VOA5 Variable Fiber Optic Attenuator User's Guide
Contents
1. 0 nm Return Loss min 20 dB Display Resolution 0 1 dB Accuracy 25 C 0 20 dB typical 0 4dB max 0 dB to 30 dB 0 3 dB typical 0 6 dB max 30 dB to 60 dB 28 Repeatability 25 C 0 25 dB Maximum Input Level 24 dBm General Specifications VOA5 MM Battery Life alkaline 10 hrs Speed 0 30dB in less than 5 seconds Power 2 AA alkaline 120 220 AC adapter or NiMH battery pack optional Size H x W X D 18 5 x 11 1 x 4 6 cm 7 3 x 4 4 x 1 8 in Weight 0 55 kg 1 22 Ib Operating Temperature 0 to 50 C Storage Temperature 20 to 60 C Relative Humidity 0 to 90 non condensing Available Connectors SC UPC FC UPC ST UPC Repeatability is defined as the mean plus one standard deviation typical value 29 30 P AFL Telecommunications A Fujikura Business Thank you for choosing Noyes Test amp Inspection 16 Eastgate Park Road Belmont NH 03220 Phone 800 321 5298 603 528 7780 Fax 603 528 2025 CERTIFIED www AFLtele com go Noyes ah l NOYES Test amp Inspection A Division of AFLTelecommunications2. P AFL Telecommunications A Fujikura Business VOA5 Variable Fiber Optic Attenuator User s Guide ahs a N NOYES 7 Test amp Inspection A Division of AFLTelecommunications fP AFL Telecommunications A Fujikura Business VOA5 Variable Fiber Optic Attenuator User s Guide ah l N NOYES 7 Test amp Inspection A Division of AFLTelecommunications 2002 2010 AFL Telecommunications all rights reserved VOA5 00 1000 Revision E 2010 02 12 Specifications are subject to change without notice Limited Warranty One Year Limited Warranty All Noyes products are warranted against defective material and workmanship for a period of one year from the date of shipment to the original customer Any product found to be defective within the warranty period will be repaired or replaced by Noyes In no case will Noyes liabilities exceed the original purchase price of the product Exclusions The warranty on your equipment shall not apply to defects resulting from the following e Unauthorized repair or modification e Misuse negligence or accident CE Information These instruments have been C designed and tested to comply with the relevant sections of any applicable specifications including full compliance with all essential requirements of all applicable EU Directives Returning Equipment To return equipment please contact Noyes to obtain additional information and a Service Request S R number To a
3. S to the desired test wavelength 2 Connect the OPM and OLS using the appropriate jumper jumper cable 1 cable 3 Make sure your OPM displays loss in dB 4 Use the Set Reference function on your power meter i e zero OLS OPM the power meter Note On most Noyes optical power meters press and hold the SET REF key for several seconds until the unit indicates that a new reference value has been entered 5 Insert the VOA5 and jumper cable 2 between the OLS and OPM Note Do not disconnect jumper cable 1 from the OLS 6 Press the ZERO key to set attenuation to its minimum value The loss value in dB now displayed on your OPM is the CAL factor of your test setup 7 Hold the CAL key for approximately three seconds to display the CAL ADJUST screen 8 Use the Arrow keys to set CAL to the value displayed on your OPM 9 Press the CAL key to exit the CAL ADJUST screen Note that the displayed attenuation value will equal CAL when the VOAS is set to its cable 1 l cable 2 minimum attenuation value OLS VOAS OPM Section 3 Applications This section describes the operation of the VOA5 in two applications as a field instrument testing optical margin and as a lab instrument measuring an optical system operating limits under local and remote control Measuring Optical System Operating Limits Local Control Once you have set th
4. Transmitter Receiver requirements Then reduce attenuation until the system just meets requirements jumper cable 1 jumper cable 2 Note Ignore the attenuation value displayed by your VOA5 because the correct CAL factor has not been entered VOAS 7 Disconnect jumper cable 2 from the optical 14 receiver and connect it to the OPM to measure the power with the added attenuation Call this power level P2 8 Calculate optical margin P1 P2 For example if P1 30 dBm and P2 35 dBm then optical margin equals 30 35 5 dB 9 On dual fiber systems repeat the above procedure in the other direction of transmission Section 4 Remote Commands and Error Codes The following general information is provided to develop a control program to automate the operation of your VOA5 Programming the Attenuator The interface used by the VOA5 is RS 232 This is the interface used for communications between a personal computer and the VOA5 Use the following RS 232 settings to communicate with the VOAS 15 Baud Rate 9600 bps Data Bits 8 Parity none Stop Bits 1 Flow Control none The VOA5 RS 232 interface is configured as Data Communications Equipment A one to one 9 pin serial cable is recommended for communication between a personal computer and the VOA5 A null modem is not required for communication between a personal computer and the VOA5 For more information regarding RS 232 comm
