent material to protect the finish Cushion the VXOA41 in the shipping carton by tightly packing dunnage or urethane foam on all sides between the carton and the VXOA41 Allow 7 5 cm 3 in on all sides top and bottom Seal the shipping carton with shipping tape or an industrial stapler VXOAAI Optical Attenuator User Manual E 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix E Packing for Shipment E 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com UU Appendix F Maintenance This appendix describes how to perform routine maintenance on the 41 Optical Attenuator There are no user serviceable parts in the 41 Should your instrument need service contact your nearest Tektronix service representa tive The following maintenance procedures are discussed in this chapter m Cleaning the Optical Ports m Changing the Optical Port Connectors Cleaning the Optical Ports If the VXOA41 performance appears degraded the optical fiber and optical port may be dirty 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 Usea Phillips screwdriver to remove the four scre
78. r is for the signal input the lower connector is for the attenuated output signal NOTE See Appendix F for instructions on how to change the optical connectors to another style such as ST or DIN 47256 WARNING 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 VXOAA Optical Attenuator User Manual 2 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Operating Basics Tektronix VXOAAI OPTICAL ATTENUATOR CJ C CJ CJ READY ACCESSED ADJ MIN ATT DISABLE OPTICAL IN Figure 2 1 VXOA41 Front Panel Option 1 Shown VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com w ww eee Reference Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com w ws lt nr 0 a i l Command Syntax You can control the VXOA41 using a large group of commands and queries This section describes the syntax these commands and queri
79. rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started Checkout Procedure Once you have installed the VXOA41 in a VXI mainframe you can communi cate with it as with any other VXI module You do not need any special software installed However because you are working in a VXI environment this procedure assumes that you have the capability to communicate with the VXOAAT 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 this LED verifies that the power up diagnostics have passed 2 After the diagnostics have passed you can verify that the VKOA41 communicates with a controller or commander by issuing IDN to the 41 and reading the results If the VXOA41 properly responds to ID or IDN you have verified the communications with the module on the VXI bus In general the VXOA41 should respond to an ID as follows TEKTRONIX VXOA41 BO1OXXX CF 91 1 CN RM 1 1 1 6 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com HU 8 Operating Basics Artisan Technology Group Quality Instrumentation Gu
80. rts of the VXOA41 are potential shock hazards This includes knobs and controls that may appear to be insulators Use only the power cord and connector specified for your VXI mainframe Use only a power cord that is in good condition To avoid fire hazard use only the fuse specified in the parts list for your VXI mainframe and that is identical in type voltage rating and current rating To avoid personal injury do not operate the VXOA41 or VXI mainframe without the panels or covers The VXOA41 provides no explosion protection from static discharges or arcing components Do not operate the VXOA41 in an atmosphere of explosive gasses VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started First Time Operation Congratulations on your purchase of a VXOA41 Optical Attenuator The VXOAA Optical Attenuator is a high performance instrument used to attenuate optical signals Some of the outstanding characteristics of the VXOAAT are m Attenuation to 60 dB the VXOAAI can attenuate signals up to 60 dB in steps of 0 01 dB A shutter provides greater than 100 dB attenuation m 600 nm to 1700 nm calibrated s
81. s non zero m The MIN ATT red LED should be lighted Send the command ATT DB 10 this causes the instrument to adjust to 10 dB a few seconds may be needed to complete the adjustment m The ATT ADJ red LED should be lighted for a brief moment a second or two while the attenuation is being adjusted This LED will always light up during attenuation adjustments and after wavelength adjust ments after adjustments are complete the LED should return to an OFF state unlighted Send the command ATT MIN this causes the instrument to return to the minimum attenuation Send the query ATT DB the response should read ATTENUATION DB 0 00 Send the command DIS 1 this causes the instrument to adjust to place the shutter across the optical path for maximum attenuation m The DISABLE red LED should be lighted Send the command DIS 0 this will withdraw the shutter so that it is no longer blocking the optical path m The DISABLE red LED should be off unlighted VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification Shutter Attenuation and Disable 1 Sendthe command DIS 1 this causes the instrument to place the shutter across the optical path for maximum attenuation VXOA41 Optical Source Optical Power Meter Figure G 1 Setup for Shutter Attenuation
