HP 81536A User's Manual
Contents
1. D 2 HP 81536A Performance Tests Test Failure If the HP81536A 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 81536A can be tested Appendix C also lists some supplemental characteristics of the HP 815364 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 Performance Test 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 cabies from the 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 HP 81535A Performance Tests D 3 Accuracy and Linearity Test Specifica2. E0590 lst December 1990 81536 90611 E1290 Edition 2 Ist April 1992 81536 90011 E0492 lst March 1993 81536 9001 E0393 Ist December 1994 81536 90011 E1294 lst July 1996 81536 90011 E9796 Exclusive Remedies The remedies provided herein are Buyer s sole and exclusive remedies Hewlett Packard shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Certification Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology NIST formerly the United States National Bureau of Standards NBS to the extent allowed by the Institutes s calibration facility and to the calibration facilities of other International Standards Organization members ISO 9001 Certification Produced to ISO 9001 international quality system standard as part of our objective of continually increasing customer satisfaction through improved process control Safety Considerations Before operation you
3. 7 4 Disp Ref OdBm 20dBm 27 4 Disp Ref 30dBm 5 18 HP 81536A Performance Tests Page 3 of 4 Date imum Measurement Uncertainty 10 284W 2 10 28uW 2 dB R2 Performance Test for the HP 81536A Page 4 of 4 Model HP 81536A Sensor Module Date s Minimum mar PP Measurement Test Description Spec Result Spec Uncertainty Non Linearity Range Formula OdBm R1 R2 0 015dB dB 0 015dB 0 006dB 10dBm R1 0 015dB dB 0 015dB 0 006dB 20dBm 0 000dB 10 004 30dBm R3 0 015dB aB 0 0154B 0 006dB HI Noise Test DW lt 50pW HP 81536A Performance Tests B 11 5 S E A Cleaning Procedures The Cleaning Kit A full cleaning kit contains the following items Isopropyl alcohol This is usually available from pharmaceutical suppliers 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 adapt
4. 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 With 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 photographie 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 Before you make any connection you must ensure that all cables and Connections connectors are clean If they are dirt
5. vary by 1 count Information on the traceability of power meters is available on request I at the following reference conditions a Power level 10uW 20dBm Continuous Wave CW a Fiber 50um graded index NA 0 2 fully excited C 2 HP 815364 Specifications m Ambient temperature 23 C 5K m Connector Diamond HMS 10 HP s At day of calibration add 0 3 for aging over one year add 0 6 over two years R Spectral width of source lt 10nm 2 at the following operating conditions m Fiber lt 50um NA lt 0 2 m For NA gt 0 2 add 1 u Ambient temperature 0 to 55 C non condensing Within 1 year after calibration add 0 34 for second year m For Biconic Connector add 41 Supplementary Performance Characteristics S Add 1 to total uncertainty for the full wavelength range w 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 81536A Specifications C 3 Se 3 HP 81536A Performance Tests Introduction The procedures in this section test the performance of the instrument The complete specifications to which the HP 815364 is tested are given in Appendix C AH tests can be performed without access to the interior of th
6. 10dBm 10dBm 7 4 OdBm 20dBm 27 4 30dBm Max imum Measurement Result Spec Uncertainty dB 0 004 R1 0 008 R2 0 008 R3 Example Calculated Results for the Linearity Test Test No Test Description Non Linearity Range Formula OdBm R1 R2 10dBm 20dBm 30dBm Maximum Measurement Result Spec Uncertainty 0 012dB 0 015dB 0 006dB 0 004dB 0 015dB 0 006dB 0 000dB 0 00 0 008dB 0 015dB 0 006dB Shown graphically these results look as shown in the following figure D 6 HP 81536A Performance Tests a RANGE Bd Bm 1BdBm 2BdBm 38 dBm Jp ap A 1 50 B rn nn ee ns oe RI O nae R3 R2 l We ati a pn 1 GdB nuno ne ee Figure D 2 Addition of results example HI Noise Test Note The noise measurement must be performed with either a y module or a blank panel in the second channel position a Connect the equipment as shown in Figure D 1 Disable the HP 81564 output m On the DUT select AUTOranging and display in Watts Set the averaging time to Is w Press Zero w Select the MENU mode m Press Record to select Stability a Press and select the T TOTAL parameter Set T_TOTAL to 1 minute m Press Edit and then to run the noise measurement When the test has completed press to select the SHOW application Press and then Next Prev to display the DIFF result a Note the DI
7. FF result as the noise value in the test record HP 81536A Performance Tests D 7 P Performance Test for the HP 81536A Page 1 of 4 Test Facility Report No Date Customer Tested By Model HP81536A Sensor Module Serial No mem Ambient temperature C Options Relative humidity Firmware Rev Line frequency Hz Special Notes B 8 HP 81536A Performance Tests Performance Test for the HP 81536A Test Equipment Used Aal Aa2 4b 12 13 14 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 81553SM HP 815545M Page 2 of 4 D a Trace No Cal Due Date HP 8156A Option 101 HP 8153A HP 8100041 HP 81000AA HP 81101AC N A N A N A N A N A N A rren ree ener rener re I ranar o E E E E EEE ee aosan anaana amta mai aai ii FLL E e eaaa HP 81536A Performance Tests D 3 Performance Test for the HP 81536A Model HP 81536A Sensor Module No ee Mamimi O Maxi Test Description Spec Ket Spec a Accuracy Test measured at nm Output Power j9 72gYY measured at nm Output Power 9 724 W H Linearity Test Range Power dBm 20dBm 17 4 Disp Ref 10dBm l0dBm
