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Keysight Agilent HP 83485A Datasheet

1. Atten units dB ratio Attenuation Units Volt Watt Ampere Unknown Calibrate Skew Cal Status off on Calibrate Probe chanmen Figure 2 2 Electrical Channel Setup menu Displaying the Channel Setup menus To display the optical Channel Setup menu press the optical Channel key 2 4 Key Path Channel Setup Menu To display the electrical Channel Setup menu press the electrical key Display The Display function turns the channel display off and on When the channel display is on a waveform is displayed for that channel unless the offset is adjusted so the waveform is clipped off of the display The channel number vertical scaling and offset are displayed at the bottom left of the waveform area They remain on the display until the channel is turned off or an automatic measurement is performed The automatic measurement results share the same area of the display as the channel setups When the channel display is off the waveform display for that channel is turned off pulse parameter measurements are stopped and acquisition on that channel is stopped unless it is needed as an operand for waveform math functions Even though the channel display is off you can still use the plug in as a trigger source or as a function source in the Math menu However the analyzer will not trigger unless one or more of the other channel disp
2. Figure 3 4 Dark calibration menu Channel Skew Calibration This calibration affects both optical and electrical measurements The skew calibration changes the horizontal position of a waveform on the display The skew calibration has a range of approximately 100 us You can use skew to compensate for the differences in cable or probe lengths It also allows you to place the trigger edge at the center of the display when you are using a power splitter connected between the channel and trigger inputs Another use for skew is when you are comparing two waveforms that have a timing difference If you are interested in comparing the shapes of two waveforms rather than the actual timing difference you can use skew to overlay one waveform on top of the other waveform 3 15 To skew two channels Calibration Overview User Calibrations Optical and Electrical Turn both channels on and overlay the signals vertically Expand the time base so that the rising edges are at about a 45 angle Press the plug in module s front panel channel SETUP key Ae Go N ka Press Calibrate and then Skew 5 Adjust the skew on one of the channels so that the rising edges overlap at the 50 points Probe Calibration Probe calibration applies to electrical measurements only For active probes such as the HP 54701A which the instrument can identify through the probe power connector the instrument automatically adju
3. 886 2 712 0404 Australia Hewlett Packard Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 61 3 895 2895 Japan Yokogawa Hewlett Packard Ltd 1 27 15 Yabe Sagamihara Kanagawa 229 Japan 181 427 59 1311 Canada Hewlett Packard Ltd 17500 South Service Road Trans Canada Highway Kirkland Quebec H9J 2X8 Canada 514 697 4232 Singapore Hewlett Packard Singapore Ltd Pte Ltd Alexandra PO Box 87 singapore 9115 65 271 9444 vi Warranty This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by Hewlett Packard Buyer shall prepay shipping charges to Hewlett Packard and Hewlett Packard shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Hewlett Packard from another country Hewlett Packard warrants that its software and firmware designated by Hewlett Packard for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the operation of the instrument or software or firmware wil
4. P I Calibrate Plug in channels measurements such as operating temperature Vp to p eye height changes by more than 2 C extinction ratio and the optical power meter 1 Refer to O E User Wavelength Calibration in this chapter 3 20 Table 3 4 Complete Calibration Summary continued Calibration Overview Calibration What is calibrated Measurements Affected Recommended Interval Key Path Offset Zero Vertical offset is calibrated Channels affected optical Perform a plug in vertical Optical Channel Setup Calibration for the optical channel Any optical vertical calibration in order to meet Calibrate only This calibration measurements including ublished specifications y Thi cucing P P Offset 0 doesn t include vertical Vp to p eye height and Because the offset zero scale accuracy extinction ratio calibration performs only the offset portion of the plug in vertical calibration it should only be used before fast non critical measurements Dark Dark calibration measures Channels affected optical amp Before extinction ratio Shift Meas eye Calibration he channel offset signal electrical Extinction ratio measurements if the vertical Extinction ratio without any light present scale or offset has changed We igi prose nget Dark Cal and this value is used in since the last dark calibration he extinction ratio or after a plug in vertical algorithm calibration is performed Probe Probe Attenuatio Channels
5. User s Guide HP 83485A B Optical Electrical Plug In Module HP part number 83485 90056 Printed in USA June 1999 Notice The information contained in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with regard to this material including but not limited to 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 Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set forth in subparagraph c 1 1 of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and subparagraphs c 1 and c 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 for other agencies Copyright Hewlett Packard Company 1999 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws CAUTION WARNING Safety Symbols The following safety symbols are used throughout this manual Familiarize yourself with each of the symbols and its meaning before operating this instrument The caution sign denotes a hazard to the instrument It calls attention to a procedure which i
6. External Scale Menu 3 19 Complete Calibration Summary Table 3 4 Complete Calibration Summary Calibration What is calibrated Measurements Affected Recommended Interval Key Path Mainframe Accuracy and continuity Channels affected optical amp Annually at HP service center Utility Calibration of the timescale electrical All time base or if operating temp has Calibrate neasurements such as rise changed and remains 5 C or 9 Moie Calibrate frame ime fall time eye width more from calibration and jitter temperature See service manual O E Factory The photodetector Channels affected optical Annual factory re calibration Not user accessible Wavelength responsivity Amplitude accuracy of all of standard wavelengths Calibration optical channel measurements Optical power meter accuracy O E User The photodetector Channels affected optical All Annual re calibration of user Optical Channel Setup Wavelength responsivity optical channel measurements defined non factory Calibrate Calibration at user wavelengths avelengths wave eng wave eng DE Cal Plug i Vertical offset and vertical Channels affected optical amp Perform after any power cycle Utility Vertical scale accuracy for both electrical Any optical or or once every 10 hours Calibrate Calibration electrical and optical electrical vertical during continuous use or if
7. The front panel Probe Power connectors allow automatic channel scaling and probe calibration with HP 54700 series probes The front panel Aux Power connector provides only power to HP 54700 series probes for use as a trigger input Probe calibration and scaling are not required for a trigger input HP 83485A 2488 Mb s OPTICAL ELECTRICAL MODULE SETUP SETUP Optical Channel Electrical Channel Trigger Optical Channel 20 GHz 9 125 um 10 mw MAX Q Figure 1 1 Front panel of the plug in module 54750802 The Instrument at a Glance The HP 83485A B Optical Electrical Plug In Module Getting the best performance To ensure you obtain the specified accuracy you must perform a plug in module vertical calibration The calibration must also be performed when you move a plug in module from one slot to another or from one mainframe to another Refer to Chapter 3 for information on performing a plug in module vertical calibration Installing the plug in module You do not need to turn off the mainframe to install or remove the plug in modules NOTE If you wish to use the HP 83485A B optical plug in module in an HP 547504 digitizing oscilloscope a firmware upgrade must first be installed Order the HP 83480K communications firmware kit and follow the installation instructions CAUTION CAUTION CAUTION The Instrument
8. improve and can degrade performance Hewlett Packard strongly recommends that index matching compounds NOT be applied to their instruments and accessories Some compounds such as gels may be difficult to remove and can contain damaging particulates If you think the use of such compounds is necessary refer to the compound manufacturer for information on application and cleaning procedures Cleaning Accessories Item HP Part Number Isopropyl alcohol 8500 5344 Cotton swabs 8520 0023 Small foam swabs 9300 1223 Compressed dust remover non residue 8500 5262 Inspecting Fiber Optic Cables The Instrument at a Glance Cleaning Connections for Accurate Measurements Dust Caps Provided with Lightwave Instruments Item HP Part Number Laser shutter cap 08145 64521 FC PC dust cap 08154 44102 Biconic dust cap 08154 44105 DIN dust cap 5040 9364 HMS10 HP dust cap 5040 9361 ST dust cap 5040 9366 Consistent measurements with your lightwave equipment are a good indication that you have good connections However you may wish to know the insertion loss and or return loss of your lightwave cables or accessories If you test your cables and accessories for insertion loss and return loss upon receipt and retain the measured data for comparison you will be able to tell in the future if any degradation has occurred Connector or insertion loss is one important performance charact
9. including probes or cable assemblies The instrument calibrates the voltage at the tip of the probe or the cable input 1 Press the plug in module s front panel channel SETUP key 2 Press Calibrate and then Calibrate Probe 1 Connect the voltage probe to the plug in 2 Attach the probe tip to the CAL hook that is located near the floppy disk drive 3 Press the plug in module s front panel channel SETUP key 4 Press Calibrate and then Calibrate probe If the probe being calibrated has an attenuation factor that allows the instrument to adjust the gain in hardware to produce even steps in the vertical scale factors the instrument will do so Typically probes have standard attenuation factors such as divide by 10 divide by 20 or divide by 100 Color grade is enabled Calibrate Current Date 6 AUG 98 15 14 z Current Frame Temp parc Channel 2 Channel 2 Vertical Calibration Status Plug in Model number 83486A Serial number US37200191 Last Calibration 6 AUG 98 08 37 Current Plugin Temp 2 C Comments Figure 3 5 Electrical Channel Calibrate Menu 3 17 To calibrate other devices To adjust the external scale Calibration Overview User Calibrations Optical and Electrical The information in this section applies to both optical and electrical measurements Since the mainframe s CAL signal is a voltage source it cannot be used to calibrate to the probe tip when the