82. s that the VX0A41 requests service from the controller 6 MSS Master Status Summary obtained from STB query Summarizes the ESB and MAV bits in the SBR 5 ESB Event Status Bit Shows that status is enabled and presentin the SESR 4 MAV Message Available Shows that output is available in the Output 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 DESER ESER and SRER allow you to select which events are reported to the Status Registers and the Event Queue Each Enable Register acts as a filter to a Status Register the DESER also acts as a filter to the Event Queue and can prevent information from being recorded in the register or queue Each bit in an Enable Register corresponds to a bit in the Status Register it controls In order for an event to be reported to its bit in the Status Register the corresponding bit in the Enable Register must be set to 1 If the bit in the Enable Register is set to 0 the event is not recorded The next section describes the Enable Registers and the commands used to set them The Device Event Status Enable Register DESER Figure 3 6 shows the DESER This DESER controls which types of events are reported to the SESR and the Event Queue The bits in the DESER correspond to those in the SESR as described earlier Use the DESE command to enable and di
83. s the VXOA41 to place the shutter across the optical path for maximum attenuation 10 Record the new reading of the Optical Power Meter as Py if the dB relative mode is available then record the new reading s value relative to the Po 0 dB reference If Pris lt 0 00 substitute 1 10 14 W for Pr If the Relative dB mode is not available the relative dB is calculated as Relative Attenuation with shuttler blocking light dB 10 x log P 0 m The Relative Attenuation should be 2100 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 gt 90 dB lower NOTE Most Optical Power Meters cannot accurately measure at such low power levels consequently the meter may simply display the lowest value it possibly can when the shutter is activated To verify the gt 100 dB isolation of the shutter an Optical Power Meter with greater than 100 dBm sensitivity must be used VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification Insertion Loss Long Wavelengths 1 Send the command DIS 1 this causes the VXOAAI to place the shutter across the optical path for maximum attenuation 2 Properly zero the Average Optical Power Meter to be used 3 Sendthe command DIS 0 this withdraws the shutter from the optical
84. sable the bits in the DESER Use the DESE query to read the DESER Figure 3 6 The Device Event Status Enable Register DESER VXOAAI Optical Attenuator User Manual 3 37 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Status and Events The Enable Registers and the PSC Command 3 38 The Event Status Enable Register ESER Figure 3 7 shows the ESER The ESER controls which types of events are summarized by the Event Status Bit ESB in the SBR Use the ESE command to set the bits in the ESER and use the ESE query to read it 7 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE ROC OPC Figure 3 7 The Event Status Enable Register ESER The Service Request Enable Register SRER Figure 3 8 shows the SRER The SRER controls which bits in the SBR generate a Service Request and are summarized by the Master Status Summary MSS bit Use the SRE command to set the SRER Use the SRE query to read it The RQS bit remains set to one until either the Status Byte Register is read with a Read STB word serial command or the MSS bit changes back to a zero 1 5 4 3 2 1 ESB MAV Figure 3 8 The Service Request Enable Register SRER The PSC command controls the contents of the Enable Registers at power on Sending PSC 1 sets the Enable Registers at power on as follows m DESER 255 equivalent to a DESe 255 command m ESER 0 equivalent to an ESE 0
85. sonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair 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 Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service 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 Customer if the shipment is to a location within the country in which the Tektronix service center is located 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
86. t 4 3 44 Table B 1 Optical Characteristics B 1 Table B 2 Physical Characteristics B 2 Table B3 Environmental Performance B 2 Table B 4 Certifications and Compliances B 3 Table C 1 The ASCII Character Set C 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Safety Summary Symbols and Terms AN AN 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 These two terms appear in manuals CAUTION Caution statements identify conditions or practices that could result in damage to the equipment or other property WARNING Warning statements identify conditions or practices that could result in personal injury or loss of life These two terms appear on equipment m CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself m DANGER indicates a personal injury hazard immediately accessible as one reads the marking This symbol appears in manuals Static Sensitive Devices