5. a Command INP VER Syntax INP VER Description The version number query commands the instrument to return its firmware version number Example INP VER 1 004 20 Command INP ATT Syntax INP ATT lt VALUE gt Description This command sets the attenuation at the current wavelength to lt VALUE gt dB Data Range VOA5 MM min CAL See INP OFFS command VOA5 MM max 30 0 CAL See INP OFFS command Example INP ATT 42 6 A Command INP ATT Syntax INP ATT Description The attenuation value query commands the instrument to return its current attenuation value Example INP ATT 42 64 21 Command INP WAV Syntax INP WAV VALUE Description This command sets the wavelength to lt VALUE gt nm Data Range VOA5 MM 850 1300 Example INP WAV 1550 A Command INP WAV Syntax INP WAV Description The wavelength query commands the instrument to return the current wavelength Example INP WAV 15504 22 Command INP OFFS Syntax INP OFFS VALUE Description This command sets the insertion loss CAL to lt VALUE gt dB Data Range VOA5 MM min 0 0 VOA5 MM max 39 9 Example INP OFFS 1 5 A Command INP OFFS Syntax INP OFFS Description The insertion loss CAL query commands the instrument to return the current insertion loss CAL Example INP OFFS 1 54 23 Command VOA HOME Syntax INP HOME Descri
6. e calibration CAL factor you can use your VOA5 to determine the operating limits of an optical transmission system Operating limits are the minimum and maximum optical span loss values at which your optical system still meets its performance requirements for example a given bit error ratio BER 1 Set the calibration CAL factor refer to section Setting the calibration CAL factor NOTE Do not disconnect jumper cables from the VOA5 2 Set VOA5 attenuation to the approximate mid range optical span loss value for your optical system For example if your system is designed to operate over optical spans with 10 to 50 dB of loss set VOA5 attenuation to about 30 dB 3 Connect the free end of jumper cable 1 to the output or your transmitter and the free end of jumper cable 2 to the input of your receiver 4 Verify that your optical system is operating normally 5 To measure maximum attenuation increase VOA5 attenuation until your optical system fails to meet performance requirements Then decrease attenuation until system performance just meets requirements The attenuation value displayed by the VOA5 equals the maximum attenuation limit 6 To measure minimum attenuation decrease VOAS attenuation to the minimum span loss Transmitter Receiver specified by the optical system manufacturer to prevent damage to your receiver do not decrease attenuation below this value or until your optical system fails to meet performance re
7. g shipment If you find any damage or if any of the following items are not included please contact Noyes The VOAS unit is shipped with protective rubber boot 2 AA batteries warranty registration card user s guide and carry case Feature Overview The VOA5 MM multimode are handheld rugged variable optical attenuators suited for a wide range of fiber link certification and production test applications The VOA5 offers high bi directional return loss and will maintain the set attenuation level when the unit is powered down Recommended Accessories You will need fiber optic test jumpers to connect the VOA5 to the system under test Test jumpers must have the same core and cladding size as the fiber under test Test jumpers require the appropriate connectors on each end to interface the system s connectors and the output and input connectors on the VOA5 Test jumpers with a variety of lengths and connector styles are available from Noyes An optical quality cleaning fluid such as AFL FCC2 connector cleaning fluid and AFL CCT molded cleaning tips is recommended for cleaning connector end faces on VOA5 and test jumpers Section 2 Functional Description VOA5 Ports and Keys 1 Input Output port The optical input output port is used to connect the VOAS to the receiver or transmitter end of the system under test Display The upper section of the display shows the current operational mode of the VOA5 The middle section displa
