HP 81531A User's Manual
Contents
1. also be used as an abbreviated test procedure if you are already familiar with the test procedures The Test Record can also be used as a permanent record and may be reproduced without written permission from Hewlett Packard Test Failure If the HP815381A fails any performance test return the instrument to the nearest Hewlett Packard Sales Service Office for repair Instrument Specification Specifications are the performance characteristics of the instrument which are certified These specifications listed in Appendix C are the performance standards or limits against which the HP 81531A can be tested Appendix C also lists some supplemental characteristics of the HP 81531A Supplemental characteristics should be considered as additional information Any changes in the specifications due to manufacturing changes design or traceability to the National Institute of Standards and Technology NIST will be covered in a manual change supplement or revised manual Such specifications supercede any that were previously published D 2 Performance Tests Performance Test D The performance test given in this section includes the Accuracy Test the Linearity Test and the Noise Test Perform each step in the order given using the corresponding test equipment Note Make sure that all optical connections of the test setups given i in the procedure are dry and clean DO NOT USE INDEX a MATCHING OIL The optical cables from t2. of the microscope is flexible This helps you to E examine your device closely and from different angles A microscope allows you to determine the type of dirt on your device and its extent Then you can choose the correct cleaning procedure and later to examine the results of cleaning With a microscope you can also determine if your optical device is scratched This is typically available from photographic stores or laboratory suppliers An ultrasonic bath very gently removes greasy and other stubborn dirt from optical devices Only use an ultrasonic bath with isopropyl alcohol as other solvents can damage or dirty your optical device Use water only if you are sure that your optical device will not corrode or be damaged Do not use hot water as this can lead to mechanical stress that can damage your optical device Ensure that your liquid soap has no abrasive properties or perfume in it as these can scratch or damage your optical device Do not use normal washing up liquid as it can leave behind an iridescent film These are available from HP The part number is HP 92193N 80 Wipes per box These are tissues that are moistened with isopropyl alcohol This is typically available from professional photographic stores or laboratory suppliers Polymer film is very gentle on optical surfaces and is particularly good for cleaning extremely sensitive devices such as mirrors This is typically available from laboratory suppliers Wi
3. wavelength of the laser source c Set the instruments into MEAS mode Make sure AUTOranging is off and select the 20dBm range d Set the averaging time to 500ms 2 Make sure that the HP 8156A output is disabled ZERO the DUT 3 Connect the HP 8156A output cable to the standard head and ZERO the standard meter 4 Enable the HP 8156A output Change the HP 8156A attenuation until the power meter standard displays 10 004 W 5 Connect the attenuator output cable to the DUT Check the DUT display and note the result in the test record 6 Repeat steps 1 to 5 at the second wavelength with the corresponding source D 4 Performance Tests II Linearity Test 1 2 ao 0 A Make sure that the HP 8156A output is disabled ZERO the DUT Enable the HP 8156A output On the DUT switch off autoranging and select the 20dBm range Set the display to show results in dBm Alter the attenuation until the DUT displays 17 4dBm Press Disp Ref then 4B Press Up to select the 10dBm range Note the deviation displayed in dB as R1 on the test record a In the 10dBm range Set the display to show results in dBm b Alter the attenuation until the DUT displays 7 4dBm c Press Disp Ref then 4B d Select the OdBm range e Note the deviation displayed in dB as R2 on the test record Repeat the steps a to e at all the range and level settings shown in the test record Calculate the non li