10. or the calibration laboratory personnel an understanding of the various calibration procedures available and how they were intended to be used There is a description of the calibration menu included in the manuals provided with the plug in modules and probes Proper calibration is critical to measurement accuracy and repeatability The HP 54750A 83480A and their associated modules and accessories require that both factory and user calibrations be implemented at the recommended intervals in order to perform measurements at their published specifications This chapter is divided into three sections The first section describes factory calibrations A factory calibration consists of verifying instrument performance to all specifications If an instrument fails to meet specifications adjustment or repair may be necessary For most users this will mean shipping the instrument back to an authorized service center Some users may purchase the required instrumentation and perform the factory timebase calibrations themselves using the optional HP 83480A 54750A Service Guide The second part of the chapter addresses calibrations that are routinely performed by the end user Subsections in each of the two main sections discuss the individual calibrations In addition there will be summary tables at the end of each of these sections summarizing the main areas addressed The third part of the manual consists of a complete calibration summary table at
11. transducer Before multiple channel measurements when measuring timing differences between channels Whenever using external devices component or transducer Calibrate probe Channel Setup Calibrate Skew Channel Setup External Scale O E User Wavelength Calibration This optional optical electrical O E calibration is for optical measurements only It compensates for the photodetector s responsivity The vertical accuracy of all optical channel user wavelength measurements is dependent on proper O E user wavelength calibration O E user wavelength calibrations should be performed annually or whenever a new wavelength is being measured To perform a O E user wavelength calibration a CW optical source with a known optical output power level is required Refer to the specifications for the plug in module for the acceptable power level ranges 3 9 Calibration Overview User Calibrations Optical and Electrical NOTE The optical channel calibration accuracy is heavily dependent on the accuracy to which you know the optical source power For best results measure the optical source power with an optical power meter such as the HP 8153A and use precision optical connectors In addition proper connector cleaning procedures are essential to obtaining an accurate calibration To perform an DIE 1 Press the plug in module s front panel optical channel SETUP key user wavelength 2 Pr
12. External scale softkey 2 9 external trigger input 1 10 level 1 12 Ext gain softkey 2 11 Ext offset softkey 2 11 Index 3 factory calibration 3 4 fiber optic cables cleaning connections 1 13 inspecting 1 14 front panel overview 1 10 horizontal waveform 2 12 index matching compounds 1 13 index matching gel 1 13 input connector 1 13 inspecting cables 1 14 installing the plug in module 1 11 key conventions 1 6 mainframe calibration 3 4 mainframe troubleshooting 5 3 marker value 2 10 math function 2 5 menu overview 1 6 calibration 3 6 cal softkey 2 14 converter calibration 3 15 E user wavelength calibration 3 9 set 2 5 7 2 10 2 14 set softkey 2 7 set zero calibration 3 12 set zero softkey 2 14 ical channel 1 2 2 7 environmental specifications 4 9 HP 83485A specifications 4 4 HP 83485B specifications 4 7 rigger input characteristics 4 10 vertical specifications 4 4 weight 4 9 optical to electrical converter scaling 2 9 optional accessories 1 5 options 1 4 ordering information 1 4 CNO d 2020280000 Index 4 P plug in message 2 14 plug in module description 1 2 features 1 8 front panel 1 10 installation 1 11 purpose 1 8 specifications 4 3 9 troubleshooting 5 4 weight 4 9 plug in module vertical calibration 3 11 power level 2 7 power requirements 4 9 probe attenuation 2 10 2 15 attenuation f
13. Optical and Electrical Channel User Calibration Summary o 3 8 3 3 Miscellaneous User Calibration Summary 3 9 3 4 Complete Calibration Summary 3 20 Contents 3 Contents The Instrument at a Glance The Instrument at a Glance What you ll find in this chapter This chapter describes e options and accessories e the key conventions used in this manual e the front panel rear panel and keys that do not display menus on the screen e lightwave connector care Understanding the information in this chapter will help you successfully operate the instrument CAUTION The input circuits can be damaged by electrostatic discharge ESD Therefore avoid applying static discharges to the front panel input connectors Before connecting any coaxial cable to the connectors momentarily short the center and outer conductors of the cable together Avoid touching the front panel input connectors without first touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge The HP 83485A optical electrical plug in module incorporates two measurement channels one optical and one electrical Each channel has two selectable bandwidth settings In the lower bandwidth modes of 12 4 GHz oscilloscope noise performance is excellent while the 20 GHz mode allows greater fidelity for high speed signals The HP 83485B optical electri
14. be used before fast on critical measurements Dark Dark calibration measures Channels affected optical amp Before extinction ratio Shift Meas eye Calibration the channel offset signal electrical Extinction ratio neasurements if the vertical scale Extinction ratio without any light present or offset has changed since the Dark Cal and this value is used in ast dark calibration or after a the extinction ratio plug in vertical calibration is algorithm performed 3 8 Calibration Overview User Calibrations Optical and Electrical Table 3 3 Miscellaneous User Calibration Summary Calibration What is calibrated Measurements Affected Recommended Interval Key Path Probe Probe Attenuation Channels affected electrical Whenever a probe is Electrical Channel Setup calibration Any electrical measurement connected Calibrate a Channel Skew External Scale Calibra differe between chan for differe cha Compe loss external devices cali es out the small ces in delay els Useful ooking at timing ces between nels sates for gain or associated with brates vertical scale to external device en with the probe Channels affected optical amp electrical Multiple channel neasurements such as Differential TDR Channels affected optical amp electrical Any measurement taken through an external device component or
15. end after cleaning 2 Before cleaning the fiber end clean the ferrules and other parts of the connector 3 Apply isopropyl alcohol to a new clean lint free cotton swab or lens paper 4 Clean the fiber end with the swab or lens paper Move the swab or lens paper back and forth across the fiber end several times Some amount of wiping or mild scrubbing of the fiber end can help remove particles when application of alcohol alone will not remove them This technique can remove or displace particles smaller than one micron 5 Immediately dry the fiber end with a clean dry lint free cotton swab or lens paper 6 Blow across the connector end face from a distance of 6 to 8 inches using filtered dry compressed air Aim the compressed gas at a shallow angle to the fiber end face Nitrogen gas or compressed dust remover can also be used Do not shake tip or invert compressed air canisters because this releases particles in the can into the air Refer to instructions provided on the compressed air canister 7 As soon as the connector is dry connect or cover it for later use CAUTION The Instrument at a Glance Cleaning Connections for Accurate Measurements To clean an adapter 1 Apply isopropyl alcohol to a clean foam swab Cotton swabs can be used as long as no cotton fibers remain after cleaning The foam swabs listed in this section s introduction are small enough to fit into adapters Although foam
16. help resolve the error condition If the suggestions do not eliminate the error message then additional troubleshooting is required that is beyond the scope of this book Refer to the optional HP 83485A B Service Guide and HP 83480A 54750A Service Guide for additional troubleshooting information Additional error messages are listed in the HP 83480A 54750A User s Guide for the mainframe The mainframe could not correctly read the contents of the memory in the plug in 1 Remove and reinstall the plug in module Each time a plug in is installed the mainframe rereads the plug in module s memory Verify the plug in module is firmly seated in the mainframe slot 3 Verify the knurled screws at the bottom of the plug in module are finger tight 4 Install the plug in in a different slot in the mainframe D The mainframe is having trouble communicating with the plug in module Make sure there is a good connection between the mainframe and the plug in module 1 Remove and reinstall the plug in module 2 Verify the plug in module is firmly seated in the mainframe slot 3 Verify the knurled screws at the bottom of the plug in module are finger tight 4 Install the plug in in a different slot in the mainframe 5 6 Communication failure exists at slot E Service is required 1D error occurred in plug in Service is required Cal not possible In Case of Difficulty An illegal hardware state is detected at the mai
17. of the calibrations mentioned in this chapter are performed It is not enough for the instrument to be in the standby setting It must be turned on and running for the entire hour Remote programming commands for calibrations are included in the HP S3480A HP 54750A Programming s Guide Performing calibrations remotely is slightly different than the operation of front panel calibrations 3 3 Factory Calibrations The following calibrations are performed at the factory Mainframe Calibration O E Factory Wavelength Calibration Table 3 1 Factory Calibration Summary Calibration What is calibrated Measurements Affected Recommended Interval Softkey Path Mainframe Calibration O E Factory Wavelength Calibration Accuracy and continuity of the timescale The photodetector responsivity Channels affected optical amp electrical All time base measurements such as rise time fall time eye width and jitter Channels affected optical Amplitude accuracy of all optical channel measurements Optical power meter accuracy Annually at HP service center or if operating temp has changed and remains 5 C or more from calibration temperature See service manual Annual factory re calibration of standard wavelengths Utility Calibrate Calibrate frame Not user accessible 1 Refer to O E User Wavelen th Calibration in this chapter M
