JDS Uniphase RM3750 User's Manual
Contents
1. 32 Maintaining the Meler eo eee te HP Ren pea rho tede Rn 33 Cleaning tie Unit da Sr ected eoe yeas eie dol einer ui epe dur sire er bebe 33 Cleaning the Connector Ends eeeseseeeeeeeeennn nennen 33 Recharging the Baltaryu 34 Replacement of Internal nnne 34 Troubleshooting soon on ub ere tet be h ea etd Oben 34 Programming Guilde ein trie tre cete tenti ea Ea EE IEEE REIR 37 H32932 Serial Interface e aped EU wa eO rU Rn etd 37 H35232 Pini AssignmenL oo tee obere eae hem ne aid te elke DM ER 37 RS232 Interface 37 hS232 GPIB CODVOFIBE eon reete plot Hie ote ptio ton e 39 Lett Dip SWteh E caver ede teed E 39 FightDIp SWIIGI sut ect pee ct E 39 Programming Examiples ruere ere e pde ec lr 40 RS232 Interface Program Example 40 Customized Features and Test 41 For sales and service information contact JDS Uniphase or your local represe2. eeeeeeeeeeeeeeeeeeeeeeeenee nennen 22 10112341 Rev 002 Page 2 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Front Pallalics cenit conto 22 PERE MM MM M i e 23 Terminator RE CHIMQUGS a Nt ark doeet pude 23 Termination Techniques for Single mode Fiber except 980 nm 23 Termination Techniques for Single mode 980 nm and Multimode Fiber 24 Backreflection 25 Setting Up the Meter for Backreflection 25 Measuring Backreflection 26 Backreflection Accuracy and 27 Loss and Power Measurements eeessssssessseeeeenenne enne 27 Setting Up the Meter for Loss and Power Measurements 27 Measuring POWEF 2 28 Measuring Relative Power Insertion 055 29 Power ACCUTaCy cb 30 Data Logging Using the Foot Pedal pur pia 30 Messages and 30 Calibrating the Meter roO e 31 Backreflection Calibration 32 Power Calibration
3. 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL RM3 SERIES BACKREFLECTION METER User s Manual JDS Uniphase 10112341 Rev 002 Page 1 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Contents Safety Information Instructions and 4 Safety Informati Merias Mta ut aca eae e eae fe Se 4 CIASSHICANON PT 4 Disconnecting from Line oc Dr ptt b 4 Line Power Requirements cccccccceeeeeeeeeeeeeeeeeeeeeeeteaaaaaaaaaaeeeeeeeeeeenenaaaaes 4 Fuse cc 4 Laser Specifications 4 EOM KENT RT 6 Before Initializing and Operating the 6 Operating trie Units eec ae te te tue imde 6 Symbol os ca wae os adus edt 8 Compliance misiis T Pre 9 CE Combliah 6B vates ER te EU a ed Rund t mpeg 9 FDA GDRH Gomplian g 6 rae iac le mae hale 9 CSA IEC COImpllal6e eae acca ais dia acide ede 9 General Information and Specifications 11 General Information roce mte eoe Pe rires tek Hire te t ER irt 11 Backreflection 12 Loss and Power
4. The following symbols and messages can be marked on the unit Table 2 Observe all safety instructions that are associated with a symbol Table 2 Safety Symbols Laser safety See the user s manual for instructions on handling and operating A the unit safely A See the users manual for instructions on handling and operating the unit safely y Electrostatic discharge ESD See the users manual for instructions on A handling and operating the unit safely ee Frame or chassis terminal for electrical grounding within the unit EN Protective conductor terminal for electrical grounding to the earth The procedure can result in serious injury or loss of life if not carried out in proper compliance with all safety instructions Ensure that all conditions necessary for safe handling and operation are met before proceeding CAUTION The procedure can result in serious damage to or destruction of the unit if not carried out in compliance with all instructions for proper use Ensure that all conditions necessary for safe handling and operation are met before proceeding 10112341 Rev 002 Page 8 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Compliance CE Compliance The unit has been designed and tested to comply with directive 73 23 EEC and its subsequent amendments by the European Community EC or CE The directive relates to electrical equipment designed for use within certain vo
5. To adjust the value of User CAL 1 Use a screwdriver or an appropriately narrow object to press the CAL key on the back of the RM meter The last User CAL value stored is displayed on the RM meter 2 Press and hold the Store BR key to scroll to the required value in 0 1 dB increments 3 Press the CAL key to store the User CAL value and return the RM meter to the backreflection measurement display Perform calibration adjustment for the second wavelength 1 Repeat the calibration adjustment procedure for the second wavelength Power Calibration Adjustment To perform a power calibration adjustment 1 Press the Power key to set the RM meter to Power mode In Power mode the meter displays P at the beginning of the reading and the value displayed is not followed by rel An example is P 9 dBm 2 Clean and connect the FC APC connector green boot of the calibrated jumper to the output port of the meter 10112341 Rev 002 Page 32 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL 3 Press the key to select the wavelength at which the calibration check is to be performed Choose either wavelength as you will check both 4 Measure the power from the output of the calibrated jumper using a high accuracy calibrated power meter 5 Clean the output connector of the calibrated jumper and connect it to the detector on the front panel of the RM meter The value displayed on the RM meter must ma
6. use To minimize any memory of the bends in the cable jacket do not pull on the cable while winding and occasionally wind the cable in the opposite direction figure 5a termination BR 60 0 dB Figure 5a Terminating the Jumper for BR Measurement for Single mode except 980nm 2 The second termination is made after the DUT in order to obtain figure BR 60 0 dB termination point termination point for 1 for BR Oi O measurement jumper i FC PC example Figure 6a Measuring Backreflection for Single mode except 980 nm Termination Techniques for Single mode 980 nm and Multimode Fiber Termination is performed by using index matching gel 1 Apply index matching gel directly to the fiber end figure 5b 2 After measuring BRo clean the connector end in accordance with the Cleaning Connectors section 10112341 Rev 002 Page 24 of 39 JDS Uniphase 3 RM3 SERIES BACKREFLECTION METER USER S MANUAL termination measurement jumper FC PC example Figure 5b Terminating the Jumper for BR Measurement for Single mode 980 nm only and Multimode The second termination is made after the DUT in order to obtain Br figure 6b rec T _ backreflection area termination point for BR measurement jumper yam DUT i P di FC ST termination point 4 example for BR FC PC example Figure 6b Measu
7. Measurements 12 Output POIL e US RD cq aD i 13 Internal Light SOURCES eai bere etta Fb Fo Soit eds 13 Hybrid Jumpets aae m et te o ene kd eu e RR ee Shaped rhet nad 13 Coherence Length ctun cao it uat a iocus eR en ca buds 13 Electrical Regulremenis not ret S hace pace nn m hues Dc dr ue aus 13 aai c P 13 PM LT 14 Standard ACCSSSOMCS eitis oie dfi as ees sete eon S 14 Optional AG6GOSSOFIOS 5 ote pr E EE A RUE UR TR E ur oer ERR e Ka 14 Specifications s docete potat ost tabac ta t n a tip teed ha in ades betae nado du oe ae sales 15 SUT oc sects DU E 18 Before Initializing and Operating the 18 Initial WIS 2 COM i ecce terete ea hot ute uie tore ut a baat Li tM 18 Operating Bea ae URIS edo ES eR tes 19 19 Temp rat rg iaman Oe dus 19 19 WON AGG TE EE 19 SIPPING M sae cate cal oe ie oa iad oar 19 Claims and Bepackagiig oerte 19 Returning Shipments to JDS Uniphase 19 CIB IIE CONNECt xc 20 Powering Up the MOIBE eost aes teas a 21 Operating and Maintenance Instructions