4. 1AC Page 2 of 4 Trace No Cal Due Date N A N A N A N A N A N A D 10 Performance Tests Performance Test for the HP 81531A Page 3 of 4 D Model HP 81531A Sensor Module No Date Test Minimum Maximum Measurement No Test Description Spec Result Spec Uncertainty I Accuracy Test uW measured at nm Output Power 9 724 W 10 284W 2 measured at nm Output Power 9 724 W 10 284 W 2 II Linearity Test dB Range Power dBm 20dBm 17 4 Disp Ref 10dBm Rl1 10dBm 7 4 Disp Ref 0dBm R2 20dBm 27 4 Disp Ref 30dBm R3 30dBm 37 4 Disp Ref 40dBm R4 40dBm 47 4 Disp Ref 50dBm R5 Performance Tests D 11 Performance Test for the HP 81531A Page 4 of 4 Model HP 81531A Sensor Module No o o o Date Test Minimum Maximum Measurement No Test Description Spec Result Spec Uncertainty Non Linearity Range Formula 0dBm R1 R2 0 015dB dB 0 015dB 0 006dB 10dBm R1 0 015dB dB 0 015dB 0 006dB 20dBm 0 000dB 0 00dB 30dBm R3 0 015dB dB 0 0150 B 0 006dB 40dBm R3 R4 0 015dB dB 0 015dB 0 008dB 50dBm R3 R4 R5 0 015dB d BY 0 0150 B 0 010dB III Noise Test pw lt 1 5pw D 12 Performance Tests Cleaning Procedures E The Cleaning Kit A full cleaning kit contains the following items Isopropyl alcohol This is usually available from pharmaceutical supplie
5. 70dBm 18 C to 28 C const temp 0 015dB 1pW 0 C to 55 C const temp 0 05dB 1 5pW Noise peak peak avg time 1sec lt 1 5pW 1200 1600nm Dimensions 75mm H 32mm W 335mm D 2 8 x1 3 x13 2 Weight net 0 6kg 1 3lbs shipping 1kg 2 2Ibs Recalibration period 2 years Warmup time 20 min Information on the traceability of power meters is available on request 1 at the following reference conditions two years Power level 104 W 20dBm Continuous Wave CW Fiber 50um graded index NA 0 2 fully excited Ambient temperature 23 C4 Connector Diamond HMS 10 HP At day of calibration add 0 3 for aging over one year add 0 6 over 5K m Spectral width of source lt 10nm at the following operating conditions m Fiber lt 50um NA lt 0 2 a For NA gt 0 2 add 1 C 2 HP 81531A Specifications a Ambient temperature 0 to 55 C non condensing a Within 1 year after calibration add 0 3 for second year a For Biconic Connector add 1 Supplementary Performance Characteristics a Add 1 to total uncertainty for the full wavelength range m Outside the specified wavelength range the noise increases by up to 5 times the value shown above Analog output Bandwidth gt DC lt 300 to 400Hz depending on range and sensor module Output voltage 0 to 2V into open Output impedance 6000 typical Max input voltage 10V HP 81531A Specifications C 3 Performa
6. User s Guide HP 81531A Sensor Module SERIAL NUMBERS This manual applies to all instruments Ls HEWLETT PACKARD HP Part No 81531 90011 Printed in Germany Second Edition E0796 Control Serial Number Edition 2 applies directly to all instruments Edition 1 lst May 1990 81531 90011 E0590 1st September 1990 81531 90011 E0990 Edition 2 lst September 1991 81531 90011 E0991 1st September 1992 81531 90011 E0992 lst December 1994 81531 90011 E1294 Ist July 1996 81531 90011 E0796 Safety Considerations Before operation you should review the instrument and manual including the red safety page for safety markings and instructions You must follow these to ensure safe operation and to maintain the instrument in safe condition Initial Inspection Inspect the shipping container for damage If there is damage to the container or cushioning you should keep it until you have checked the contents of the shipment for completeness and verified the module both mechanically and electrically The Performance Tests give procedures for checking the operation of the module If the contents are incomplete mechanical damage or defect is apparent or if a moduke does not pass the operator s checks notify the nearest Hewlett Packard office Warning To avoid hazardous electrical shock do not perform b electrical tests when there are signs of shipping damage to any portion of the outer enclosure co
7. bing gently over its surface Then blow away any remaining filaments left by the swab Isopropyl alcohol should only be used if there is fat on the lens In this case choose a new swab and moisten it with alcohol Remove the dirt by gently rotating the swab using light pressure Then select a fresh dry swab to wipe away the alcohol Blow away any remaining filament with compressed air Caution Do not press the swabs too hard onto the optical surface of your device as this may produce scratches and your recessed lens Y could be misaligned Alcohol will dissolve some types of dirt If this then forms a deposit on the edge of the optical input it cannot be removed You should therefore only use alcohol if absolutely necessary Other solvents like Acetone should also not be used as they may damage your optical device and reduce its performance Cleaning Procedures E 7