18. swabs can leave filmy deposits these deposits are very thin and the risk of other contamination buildup on the inside of adapters greatly outweighs the risk of contamination by foam swabs 2 Clean the adapter with the foam swab 3 Dry the inside of the adapter with a clean dry foam swab 4 Blow through the adapter using filtered dry compressed air Nitrogen gas or compressed dust remover can also be used Do not shake tip or invert compressed air canisters because this releases particles in the can into the air Refer to instructions provided on the compressed air canister To test insertion loss Use an appropriate lightwave source and a compatible lightwave receiver to test insertion loss Examples of test equipment configurations include the following equipment e HP 71450A or 71451A optical spectrum analyzers with Option 002 built in white light source e HP 8702 or 8703 lightwave component analyzer system e HP 3420 lightwave test set with an HP 8510 network analyzer e HP 8153 lightwave multimeter with a source and power sensor module The Instrument at a Glance To test return loss Use an appropriate lightwave source a lightwave receiver and lightwave coupler to test return loss Examples of test equipment configurations include the following equipment e HP 8703 lightwave component analyzer e HP 8702 analyzer with the appropriate source receiver and lightwave coupler e HP 8504 precision reflect
19. units are set to Ampere Watt or Unknown Instead set the external gain and external offset to compensate for the actual characteristics of the probe or device If you do not know the actual characteristics you can refer to the typical specifications that came with the probe or device 1 Press the plug in module s front panel channel SETUP key 2 Press External scale 3 Press Atten units Ratio Attenuation 1 1 and then Units Ampere Volt Watt or Unknown 4 Press Ext gain and enter the actual gain characteristics of the probe or device 5 Press Ext offset and enter the offset introduced by the probe or device External Scale Both optical and electrical channels have an External scale setting which allows the user to enter in an offset value to compensate for gains or losses not associated with the device under test This feature is useful for adjusting out the effects of devices such as test fixtures and attenuators so that the reading on the display gives the measurement value associated with only the actual device under test 1 Press the plug in module s front panel channel SETUP key 2 Press External scale and set the Atten units to decibel 3 Press Attenuation and enter the appropriate values 3 18 Calibration Overview User Calibrations Optical and Electrical Color grade is enabled External Avgs 0 ke Figure 3 6
20. 030 is 155 Mb s STM 1 0C 3 Option 32 is 622 Mb s STM 4 0C 12 Option 34 is 2 488 Gb s STM 16 0C 48 HP 83485B Option 40 is 10 Gb s fourth order filter Option 050 is 10 Gb s fifth order filter Channel Bandwidth Wavelength Filter On Off This function is only available on the optical channel The Wavelength function selects the desired wavelength for calibrated measurements Factory calibrated wavelengths are 1310 nm and 1550 nm A user calibrated wavelength is also available and can be calibrated in the range from 1000 nm to 1600 nm Refer to Chapter 3 for additional information on performing a calibration Bandwidth Wavelength Wavelength 2 8 Key Path Key Path Atten units Channel Setup Menu Channel autoscale The Channel Autoscale function provides a convenient and fast method for determining the standard vertical scale setting with the highest resolution that will not clip the waveform Timebase and trigger settings are not affected This function is useful in manufacturing environments where the timebase and trigger settings remain constant and only the vertical scale needs to be adjusted for signal level variations in multiple DUTS Channel Channel autoscale External scale The External Scale function allows you to setup the analyzer to use external optical to electrical converters or attenuators Scaling is automatically adjusted to account for the external device Channel Externa
21. 2 9 automatic measurement 2 5 auxiliary power connector 1 10 Bandwidth key 2 8 Bandwidth Wavelength softkey 2 7 Bessel Thomson filter 1 2 2 8 Calibrate probe softkey 2 15 Calibrate softkey 2 11 calibration external scale 3 15 factory 3 4 mainframe 3 4 O E 2 14 3 6 O E converters 3 15 O E user wavelength 3 9 offset zero 2 14 3 12 overview 3 2 plug in module vertical calibration 3 11 probe 3 16 probes 3 15 skew 3 15 status 5 5 user 3 7 validity 2 14 vertical 1 11 voltage probe 3 16 CAL signal 2 15 Cal status softkey 2 13 channel Index 2 display 2 5 electrical 1 2 input 1 10 optical 1 2 scale 2 10 setup 2 2 Channel 1 Calibration Status message 2 14 Channel autoscale softkey 2 9 Channel key 2 2 characteristics 4 10 cleaning adapters 1 16 non lensed connectors 1 15 cleaning fiber optic connections 1 13 1 15 connection devices 1 5 connector care 1 13 Current Date message 2 13 Current Frame ATemp message 2 13 customer assistance V decibel calculation 2 9 declaration of conformity 4 10 description of the plug in module 1 2 digital offset 2 7 Display softkey 2 5 electrical channel 1 2 environmental specifications 4 9 HP 83485A vertical specifications 4 3 HP 83485B specifications 4 7 trigger input characteristics 4 10 weight 4 9 environmental specifications 4 9 error messages 5 6 7 extender cables 1 12 external scale calibration 3 15
22. 4 54750A Service Guide or return the mainframe to a qualified service department 5 3 In Case of Difficulty If the plug in 1 does not operate Make the following checks a Is the plug in module firmly seated in the mainframe slot c Are the knurled screws at the bottom of the plug in module finger tight a Is a trigger signal connected to a trigger input a If other equipment cables and connectors are being used with the plug in module are they connected properly and operating correctly c Review the procedure for the test being performed when the problem appeared Are all the settings correct Can the problem be reproduced c Are the connectors clean See Cleaning Connections for Accurate Measurements in Chapter 1 for more information about cleaning the connectors Perform the following procedures O Make sure the instrument is ready to acquire data by pressing Run O Find any signals on the channel inputs by pressing Autoscale o See if any signals are present at the channel inputs by pressing Trigger Sweep freerun After viewing the signal press triggered o Make sure Channel Display is on by pressing Channel Display on off on ci Make sure the channel offset is adjusted so the waveform is not clipped off the display o If you are using the plug in module only as a trigger source make sure at least one other channel is turned on If all of the channels are turned off
23. actor 2 9 characteristics 2 11 power 2 7 power connector 1 10 probe calibration 3 15 3 16 pulse parameter measurements 2 5 H RF connectors 1 11 S safety information iv 1 12 Scale softkey 2 6 shifted function keys 1 6 skew calibration 3 15 Skew softkey 2 12 softkey menu 1 10 overview 1 6 SONET SDH filter 1 2 2 8 specifications 4 7 plug in module 4 3 9 T technical assistance v temperature change 2 13 14 trigger external 1 12 input characteristics 4 10 level 2 10 source 2 5 troubleshooting 5 2 7 Index 5 U V Units softkey 2 6 2 10 user calibrations 3 7 vertical calibration 1 11 measurement 2 10 scale 2 5 6 2 9 specifications 4 3 waveform 2 7 voltage measurement 2 10 probe 2 15 voltage probe calibration 3 16 warranty information vii wattage measurement 2 10 waveform isplay 2 5 horizontal 2 12 Wavelength key 2 8 wavelength settings 2 7 weight of plug in module 4 9 Index 6
24. ading 129 20 LAT 2 reading lt 16 ps lt 30 uW lt 15 pW typical 20 pWidiv 500 pWidiv 1 mW to 3 mW referenced to two divisions above bottom of screen 9 125 jem single mode user selectable connector option 30 dB HMS 10 HP connector Fourth or fifth order Bessel Thomson filter 3 dB frequency 7 465 GHz 1310 nm and 1550 nm 27 dBm to 3 dBm 2 uW to 2 mW 5 of reading 100 nW connector uncertainty 2 of reading 100 nW power meter uncertainty 2 mW 10 mW peak 1000 to 1600 nm 1 It is recommended that a user vertical calibration be performed after every 10 hours of continuous use or if the temperature has changed by greater than 2 C from the previous vertical calibration 2 Where AT represents the temperature change in Celsius from the last user vertical calibration Note that the temperature term goes to zero upon execution of a vertical calibration 4 8 Specifications and Regulatory Information Specifications Environmental specifications Electrical and Optical Channels Temperature Operating 15 C to 35 C Non operating 40 C to 70 C Humidity Operating up to 90 relative humidity non condensing at lt 35 C Non operating up to 95 relative humidity non condensing at lt 65 C Power Requirements Supplied by mainframe Weight Net approximately 1 2 kg 12 6 Ib Shipping approximately 2 1 kg 4 6 I
25. affected electrical Whenever a probe is Electrical Channel Setup calibration Any electrical measurement connected Calibrate aken with the probe P Calibrate probe Channel Skew Calibrates out the small Channels affected optical amp Before multiple channel Channel Setup differences in delay electrical Multiple channel measurements when Calibrate between channels Useful measurements such as measuring timing differences WW GR Skew or looking at timing Differential TDR between channels differences between channels External Scale Compensates for gain or Channels affected optical A Whenever using external Channel Setup oss associated with electrical Any measurement devices component or External Scale external devices aken through an external transducer calibrates vertical scale device component or o external device ransducer 3 21 Calibration Overview Specifications and Regulatory Information Specifications Characteristics Calibration cycle Specifications and Regulatory Information This chapter lists the system specifications and characteristics of the HP 83485A B optical electrical plug in module when it is combined with either the HP 83480A or HP 54750A mainframes The specifications and characteristics for the mainframe are in the HP 834804 54750A User s Guide Specifications a
26. ainframe Calibration Mainframe calibration affects both optical and electrical measurements Mainframe calibration improves timebase accuracy All timebase measurements such as rise time fall time eye width jitter and so forth are affected by the timebase accuracy 3 4 CAUTION CAUTION Calibration Overview Factory Calibrations The calibration factors are stored in the nonvolatile RAM of the instrument There is a switch on the back panel of the instrument that allows the mainframe calibration to be protected or unprotected Next to the switch there is a drawing that shows each switch s function and protected position Refer to the optional AP 83480A 54750A Service Guide for more details about the mainframe calibration and the position of the rear panel memory protect switches To prevent access to the mainframe calibration switch place a sticker over the access hole to this switch Do not attempt a Mainframe calibration without consulting the AP 83480A 547504 Service Guide A mainframe calibration should be performed on a periodic basis annually or when the ambient operating temperature has changed by and remains 5 C different than the operating temperature at which the last mainframe calibration was performed To see how much the operating temperature has changed since the last mainframe calibration and the date of the last mainframe calibration check the Calibration status by pressing the follow