8. devices the GPIB address can be changed Left Dip Switch The settings for the left dip switch are shown in Table 10 Table 10 Left Dip Switch Settings CONFIG ON use large serial buffer enable SRQ Right Dip Switch The settings for the right dip switch are shown in Table 11 Table 11 Right Dip Switch Settings BAUD RATE all OFF set baud rate to 2400 DATA FORMAT OFF odd even parity OFF disable parity checking A use 2 stop bits use 8 bits per character HANDSHAKE oe disable XON XOFF protocol 10112341 Rev 002 Page 39 of 39 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Programming Examples RS232 Interface Program Example The following program can be used to connect the RM meter with an external device through the RS232 serial interface CLOS 100 110 200 OPEN PRI B ns 210 220 230 PRIN 240 STOP 250 FOR measurem 260 PR INP IF U INS Wy it I 1 5 ents INT 1 270 280 PR INPUT 1 INS INS 290 NEXT INT 300 PRIN 4 A 310 320 330 PRIN 340 STOP 350 FOR measurem 360 INPU INS mn I 1 TO 5 ents 370 380 INP PRI INS INS 390 NEXT 400 410 LOS ND AAS P 1 10112341 Rev 002 mv L2
9. laser sources POWER Sets the meter to Power and Relative Power measurement modes 10112341 Rev 002 Page 22 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Rear Panel The back of the meter Figure 4 can vary with the model WARNING NO OPERATOR SERVICABLE PARTS INSIDE REFER SERVICE TO TRAINED SERVICE PERSONNEL DISCONNECT POWER SUPPLY BEFORE SERVICING WARNING FOR CONTINUED FIRE PROTECTION USE BEFORE REPLACING FUSE TO AVOID ELECTRICAL SHOCK THE POWER CORD PROTECTIVE CONDUCTOR MUST BE CONNECTED TO GROUND CAL LOG RS232C AN 100 240 V OL 9 5 VA max Fuse 1A 250V THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS 1 THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE AND THIS DEVICE COMPLIES WITH DHHS RULES 21 CFR 2 THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED SUBCHAPTER J APPLICABLE AT DATE OF MANUFACTURE INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION Figure 4 Back of the Meter The components on the rear panel are described in Table 6 Table 6 Rear Panel Components CAL Access to the User CAL value for calibration purposes LOG Foot pedal jack for data logging RS232C RS232 serial interface port Termination Techniques Termination is a technique used to block all backreflections beyond a certain point in a network of components In all measurement testing two terminations must be made th
10. sleeve in accordance with the Cleaning Connectors section 4 Reinstall the connector onto the panel 5 Reinstall the connector panel To avoid damaging the input and output port fibers make one or two large loops in the fibers when replacing the panel Recharging the Battery The letter B is displayed on the RM meter when the battery power is low To recharge the battery 1 Connect the meter to the AC source The RM meter can be used while it is recharging Replacement of Internal Fuses The following fuses can be replaced by JDSU qualified technicians only 1 Fuse F1 on battery protection circuit PCB 250V F2A 2 Fuse on battwery cord 250V F 1 6 10 A Troubleshooting If any problem described in this section persists contact JDS Uniphase or your local representative Every backreflection measurement is affected by the loss before the DUT and by reflections before and after the DUT 10112341 Rev 002 Page 34 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Loss Before the DUT When a DUT is connected to the RM meter the loss from connectors before the DUT affects the backreflection reading Because the light is going out from the RM meter and then returning it goes through the connectors twice so the effect of the loss is doubled If the loss is close to 0 15 dB its effect is compensated automatically by the meter If the loss differs substantially from 0 15 dB follow the mea
11. 300 N 9 2 AS 1 Initialize the RS232C port Go to Backreflection mode THI ILL NOT DISPLAY THI EN GOTO 250 BR Check if the command was accepted BR Read and display five Go to Power mode PRINT 1 G INPUT 1 NT EN GOTO 350 Check if the command was accepted ILL NOT DISPLAY POWER Read display five power Page 40 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Customized Features and Test Data 10112341 Rev 002 Page 41 of 39
12. 5 dB 40dB for multimode For example if BRo is 40 dB the minimum backreflection of the DUT that can be measured is 55 dB An asterisk is displayed near the range limit last 5 dB of range if using BRo below 60 dB otherwise to indicate that the setup and measurement procedures described in the previous two sections must be followed carefully to ensure accurate results Absolute accuracy specifications are dependent upon the accuracy of the RM meter calibration so a calibration check needs to be performed periodically see the Calibrating the Meter section Loss and Power Measurements Setting Up the Meter for Loss and Power Measurements To prepare the meter for loss and power measurements 1 Ensure that the RM meter is powered off 2 Set the power switch to ON and allow the RM meter to stabilize 3 Clean the output port on the front of the meter and the FC APC connector green boot of the measurement jumper and connect this end of the jumper to the output port Ensure that you are using the measurement jumper and not the calibration jumper which is labeled as such For each wavelength at which measurements are to be made 4 Press the key to select the required wavelength 10112341 Rev 002 Page 27 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL 5 Attach the appropriate detector adapter to the detector on the front of the meter 6 Connect the output connector of the measur
13. 50 V fast Laser Specifications Laser specifications are provided in Table 1 Table 1 Specifications Parameter Single mode SM Multimode MM Wavelength 980 1310 1480 1550 1625 850 or 1310 20 nm or 1650 10 nm Class 1 1 Fiber Type 9 125 um SM 5 125 um SM 50 125 um MM 62 5 125 um MM Maximum Accessible 15 dBm 23 dBm 25 dBm Emission Level Maximum Output Power 4 dBm 4 dBm 4 dBm Numerical Aperture 0 13 0 14 0 20 0 28 Effective Numerical 0 20 0 21 0 27 0 34 Aperture 10112341 Rev 002 Page 4 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Under the laser classification of the US Food and Drug Administration FDA Center for Devices and Radiological Health CDRH the laser contained in the unit is a Class 1 laser CLASS 1 LASER PRODUCT 10112341 Rev 002 Page 5 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Safety Instructions The following safety instructions must be observed whenever the unit is operated serviced or repaired Failure to comply with any of these instructions or with any precaution or warning contained in the user s manual is in direct violation of the standards of design manufacture and intended use of the unit JDS Uniphase assumes no liability for the customer s failure to comply with any of these safety requirements Before Initializing and Operatin