8. evice Cleaning Procedures E 1 Pipe cleaner This is available from tobacco shops Ensure that the bristles of the pipe cleaner are soft so that they do not scratch your device during cleaning Caution Store your pipe cleaners carefully and never reuse them as dust and dirt from the air or from previous cleaning can scratch and dirty your optical device Compressed Air This is available from laboratory suppliers It is essential that your compressed air is free of dust water and oil Only use clean dry air If you do not it can lead to filmy deposits or scratches When using compressed air from a can m Hold the can upright A slant can cause propellant to escape with the compressed air and dirty your optical device m Spray the first couple of seconds into the air as the first stream of compressed air can contain condensation or propellant Any condensation produces a filmy deposit If you are using compressed air from a can you should select one with a CFC free propellant for the sake of the environment E 2 Cleaning Procedures Other Cleaning Tools To examine devices you also require Microscope Ultrasonic bath Warm water and liquid soap Premoistened cleaning wipes Polymer film Infrared sensor card Lens Cleaning Paper Select a microscope with a magnification range of between 50X and 300X These should be available from photographic stores or laboratory suppliers Ensure that the light source
9. f an adapter Preferred Procedure Procedure for Stubborn Dirt 1 2 3 Clean the interface by pushing and pulling a new dry pipe cleaner into the opening Rotate the pipe cleaner slowly as you do this Then clean the interface by rubbing a new dry cotton swab over the surface using a small circular movement Blow away any remaining lint with compressed air Use this procedure particularly when there is greasy dirt on the interface Moisten a new pipe cleaner with isopropyl alcohol Clean the interface by pushing and pulling the pipe cleaner into the opening Rotate the pipe cleaner slowly as you do this Moisten a new cotton swab with isopropyl alcohol Clean the interface by rubbing the cotton swab over the surface using a small circular movement Using a new dry pipe cleaner and a new dry cotton swab remove the alcohol any dissolved sediment and dust Blow away any remaining lint with compressed air E 6 Cleaning Procedures How to clean instruments with a recessed lens interface Light dirt If you find any particles of dirt on the fixed connector interface or on the input of the optical block clean them with compressed air This cleaning method is gentle to your optical device and is an ideal approach if there is no fat on the surface of your device Heavy dirt Using compressed air blow away larger particles of dirt Clean the recessed lens interface with a dry cotton swab by rub
10. he laser source to and from the HP 8156A Attenuator to the power meter must be fixed on the table to ensure minimum cable movement during the tests Accuracy and Linearity Test Specifications HP 81531A Uncertainty 2 8 1000 1650nm Linearity 0 015dB 1pW t includes aging Test Setup 1 Make sure that cable connector detectors and adapters are clean 2 Connect the equipment as shown in Figure D 1 Ensure that the cables to and from the attenuator are fixed on the table and that both the optical head and the DUT are close together so that minimum cable movement is required when connecting the cable to the head or to the DUT Performance Tests D 3 HP 8156A Attenuator HP 8153A with HP 81000Al Std amp Source Modules Connector Interfaces HP 8153A DUT o o popoonooDoOoOoO O O oagaagagag oaoaoaoog pOoDoOoOoCco poOoDgOoOoOo Ne OOoooooo o J STD HEAD Figure D 1 Accuracy and Linearity Test Setup 3 Turn the instruments on enable the laser source and allow the instruments to warm up for at least 20 minutes Note The linearity test must only be performed at either 1300nm or i 1550nm The accuracy test must be performed in the 20dBm Y range at 104 W at both 1300nm and 1550nm I Accuracy Test 1 On both power meters a Set the calibration factor to zero b Set the wavelength to the