27. at a Glance The HP 83485A B Optical Electrical Plug In Module To use the plug in module the HP 83480A 54750A firmware revision 3 0 or higher is required The plug in module can be installed in slots 1 and 2 or 3 and 4 on the HP 83450A 54750A mainframe The plug in module will not function if it is installed in slots 2 and 3 To make sure the analyzer meets all of the published specifications there must be a good ground connection from the plug in module to the mainframe The RF connectors on the rear of the plug in module are spring loaded so finger tighten the knurled screw on the front panel of the plug in module to make sure the plug in is securely seated in the mainframe Do not use extender cables to operate the plug in module outside of the mainframe The plug in module using extender cables can be damaged by improper grounding when using extender cables Trigger The external trigger level range for this plug in module is 1 V The trigger source selection follows the slots the plug in module is installed in For example if the plug in module is installed in slots 1 and 2 then the trigger source is listed as trigger 2 Ifit is installed in slots 3 and 4 then the trigger source is listed as trigger 4 The maximum safe input voltage is 2 V peak ac 16 dBm The input circuits can be damaged by electrostatic discharge ESD Therefore avoid applying static discharges to the front panel input connectors Before co
28. b 4 9 Characteristics The following characteristics are typical for the HP 83485A B optical electrical plug in module See the HP 54701A Active Probe Service Guide for complete probe characteristics Trigger input characteristics Electrical and Optical Channels Nominal Impedance 50 Q Input Connector 3 5 mm dei Trigger level Range y Vde ac peak 16 dBm lt 0 for 100 ps rise time Maximum Safe input Voltage Percent Reflection Refer to the HP 83480A 54750A User s Guide for trigger specifications 4 10 Declaration of Conformity DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN 45014 Manufacturers Name Hewlett Packard Co Manufacturers Address 1400 Fountaingrove Parkway Santa Rosa California 95403 U S A Declares that the product Product Name Optical Electrical plug in module Model Numbers HP 83485A HP 83485B Product Options This declaration covers all options of the above products Conforms to the following product specifications Safety IEC 1010 1 1990 A1 EN 61010 1 1993 CAN CSA C22 2 No 1010 1 92 EMC CISPR 11 1990 EN 55011 1991 Group 1 Class A IEC 801 2 1991 EN 50082 1 1992 4 kV CD 8 kV AD IEC 801 3 1984 EN 50082 1 1992 3V m 27 500 MHz IEC 801 4 1988 EN 50082 1 1992 500 V signal 1000 V AC Supplementary Information This product was tested in an HP 83480A mainframe This product complies with the requirements of the Low Vo
29. cal plug in module incorporates a 30 GHz optical measurement channel and a 40 GHz electrical channel The electrical channel also has a reduced bandwidth setting of 18 GHz for improved noise performance The integrated optical channel reduces mismatch loss variation by eliminating signal distorting cables and connectors associated with the use of external receivers in order to accurately characterize optical waveforms The optical 1 2 The Instrument at a Glance channel is calibrated at 1310 nm and 1550 nm to provide both accurate display of the received optical waveform in optical power units and measurement of the signal s average power In addition the User Cal feature provides for consistent accuracy at any wavelength between 1200 nm and 1600 nm using a source and power meter The HP 83485A optical electrical plug in module also is a calibrated SONET SDH reference receiver that is measured to comply to ITU TS formerly CCITT G 957 and Bellcore GR 253 CORE frequency response requirements for transmitter compliance testing By either pressing a front panel button or issuing an HP IB command a fourth order Bessel Thomson filter is inserted into or removed from the measurement channel by a very repeatable HP microwave switch The switch removes the potential variability and the time wasted by manually inserting and removing the filter when alternating between high fidelity waveform characterization and SONET SDH compliance testing Th
30. ce the primary source of calibration error on the optical channel is offset drift this function is useful after the plug in module vertical calibration described in Chapter 3 has been performed and if the plug in module has not been removed and reinstalled Performing an Offset Zero calibration is much faster than performing a complete vertical calibration Channel Calibrate Offset zero The plug in module is provided with factory optical calibrations at 1310 nm and 1550 nm The O E Calibration function allows you to calibrate the instrument for use at one additional user defined wavelength between 1200 nm and 1600 nm This calibration does not affect the factory calibrations 2 14 Channel Setup Menu Calibrate probe Connect a voltage probe to the plug in and then press Calibrate probe The analyzer calibrates to the tip of the probe by setting the probe attenuation to the actual attenuation ratio of the probe The analyzer also automatically compensates for any offset the probe may introduce The CAL signal is internally routed to the probe tip for HP probes Key Path Calibrate Calibrate probe 2 15 Channel Setup Menu Calibration Overview Calibration Overview What you ll find in this chapter Factory Calibrations User Calibrations Optical and Electrical Complete Calibration This chapter describes the calibration of the mainframe and the plug in modules It is intended to give you
31. digitizing oscilloscope a firmware upgrade must first be installed Order the HP 83480K communications firmware kit and follow the installation instructions 1 8 The Instrument at a Glance The HP 83485A B Optical Electrical Plug In Module The purpose of the plug in module is to provide measurement channels including sampling for the mainframe The plug in module scales the input signal sets the bandwidth of the system and allows the offset to be adjusted so the signal can be viewed The output of the plug in module is an analog signal that is applied to the ADCs on the acquisition boards inside the mainframe The plug in module also provides a trigger signal input to the time base trigger board inside the mainframe 1 9 The Instrument at a Glance The HP 83485A B Optical Electrical Plug In Module Front panel of the plug in module The plug in module takes up two of the four mainframe slots The optical channel provides calibrated measurement of optical waveforms in power units Bandwidths are selectable on both channels to optimize sensitivity and bandwidth The front panel of the plug in module has two channel inputs and an external trigger input The front panel also has two Probe Power connectors for HP 54700 series probes Aux Power connector for general purpose use and a key for each channel that displays the softkey menu The softkey menu allows you to access the channel setup features of the plug in module
32. e HP 83485B optical electrical plug in module includes a reference receiver path similar to the HP 83485A for 10 Gb s transmitter test Although no industry standards exist for 10 Gb s testing the HP 83485B has been designed to meet anticipated future standards The electrical measurement channel may be used to perform measurements on tributary electrical signals to evaluate receiver performance in transceiver testing for measurements with HP s wide range of external optical receivers or for general purpose measurements The HP 83485A optical electrical plug in module provides 12 4 GHz and 20 GHz optical channel 12 4 GHz and 20 GHz electrical channel Switchable SDH SONET filter for transceiver compliance testing Trigger channel input to the mainframe The HP 83485B optical electrical plug in module provides 30 GHz optical channel 18 GHz and 40 GHz electrical channel Switchable SDH SONET filter for transceiver performance testing Trigger channel input to the mainframe 1 3 Ordering information HP 83485A options Option 030 Built in STM 1 0C 3 155 Mb s SDH SONET reference receiver Option 032 Built in STM 4 0C 12 622 Mb s SDH SONET reference receiver Option 034 Built in STM 16 0C 48 2 488 Gb s SDH SONET reference receiver Option OBW AP 83485A B Service Guide Option 0B1 Additional set of user documentation Option OBO Deletes the user documentation Option UK6 Measured performance data HP 83485B options Option 001 Late
33. emperature has changed by greater than 2 C from the previous vertical calibration This procedure displays the temperature change that the instrument has undergone since the last Plug in Vertical Calibration 1 Press the front panel channel SETUP key 2 Press Calibrate and then Cal status on The current plug in ATemp value is listed for each installed module 3 11 To perform a plug in module vertical calibration Calibration Overview User Calibrations Optical and Electrical 1 Remove any front panel connections from electrical channels 2 Cover the optical inputs for the optical channels 3 Press Utility Calibrate andthen Calibrate plug in 4 Select the plug in module to be calibrated press 1 and 2 or 3 and 4 5 Press Start cal to start the calibration 6 Follow the on screen instructions No additional equipment is required to perform a plug in vertical calibration Reference signals are both generated and routed internally for the optical and electrical channels If you are prompted to connect the calibrator output to the electrical channel during an optical vertical calibration then the factory O E calibration has been lost The module must then be returned to HP for calibration Offset Zero Calibration The offset zero calibration performs a quick offset calibration on the optical channel for optical measurements Since the primary source of calibration error on the optical channel is offs
34. engths It also allows you to place the triggered edge at the center of the display when you are using a power splitter connected between the channel and trigger inputs Another use for skew is when you are comparing two waveforms that have a timing difference between them If you are more interested in comparing the shapes of two waveforms rather than the actual timing difference between them you can use Skew to overlay one waveform on top of the other waveform To skew two channels 1 Turn both channels on and overlay the signals vertically 2 Expand the time base so the rising edges are about a 45 degree angle 3 Adjust the skew on one of channels so that the rising edges overlap at the 50 percent points Channel Calibrate Skew Cal status Key Path Current Date Current Frame ATemp Channel Setup Menu The Cal Status function displays a screen similar to Figure 2 3 Calibrate Cal Status Current Date 28 SEP 94 08 16 Current Frame ATemp 1 2C Channel 1 Vertical Calibration Status Optical Calibration Status Optical Conversion 1 310 pm Channel Channel Channel Channel Optical Conversion 1 550 pm 24 69 UAH Plug in Model number 83485A Serial number sn Last Calibration 16 SEP 94 13 30 Current Plugin ATemp 1 C Figure 2 3 A typical Cal Status display This is the current date and time You can compare this to the last plug in module calibration time That way yo