14. 8 Release the termination The meter now displays the backreflection of the DUT only 9 measurement is to be made at a second wavelength repeat steps 1 through 8 The small amount of reflections that BRo represents can be polarization sensitive and multiple reflections can cause interference effects that can make the reflections very sensitive to 10112341 Rev 002 Page 26 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL temperature To ensure accurate backreflection measurements below 65 dB 25 dB for multimode 1 Perform the BR measurement at least once per shift The measured backreflection is affected by losses that can occur between the meter and the DUT To compensate for these losses measure the total amount of loss between the output of the measurement hybrid jumper and the input of the DUT see the Loss and Power Measurements section Double this value and add it to the backreflection value displayed on the meter In the following example the total loss between the meter and the DUT is 2 0 dB and the displayed backreflection is 29 dB BR 29 dB 2 x 2 0 dB 25 dB Backreflection Accuracy and Range The absolute accuracy of backreflection measurements made with the meter is dependent on the level of backreflection to be measured The backreflection measurement range is restricted by the BR level The meter can measure backreflection levels 15 dB below to a maximum of 7
15. Altitude The unit can be operated at an altitude up to 2000m Temperature The unit can be operated in the temperature range of 0 to 40 C Humidity The unit can be operated in environments with up to 95 humidity 0 to 40 C Do not expose it to any environmental conditions or changes to environmental conditions that can cause condensation to form inside the unit Voltage The main supply voltage fluctuations are not exceeding 10 of the nominal voltage Warning e Do not use the unit outdoors e To prevent potential fire or shock hazard do not expose the unit to any source of excessive moisture Storing and Shipping To maintain optimum operating reliability do not store the unit in locations where the temperature falls below 40 C or rises above 70 C Avoid any environmental condition that can result in internal condensation Ensure that these temperature and humidity requirements can also be met whenever the unit is shipped Claims and Repackaging Immediately inform JDS Uniphase and if necessary the carrier if e The contents of the shipment are incomplete e The unit or any of its components are damaged or defective e The unit does not pass the initial inspection In the event of carrier responsibility JDS Uniphase will allow for the repair or replacement of the unit while a claim against the carrier is being processed Returning Shipments to JDS Uniphase JDS Uniphase only accepts returns for which an appr
16. IEEE 488 GPIB port Messages and Symbols The messages and symbols displayed by the RM meter are described in Table 7 Table 7 RM Meter Display Messages and Symbols RMXXXX ERY Y Displayed momentarily during the power up sequence and indicates 10112341 Rev 002 Page 30 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL internal reference measurements are made p 2 XX XXdBm Power mode P XX XXdB rel Relative Power mode 3 Displayed when the BR value is within the last 5 dB of range if using BRo or from 60 to 75 dB if not using BRo B Low battery P or BR is lower than the minimum value P is greater than the maximum value ED XX X Displayed momentarily when the BR value XX XdB is being stored as BRo 1 3 BR CAL X X Indicates the backreflection user calibration value at 1 3 um 1 3 um is taken as an example 1 5 BR CAL X X Indicates the backreflection user calibration value at 1 5 um 1 3 PW CAL X XX Indicates the power user calibration value at 1 3 um 1 5 PW CAL X XX Indicates the power user calibration value at 1 5 um Calibrating the Meter Caution Devices with malfunctioning lasers must be returned to the manufacturer for calibration Annual calibration of the meter by JDS Uniphase is recommended This section outlines how to do periodic adjustments to ensure the accurac
17. cter or a measurement reading The command G initiates the transmission of a measurement The meter returns the most recent measurement The transmission also includes the wavelength at which the measurement was made and the characters CR lt LF gt The character commands that control the meter via the RS232 serial interface port are listed in Table 9 When a command is accepted the letter Y is returned When a command is not recognized or not accepted the letter X is returned Table 9 Character Commands command O Set relative power to zero Set wavelength to the laser connected to the first LED on display eg Model RM3750 first laser 1310nm See Figure 3 Set wavelength to the laser connected to the second LED display eg Model RM3750 second laser 1550nm See Figure 3 0 sw Valid in Backreflection mode only Valid in Absolute Power and Relative Power modes only Valid in Relative Power mode only 10112341 Rev 002 Page 38 of 39 4 JDS Uniphase SERIES BACKREFLECTION METER USER S MANUAL RS232 GPIB Converter An optional user supplied RS232 to IEEE 488 converter can be used with the RS232 connector on the RM meter to access an IEEE 488 parallel interface The converter supplied with the appropriate RS232 cable is attached to the RS232 connector on the rear panel The converter is set up and tested as described in Table 10 and Table 11 To avoid conflict with other GPIB
18. e first for measuring BR is made before the DUT for example on the RM meter side the second for measuring BR is made after the DUT Both termination points need to be made as close as possible to the DUT to minimize the errors associated with Rayleigh backscattering in the fiber The backreflection of all components and connections between these two points is included in the equation for calculating the backreflection value BR of the DUTs Termination Techniques for Single mode Fiber except 980 nm Termination for single mode except 980nm is performed by mandrel wrapping High attenuation bends in the fiber bends with a relatively small radius remove all backreflection and can be made anywhere along the length of the cable When measuring backreflection levels below 60 dB low attenuation bends bends with a relatively large radius 10112341 Rev 002 Page 23 of 39 A JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL need to be made just before the high attenuation bends in order to offset the small amount of reflection caused by the high attenuation bends 1 Using the size of rod specified in the Inspection Report see the Customized Features and Test Data section wind the cable around the rod until the reading displayed on the RM meter no longer changes approximately six turns The diameter of the rod must be suitable for the type of fiber connected to the output port jumper and for the wavelength in
19. easurement jumper to be used exclusively for measurements and a hybrid calibrated jumper to be used exclusively for calibrations The RM meter can be operated using an internal 6 V DC rechargeable battery The RM meter includes a convenient foot pedal enabling the user to trigger the meter to send measurement data to a computer or printer The RM meter operates over the RS232 serial interface Wherever the IEEE 488 GPIB parallel interface is mentioned it is achieved via a RS232 to GPIB converter that can be purchased as an accessory 10112341 Rev 002 Page 11 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Backreflection Measurements Reflections in optical systems can come from a number of sources Primary sources include the fiber Rayleigh backscatter and Fresnel reflections that occur at the planar junction of two materials having different refractive indices for example connector and fiber endfaces splices bulk optic interfaces and detector surfaces Typically only Fresnel reflections are significant because transmitters are relatively insensitive to distributed reflections such as Rayleigh backscatter Backreflection caused by Rayleigh backscatter varies with the length and type of fiber and is only significant when measuring components with backreflections below 40 dB or with very long pigtails multimode However Rayleigh backscatter can be a large contributor to backreflection in install