11. nce Tests Introduction The procedures in this section test the performance of the instrument The complete specifications to which the HP 81531A is tested are given in Appendix C All tests can be performed without access to the interior of the instrument The test equipment given corresponds to tests carried out with Diamond HMS 10 HP conectors Equipment Required Equipment required for the performance test is listed in the table below Any equipment which satisfies the critical specifications of the equipment given in the table may be substituted for the recommended models Instrument Accessory Recommended Model Required Characteristics Power Meter Standard HP 8153A Mainframe with Uncertainty C01 HP 81533A Optical Head 1 5 Interface Module with HP 81524A Optical Head Multimeter Mainframe HP 8153A CW Laser Sources HP 81552SM and HP 81553SM or Wavelength HP 815548M Uncertainty 1 5nm Optical Attenuator HP 8156 Option 101 Connector Adapter head HP 81000AA Connector Interface HP 81000AI 4ea 08154 61701 Singlemode Fiber HP 81101AC 2ea Plastic Cap 5040 9351 2ea Performance Tests D 1 Test Record Results of the performance test may be tabulated on the Test Record provided at the end of the test procedures It is recommended that you fill out the Test Record and refer to it while doing the test Since the test limits and setup information are printed on the Test Record for easy reference the record can
12. nearity using the formulae in the test record Performance Tests D 5 Example Results for the Linearity test D Test Minimum Maximum Measurement No Test Description Spec Result Spec Uncertainty II Linearity Test dB Range Power dBm 20dBm 17 4 Disp Ref 10dBm 0 004 Rl 10dBm 7 4 Disp Ref 0dBm 0 008 R2 20dBm 27 4 Disp Ref 30dBm 0 008 R3 30dBm 37 4 Disp Ref 40dBm 0 004 R4 40dBm 47 4 Disp Ref 50dBm 0 02 R5 D 6 Performance Tests Example Calculated Results for the Linearity Test Test Minimum Maximum Measurement No Test Description Spec Result Spec Uncertainty Non Linearity Range Formula 0dBm R1 R2 0 015dB 0 004dB 0 015dB 0 006dB 10dBm R1 0 015dB 0 004dB 0 015dB 0 006dB 20dBm 0 000dB 0 00dB 30dBm R3 0 015dB 0 008dB 0 015dB 0 006dB 40dBm R3 R4 0 015dB 0 012dB 0 015dB 0 008dB 50dBm R3 R4 R5 0 015dB 0 008dB 0 015dB 0 010dB Shown graphically these results look as shown in the following figure q RANGE gt d Brn 1 dBr 2 d Bm 38d Bm 4 d Br S d Bm 0 015dB 5 0 D15B z Figure D 2 Addition of results example Performance Tests D 7 III Noise Test Note The noise measurement must be performed with either a i module or a blank panel in the second channel position Y Connect the equipmen
13. ng Tools 2 E 3 Preserving Connectors 2 6 ee e a e a a e E 4 Cleaning Instrument Housings E 4 Correct Cleaning Procedure 0 0084 E 5 Cleaning Cable Connectors ee E 5 Cleaning Connector Adapters 2 484 E 6 Cleaning Connector Interfaces Pe Bs E 6 How to clean instruments yitharecssed iene interface fe E 7 ETSht die ritea A Ge e Be ee Pe E 7 Heavy dirt fs amp tee ao Se Be i oe ee ete Get Gi T E 7 Index Contents 1 Figures D 1 Accuracy and Linearity Test Setup 00282 D 2 Addition of results example Contents 2 HP 81531A Specifications Specifications describe the instrument s warranted performance Supplementary performance characteristics describe the instrument s non warranted typical performance Because of the modular nature of the instrument these performance specifications apply only to this module You should insert these pages into the appropriate section of the manual HP 81531A Specifications C 1 HP 81531A Specifications Sensor Element In GaAs Wavelength range 800 1700nm Power range 3 to 90dBm Display resolution dBm dB 0 001 0 0001 on printout Watt 0 01 to 10 depending on power range Applicable fiber type 9 125um 100 140um NA lt 0 3 Uncertainty Accuracy 2 5 1000 1650nm Total Uncertainty 5 1 5pW 1000 1650nm Linearity 0 to
14. rs or chemists Cotton swabs Soft tissues If possible use alcohol supplied for medical purposes rather than impure alcohol or alcohol with additives Caution Do not use other solvents as some can damage plastic materials and claddings For example Acetone dissolves the adhesives used in fiber optic devices Warning Never drink this alcohol as this can lead to blindness or other serious damage to your health Use swabs such as Q tips or other cotton swabs These are typically available from local distributors of medical or hygiene products such as supermarkets or pharmacies Note If you are cleaning connector interfaces or adapters the diameter of the cotton swab is important Cotton swabs for babies normally have a smaller diameter Caution m Do not use foam swabs as these can leave filmy deposits on the surface you are cleaning m Store your cotton swabs carefully and never reuse them Dust and dirt from the air or from previous cleaning can scratch or dirty your optical device These are available from most stores and distributors of medical and hygiene products such as supermarkets or pharmacies Use multi layer tissues made from non recycled cellulose These are more absorbent and softer than other types and they do not scratch the surface of your device Caution Store your soft tissues carefully and never reuse them as dust and dirt from the air or from previous cleaning can scratch and dirty your optical d