8. he FCC2 to fill the well Dip the CCTP tip into the well of the FCC2 to dampen the tip with optical cleaning fluid Place the damp tip over the ferrule to be cleaned Rotate the tip clockwise 10 revolutions while applying varying pressure to create a gentle pumping action where the tip contacts the ferrule e Discard the CCTP stick after using both tips If using lint free optical cleaning pads and isopropyl alcohol e Be sure to use 99 IPA that has not been contaminated e Dampen the wipe with the alcohol and gently wipe the exposed ferrule Then dry the ferrule using a new optical wipe 4 Once completed replace the adapter Repair and Calibration Repair of the VOA5 instrument in the field is NOT recommended If repair is necessary please contact Noyes Calibration is recommended every 36 months Please contact Noyes for proper calibration Battery Replacement When the battery gas gauge is low AA batteries require replacement To replace AA batteries 1 Remove the protective rubber boot from the instrument 2 Remove the battery compartment cover located on the back of the instrument 27 3 Replace the discharged batteries 4 Replace the cover and rubber boot Section 6 Specifications Specifications Optical Specifications VOA5 MM Fiber Type 62 5um multimode Wavelength Range 850 1300 nm Calibrated Wavelengths 850 1300 nm Attenuation Range 0 to 30 dB Insertion Loss max E o onm 3 0 dB 130
9. llow us to serve you more efficiently please include a brief description specifying the reasons for the return of the equipment AFL Telecommunications Noyes Test amp Inspection 16 Eastgate Park Road Belmont NH 03220 Phone 800 321 5298 603 528 7780 Fax 603 528 2025 Contents Safety IMormatioT ssr 1 Section 1 General Information Contacting Noyes Customer Service s s s 2 Unpacking and Inspection Feature OVEIVIECW sess iirrainn E En EEEa Recommended Accessories VOAS Ports and KEYS esisin Setting the Calibration CAL Factor 7 Section 3 Applications Measuring Optical System Operating Limits Local Control 9 Measuring Optical System Operating Limits Remote Control 11 Field Testing of Optical Margin sssrin 13 Section 4 Remote Commands and Error Codes Programming the Attenuator ccccccceseeceseseesseeereseeeeees 15 Flyperlenminal Sellp s es eseci ies ead vesneeelaees ees ri S a atAS 17 Command SUMMETY ccccecccesetessesecessssetesssseeessseeseresseeesess 18 Remote Commands Section 5 Maintenance Cleaning the Optical POMS rsss 26 Repair and Calibration Battery Replacement Section 6 Specifications SPECIFICATIONS secesseessersssesessensesssasstsneneesesassesneeneesesanets 28 Safety Information CAUTION To avoid serious eye injury never look directly into the optical outputs of fiber optic network equipment test equipment patch cords or test ju
10. mpers Always assume that optical outputs are on NOTICE VOA5 Variable Optical Attenuators contain no user serviceable parts Except for changing batteries and cleaning optical ports these units must be returned to Noyes or authorized agents for repair and calibration IMPORTANT Proper care in handling should be taken when using any precision optical test equipment Scratched or contaminated optical connectors can impact the performance of the instrument It is important to keep the dust caps in place when the unit is not being used Section 1 General Information Thank you for purchasing a Noyes VOA5 Variable Fiber Optic Attenuator The purpose of this user s guide is to explain how to use and maintain this test equipment Please check our web site at www AFLtele com go Noyes for updates to this manual software updates and additional application information If you have any questions about your instrument and recommended accessories or if you need technical or sales support please contact Noyes Customer Service Contacting Noyes Customer Service You may call Noyes Customer Service between 8 a m and 5 p m United States Eastern Time as follows Phone 800 321 5298 North America 603 528 7780 Fax 603 528 2025 Mail NoyesTechSupport afltele com Unpacking and Inspection This instrument has been carefully packed in accordance with standard shipping procedures 2 Examine the equipment for damage that may have occurred durin
11. nds will enter the VOAS into the calibration adjustment mode Use the Arrow keys to adjust the calibration value When adjustments are done press the CAL key to return the VOA5 to the normal attenuation adjustment mode 7 Power key Press to turn power on or off Battery compartment The battery compartment is located on the back side of the VOA5 and may be accessed by removing the protective rubber boot Power port The VOA5 may be powered from the supplied 120 or 220 volt AC adapter Once external power adapter is applied to the VOAS the unit will turn on automatically 10 Serial port The serial port is used for connecting the VOA5 to a computer via a serial cable for remote control Setting the Calibration CAL Factor The total optical attenuation of a VOAS test setup A is the sum of the variable attenuation produced by the VOAS optical filter An plus a fixed calibration factor or CAL A Atte CAL total filter CAL is the fixed insertion loss of a VOA5 test setup that is a VOA5 plus two connected patch cords At the factory A values for each VOAS are measured at multiple filter positions at the calibrated wavelengths and stored in the unit s non volatile memory However you must measure and store a new CAL factor each time you configure a test setup To measure CAL you will need 2 jumper cables 1 optical light source OLS and 1 optical power meter OPM To set CAL factor 1 Set the OPM and OL