20. ector Some connectors have a ceramic ferrule that can easily be broken Optical cable ends need to be cleaned before using them with the unit The following items are required for cleaning e Filtered compressed air or dusting gas for example Tech Spray Envi Ro Tech Duster 1671 gas available from http www techspray com Lint free pipe cleaners for example from or lint free swab e Lint free towels for example 10 x 10 cm or 4 x 4 in HydroSorb Ill wipers available from http www focenter com e Optical grade isopropyl alcohol or optical grade 200 ethanol do not use rubbing alcohol which contains 30 water To clean the connectors 3M is a trademark of 3M 10112341 Rev 002 Page 20 of 39 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL 1 6 7 Blow the sleeve with filtered compressed air Figure 2 sleeve ferrule Figure 2 Connector Cleaning connector type can vary Apply optical grade isopropyl alcohol or optical grade ethanol do not use rubbing alcohol to a small area of a lint free towel and rub the end of the ferrule over the wet area Wipe the ferrule on a dry area of the lint free towel Using the dusting gas or compressed air blow the end of the ferrule Apply the alcohol or ethanol to a lint free pipe cleaner or swab and wipe off the remaining parts of the connector With the other end of the pipe cleaner or swab dry the areas cleaned Using t
21. ed systems or when using long fiber The internal switch and coupler of the RM meter enable the meter to measure the internal light source signal Pin the signal offset with no light Paar and the total signal level from internal and external backreflections The RM meter first calculates the total backreflection from internal and external sources BR using the following equation where CAL is the factory set calibration factor of the meter BRiot 10 log Por Paark Pin CAL dB The backreflection from external sources BR is then calculated using the following equation where is the stored value of the total backreflection up to the device under test DUT and User CAL is the user set calibration factor BR 10 log 108 10 19 890 10 User CAL dB The RM meter then displays the value of BR The BR measurement takes approximately one second to complete Before this is done the Pi and Paak measurements are completed in approximately four seconds during which time the backreflection display is locked and the light from the output port is blocked The values are then updated every minute Loss and Power Measurements The RM meter is equipped with a front panel InGaAs detector for relative power loss and absolute power measurements Absolute power is referred to as power in this manual relative power is always referred to as relative power Because the meter is capable of storing the dark sig
22. ement jumper to the detector adapter This end of the measurement jumper is user selected and must be compatible with the input connector of the DUT 7 Press the Power key to set the meter to Power mode When in Power mode the meter displays P at the beginning of the reading and no rel is displayed for example P 9 dBm 8 Press and hold the Power key until the display on the meter clears 9 Release the Power key The display reads 0 00 dB and the loss of the measurement jumper is subtracted from the DUT loss or power measurements to be made Figure 7 FC PC measurement jumper example Figure 7 Loss and Power Measurements For loss and power measurements below 50 dBm 10 Ensure that the detector is covered for example that the detector cap is on or the output connector is connected to the detector This dark measurement current is subtracted from future loss and power measurements 11 Press the Store Ip key The key lamp lights to indicate that the user stored value of Ip the dark signal from extraneous sources is used to calculate the DUT loss or power If the detector is not sufficiently covered the message Too Much Light is displayed If the Ip value is not stored before a measurement is made the last value stored is used Measuring Power In Power mode absolute power measurements are displayed in dBm To make a power measurement of a DUT after performing the setup steps in the Setting Up the Me
23. erminal equipment DTE The data protocol is set to 2400 baud ASCII character code with eight bits per character two stop bits and no parity bit RS232 Pin Assignment The RS232 pin assignment is shown in Figure 11 Figure 11 RS232 Pin Assignment RS232 Interface Specifications The RS232 interface specifications are listed in Table 8 Table 8 RS232 Interface Specifications Sym Pin numar Signal Dresion Hawwesm mo 2 gt m 03 e Dacus es To connect the RM meter to the serial port of a computer 1 Attach a straight through RS232 cable to the computer and the RS232C port at the back of the meter 10112341 Rev 002 Page 37 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL On power up the RTS and DTR signals on the interface connector go positive indicating that the interface is ready to communicate The software on the controlling computer must enable the RTS line The interface controller waits for the CTS line to go positive before the measurements are transmitted The DCD line must go positive in order for the controlling computer to receive commands from the meter The meter responds to single character commands sent on the serial interface The characters must be sent individually without a message terminating sequence such as CR carriage return or lt LF gt line feed The meter acknowledges each character that is sent with a chara
24. g the Unit Inspect the unit for any signs of damage and read the user s manual thoroughly Install the unit as specified in the Getting Started section Ensure that the unit and any devices or cords connected to it are properly grounded Operating the Unit Warning To avoid the risk of injury or death always observe the following precautions before initializing the unit e To prevent hazardous radiation exposure use only the controls or adjustments and perform only procedures specified for the laser source If using a voltage reducing autotransformer to power the unit ensure that the common terminal connects to the earthed pole of the power source Use only the type of power cord supplied with the unit Connect the power cord only to a power outlet equipped with a protective earth contact Never connect to an extension cord that is not equipped with this feature Willfully interrupting the protective earth connection is prohibited Never look into the end of an optical cable connected to an optical output device that is operating Laser radiation is invisible and direct exposure can severely injure the human eye For more information see the user s manual of the laser source in use Do not use the unit outdoors To prevent potential fire or shock hazard do not expose the unit to any source of excessive moisture Do not operate the unit when its covers or panels have been removed Do not interrupt the pr