15. t as shown in Figure D 1 Disable the HP 8156A output On the DUT select AUTOranging and display in Watts Set the averaging time to Is Press Zero Select the MENU mode Press Record to select Stability Press Edit and select the T_TOTAL parameter Set T_TOTAL to 1 minute Press Edit and then Exec to run the noise measurement When the test has completed press More to select the SHOW application Press Edit and then Next Prev to display the DIFF result Note the DIFF result as the noise value in the test record D 8 Performance Tests Performance Test for the HP 81531A Pagelof4 P Test Facility Report No Date Customer Tested By Model HP81531A Sensor Module Serial No Ambient temperature _ C Options Relative humidity _ Firmware Rev Line frequency o Hz Special Notes Performance Tests D 9 D Performance Test for the HP 81531A Test Equipment Used Aal 4a2 4b 12 13 14 15 16 17 18 Description Lightwave Multimeter Std Opt Head Interface Module Optical Head CW Laser Source CW Laser Source CW Laser Source Optical Attenuator Lightwave Multimeter DUT Connector Interface Connector Adapter Singlemode Fiber 2ea Model No HP 8153A HP 81533A HP 81524A HP 81552SM HP 815535M HP 81554SM HP 8156A Opt 101 HP 8153A HP 81000AI HP 81000AA HP 8110
16. th this card you can qualitatively check the uniformity of your emitted laser light because when the laser light is projected onto the sensor card it becomes visible Some lens cleaning papers and cleaning kits available for example in photographic stores are not suitable for cleaning fiber optic devices To be sure please ask the salesperson or the manufacturer Cleaning Procedures E 3 Preserving Connectors Listed below are some hints on how to keep your connectors in the best possible condition Making Connections Dust Caps and Shutter Caps Immersion Oil and Other Index Matching Compounds Before you make any connection you must ensure that all cables and connectors are clean If they are dirty use the appropriate cleaning procedure When inserting the ferrule of a patchcord into a connector or an adapter make sure that the fiber end does not touch the outside of the mating connector or adapter Otherwise you will rub the fiber end against an unsuitable surface producing scratches and dirt deposits on the surface of your fiber Be careful when replacing dust caps after use Do not press the bottom of the cap onto the fiber as any dust in the cap can scratch or dirty your fiber surface When you have finished cleaning put the dust cap back on or close the shutter cap if the equipment is not going to be used immediately Keep the caps on the equipment always when it is not in use All of Hewlett Packard s ligh
17. the bath for at least three minutes 2 Take a new dry soft tissue and remove the alcohol dissolved sediment and dust by rubbing gently over the surface using a small circular movement 3 Blow away any remaining lint with compressed air Cleaning Procedures E 5 Cleaning Connector Adapters Caution Some adapters have an anti reflection coating on the back to reduce back reflection This coating is extremely sensitive to solvents and mechanical abrasion Extra care is needed when cleaning these adapters Preferred Procedure Procedure for Stubborn Dirt 1 2 Clean the adapter by rubbing a new dry cotton swab over the surface using a small circular movement Blow away any remaining lint with compressed air Use this procedure particularly when there is greasy dirt on the adapter Moisten a new cotton swab with isopropyl alcohol 2 Clean the adapter by rubbing the cotton swab over the surface using a small circular movement Take a new dry soft tissue and remove the alcohol dissolved sediment and dust by rubbing gently over the surface using a small circular movement Blow away any remaining lint with compressed air Cleaning Connector Interfaces Caution m Be careful when using pipe cleaners as the core and the bristles of the pipe cleaner are hard and can damage the interface m Do not use pipe cleaners on optical head adapters as the hard core of normal pipe cleaners can damage the bottom o