87. t number 070 8777 00 is this manual Optional Accessories The optional accessories appropriate for your instrument depend on which option was installed on your VXOA41 at the time of purchase Optical Cables Single Mode 2 meter 8 125 micron m FC PC to Diamond 2 5 Tektronix part number 174 1497 00 m FC PC to Diamond 3 5 Tektronix part number 174 1385 00 m FC PC to ST Tektronix part number 174 1386 00 m FC PC to FC PC Tektronix part number 174 1387 00 m FC PC to Biconic Tektronix part number 174 1388 00 Optical Cables Multimode 2 meter 62 5 140 micron m FC PC to Biconic Tektronix part number 174 2323 00 m FC PC to SMA906 Tektronix part number 174 2324 00 m FC PC to FC PC Tektronix part number 174 2322 00 Optical Cables Multimode 2 meter 100 140 micron NOTE At the time of publication the 100 um cables listed below do not utilize physical contact connectors m FC to SMA Tektronix part number 174 0878 00 m ST to SMA Tektronix part number 174 0876 00 VXOA41 Optical Attenuator User Manual A 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix A Accessories and Options Options Option 1 50 Micron Multimode Fiber Option 2 62 5 Micron Multimode Fiber Option 3 100 Micron Multimode Fiber A 2 m Diamond 2 5 to SMA Tektronix part number 174 1303 00 Optical Connector Kit m Universal optical input and output connector k
88. t the power meter s wavelength is set to match the wavelength of the source 4 Record the power reading from the Optical Power Meter as Pshort1 m Jfa relative dB mode is available on the Power Meter set the dB reference level of the Power Meter to the measured Pshort1 value VXOAA Optical Attenuator User Manual G 9 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification VXOA41 Optical Source Optical Power Meter 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 7 Ensure that the VXOA41 is set to the minimum attenuation setting this can be accomplished by sending the command ATT MIN to the VXOA41 check to see that MIN ATT LED is lighted 8 Record the new reading of the Optical Power Meter as Pshort2 if the dB relative mode is available then record the new reading s value relative to the Pshort1 0 dB reference If the Relative dB mode is not available the relative dB Insertion Loss is calculated as Pshort2 Short Wavelength Insertion Loss dB 10 X log Pshortl m Therelative level of Pshort2 to Pshort1 should be greater than 4 0 dB that 15 less than 4 0 d
89. t where you intend to install the module has the Bus Grant BG0 BG2 and Interrupt Acknowledge IACK jumpers properly installed for the mainframe slot The VXI mainframes contain daisy chain jumpers for these signals The jumpers must be configured for the VXOA41 so that the slot is not bypassed The VXOA41 is a 2 wide VXI slot instrument The left slot will pass on daisy chained IACK signals to the right but the right slot of the VXOA41 will VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Getting Started not pass IACK signals because it does not connect to the backplane Thus the mainframe slot that accepts the right side of the VXOA41 must have jumpers installed to pass on IACK signals Installing the VXOA41 ina Use the following procedures to install the VXOA41 into a Tektronix main VXI Mainframe frame If you use the VXOA41 with another mainframe you may have to modify this procedure damage Observe standard handling precautions for static sensitive devices Always wear a grounded wrist strap or equivalent while installing or removing the 41 CAUTION Some components on the VXOA41 are susceptible to static discharge 1 The VXOAAI 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 Set
90. 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 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 IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR 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 INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com rtisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents List Of Figures o m n Rh rt her eetis istes iii List oP Tables 25 5 eoe ees testet n mea Hine E iv Safety Summary n
91. tion settings You can also have the OPC bit of the SESR set by using the command form of OPC instead of the query form By setting the OPC bit to 1 via an OPC command an event will be generated assuming the user has enabled the proper register bits W Advanced programmers can develop other methods to accomplish the set and wait until complete routine utilizing the event queues and status registers provided in the VXOA41 VXOAA Optical Attenuator User Manual D 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix D Using the OPC Query Command D 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com aw ii Appendix E Packing for Shipment If you ship the VXOA41 pack it in the original shipping carton and packing material If the original packing material is not available package the instrument as follows 1 Obtain a corrugated cardboard shipping carton with inside dimensions at least 15 cm 6 in taller wider and deeper than the VXOA41 The shipping carton must be constructed of cardboard with 375 pound test strength If you are shipping the 41 to a Tektronix field office for repair attach tag to the VXOAAT showing the instrument owner and address the name of the person to contact about the instrument the instrument type and the serial numbe