25. he Store key The key lamp lights to indicate that the background backreflection has been stored The BR value is used in the calculation of the DUT backreflection at the selected wavelength 8 Remove the termination Measuring Backreflection To measure backreflection and power from a unit after setting up the meter see the Setting Up the Meter for Backreflection Measurements section 1 Clean the output connector of the measurement jumper and the input connector of the DUT and mate the two 2 Press the key to select the wavelength at which the measurement is to be made 3 Terminate the measurement jumper immediately after the DUT and hold the termination point steady The meter displays the backreflection between the two termination points that is caused by the fiber all connections and the DUT This area is shown within the dashed line in Figure 6a for single mode except 980nm and in Figure 6b for single mode 980nm and multimode 4 If necessary terminate the fiber for BRo again just before the DUT to eliminate the backreflection caused by the fiber and all connections before the DUT 5 Press the Store BR key The key lamp lights to indicate that the function is on 6 If the backreflection setup has been done previously BR light is on press the BR button to delete the currently stored BR value The BR light turns off 7 Press and repeat step 6 to delete the stored BR value for another wavelength
26. he dusting gas or compressed air blow the areas cleaned Powering Up the Meter To power up the meter 1 2 Connect the meter to an AC power source using the power cord provided Set the power switch to ON to initialize the RM meter and observe the power up sequence The model number of the meter is displayed Internal measurements of P in and Pua are made The message Stabilizing is displayed as the light source stabilizes The backreflection value BR of the front panel connector is measured and displayed 10112341 Rev 002 Page 21 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Operating and Maintenance Instructions Front Panel The front of the meter model RM3750 is shown in Figure 3 and described inTable 5 Not all RM3 Series meters are exactly as shown ll JDS Uniphase RM3 BACKREFLECTION METER o ON 91310 1310 1550nm DUAL SOURCE 1550 OFF Figure 3 Front of the Meter Table 5 Front Panel Operating Keys and LEDs ON OFF Power on ON OFF switch Sets the meter to Backreflection measurement mode STORE BRo Stores the BR value used in backreflection measurements and toggles the key lamp on and off STORE Ip Stores the Ip value used in dark measurements Selects one of the two
27. ls Check that the unit and contents are complete 1 Inspect the shipping container for any indication of excessive shock to the contents and inspect the contents to ensure that the shipment is complete 2 Inspect the unit for structural damage that can have occurred during shipping 3 Connect the unit to the power source using the power cord provided 4 Set the power switch to ON to initialize the RM meter and observe the power up sequence The model number of the meter is displayed Internal measurements of P in and are made The message Stabilizing is displayed as the light source stabilizes The backreflection value BR of the front panel connector is measured and displayed 5 Set the power switch to OFF and disconnect the RM meter 6 Connect the foot pedal to the Log port at the back of the meter if you intend to send data from the meter to a computer or printer 7 Keep the packaging Immediately inform JDS Uniphase and if necessary the carrier if the contents of the shipment are incomplete if the unit or any of its components are damaged or defective or if the unit does not pass the initial inspection 10112341 Rev 002 Page 18 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Operating Environment In order for the unit to meet the warranted specifications the operating environment must meet the following conditions for altitude temperature humidity and voltage
28. ltage limits It ensures that electrical equipment is constructed with good engineering practice in safety matters The unit has been designed and tested to comply with directive 89 336 EEC and its subsequent amendments The directive relates to electromagnetic compatibility It demands that electromagnetic disturbance does not exceed a prescribed level that the equipment be immune to a prescribed level of ambient level of interference that the equipment be protected against electrostatic discharges and that the equipment be immune to all electrical shock wave disturbances As of 1997 measures have been added to test for fire hazard electric shock hazard and also external exposure to other forms of energy The requirements specified by directive 89 336 EEC are as follows CE compliance requires that the manufacturer or its authorized representative established within the Community affix the CE conformity mark to the apparatus or else to the packaging instructions for use or guarantee certificate The CE conformity mark shall consist of the letters CE as specified and the figures of the year in which the mark was affixed This mark should where appropriate be accompanied by the distinctive letters used by the notified body issuing the type examination certificate Where the apparatus is the subject of other Directives providing for the CE conformity mark the affixing of the CE mark shall also indicate conformity with the relevant requireme
29. ly however a temporary conductivity caused by condensation must be expected 10112341 Rev 002 Page 10 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL General Information and Specifications General Information This users manual for the RM3 Series Backreflection Meter contains complete operating instructions The RM meter can be ordered as a single mode or multimode model Software is bundled with the meter for information on using the software see the Multiple Connector Test System Software Users Manual document SD000318 The inspection report and a description of any customer requested information are found in Customized Features and Test Data section The RM meter Figure 1 is a portable direct display instrument that measures backreflection loss and power of single mode and multimode fiberoptic connectors components and systems The RM meter is supplied with one or two internal laser sources for operation at 850 980 1310 1480 1550 1625 or 1650 nm not all combinations are available Figure 1 RM Meter An important feature of the RM meter is the FC APC ultra low backreflection connector at its output port SC APC connector also offered By switching hybrid jumpers connected to the FC APC connector the user can select the connector type required for a measurement quickly and easily without limiting the backreflection range of the meter The RM meter is supplied with a hybrid m
30. nal from the detector high accuracy power measurements as low as 80 dBm for the single mode model and 60 dBm for the multimode model can be obtained When making power measurements the RM meter first measures two signals the total signal level lot and the dark signal from the detector lp The RM meter then calculates the power measurement using the following equation where CAL is the factory set calibration factor and User CAL is the user set calibration factor P 10 log lot Ip CAL User CAL dB 10112341 Rev 002 Page 12 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Output Port The output port of the RM meter is equipped with an ultra low backreflection APC connector To prevent damage to the output port connector a measurement jumper must be used for all measurements even for measuring a component with an APC connector Internal Light Sources The RM meter can be equipped with two internal laser sources These are thermoelectrically cooled for added stability and are modulated at 10 kHz Fast changes in ambient temperature can cause a source to become unstable If this occurs the meter automatically switches to a measuring mode in which Pin and Paark are measured more frequently than every minute and the message Source Unstable is displayed The light source power is monitored and the meter returns to the standard measurement mode when the source has stabilized Hybrid Jumpe