18. the surface of the connector you may have no option but to polish the connector This depends on the degree of dirtiness or the depth of the scratches This is a difficult procedure and should only be performed by skilled personnel and as a last resort as it wears out your connector Warning Never look into the end of an optical cable that is connected to an active source To assess the projection of the emitted light beam you can use an infrared sensor card Hold the card approximately 5 cm from the output of the connector The invisible emitted light is projected onto the card and becomes visible as a small circular spot Preferred 1 Clean the connector by rubbing a new dry cotton swab over the surface Procedure using a small circular movement 2 Blow away any remaining lint with compressed air Procedure for Use this procedure particularly when there is greasy dirt on the connector Stubborn Dirt ar 1 Moisten a new cotton swab with isopropyl alcohol 2 Clean the connector by rubbing the cotton swab over the surface using a small circular movement 3 Take a new dry soft tissue and remove the alcohol dissolved sediment and dust by rubbing gently over the surface using a small circular movement 4 Blow away any remaining lint with compressed air An Alternative The better more gentle but more expensive cleaning procedure is to use an Procedure ultrasonic bath with isopropyl alcohol 1 Hold the tip of the connector in
19. twave instruments and accessories are shipped with either laser shutter caps or dust caps If you need additional or replacement dust caps contact your Hewlett Packard sales office Where it is possible do not use immersion oil or other index matching compounds with your device They are liable to impair and dirty the surface of the device In addition the characteristics of your device can be changed and your measurement results affected Cleaning Instrument Housings Use a dry and very soft cotton tissue to clean the instrument housing and the keypad Do not open the instruments as there is a danger of electric shock or electrostatic discharge Opening the instrument can cause damage to sensitive components and in addition your warranty will be voided E 4 Cleaning Procedures Correct Cleaning Procedure If you are unsure about the correct cleaning procedure for your device or if you are unsure whether the procedure given here is suitable for your device check with the manufacturer or sales distributor or try the procedure on a dummy or test device first Cleaning Cable Connectors Cleaning connectors is difficult as the core diameter of a singlemode fiber is only about 94m This generally means you cannot see streaks or scratches on the surface To be certain of the condition of the surface of your connector and to check it after cleaning you need a microscope In the case of scratches or of dust that has been burnt onto
20. vers panels etc Power Requirements The HP 81531A operates when installed into the HP 8153A Optical Multimeter mainframe Operating Environment The HP 8153A safety information summarizes the HP 81531A operating environment ranges In order for the HP 81531A to meet specifications the operating environment must be within the limits specified in this section Input Output Signals Caution A maximum of 15V can be applied as an external voltage to any Y BNC connectors Storage and Shipment The module can be stored or shipped at temperatures between 40 C and 70 C The module should be protected from temperature extremes that may cause condensation within it Contents C HP 81531A Specifications Supplementary Performance Characteristics 02 2 2 C 3 Analog Outputs 2h a See Be al Sa ek Oe ae E C 3 D Performance Tests Introduction a Ne Ain ies Gt ihe Se Sea EA D 1 o A A eae ws D 1 TESE RECOFO caunai 4 da ob Se Be ea ae ene A D 2 Test Failure A O A E 8 is wad ah te D 2 Instrument Speden Be G te a WA i HE E a tes eer ae D 2 Performance Test D 3 Accuracy and Linearity Test 2 2 en D 3 PESHDCUUP A id ha eee eM oy ee es i eo ed sin ye D 3 TsAccuracy Test La honk ec se ee a aa D 4 II Linearity Test 2 2 an e o o D 5 NOISE TESI lord gay Ace Gh a Agee at det Gee ete ot pee A D 8 E Cleaning Procedures The Cleaning Kites Ps ee 88 Ok a A E en x E 1 Other Cleani
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