8. P 81564 output is disabled ZERO the DUT 6 Connect the HP 8156A output cable to the standard head and ZERO the standard meter Enable the HP 81564 output Change the HP 81564 attenuation until the power meter standard displays 10 00uW Connect the attenuator output cable to the DUT Check the DUT display and note the result in the test record Repeat steps 1 to 5 at the second wavelength with the corresponding source H Linearity Test 1 2 da S QD Q Make sure that the HP 81564 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 dB Press to select the 10dBm range Note the deviation displayed in dB as Ri 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 dB d Select the OdBm range e Note the deviation displayed in dB as R2 on the test record HP 81536A Performance Tests 0 5 D test record 8 Repeat the steps a to e at the all the range and level settings shown in the 9 Calculate the non linearity using the formulae in the test record Example Results for the Linearity test Test No Test Description H Linearity Test Range Power dBm 20dBm 17 4
9. User s Guide HP 81536A Sensor Module SERIAL NUMBERS This manual applies to all instruments _ I HEWLETT CA PACKARD HP Part No 81536 90011 Printed in Germany Second Edition E0796 This document contains proprietary information that is protected by copyright AR rights are reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of Hewlett Packard GmbH Copyright 1996 by Hewlett Packard GmbH Herrenberger Str 130 71034 Boeblingen Germany Subject Matter The information in this document is subject to change without notice Hewlett Packard makes no warranty ofany kind with regard to this printed material including but not limited ta the implied warranties of merchantability and fitness for a particular purpose Hewlett Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material Printing History New editions are complete revisions of the guide reflecting alterations in the functionality of the instrument Updates are occasionally made to the guide between editions The date on the title page changes when an updated guide is published To find cut the current revision of the guide or to purchase an updated guide contact your Hewlett Packard representative Notices Warranty This Hewlett Packard inst
10. 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 1 Moisten a new cotton swab with isopropy 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 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 1 Clean the adapter by rubbing a new dry cotton swab over the surface using Procedure a small circular movement 2 Blow away any
11. d 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
12. e instrument The test equipment given EEE to tests carried out vvith 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 HP 81536A Performance Tests D 1 Instrumenti Accessory Povver Meter Standard C01 Multimeter Mainframe CW Laser Sources Optical Attenuator Connector Adapter head Connector Interface Singlemode Fiber Plastic Cap Test Record Recommended Model Required Characteristics HP 8153A Mainframe with Uncertainty HP 81533A Optical Head 1 5 Interface Module with HP 81524A Optical Head HP 8153A HP 81552SM and HP 815535M or Wavelength HP 815545M Uncertainty 1 nm HP 8156A Option 101 HP 81000A A HP 81000AI 4ea 08154 61701 HP 81101AC 2ea 5040 9351 2ea 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 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
13. ers the diameter of the cotton swab is important Cotton swabs for babies normally have a smaller diameter Caution a Do not use foam swabs as these can leave filmy deposits on the surface you are cleaning l a 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 device 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 p clean dry air If you do not it can lead to filmy deposits or scratches S When using compressed air from a can s Hold the can
14. g Connectors void ak go dh OS Se N DR Bd La v 4 Cleaning Instrument Housings 2 4 E 4 Cleaning Procedures i E 5 Cleaning Cable Connectors 2 e E 5 Cleaning Connector Adapters i E 6 Cleaning Connector Interfaces ee as E 6 How to clean instruments with a recessed lens interface se e E 7 TAS AN Go ro e os es E 7 HG E Ae RE N de DD a E 7 Index Contents 7 Figures D 1 Accuracy and Linearity Test Setup ia D 2 Addition of results example Gontents 2 A a ros ana 4 iva HP 815364 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 81536A Specifications C 1 HP 81536A Specifications 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 50pW 1000 1650nm Linearity 18 C to 28 C const temp 0 015dB 430pW OC to 55 C const temp 0 05dB 50pW Noise _ lt 50pW 1200 1600nm peak peak avg time I sec Recalibration period The display may