12. ould monitor the telemetry output of your optical system to verify it is operating normally 6 To measure the maximum attenuation lim t your control program should increase the VOA5 attenuation until telemetry indicates that optical system performance does not meet requirements Then it should decrease at requirements This applied attenuation val 7 To measure the minimum attenuation limi enuation until system performance just meets lue equals the maximum attenuation limit t your control program should decrease the VOAS attenuation until the minimum allowed optical span attenuation is reached or telemetry indicates that optical system performance does no until performance just meets requirement attenuation limit 12 meet requirements Then it should increase attenuation s This applied attenuation value equals the minimum Field Testing of Optical Margin The VOA5 may be used to measure optical margin the additional optical span loss that an installed optical system can tolerate and still meet design performance requirements In the field the simplest way to perform this test is to use an optical power meter OPM to measure added loss This eliminates the need to determine the CAL factor of your test setup that is your VOA5 and associated jumper cables The following procedure assumes you are at the East end of a dual fiber system and are measuring the optical margin in the West to East di
13. ption This command sets the attenuation to the minimum value for the current wavelength The minimum value is equal to the insertion loss CAL Example VOA HOME A Command INP POW Syntax INP POW Description The power source query commands the instrument to return its current power source Data Range return value 0 AC power 1 Alkaline battery power 2 Rechargeable battery power Example INP POW la Command INP PER Syntax INP PER 24 Description The battery percentage query commands the instrument to return its current battery percentage Data Range return value 110 AC power 0 10 20 100 Battery percentage Example INP PER 304 Unrecognized Commands If the VOA5 does not recognize a command it will respond with an NAK Hex 0x15 followed by a carriage return and line feed Examples INP ATQ asdlkj INP PPR 25 Section 5 Maintenance Cleaning the Optical Ports AN CAUTION Before conducting the following procedures be sure to have the unit turned OFF Optical ports must be kept free from dirt or other contaminates to ensure accurate measurements and operation 1 Rotate the adapter base counterclockwise approximately four times 2 Pull the adapter directly out away from the universal adapter mount 3 Perform one of the following If using Noyes Cleaning Supplies 26 Leaning the FCC2 can back 30 press the button on t
14. quirements If necessary increase attenuation until system performance just meets requirements The attenuation value displayed by the VOA5 equals the minimum attenuation limit jumper cable 1 jumper cable 2 VOAS 10 Measuring Optical System Operating Limits Remote Control To operate the VOA5 remotely you will need e Optical system with a telemetry output to monitor system performance e Computer with an available serial port e Serial cable e Control program development system such as Microsoft Visual Basic 1 Connect your VOA5 to the computer serial port 2 Set the calibration CAL factor refer to section Setting the calibration CAL factor Note To Set the CAL factor remotely use the INP OFFS command 3 Via remote control set VOA5 attenuation to the approximate mid range optical span loss value for your optical system For example if your system is designed to operate over optical spans with from 10 to 50 dB of loss set VOA5 attenuation to 30 dB Transmitter jumper cable 1 Receiver jumper cable 2 serial cable VOAS 11 Note Set attenuation using the INP ATT command 4 Connect jumper cable 1 to the output or your receiver Do not disconnect either jumper cable fro your transmitter and jumper cable 2 to the input of m the VOAS 5 Your control program sh