35. ent for use at one additional user defined wavelength This calibration does not affect the factory calibrations See the following section on User Calibrations for additional information on this procedure 3 6 User Calibrations Optical and Electrical The following calibrations can be performed by the user O E User Wavelength Calibration Plug in Module Vertical Calibration Offset Zero Calibration Dark Calibration Probe Calibration Channel Skew External Scale Electrical channels have calibration procedures for e adjusting timebase skew for matching propagation delay between channels probes cables and so forth e using external probes Optical channels have calibration procedures for e adjusting timebase skew e monitoring and adjusting internal offsets e performing a user defined O E responsivity adjustment The input circuits can be damaged by electrostatic discharge ESD Avoid applying static discharges to the front panel input connectors Before connecting a coaxial cable to the connectors momentarily short the center and outer connectors of the cable together Avoid touching the front panel input connectors without first touching the frame of the instrument Be sure the instrument is properly earth grounded to prevent buildup of static charge An antistatic mat and wristband are strongly recommended particularly when working with TDR modules CAUTION 3 7 Calibration Overview User Cal
36. er Calibrations Optical and Electrical O E User Wavelength Calibration Plug in Module Vertical Calibration Offset Zero Calibration Dark Calibration Channel Skew Calibration m m a a a pa pp 1 1 poa poa 1 poa ew 2 4 2 5 2 6 2 7 2 7 2 9 2 9 2 11 Contents 1 Probe Calibration e 3 16 External Scale 3 18 Complete Calibration Summary 3 20 4 Specifications and Regulatory Information Specifications 4 3 Vertical specifications 4 3 Environmental specifications 4 9 Characteristics 4 10 Trigger input characteristics 410 Declaration of Conformity 2 2 AIl 5 In Case of Difficulty If the mainframe does not operate 2 2 5 3 If the plug in does not operate 1 o 5 4 Error Messages 5 6 Index Contents 2 Figures 1 1 Front panel of the plug in module 1 10 2 1 Optical Channel Setupmenu 2 3 2 2 Electrical Channel Setupmenu 2 4 2 3 A typical Cal Status display 2 18 3 1 Current Frame ATemp condition 3 5 3 2 Plug in calibration menu 2 2 2 3 10 3 3 Offset Zero Calibration 3 13 3 4 Dark calibration menu o LN 3 5 Electrical Channel Calibrate Menu SN 3 6 External Scale Menu 319 Tables 3 1 Factory Calibration Summary o 3 4 3 2
37. eristic of a lightwave connector Typical values are less than 1 dB of loss and sometimes as little as 0 1 dB of loss with high performance connectors Return loss is another important factor It is a measure of reflection the less reflection the better the larger the return loss the smaller the reflection The best physically contacting connectors have return losses better than 50 dB although 30 to 40 dB is more common De You can visually inspect your cables Although it is not necessary visual inspection of fiber ends can be helpful Contamination or imperfections on the cable end face can be detected as well as cracks or chips in the fiber itself Use a microscope 100X to 200X magnification to inspect the entire end face for contamination raised metal or dents in the metal as well as any other imperfections Inspect the fiber for cracks and chips Visible imperfections not touching the fiber core may not affect performance unless the imperfections keep the fibers from contacting 1 14 CAUTION CAUTION The Instrument at a Glance Cleaning Connections for Accurate Measurements To clean a non lensed connector Do not use any type of foam swab to clean optical fiber ends Foam swabs can leave filmy deposits on fiber ends that can degrade performance 1 Apply isopropyl alcohol to a clean lint free cotton swab or lens paper Cotton swabs can be used as long as no cotton fibers remain on the fiber
38. ess Calibrate and then 0 E cal calibration 3 Input the correct wavelength and follow the instructions on the screen Calibrate 3k Figure 3 2 Plug in calibration menu 3 10 To use an OJE user wavelength calibration To view the temperature change Calibration Overview User Calibrations Optical and Electrical 1 Press the plug in module s front panel optical channel SETUP key 2 Press Bandwidth wavelength and then Wavelength 3 Press Usr wavelength and then Enter Plug in Module Vertical Calibration The plug in module vertical calibration is for both optical and electrical measurements It allows the instrument to establish the calibration factors for a specific plug in when the plug in is installed in the mainframe The plug in calibration factors are valid only for the specific mainframe slot in which it was calibrated The plug in vertical calibration establishes vertical accuracy A plug in vertical calibration should be done if The mainframe has cycled power e The plug in has been repaired reprogrammed or removed from the mainframe e The instrument s operating temperature has changed and remains more than 5 C from the temperature at which the Plug in calibration was performed To obtain the best measurement results it is recommended that a user vertical calibration be performed after every 10 hours of continuous use or if the t
39. et drift this function is useful between the plug in module vertical calibrations if the plug in module has not been removed or reinstalled and the operating temperature has not changed more than 5 C In order to ensure that instrument specifications are met perform the plug in vertical calibration Performing an offset zero calibration is much faster than performing a complete vertical calibration For critical measurements where offset measurement uncertainty is important to consider perform an offset zero calibration between module vertical calibrations Perform an offset zero calibration if the vertical scale or offset changes 3 12 Calibration Overview User Calibrations Optical and Electrical To initiate an offset 1 Disconnect all inputs from the module being calibrated calibration 2 Cover all optical inputs 3 Press the plug in module s front panel optical channel SETUP key 4 Press Calibrate and then Offset zero Calibrate Avgs 0 ke Figure 3 3 Offset Zero Calibration 3 13 To initiate a dark calibration Calibration Overview User Calibrations Optical and Electrical Dark Calibration The dark calibration is for optical measurements or electrical measurements if an external O E is being used This calibration measures the optical channel offset signal when there isn t any light present and then uses this information in performing
40. extinction ratio measurements Dark calibrations should be done for the following conditions e Before any critical extinction ratio measurements are made e After a plug in vertical calibration e If a module has been removed e If the mainframe power has been cycled e f extinction ratio measurements are being made after the vertical scale or the offset has changed If the line power has been cycled the dark calibration invokes either the offset zero calibration or plug in vertical calibration as needed This increases the time required for the dark calibration to complete The Dark cal softkey is located within the Extinction ratio menu 1 Press the Display key Press the Color grade softkey and set its setting to on Color grade must be enabled to perform an extinction ratio measurement and a Dark calibration In addition the dark level amplitude when there is no signal present must be on the screen to perform a Dark calibration 2 Press the blue shift key and then the Meas eye softkey which is located beneath the display 3 Press Extinetion ratio andthen Dark cal Disconnect all inputs from the module including the trigger signal and block any ambient light to the photodetector with a connector plug Follow the instructions on the screen 3 14 Calibration Overview User Calibrations Optical and Electrical Color grade is enabled Ext ratio Avgs 0 ke 1 Format
41. f not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met The warning sign denotes a life threatening hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until the indicated conditions are fully understood and met Instruction The instruction manual symbol The product is marked with this symbol when it is necessary Manual for the user to refer to the instructions in the manual 111 WARNING WARNING WARNING CAUTION CAUTION General Safety Considerations Before this instrument ts switched on make sure it has been properly grounded through the protective conductor of the ac power cable to a socket outlet provided with protective earth contact Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal can result in personal injury There are many points in the instrument which can if contacted cause personal injury Be extremely careful Any adjustments or service procedures that require operation of the instrument with protective covers removed should be performed only by trained service personnel If this instrument is not used as specified the
42. ge the offset setting The fine mode also works with offset When an HP 54700 series active probe is used with the plug in module and is connected to the probe power connector adjacent to the channel input the offset control adjusts the external scale factor and offset of the hybrid inside the active probe A probe connected to the auxiliary power connector adjacent to the trigger input will function but the channel scale factor will not be adjusted automatically The optical channel displays the value in watts and the electrical channel displays the value in volts Offset Bandwidth Wavelength You can use the Bandwidth Wavelength softkey to change the bandwidth and wavelength settings and turn the filter on and off on the optical channel 2 7 Bandwidth Key Path Filter On Off Key Path Wavelength Key Path Channel Setup Menu HP 83485A This function is available on the electrical channel and on the optical channel only when the filter is switched off You can use the Bandwidth function to select either the 12 4 GHz or the 20 GHz bandwidth HP 83485B This function is available on the electrical channel only You can use the Bandwidth function to select either the 18 GHz or 40 GHz bandwidth Channel Bandwidth Wavelength Bandwidth The Filter function allows a SONET SDH Bessel Thomson filter to be switched into the channel to create a SONET SDH reference receiver HP 83485A Option