31. ntative JDS Uniphase Corporation 570 West Hunt Club Road Nepean Ontario Canada K2G 5W8 Phone 613 727 1303 Fax 613 727 8284 E mail instruments jdsuniphase com 10112341 Rev 002 Page 3 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Website http www jdsuniphase com Safety Information Instructions and Symbols Safety Information Classification The RM Series Backreflection Meter consists of an exposed metal chassis that is connected directly to earth via a power cord and therefore is classified as a Class 1 instrument Disconnecting from Line Power Some of the circuits are powered whenever the unit is connected to the AC power source line power To ensure that the unit is not connected to the line power disconnect the power cord from either the power inlet on the unit s rear panel or from the AC line power source receptacle The power cord must always be accessible from one of these points If the unit is installed in a cabinet the operator must be able to disconnect the unit from the line power by the system s line power switch Line Power Requirements The RM meter operates from any single phase AC power source that supplies between 100 and 240 V at a frequency range of 50 to 60 Hz The maximum power consumption of the RM meter is 25 VA The unit can also be operated using its internal 6V DC rechargeable battery Fuse Type The fuse type used by the unit is 5 x 20 mm 1 A 2
32. nts of those other Directives FDA CDRH Compliance Under the US Food and Drug Administration FDA Center for Devices and Radiological Health CDRH the unit complies with the Code of Federal Regulations CFR Title 21 Subchapter J which pertains to laser safety and labeling See http www fda gov cdrh radhlth cfr 21cfr1000 1050 pdf for more information CSA Compliance The unit complies with certain standards of the Canadian Standards Association CSA and the International Electrotechnical Commission IEC The unit is in Installation Category Overvoltage Category Il under IEC 664 IEC 664 relates to impulse voltage levels and insulation coordination The particular category is defined as local level appliances portable equipment etc with smaller transient overvoltages than Installation Category Overvoltage Category Ill The unit is in the Pollution Degree 2 category under IEC 1010 1 and CAN CSA C22 2 No 1010 1 The IEC standard on Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use relates to insulation coordination The CSA standard is on Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part General Requirements The Pollution Degree 2 category is defined as follows Normally only 10112341 Rev 002 Page 9 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL non conductive pollution occurs Occasional
33. ons Internal Backreflection for single mode model only except 980 nm model To confirm proper operation of the RM meter terminate the internal cable while using the factory set value key lamp is off The backreflection reading must be less than 65 dB Long Cables for single mode model only except 980 nm model Terminate the cables near the devices or connectors being tested in order to eliminate backreflections from the fiber 10112341 Rev 002 Page 35 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Laser Stability If the messages Source Unstable or Input Low are displayed remove the front connector panel clean the front panel connectors connect the internal FC APC connector to the detector adapter and press the Power key to set the meter to Power mode The reading must be steady and higher than 10 dBm If not perform the procedure recommended in the table that follows Calibration If the backreflection or power calibration was not performed properly set BR CAL to 0 3 dB and Power CAL to O dB to restore the factory set calibration These settings provide reasonably accurate backreflection and power measurements Other Meter does not turn on Set the power switch to OFF connect the RM meter to a power source and wait a few minutes before turning the power switch on STABILIZING Message is displayed for a Set the power switch to OFF connect long
34. ons such as flat end connectors Add 0 1 dB between 70 and 80 dBm Immediately after performing a dark measurement 7 Add 0 1 dB between 0 to 3 dBm and between 35 and 40 dBm A c 10112341 Rev 002 Page 15 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Flexcor is a trademark of Corning 10112341 Rev 002 Page 16 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Table 4 Other Specifications Input voltage 100 to 240 V AC 50 to 60 Hz Dimensions WxHxD Wein Humidity maximum 95 RH from 0 to 40 C Equipment positioning transportable 10112341 Rev 002 Page 17 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Getting Started The RM3 Series Backreflection Meter consists of the meter AC power cord two jumpers and a foot pedal Before Initializing and Operating the Unit Inspect the unit for any signs of damage Read the users manual thoroughly and become familiar with all safety symbols and instructions to ensure that the unit is operated and maintained safely If the unit is used in a manner not specified by JDS Uniphase the protection provided by the unit may be impaired Initial Inspection Warning To avoid electrical shock do not initialize or operate the unit if it bears any sign of damage to any portion of its exterior surface such as the outer cover or pane
35. otective earth grounding Any such action can lead to a potential shock hazard that can result in serious personal injury Do not operate the unit if an interruption to the protective grounding is suspected In this case ensure that the unit remains inoperative 10112341 Rev 002 Page 6 of 39 JDS Uniphase 10112341 Rev 002 RM3 SERIES BACKREFLECTION METER USER S MANUAL not use repaired fuses and avoid any situations that can short circuit the fuse Unless absolutely necessary do not attempt to adjust or perform any maintenance or repair procedure when the unit is opened and connected to a power source Repairs are to be carried out only by a JDSU qualified technician Do not attempt any adjustment maintenance or repair procedure to the unit s internal mechanism if immediate first aid is not accessible Disconnect the power cord from the unit before adding or removing any components Operating the unit in the presence of flammable gases or fumes is extremely hazardous Do not perform any operating or maintenance procedure that is not described in the user s manual Some of the unit s capacitors can be charged even when the unit is not connected to the power source If the equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Page 7 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Safety Symbols