15. rection Thus you will insert your VOAS jus before an optical receiver input typically a low optical power point To measure margin in the opposite direction from the same location you will need to insert your VOA5 just after the output of an optical transmitter output typically a high optical power point In either case always follow al optical system safety rules required by your company 1 Power your VOA5 and press ZERO to set attenuation to its minimum value Note Displayed attenuation will now equal the CAL value currently stored in your VOA5 s non volatile memory This value should be ignored because an OPM will be used to measure the loss added by your VOA5 and jumper cables Disconnect the jumper cable at the input to the optical receiver This jumper cable will be referred to as jumper cable 1 13 3 Connect jumper cable 1 to an optical power meter OPM and measure the optical power patch panel patch panel with no added attenuation Call this power level P1 the power seen by the optical Relist Receiver receiver in normal operation jumper cable 1 4 Connect jumper cable 1 to the optical port of the VOA5 5 Use jumper cable 2 to connect the other OPM optical port of your VOA5 to the input of your optical receiver as shown dej i isi patch pane patch pane 6 Increase VOAS attenuation until the optical s system performance does not meet
16. summery of the commands Command Function IDN Commands the instrument to identify itself INP SER Query VOA5 for serial number INP MOD Query VOA5 for model number INP VER Query VOA5 for firmware version INP ATT VALUE Set VOA5 attenuation to lt VALUE gt dB INP ATT Query VOA5 for current attenuation value INP WAV VALUE Set VOA5 wavelength to lt VALUE gt nm INP WAV Query VOA5 for current wavelength INP OFFS VALUE Set VOA5 CAL factor to VALUE dB INP OFFS Query VOA5 for current CAL factor VOA HOME Set VOA5 attenuation to minimum value INP POW Query VOA5 for current power supply AC Alk bat NiMH bat 18 INP PER Query VOA5 for current battery level percentage INP BATVOLT Query VOA5 for current battery voltage Remote Commands Command IDN Syntax IDN Description The identification query commands the VOA5 to identify itself Example IDN Noyes Fiber Systems Variable Optical Attenuator Model VOA5 MM Serial EXBO20904014 Command INP SER Syntax INP SER Definition The serial number query commands the instrument to return its 9 digit serial number Example INP SER EXB2094014 19 Command INP MOD Syntax INP MOD Description The model number query commands the instrument to return its model number For the multimode units the model number is VOAS MM Example INP MOD MM
17. unication refer to www beyondlogic org All commands sent to the VOA5 end with a carriage return and line feed When the VOA5 receives a command it returns an ACK 4 0x06 or NAK 0x015 followed by a carriage return and line feed If the VOA5 recognizes a command it will respond with an ACK followed by carriage return and line feed If the VOA5 does not recognize a command it will respond with an NAK followed by a carriage return and line feed 16 HyperTerminal Setup HyperTermnal WINDOWS operating systems can be used to communicate with the VOA5 To setup HyperTerminal use the following steps 1 2 Turn on the VOA5 and connect it to the PC via a 9 pin 1 to 1 serial cable Open HyperTerminal found under PROGRAMS ACCESSORIES COMMUNICATIONSSHYPERTERMINAL Open a new connection Connect to COM1 Some PCs use COM2 COM5 etc See Windows hardware device manager for exact location Set the Port Settings to 9600bps 8 data bits none parity 1 stop bit none flow control 6 Goto FILE PROPERTIES gt SETTINGSS ASCII SETUP and select Send line ends with line feeds and Echo typed characters locally Type the command IDN and press Enter The VOA5 should return information similar to Noyes Fiber Systems Variable Optical Attenuator Model VOA5 MM Serials EXB02090401a 17 Command Summery The VOA5 commands are defined according to SCPI Standard Commands for Programmable Instruments The following is a
18. ys all the attenuation data for the selected wavelength and calibration factor information The lower section displays user prompts status messages etc Wavelength Key Press to select one of the factory calibrated wavelengths When you change the wavelength setting the VOA5 will adjust its optical filter to maintain the displayed attenuation at the new wavelength Press and hold to adjust the display contrast value use the Up and Down arrow keys for adjustment Arrow keys Left and Right arrow keys Used to move the selection cursor left or right to select which digit in the displayed attenuation or calibration value will be changed by the Up and Down arrow keys Up and Down arrow keys Increment or decrement the currently selected digit by one Input Output port gt e Power port l pr JI Porti VOAS Variable Optical Attenuator Pot2 ATL 10101 Input Output port Ik Serial port Zero key Calibration key Power key Display Arrow keys Wavelength key Zero key When this key is pressed the VOA5 will reset the filter attenuation to zero and therefore display an attenuation factor equal to the current value of CAL the calibration factor insertion loss of your attenuator and jumper cables CAL calibration key Pressing and holding the CAL key for approximately three seco
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