92. to input of VXOAAT option 3 and one 100 um core or greater for output of VXOA41 option 3 to the Optical Power Meter note 62 5 um is the largest fiber core allowed for accurate use with the Tektronix OCP Power Meter The 100 um fiber used for input to the VXOA41 option 3 can be replaced by a singlemode fiber if the stable source to be used is designed to couple light into a singlemode fiber A 50 um fiber or even a 62 5 um fiber can be used with a stable source designed to couple into a singlemode fiber G 2 VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix G Performance Verification Power Up Front Panel LEDs 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 Please refer to the Product Verification Data sheet accompanying the VXOA41 at shipment for a more complete listing of the instrument s performance as shipped from the factory 1 Insert the VXOAAI into a powered down V XI Mainframe see Installation in the Getting Started section m Make certain that the VXOAALT is securely inserted into the mainframe 2 Turn the
93. tronix OCP 5502 In such a sequence it is important that you not initiate the reading from the optical power meter before the VXOAA has completed all adjustments and has come to a stable position that is the ATT ADJ indicator is no longer illuminated 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 VXOAAT s pending operations have completed Example A command is sent to the VXOA41 to change attenuation to 45 dB the command is immediately followed by an OPC query to the same VXOAAI 1 Write to the VXOA41 V XI address ATT DB 45 00 OPC 2 Read from VXOAAI the VXI address 1 Depending on the previous attenuation setting of the VXOA41 several seconds may be required before the ATT DB command is completed and the OPC produces a 1 in the VXOA41 output queue After the OPC query is sent to the VXOAAI the programmer should immediately attempt a read instruction from the controller The programmer s controller should wait until the VXOA41 finishes all adjustments and the OPC query provides a 1 to be read NOTE It is important that you remember to set the time out of the controller 5 READ instruction to be greater than the longest time possible for the VXOA41 to make any adjustments up to five seconds may be required to make large changes to attenua
94. turn the response BLRN 222 22 bytes of binary data CAL Query Only This command query returns a number that denotes the calibration status of the VXOAAI If the CAL query returns 0 then calibration is OK If a non zero value 15 returned the unit needs to be returned to Tektronix for calibration Related Commands TST Syntax CAL CO Examples CAL Wil normally return 0 CLS No Query Form The CLS Clear Status command clears the VXOA41 status data structures 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 DESE ESE ESR EVENT EVMSG SRE STB Syntax CLS The CLS command clears the Event Queue VXOAA Optical Attenuator User Manual 3 17 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands DESE Related Commands Syntax Arguments 3 18 W he Standard Event Status Register SESR m the Status Byte Register except the MAV bit see below If the CLS command immediately follows lt 0 gt the output queue and bit Status Byte Register bit 4 are also cleared indicates informa tion is in the output queue DCL will clear the output queue and thus MAV CLS does not clear the output queue or
95. type of the VXOA41 m Wavelength of 1300 120 nm or 1550 120 nm for testing VXOA41 standard module m Wavelength of 850 20 nm or 1300 20 nm or 1550 120 nm for testing VXOAALT option 1 option 2 or option 3 m Fiber optic jumper cables which vary depending on the specific VXOA41 in use m For a standard VXOA41 two 9 um core singlemode jumpers m Fora VXOA4 1 option 1 One 50 um core multimode fiber from source to input of the VXOA41 option 1 and one 50 um core or greater for output of VXOA41 option 1 to the Optical Power Meter note 62 5 um is largest fiber core allowed for accurate use with the Tektronix OCP Power Meter The 50 um fiber used for input to the VXOA41 option 1 can be replaced by a singlemode fiber if the stable source to be used is designed to couple light into a singlemode fiber m Fora VXOAALT option 2 One 62 5 um core multimode fiber from the source to the input of VXOA41 option 2 and one 62 5 un core or greater for the output of the VXOA41 to the Optical Power Meter note since 62 5 um is largest fiber core allowed for accurate use with the Tektronix OCP Power Meter the OCP should not be used with the 100 um VXOA41 option 3 The 62 5 um fiber used for input to the VXOA41 option 2 can be replaced by a singlemode fiber if the stable source to be used is designed to couple light into a singlemode fiber a singlemode 50 um fiber can also be used m For VXOAA option 3 one 100 um core multimode fiber from source