36. oved Return Material Authorization RMA has been issued by JDS Uniphase sales personnel This number must be obtained prior to shipping any material to JDS Uniphase The owner s name and address the model number and full serial number of the unit the RMA number the original JDSU sales order number the 10112341 Rev 002 Page 19 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL invoice number and an itemized statement of claimed defects must be included with the return material Ship return material in the original shipping container and packing material If these are not available packaging guidelines are as follows 1 Cover the front panel with foam to prevent damage 2 Wrap the unit in anti static packaging Use anti static connector covers 3 Pack the unit in a reliable shipping container 4 Use enough shock absorbing material 10 to 15 cm to cushion the unit and prevent it from moving inside the container Pink poly anti static foam is the best material 5 Seal the shipping container securely 6 Clearly mark FRAGILE on its surface 7 Always provide the model and serial number of the unit and if necessary the RMA number on any accompanying documentation 8 In order to ship the unit please contact the JDS RMA department at 613 727 1303 Cleaning Connectors Caution e Connecting damaged or dirty fibers to the unit can damage the connectors on the unit e Never force an optical conn
37. ower measurements to 80 dBm for single mode model 60 dBm for multi mode model Convenient foot pedal for data logging MCTS application software Built in light sources at 850 980 1310 1480 1550 1625 or 1650 nm Compensation for extraneous backreflection for accurate backreflection measurements 10112341 Rev 002 Page 13 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL User calibration mode RS232 serial and IEEE 488 GPIB parallel interface Convenient data logging via serial port to a computer or serial printer Direct display of measured backreflection power or insertion loss Applications e Connector backreflection and loss testing Component testing e Installation verification e Quality assurance QA acceptance testing Standard Accessories AC power cord country specific Laser sources specified when ordered FC PC FC APC or SC PC SC APC hybrid measurement jumper FC PC FC APC or SC PC SC APC hybrid calibrated jumper FC type or SC type detector adapter Detector cap Foot pedal MCTS software and user s manual User s manual Carrying case for field use Certificate of Compliance NIST Traceability Report available on request Optional Accessories e Variety of detector adapters e Measurement jumpers with various user selected connectors e RS232 to GPIB converter 10112341 Rev 002 Page 14 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL S
38. pecifications The following optical specifications describe the warranted characteristics of the unit Table 3 Supplementary specifications describe the typical non warranted performance of the unit Table 4 Table 3 Optical Specifications Parameter Specification Single mode Operating wavelength 980 1310 1480 1550 850 1310 nm 1625 or 1650 10 nm 420 nm Fiber Type 9 125 single mode 50 125 62 5 125 um 5 125 Flexcor 1060 multimode for the 980 nm Detector type 2 mm diameter InGaAs 3 mm diameter InGaAs Range backreflection 0 to 75 dB 0 to 40 dB power 0 to 80 dBm 3 to 60 dBm Absolute accuracy backreflection 1 0 power 0 25 dBm typical at 10 0 25 dBm typical at 10 6 Relative accuracy backreflection 0 4 dB 0 7 dB power 0 05 dB lt 5 dB 0 15 dB gt 5 dB loss Output connector type Panel mounted low backreflection APC Remote interface RS232 or IEEE 488 GPIB Reduced backreflection accuracy in the last 10dB of range based on termination effectiveness Depending on the measurement setup measurements with lower levels are possible at reduced accuracy User calibration supported For a typical application add 0 4 dB for readings between 60 and 67 dB Add 0 8 dB for readings between 67 and 72 dB Add 1 5 dB for readings between 72 and 75 dB Following the user calibration procedure at the recommended interval For simple reflecti
39. r of the DUT and connect the two connectors Connect the output connector of the DUT to the detector on the front of the meter The meter displays the loss due to the DUT Figure 9 4 Press the key to measure and display the loss at another wavelength 10112341 Rev 002 Page 29 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL P 0 15 dB Figure 9 Measuring Relative Power Power Accuracy The absolute accuracy of power measurements made with the RM meter is dependent on the power level to be measured The RM meter does not measure power levels below 50 dBm unless the dark signal from extraneous sources lp is stored To ensure accurate power measurements below 65 dBm store Ip frequently The value of Ip can change with temperature fluctuations Data Logging Using the Foot Pedal The RM meter is supplied with a foot pedal for convenient data logging to either a computer or printer Data logging operates at a baud rate of 2400 To use the foot pedal 1 Ensure the computer or printer is connected to the RS232C or IEEE 488 GPIB port at the back of the meter 2 If the foot pedal is not already operational connect the foot pedal plug to the Log jack on the rear panel of the meter 3 Press the foot pedal The message Log appears on the right hand side of the front panel display and the most recent measurements made are sent to the computer or printer through the RS232 serial or
40. ring Backreflection for Single mode 980 nm only and Multimode Backreflection Measurements Setting Up the Meter for Backreflection Measurements To prepare the meter for backreflection measurements 1 2 Ensure that the meter is powered off Set the power switch to ON and allow the meter to stabilize Press the BR key to set the meter to Backreflection mode which is displayed as BR on the meter Clean the output port on the front of the meter and the APC connector green boot of the measurement jumper and connect this end of the jumper to the output port Ensure that you are using the measurement jumper and not the calibration jumper which is labeled as such The output connector of the measurement jumper is user selected and must be compatible with the input connector of the DUT For each wavelength at which measurements are to be made 5 Press the A key to select the required wavelength 10112341 Rev 002 Page 25 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL 6 Terminate the measurement jumper just before the output connector and hold the termination point steady figure 5a for single mode except 980nm and figure 5b for single mode 980nm and multimode NOTE The termination technique is different depending on the type of the RM Meter used single mode except 980 nm single mode 980nm or multimode Please refer to the Termination Techniques section above 7 Press t
41. rs The RM meter is supplied with a hybrid measurement jumper and a hybrid calibrated jumper The measurement jumper has an APC connector at the input end The other end on the standard measurement jumper is PC but by changing measurement jumpers this end is user selected to be compatible with the input connector of the DUT The calibrated jumper has an APC connector at the input end and a PC connector at the output end Use the measurement jumper for measurement purposes only use the calibrated jumper for calibration purposes only The calibrated jumper has a label attached to it identifying it as the calibrated jumper Coherence Length Reflected light from multiple reflections can change the backreflection measured by the RM meter This variation typically shows up as noise or drift in the signal The internal light source is designed to have low coherence length typically less than 10 cm Thus interference effects are typically seen only between very closely spaced components such as non contacting connectors Electrical Requirements The RM meter is supplied with a rechargeable battery When fully charged the battery provides up to eight hours of operation at room temperature For laboratory use use the RM meter with the power cord The letter B is shown on the RM meter front panel display when the battery power is low Key Features e Backreflection measurements to 75 dB for single mode model 40 dB for multi mode model P