43. hoices softkey will be indicated throughout this manual as Sweep Triggered Freerun Triggered When some softkeys such as Calibrate probe are pressed the first time a measurement will be made and the result will be provided Some softkeys such as Offset require the entry of a numeric value To enter or change the 1 6 The Instrument at a Glance Menu and Key Conventions value use the general purpose knob located below the front panel Measure section 1 7 The HP 83485A B Optical Electrical Plug In Mod ule The HP 83485A B optical electrical plug in modules are two of several plug in modules available for the HP 83480A 54750A mainframes Their main features are e Integrated calibrated optical channel e Optical channel includes switchable SONET SDH filter e Electrical measurement channel e 2 5 GHz trigger channel Both optical and electrical measurement channels have user selectable bandwidths of 12 4 or 20 GHz HP 83485A only 30 GHz optical channel bandwidth and user selectable 18 or 40 GHz electrical channel bandwidth HP 83485B only e 3 5 mm m connectors on electrical measurement channel and trigger channel 2 4 mm m connector on electrical channel of HP 83485B e One probe power connector e One auxiliary power connector Optical channel has an HP universal adapter for 9 125 um single mode fiber input NOTE If you wish to use the HP 83485A B optical plug in module in an HP 547504
44. ibrations Optical and Electrical Table 3 2 Optical and Electrical Channel User Calibration Summary Calibration What is calibrated Measurements Affected Recommended Interval Key Path O E User The photodetector Channels affected optical All Annual re calibration of user Optical Channel Setup Wavelength responsivity optical channel measurements defined non factory wavelengths Calibrate Calibration at user wavelengths O E Cal Plug in Vertical offset and vertical Channels affected optical amp Perform after any power cycle or Utility Vertical scale accuracy for both electrical Any optical or once every 10 hours during Calibrate Calibration electrical and optical electrical vertical continuous use or if operatin P poraung Calibrate Plug in channels measurements such as emperature changes by more Vo to p eye height han 2 C extinction ratio and the optical power meter Offset Zero Vertical offset is calibrated Channels affected optical Perform a plug in vertical Optical Channel Setup Calibration for the optical channel Any optical vertica calibration in order to meet Calibrate only This calibration measurements cluding published specifications Because Offset 0 doesn t include vertical Vo to p eye height and he offset zero calibration scale accuracy extinction ratio performs only the offset portion of the plug in vertical calibration it should only
45. ing key sequence Utility Calibrate and then Cal status on The temperature change is displayed at the top of the display as shown in the following figure Calibrate Current Frame ATemp 12 C Frame C Calibration Status Calibrated Last Calibration 3 NOU 97 07 42 Calibration Memory Protected Other Calibration Status H Passed Comments Plug ins Last Calibration Slot Model Memory Date Time Accuracy Temp 1 83486A Unprotected 2 3 empty 4 empty Figure 3 1 Current Frame ATemp condition 3 5 Calibration Overview Factory Calibrations If the Current Frame ATemp listing is greater than 5 C then the mainframe should either be calibrated at the current operating temperature or be placed in an ambient air temperature that is within 5 C of the temperature of the current calibration O E Factory Wavelength Calibration Optical electrical O E factory wavelength calibration compensates for the photodetector responsivity The accuracy of all optical channel measurements is dependent on proper O calibration O E calibrations should be performed annually Most customers return their optical plug ins to an authorized HP service center for this calibration at the same time they are having their mainframes re calibrated The HP 83480 series optical modules have one or two standard wavelengths 850 nm or 1310 1550 nm The O E Calibration function allows you to calibrate the instrum
46. key menu press the unlabeled key immediately next to the annotation on the screen The unlabeled keys next to the annotation on the display are called softkeys Additional functions are listed in blue type above and below some of the front panel keys These functions are called shifted functions To activate a shifted function press the blue front panel Shift key and the front panel key next to the desired function Throughout this manual front panel keys are indicated by a box around the key label for example Timebase Softkeys are indicated by shading on the key label for example Mask Align The softkeys displayed depend on the front panel key pressed and which menu is selected Shifted functions are indicated by the front panel Shift key followed by the shaded shifted function for example the Local function above the Stop Single front panel key will be shown as Shift Local A softkey with On and Off in its label can be used to turn the softkey s function on or off To turn the function on press the softkey so On is highlighted To turn the function off press the softkey so Off is highlighted An On or Off softkey function will be indicated throughout this manual as Test On A softkey such as Sweep Triggered Freerun offers you a choice of functions In this case you could choose Triggered by pressing the softkey until Triggered is highlighted or choose Freerun by pressing the softkey until Freerun is highlighted A c
47. l 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 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 vii Contents 1 The Instrument at a Glance Ordering information Menu and Key Conventions The HP 83485A B Optical Electrical Plug In Module Front panel of the plug in module Getting the best performance Installing the plug in module Trigger Cleaning Connections for Accurate Measurements To clean a non lensed connector To clean an adapter To test insertion loss To test return loss 2 Channel Setup Menu Displaying the Channel Setup menus Display Scale Offset Se Channel autoscale External scale Calibrate 3 Calibration Overview Factory Calibrations Mainframe Calibration O E Factory Wavelength Calibration Us
48. l scale The Atten Units function lets you select how you want the probe attenuation factor represented The choices are either decibel or ratio The formula for calculating decibels is 20 log JI or 10 log G 2 9 Attenuation Key Path Units Key Path Channel Setup Menu The Attenuation function lets you select an attenuation that matches the device connected to the analyzer When the attenuation is set correctly the analyzer maintains the current scale factors 1f possible All marker values and voltage or wattage measurements will reflect the actual signal at the input to the external device The attenuation range is from 0 0001 1 to 1 000 000 1 When you connect a compatible active probe to the probe power connector adjacent to the channel input the instrument automatically sets the attenuation For all other devices set the probe attenuation with the knob arrow keys or keypad NOTE Refer to Chapter 3 for information on calibrating to the tip of the probe Channel External scale Attenuation The Units function lets you select the unit of measure appended to the channel scale offset trigger level and vertical measurement values For the optical channel these units are Volts or Watts For the electrical channel the units are Volts Amperes Watts or unknown Use Volt for voltage probes Ampere for current probes Watt for optical to electrical O E converters and unknown when there is no u
49. lays are turned on or unless a math function is using one of the channels Channel Display 2 5 Key Path Channel Setup Menu Scale The Scale softkey controls the vertical scaling of the waveform If the fine mode is off then the knob and arrow keys change the vertical scaling in a 1 2 5 sequence When fine mode is on the knob and arrow keys change the vertical scaling in 1 mV increments You can also use the keypad to enter values in 1 mV increments independent of the fine mode selection The units the scale is displayed in depend on the unit of measure selected with the Units softkey The choices for units are volts or watts Amperes or unknown are available on electrical channels only Channel Scale 2 6 Key Path Channel Setup Menu Offset The Offset softkey moves the waveform vertically It is similar to the position control on analog oscilloscopes The advantage of digital offset is that it is calibrated The offset voltage for electrical channels is the voltage at the center of the graticule area and the range of offset is 12 times the full resolution channel scale For optical channels the offset wattage is the wattage two graticule divisions above the bottom of the screen This is set because unlike voltage displays negative power levels do not exist but the zero power level can be viewed clearly when the offset is set to zero watts You can use the knob arrow keys or keypad to chan
50. le de Accuracy single marker 12 4 GHz bandwidth 0 4 of full scale 2 mV 1 5 reading channel offset 2 C LAT 2 reading 0 4 hr ATime reading 0 4 of full scale 2 mV 3 reading channel offset 2 C LAT 2 reading 0 4 hr ATime reading 20 GHz de Difference two marker accuracy on same channel 12 4 GHz 0 8 of full scale 1 5 of delta marker reading 2 C LAT 2 reading 0 4 hr ATime reading 20 GHz 0 8 of full scale 3 of delta marker reading 2 C LAT 2 reading 0 4 hr ATime reading 1 It is recommended that a user vertical calibration be performed after every 10 hours of continuous use or if the temperature has changed by greater than 2 C from the previous vertical calibration 2 Where AT represents the temperature change in Celsius from the last user vertical calibration Note that the temperature term goes to zero upon execution of a vertical calibration 3 Where ATime represents the time since the last user vertical calibration The uncertainty due to time typically stabilizes after 24 hours This term goes to zero upon execution of a vertical calibration 4 3 Specifications and Regulatory Information Specifications HP 83485A Electrical Channel Vertical Specifications continued Transition Time 10 90 characteristic calculated from T 0 30 8W elect
51. ltage Directive 73 23 EEC and the EMC Directive 89 336 EEC Santa Rosa California Zz F a Location Date Dixon Browder Quality Manager European Contact Your local Hewlett Packard Sales and Service Office or Hewlett Packard GmbH Department ZQ Standards Europe Herrenberger Stra e 130 D 71034 Boblingen FAX 49 7031 14 3143 Specifications and Regulatory Information In Case of Difficulty In Case of Difficulty What you ll find in this chapter This chapter provides a list of suggestions for you to follow if the plug in module fails to operate A list of messages that may be display is also included For complete service information refer to the optional AP 934854 B Service Guide Review the procedure being performed when the problem occurred Before calling Hewlett Packard or returning the unit for service a few minutes spent performing some simple checks may save waiting for your instrument to be repaired 5 2 If the mainframe does not operate In Case of Difficulty If the mainframe does not operate Please make the following checks a Is the line fuse good c Does the line socket have power c Is the unit plugged in to the proper ac power source o Is the mainframe turned on c Is the rear panel line switch set to on c Will the mainframe power up without the plug in module installed If the mainframe still does not power up refer to the optional HP 83480