96. urrent attenuation setting by the current auto increment value NOTE Attenuation can be changed even if the light shutter is closed ATTenuation INCRement VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Commands Syntax ATTen NEXT ATTenuation TRIGger The ATTenuation TRIGger command controls the usage of a VXI TTL trigger line in monitoring the attenuator adjusting status When a trigger line is selected the associated trigger line will be asserted or unasserted when the attenuator is busy adjusting attenuation is not stable The polarity of the trigger signal is determined by the ATTenuation TPOLarity command The desired TTL trigger line is specified as TTLTRGO through TTLTRG7 To disable the TTL trigger line usage use the command ATTenuation TRIGger NONE Related Commands ATTenuation TPOLarity Syntax ATTen TRIGger TTLTRG lt NR1 gt NONE ATTen TRIGger m j Gmm Arguments The numeric argument has a range of 0 to 7 That is TTLTRG NR 1 can take on the values TTLTRGO TTLTRG1 TTLTRG7 Note that there is no space between TTLTRG and the numeric argument Examples ATT TRIG TTLTRG1 Specifies that the line TTLTRGI will be used to monitor attenuator adjusting status ATT TRIG NONE Disables the TTL trigger line usage ATT TRIG Might return the string ATT
97. which is defined below lt NZDig gt A non zero digit character in the range 1 9 lt Dig gt A digit character in the range 0 9 lt DChar gt A character with the binary equivalent of 0 through FF hexadecimal 0 through 255 decimal The block argument is in the following format Block lt NZDig gt lt Dig gt lt Dig gt lt DChar gt NZDi g gt specifies the number of Dig elements that follow Taken together the Dig elements form a decimal integer that specifies how many lt DChar gt elements follow See Figure 3 2 VXOAAI Optical Attenuator User Manual 3 5 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Command Syntax Numeric Arguments 3 6 Block Argument BLRN 222 binary data 22 bytes Block Header Specifies Data Length Specifies Number of Length Digits that Follow Figure 3 2 Block Argument Example The block argument can also take the following format Block 0 lt DChar gt EOI Under IEEE Std 488 2 the above format is also a valid form for block arguments 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 Many VXOA41 commands require numeric arguments Descriptions of these arguments are given in Table 3 5 Table 3 5 Numeri
98. ws that secure the bulkhead connector to the front panel see Figure F 1 3 Gently pull the bulkhead out of the unit and unscrew the fiber connector Be careful not to pull beyond the fiber slack If there is insufficient slack or if you accidently push the disconnected fiber back into the instrument then perform the following three steps a Remove the screws that secure the side cover and remove the side cover See Figure F 1 b You will now have access to the optical fiber Unscrew it from the bulkhead if necessary or push it back through the front panel c Reinstall the cover when finished 4 Using a soft lint free cloth with a high quality glass cleaner clean the tip of the fiber cable 5 If available use low pressure compressed air or canned air to blow any dirt out of the bulkhead connector If compressed air is not available then the bulkhead will have to be taken apart and cleaned Refer to the Changing the Optical Port Connectors procedure on page F 2 for information about bulkhead disassembly VXOAAI Optical Attenuator User Manual F 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Appendix F Maintenance 6 After cleaning the bulkhead reconnect the fiber and install the bulkhead Be sure to reinstall the dust cover chain NOTE To keep cleaning to a minimum install the dust cover when no fiber is connected to the optical port Opti
99. x D Using the OPC Query Command D 1 Appendix E Packing for Shipment E 1 Appendix F Maintenance F 1 Cleaning the Optical Ports 1 Changing the Optical Port Connectors F 2 Appendix G Performance G 1 Equipment List pers coin 9 eR PE puqusqa awa G 1 Power Up ss e Rd CREE BEER amu e Rd EYE G 3 Front Panel LEDS u pede ned eek he de asua PEG de ES G 3 Shutter Attenuation and Disable G 5 Insertion Loss Long Wavelengths G 7 Insertion Loss Short Wavelengths G 9 Repeatability and Accuracy G 11 Appendix H Replaceable Parts H 1 Parts Ordering Information H 1 Using the Replaceable Parts 186 H 1 Glossary and Index ii VXOAA Optical Attenuator User Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Table of Contents List of Figures Figure 1 1 Figure 1 2 Figure 2 1 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure

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