42. surement procedures described at the end of the Measuring Backreflection section Reflections Before the DUT When a device is connected to the RM meter the reflections from the connectors affect the backreflection reading The front panel FC PC connections must have backreflection levels lower than 45 dB for single mode 25 dB for multi mode and FC APC connections must have backreflection levels lower than 60 dB for single mode 40 dB for multi mode To ensure that the RM meter automatically compensates for this backreflection follow the setup procedure described in the Setting Up the Meter for Backreflection Measurements section and ensure that the backreflections do not change from the time of the setup Reflections After the DUT When making a backreflection measurement the fiber after the DUT must be terminated to eliminate the reflections from the end of the fiber see the Termination Techniques section For greatest accuracy when making very low backreflection measurements terminate near the DUT to eliminate reflections from the fiber itself Front Panel Connectors Follow the maintenance procedure described in the Maintaining the Meter section to ensure that the internal pigtail connectors are clean and properly connected to the front panel mating sleeve Connector Loss and Backreflection Ensure that the loss and backreflection of all the connectors are low and stable complying with the connector specificati
43. tch the value measured by the power meter to within 0 3 dBm If the values do not match to within 0 3 dBm adjust the value of User CAL 1 Use screwdriver or an appropriately narrow object to press CAL The last User CAL value stored is displayed on the meter 2 Press and hold the Store Ip key to scroll to the required value in 0 01 dBm increments 3 Press the CAL key to store the User CAL value and return the meter to the power measurement display 4 Repeat the calibration adjustment procedure steps 1 to 3 for the second wavelength Maintaining the Meter Caution Devices with malfunctioning lasers must be returned to the manufacturer for repair Cleaning the Unit 1 Unplug the unit from the line power 2 Clean the enclosure with a damp cloth 3 DO NOT plug the unit back until it is completely dry Cleaning the Connector Ends Clean all connector ends with a lint free tissue and alcohol before every mating See the Cleaning Connectors section 1 Loosen the retaining screws of the connector panel and remove the panel carefully to access the internal connectors Figure 10 10112341 Rev 002 Page 33 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL 4 JDS Uniphase alal OE Figure 10 Removing the Connector Panel unscrew panel and pull out gently 2 Remove the connector from the mating sleeve in the panel 3 Clean the connector endfaces and mating
44. ter for Loss and Power Measurements section 1 Press the Power key to set the meter to Power mode 2 Press the A key to select the wavelength at which the measurement is to be done 3 Clean the output connector of the measurement jumper and the input connector of the DUT and connect the two connectors 10112341 Rev 002 Page 28 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL 4 Connect the output connector of the DUT to the detector on the front of the meter The detector must be equipped with the appropriate detector adapter The RM meter displays the DUT absolute power output Figure 8 5 If a measurement is to be made at a second wavelength repeat steps 2 to 4 Figure 8 Measuring Absolute Power Measuring Relative Power Insertion Loss The value for relative power is the negative value of the insertion loss for example 31 dB instead of 31 dB Relative power is displayed by the meter in dB To make a relative power measurement of a DUT after performing the setup steps in the Setting Up the Meter for Loss and Power Measurements section 1 Press the Power key to set the meter to Relative Power mode In Relative Power mode the meter displays P at the beginning of the reading and rel at the end for example P 0 15 dB rel 2 Press the key to select the wavelength at which the measurement is to be made 3 Clean the output connector of the measurement jumper and the input connecto
45. time the RM meter to a power source and then set the power switch to ON The BR measurement is Follow the setup and measurement approaching the range limit techniques described in the Setting of the RM meter Up the Meter for Backreflection Measurements and Measuring Backreflection sections Battery is running low Connect the RM meter to the a power supply using the cord provided BR range is very limited Follow the setup and measurement techniques described in the Setting Up the Meter for Backreflection Measurements and Measuring Backreflection sections TOO MUCH LIGHT lp value is too high Attach the detector cap to the detector and press the lp key INPUT LOW Laser power is too low Check the measurement setup for an external source that entered into the output INPUT HIGH Laser power is too high Check the measurement setup for an external source that entered into the output 10112341 Rev 002 Page 36 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Programming Guide RS232 Serial Interface The RM meter is equipped with an RS232 serial interface Through the RS232 connection the user can download measured values of backreflection loss and power to a computer or printer The RM meter can also use an IEEE 488 parallel interface through the external RS232 to IEEE 488 converter described in the RS232 GPIB Converter section The RS232 serial interface is configured as data t
46. y of backreflection loss and power measurements Use only the calibrated jumper for all calibration procedures 10112341 Rev 002 Page 31 of 39 4 JDS Uniphase RM3 SERIES BACKREFLECTION METER USER S MANUAL Backreflection Calibration Adjustment The RM meter has a factory set backreflection calibration value User CAL that compensates for the typical loss resulting from a connection to the front panel FC APC connector This value appears in the Inspection Report see the Customized Features and Test Data section To perform a backreflection calibration adjustment 1 Press the BR key to set the RM meter to Backreflection mode which is displayed as BR on the meter 2 Clean and connect the APC connector green boot of the calibrated jumper to the output port of the RM meter 3 Press the key to select the wavelength at which the calibration check is to be performed Choose either wavelength as you will check both 4 Clean the output connector of the calibrated jumper The backreflection value is displayed The value displayed on the RM meter must match the reference value that appears in the inspection report and on the label of the calibrated jumper If these values do not match ensure that the FC APC connector is properly connected to the RM meter and clean all the connectors If the values still do not match to within 0 3 dB adjust the value of User CAL The CAL key is located on the rear panel of the RM meter
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