15. ic discharge Opening the instrument can cause damage to sensitive components and in addition your warranty will be voided Ed Cleaning Procedures Cleaning Procedures 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 8um 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 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 Hoid 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
16. opy alcoho 4 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 6 Blow away any remaining lint with compressed air LA a 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 rubbing 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 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 remove
17. remaining lint with compressed air Procedure for Use this procedure particularly when there is greasy dirt on the adapter Stubborn Dirt 2 ere Moisten a new cotton swab with isopropyl alcohol Clean the adapter 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 Do ma Cleaning Connector Interfaces Caution a Be careful when using pipe cleaners as the core and the bristles of the pipe cleaner are hard and can damage the interface E Do not use pipe cleaners on optical head adapters as the hard core of normal pipe cleaners can damage the bottom of an adapter Preferred 1 Clean the interface by pushing and pulling a new dry pipe cleaner into the Procedure opening Rotate the pipe cleaner slowly as you do this 2 Then clean the interface by rubbing a new dry cotton swab over the surface using a small circular movement 3 Blow away any remaining lint with compressed air Procedur for Use this procedure particularly when there is greasy dirt on the interface Stubborn Dirt p e 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 3 Moisten a new cotton swab with isopr
18. rument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period HP will at its option either repair or replace products that prove to be defective For warranty service or repair this product must be returned to a service facility designated by HP Buyer shali prepay shipping charges to HP and HP shali pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument software or firmware will be uninterrupted or error free Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance No other warranty is expressed or implied Hewlett Packard specifically disclaims the implied warranties of Merchantability and Fitness for a Particular Purpose Control Serial Number Edition 2 applies directly to ali instruments Edition 1 lst May 1990 81536 90011
19. 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 Warning To avoid hazardous electrical shock do not perform electrical tests when there are signs of shipping damage to Q any portion of the outer enclosure covers panels etc Power Requirements The HP 81536A will operate when installed into the HP 8153A Optical Multimeter mainframe Input Output Signals Caution A maximum of 15V can be applied as an external voltage to any L BNC connectors Contents E ESET SEC TT C HP 81536A Specifications Supplementary Performance Characteristics 0 3 Analog output ep bas Hw E E hn eee a Gerd C 3 D HP 81536A Performance Tests Introduction e e I a D 1 Equipment Required E Bier a ee eee ek Se eS D 1 E a a a cee D 2 Test Failure E EN D 3 Instrument Specification Sie Gb hee aie Pee le Bee a eds BUN D 3 Performance Test HE Et oe Mop sae Sal E NEN ee D 3 Accuracy and Linearity Test Eno CER Ro he SER ths 1 ES Botte oh a s D 4 ao sis ares E qd D 4 I Accuracy Test sino e eS a ES Ge RE e E Ea D 5 H Linearity Test RSA ESSES E A D 5 H Noise Test 655 dia Me hk ae ee we AE ROE We RA DS D 7 E Cleaning Procedures The Cleaning Kit a dd Se bo wf ch de Ge es SE ca a E i Other Cleaning Tools cs ed a aa GE e a N E 3 Preservin
20. tions HP 81536A Uncertainty 42 8441 1000 1650nm Linearity 0 015dB 30pW 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 HP 8156A Attenuator HP 8153A with HP 8100041 Std amp Source Modules Connector Interfacas HP 84153A DUT f SA al ESSE mb m Uae Ha Zal e i a shi C DO O s S i moOnooo i poenona al joesacna OQ ilo 60600 l L Sa a ES A 1 j i D Das QE i P STH HEAD Te ee nenat neo rera Figure D i Accuracy and Linearity Test Setup 3 Turn the instruments on enable the laser source and allovy the instruments to vvarm 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 E range at 104W at both 1300nm and 1550nm DA HP 81536A Performance Tests I Accuracy Test E On both power meters a Set the calibration factor to zero b Set the wavelength to the 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 H
21. 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 Micros ope 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 of the microscope is flexible This helps you to 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
22. y 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 Dust Caps and Be careful when replacing dust caps after use Do not press the bottom of the Shutter Caps 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 lightwave 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 Immersion Oil Where it is possible do not use immersion oil or other index matching and Other Index compounds with your device They are liable to impair and dirty the surface of Matching the device In addition the characteristics of your device can be changed and Compounds 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 electrostat
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