52. m Sate Input Wavelength Range Measured response conforms to ITU TS G 957 and GR 253 CORE for STM 16 OC 48 Option 034 or STM 4 0C 12 Option 032 or STM 1 OC 3 Option 030 1310 nm and 1550 nm 30 dBm to 3 dBm 1 uW to 2 mW 5 of reading 100 nW connector uncertainty 2 of reading 100 nW power meter accuracy 2 mW 0 mW peak 200 1600 nm 1 A user calibration can be performed with average optical power levels from 100 to 2000 uW however the instrument optical accuracy specification is only vaild for average optical calibration powers form 500 to 20 00 pW 4 6 Specifications and Regulatory Information Specifications HP 83485B Electrical Channel Vertical Specifications Bandwidth 3 dB de Accuracy single voltage marker 18 GHz 40 GHz Transition Time 10 to 90 calculated from T 0 35 bandwidth Maximum RMS Noise 18 GHz 40 GHz Scale Factor full scale is eight divisions inimum laximum de Offset Range Inputs Dynamic Range Maximum Safe Input Voltage minal Impedance Reflections D Connector de to 40 GHz or de to 18 GHz luser selectable 20 4 of full scale 2 mV 1 5 reading channel offset E 2 C AT 2 reading 0 4 of full scale 2 mV 3 reading channel offset DS Tea reading lt 9 ps 40 GHz BW lt 19 5 ps 18 GHz BW lt 0 5 mV 10 25 mV typical 1 0 mV 10 5 mV
53. nframe to plug in module interface of the specified slot If the slot is empty there is a mainframe hardware problem Refer to the HP 83480A 54750A Service Guide If a plug in is installed in the slot there is a plug in module hardware problem Refer to the optional HP 83485A B Service Guide The information read from the plug in module s memory does not match the hardware in the plug in module This can be caused by a communication problem between the mainframe and the plug in module Make sure there is a good connection between the mainframe and the plug in 1 Remove and reinstall the plug in module 2 Verify the plug in module is firmly seated in the mainframe slot 3 Verify the knurled screws at the bottom of the plug in module are finger tight 4 The HP 54750A mainframe does not accept the HP 83485A B optical electrical plug in module To use the optical plug in modules a firmware upgrade must first be installed Order the HP 83480K communications firmware kit and follow the installation instructions 5 The HP 83480A 54750A mainframes do not accept plug in modules designed for use with the HP 54710A 54720A The power is too low to perform a user O E calibration 5 7 In Case of Difficulty Index Index accessories connection devices 1 5 optional 1 5 accuracy performance 1 11 active probe 2 7 attenuation range 2 10 Attenuation softkey 2 10 attenuator scaling 2 9 Atten units softkey
54. nit of measure or when the unit of measure is not one of the available choices Channel External scale Units Ext gain and Ext offset Key Path Key Path Channel Setup Menu When you select Ampere Watt or unknown on an electrical channel or Voltage on an optical channel two additional functions become available External Gain and External Offset These two additional functions allow you to compensate for the actual characteristics of the probe rather than its ideal characteristics For example you might have an amplified lightwave converter with ideal characteristics of 300 V W with 0 V offset But its actual characteristics are 324 V W with 1 mV of output offset Therefore set the External Gain to 324 V W and the External Offset to 1 mV External scale Units Volt Ext gain or Ext Offset External scale Units Watt Ext gain or Ext Dffset External scale Units Unknown Ext gain or Ext Dffset Calibrate The calibrate menu allows you to null out any skew between probes or cables remove the effects of offsets in the internal O E converter recalibrate the responsivity of the O E converter and check the present calibration status of the analyzer Calibrate 2 11 Skew Key Path Channel Setup Menu The Skew function changes the horizontal position of a waveform on the display The Skew function has a range of 100 us You can use skew to compensate for differences in cable or probe l
55. nnecting any coaxial cable to the connectors momentarily short the center and outer conductors of the cable together Avoid touching the front panel input connectors without first touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge CAUTION Cleaning Connections for Accurate Measure ments Accurate and repeatable measurements require clean connections Use the following guidelines to achieve the best possible performance when making measurements on a fiber optic system e Keep connectors covered when not in use e Use dry connections whenever possible e Use the cleaning methods described in this section e Use care in handling all fiber optic connectors e When inserting a fiber optic connector into a front panel adapter make sure that the fiber end does not touch the outside of the mating connector or adapter Because of the small size of cores used in optical fibers care must be used to ensure good connections Poor connections result from core misalignment air gaps damaged fiber ends contamination and improper use and removal of index matching compounds Use dry connections Dry connectors are easier to clean and to keep clean Dry connections can be used with physically contacting connectors for example Diamond HMS 10 HP FC PC DIN and ST If a dry connection has 40 dB return loss or better making a wet connection will probably not
56. ometer HP 8153 lightwave multimeter with a source and power sensor module in conjunction with a lightwave coupler HP 81554SM dual source and HP 81534A return loss module The Instrument at a Glance Channel Setup Menu CAUTION Channel Setup Menu What you ll find in this chapter This chapter describes the Channel Setup menu A key tree and description of the available functions is included The input circuits can be damaged by electrostatic discharge ESD Therefore avoid applying static discharges to the front panel input connectors Before connecting any coaxial cable to the connectors momentarily short the center and outer conductors of the cable together Avoid touching the front panel input connectors without first touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge At the top of the plug in module are the Channel keys These keys give you access to the Channel Setup menu for each input The Channel Setup menu is displayed on the right side of the screen when the Channel key is pressed There are several types of softkeys available A description of the different softkeys and their functions is provided in the HP 83480A 54750A User s Quick Start Guide supplied with the mainframe NOTE The plug in module has both an electrical channel and an optical channel Although many of the softkeys are similar some difference
57. pply over the temperature range 15 C to 35 C unless otherwise noted after the instrument s temperature has been stabilized after 60 minutes of continuous operation In addition you ll find a declaration relating to regulatory information Specifications described warranted performance Unless otherwise noted corrected limits are given when specifications are subject to minimization with error correction routines Characteristics provide useful nonwarranted information about the functions and performance of the instrument Characteristics are printed in italics HP designs instruments to meet specifications over the recommended calibration interval provided that the instrument is operated within the specified operating environment To maintain specifications periodic recalibrations are necessary We recommend that the plug in module be calibrated at an HP service facility every 12 months Users are encouraged to adjust the calibration cycle based on their particular operating environment or measurement accuracy needs 4 2 Specifications The following are specifications used to test the HP 83485A B plug in module Specifications are valid after a 1 hour warm up period See the AP 54701A Active Probe Service Guide for complete probe specifications Vertical specifications HP 83485A Electrical Channel Vertical Specifications Bandwidth 3 dB on electrical or optical channel de to 12 4 or 20 GHz user selectab
58. protection provided by the equipment could be impaired This instrument must be used in a normal condition in which all means for protection are intact only Before this instrument is switched on make sure its primary power circuitry has been adapted to the voltage of the ac power source Failure to set the ac power input to the correct voltage could cause damage to the instrument when the ac power cable is plugged in Electrostatic discharge ESD on or near input connectors can damage circuits inside the instrument Repair of damage due to misuse is not covered under warranty Before connecting any cable to the electrical input momentarily short the center and outer conductors of the cable together Personnel should be properly grounded and should touch the frame of the instrument before touching any connector Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For assistance contact your nearest Hewlett Packard Sales and Service Office Hewlett Packard Sales and Service Offices U S FIELD OPERATIONS Headquarters Hewlett Packard Company 19320 Pruneridge Avenue Cupertino CA 95014 U S A 800 752 0900 Colorado Hewlett Packard Company 24 Inverness Place East Englewood CO 80112 303 649 5000 New Jersey Hewlett Packard Company 150 Green Pond Road Rockaway NJ 07866 California Northern Hewlett Packa
59. rd Company 301 East Evelyn ountain View CA 94041 415 694 2000 eorgia ewlett Packard Company 000 South Park Place tlanta GA 30339 04 955 1500 Texas Hewlett Packard Company 930 East Campbell Road Richardson TX 75081 NT E e gt California Southern Hewlett Packard Company 1421 South Manhatten Ave Fullerton CA 92631 714 999 6700 Illinois Hewlett Packard Company 5201 Tollview Drive Rolling Meadows IL 60008 708 342 2000 Hewlett Packard S A 150 Route du Nant d Avril 1217 Meyrin 2 Geneva Switzerland 141 22 780 8111 Great Britain Hewlett Packard Ltd Eskdale Road Winnersh Triangle Wokingham Berkshire RG11 5DZ Hewlett Packard France 1 Avenue Du Canada Zone D Activite De Courtaboeut F 91947 Les Ulis Cedex France 133 1 69 82 60 60 201 586 5400 214 231 6101 EUROPEAN FIELD OPERATIONS Headquarters France Germany Hewlett Packard GmbH Hewlett Packard Strasse 61352 Bad Homburg Germany 49 6172 16 0 Hewlett Packard Sales and Service Offices continued INTERCON FIELD OPERATIONS Headquarters Hewlett Packard Company 3495 Deer Creek Rd Palo Alto California 94304 1316 415 857 5027 China China Hewlett Packard Company 38 Bei San Huan X1 Road Shuang Yu Shu Hai Dian District Beijing China 86 1 256 6888 Taiwan Hewlett Packard Taiwan 8th Foor H P Building 337 Fu Hsing North Road Taipei Taiwan
60. rical 124 GHz 28 2 ps 20 GHz 17 5 ps Maximum RMS Noise 12 4 GHz 0 5 mV 0 25 mV typical 20 GHz 1 0 mV 10 5 mV typical Scale Factor full scale is eight divisions inimum 1 mV div aximum 100 mV div de Offset Range 500 mV Nominal Input Impedance 50 Q Connectors 3 5mm m channel and trigger Input Reflection Return Loss lt 5 for 30 ps rise time Number of Channels 1 Dynamic Range Maximum Specified Input Power 400 mV relative to channel offset Maximum Sate Input 2 peak ac 16 dBm 4 4 Specifications and Regulatory Information Specifications HP 83485A Optical Channel Vertical Specifications Bandwidth 3 dB on electrical or optical channel de to 12 4 or 20 GHz luser selectable de Accuracy single marker 12 4 GHz filtered 25 pW 2 reading channel offset 129 20 ATea treading 0 4 hr ATime reading 20 GHz 2 pW 4 reading channel offset 129 20 LAT 9 treading 0 4 hr ATime reading de Difference two marker accuracy on same channel 12 4 GHz filtered 2 of delta reading 12 C LAT 9 treading 0 4 hr ATime reading 20 GHz 4 of delta reading 12 C LAT 9 treading 0 4 hr ATime reading Transition Time 10 90 characteristic calculated trom T 0 48 8W optical 124 GHz 40 ps 20 GHz 20 ps STM 16 00 48 filter 190 p
61. s STMAJOC 12 filter 750 ps STM I OC 3 filter Zo Maximum RMS Noise 12 4 GHz filtered 12 pW 8 pW typical 20 GHz 25 uW 115 o typical Scale Factor full scale is eight divisions Minimum 20 pWidiv Maximum 500 pWidiv de Offset Range 1 to 3 mW referenced two divisions below center screen Connectors User selected option 9 125 em single mode fiber Input Reflection Return Loss gt 33 dB for HMS 10 HP interface connector 1 It is recommended that a user vertical calibration be performed after every 10 hours of continuous use or if the temperature has changed by greater than 2 C from the previous vertical calibration 2 Referenced to average power meter 3 Where AT represents the temperature change in Celsius from the last user vertical calibration Note that the temperature term goes to zero upon execution of a vertical calibration 4 Where ATime represents the time since the last user vertical calibration The uncertainty due to time typically stabilizes after 24 hours This term goes to zero upon execution of a vertical calibration 4 5 Specifications and Regulato Specifications HP 83485A Optica ry Information Channel Vertical Specifications continued Filtered Response Calibrated Wavelengths Average power Monitor Specified Operating Range Factory Calibrated Accuracy 20 C 30 C User Calibrated Accuracy lt 5 C temp change Number of Channels Dynamic Range Maximum Specified Input Power Maximu
62. s exist The examples in this book use the optical channel and note when the user would see differences if using the electrical channel 2 2 Channel Setup Menu Channel Display off Scale on Offset Bandwidth Wavelength HP 834B5A HP 834858 Bandwidth tr 20 GHz 30 GHz 12 4 GHz Filter off on Wavelengt 1 310um 1 550um User Channel autoscale External scale Wavelengt 1 310um 1 550um User Atten units decibe ratio Attenuation Units Volt Ext gain Watt Ext offset Calibrate Skew Cal Status off on Offset zero LO E Cal 54750b02 Figure 2 1 Optical Channel Setup menu 2 3 Channel Setup Menu Channel Display off Scale on Offset HP 83435A HP 834856 Bandwidth Lk 20 GHz 40 GHz 12 4 GHz 18 GHz Channel autoscale External scale
63. st operating system firmware for the HP 83480A mainframe Option 002 Latest operating system firmware for the HP 54750A mainframe Option 040 Fourth order filter 10 Gb s reference receiver Option 050 Fifth order filter 10 Gb s reference receiver Optical connector Option 011 Diamond HMS 10 HP interface options Option 012 FC PC Option 013 DIN 47256 Option 014 ST Option 015 Biconic Option 017 SC 1 4 Optional accessories The Instrument at a Glance Ordering information HP 54006A 6 GHz divider probe HP 54008A 22 ns delay line HP 54118A 500 MHz to 18 GHz trigger HP 10086A ECL terminator SMA f f adapter HP part number 1250 1158 SMA 500 termination HP part number 1810 0118 1 each APC 3 5 f f adapter HP part number 1250 1749 APC 2 4 f f adapter HP 11900B APC 2 4 to 3 5 f f adapter HP 11901B HP 81000AI Diamond HMS 10 HP connector interface HP 81000FI FC PC SPC APC connector interface HP 81000KI SC connector interface HP 8100051 DIN 47256 4108 6 connector interface HP 81000VI ST connector interface HP 81000WI Biconic 1 5 Menu and Key Conventions The keys labeled Trigger Disk and Run are all examples of front panel keys Pressing some front panel keys accesses menus of functions that are displayed along the right side of the display screen These menus are called softkey menus Softkey menus list functions other than those accessed directly by the front panel keys To activate a function on the soft
64. sts the channel vertical scale factors to the probe s nominal attenuation even if a probe calibration is not performed For passive probes or non identified probes the instrument adjusts the vertical scale factors only if a probe calibration is performed Probe calibration allows the instrument to establish the gain and offset of specific probes that are connected to a channel of the instrument and then apply those factors to the calibration of that channel The analyzer calibrates to the tip of the probe by setting the probe attenuation to the actual attenuation ratio of the probe The CAL signal is internally routed to the probe tip for HP active probes The mainframe s CAL signal is a voltage source therefore you can let the instrument compensate for the actual characteristics of your probe by letting the instrument calibrate to the tip of the probe The instrument automatically calibrates to the tip of the probe sets the probe attenuation and compensates for any probe offset If you do not perform a probe calibration but want to use a passive probe enter the attenuation factor using the following steps 1 Press the plug in module s front panel channel SETUP key 3 16 To calibrate an HP identifiable probe To calibrate a non identifiable probe Calibration Overview User Calibrations Optical and Electrical 2 Press External scale and then Attenuation You can use the probe calibration to calibrate any network
65. the end of the chapter Both factory and user calibrations must be 3 2 CAUTION Calibration interval Required warm up time Remote operation Calibration Overview performed regularly in order to ensure proper measurement accuracy and repeatability The input circuits can be damaged by electrostatic discharge ESD Avoid applying static discharges to the front panel input connectors Before connecting a coaxial cable to the connectors momentarily short the center and outer connectors of the cable together Avoid touching the front panel input connectors without first touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge It is strongly recommended that an antistatic mat and wristband be used when connecting to electrical channel inputs particularly TDR inputs HP recommends that the factory calibration be performed on a periodic basis HP designs instruments to meet specifications over the recommended calibration interval provided that the instrument is operated within the specified operating environment To maintain specifications periodic recalibrations are necessary We recommend that the plug in module be calibrated at an HP service facility every 12 months Users are encouraged to adjust the calibration cycle based on their particular operating environment or measurement accuracy needs The instrument requires a 1 hour warm up period before any
66. the mainframe will not trigger 5 4 In Case of Difficulty If the plug in does not operate o Make sure the mainframe identifies the plug in module by pressing System contig The calibration status of the plug in modules is listed near the bottom of the display in the box labeled Plug ins If the model number of the plug in module is listed next to the appropriate slot number then the mainframe has identified the plug in If known is displayed instead of the model number of the plug in module remove and reinsert the plug in module in the same slot If known is still displayed then the memory contents of the plug in module are corrupt Refer to the optional HP 83485A B Service Guide or contact a qualified service department If all of the above steps check out okay and the plug in module still does not operate properly then the problem is beyond the scope of this book Refer to the optional HP 83485A B Service Guide or return the plug in module to a qualified service department 5 5 Error Messages Memory error occurred in plug in Try reinstalling plug in Busy timeout occurred with plug in Try reinstalling plug in In Case of Difficulty The following error messages are for the plug in module Typically the error messages indicate there is a problem with either the plug in or the mainframe This section explains what the messages mean and offers a few suggestions that might
67. typical 1 mVidiv 100 mV div 500 mV 400 mV relative to channel offset 16 dBm peak ac 2V de 50 Q lt 5 for 20 ps rise time 2 4mm ml m rom the previous vertical calibration t is recommended that a user vertical calibration be performed after every 10 hours of continuous use or if the temperature has changed by greater than 2 C 2 Where AT represents the temperature change in Celsius from the last user vertical calibration Note that the temperature term goes to zero upon execution of a vertical calibration 4 7 Specifications and Regulatory Information Specifications HP 83485B Optical Channel Vertical Specifications Bandwidth 3 dB de Accuracy Optical channel referenced to average power meter de Difference two marker accuracy same channel referenced to average power monitor Transition Time 10 to 90 characteristic calculated from T1 0 48 bandwidth optical Maximum RMS Noise Scale Factor full scale is eight divisions inimum aximum de Offset Range Co Input Return Loss Filtered Bandwidth s ector Type Calibrated Wavelengths Average Power Monitor Specified Operating Range Factory Calibrated Accuracy 20 C to 30 C User Calibrated Accuracy 1 lt 5 C temp changel Maximum Specified Input Power Maximum Sate input Wavelength Range de to 30 GHz 50 AN 4 of reading channel offset 129 20 LAT 2 reading 4 of delta re
68. u will know how long it has been since the last plug in module calibration was performed This is the temperature change on the inside of the instrument since the last mainframe calibration was performed A positive number indicates how many degrees warmer the mainframe is currently as compared to the temperature of the mainframe at the last mainframe calibration 2 18 Channel 1 Calibration Status Plug in Offset zero Key Path O E cal Channel Setup Menu The instrument displays Calibrated or Uncalibrated depending on whether the last plug in module calibration is still valid A calibration can be invalidated if e The mainframe has cycled power e The plug in has been repaired reprogrammed or removed from the mainframe e The instrument s operating temperature has changed and remains more than 5 C from the temperature at which the Plug in calibration was performed Uncalibrated indicates the plug in module vertical calibration is invalid The Plug in function lists the model number serial number date time and temperature delta The temperature A is the temperature change from the temperature of the mainframe when the last calibration was performed If this temperature A is greater than 5 C since the last mainframe calibration then you must perform a plug in module calibration to achieve the specified de accuracy The Offset Zero function performs a quick offset calibration on the optical channel Sin

Keysight Agilent HP 83485A Datasheet

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