Tektronix BERTScope DPP125 Quick Start User Manual
Contents
1. 10 A ASEE EE Venen R een eher 10 Connector Replacement oaeeo a aaa iaa 10 Fuse Replacement u een E E 10 CAMA ta 10 A AN 11 A o non 12 DPP125 Digital Pre Emphasis Processor Quick Start User Manual vil Introduction Tg Introduction This Quick Start User Manual supports the Tektronix BERTScope DPP125 Digital Pre Emphasis Processor The DPP125 is a non linear signal conditioning processor intended to add precision calibrated pre emphasis to a serial data waveform generally supplied by the Pattern Generator of the Tektronix BERTScope Bit Error Ratio Analyzer The Pre Emphasis Processor reclocks the data and passes through any calibrated stress jitter which appears on the clock input signal The output signal is buffered through a calibrated output stage providing user control of the amplitude and offset With the exception of the instrument s power switch all control is through the software based graphical user interface When used with a BERTScope Analyzer the interface is found in DPP Control listed in the top level Views menu The DPP125 can also be operated standalone using the BERTScopePC Standalone software supplied with the product and available at www bertscope com BERTScopePC software must be installed to support stand alo2. lt 40 ps typical Intrinsic JM iia ai lt 350 fs rms Physical avia A Dimensions 39 4 x 9 5 x 33 6 cm ria 15 5 x 3 75 x 13 25 in 5 4 12 165 Power Consumption 150 W Max Power 100 240 50 60 2 Power 3 15 A 250 V 5 mm x 20 mm fast blow Environmental Temperature 10 to 40 C Temperature 22 to 60 20 80 non condensing DPP125 Digital Pre Emphasis Processor Quick Start User Manual Notes Optional 4 tap configuration When clocked at data rate Clock Input to Data Output PN31 pattern Independent amplitude control Limited to 1 8 V with offset Additive 1010 pattern Tested per MIL PRF 28800F Tested per MIL PRF 28800F Index Index A Accessories Standards ida 3 C Calibration ici tcs 10 Compliance iaa iv iv Environmental Conf UA ii E 4 Optional A Pi 2 Use with Other Instruments 222222 9 Connector Descriptions aid 4 Replacement
3. Kingdom Australia New Zealand Declaration of Conformity EMC Complies with the EMC provision of the Radiocommunications Act per the following standard in accordance with ACMA CISPR 11 2003 Radiated and Conducted Emissions Group 1 Class A in accordance with EN61326 1 2006 This product is intended for use in nonresidential areas only Use in residential areas may cause electromagnetic interference 2 Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object 3 To ensure compliance with the EMC standards listed here high quality shielded interface cables should be used iv DPP125 Digital Pre Emphasis Processor Quick Start User Manual Compliance Information er as Safety Compliance EC Declaration of Conformity Low Voltage Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities Low Voltage Directive 2006 95 EC EN61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use U S Nationally Recognized Testing Laboratory Listing UL 61010 1 2004 2nd Edition Standard for electrical measuring and test equipment Canadian Certification CAN CSA C22 2 No 61010 1 2004 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 Additional Compliances JEC 61010 1 2001 Safety requirements for electric
4. Quick Start User Manual Compliance Information EER Installation Overvoltage Category Descriptions Terminals on this product may have different installation overvoltage category designations The installation categories are Measurement Category IV For measurements performed at the source of low voltage installation Measurement Category For measurements performed in the building installation Measurement Category II For measurements performed circuits directly connected to the low voltage installation Measurement Category I For measurements performed on circuits not directly connected to MAINS Overvoltage Category Overvoltage Category II as defined in IEC61010 1 Environmental Considerations vi Product End of Life Handling Observe the following guidelines when recycling an instrument or component Equipment Recycling Production of this equipment required the extraction and use of natural resources The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product s end of life In order to avoid release of such substances into the environment and to reduce the use of natural resources we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately This symbol indicates that this product complies with the applicable European Union requirements acc
5. iaa 10 Species ida 11 Contact Tektronix European 2 iv USA Contacta ar 1 Control View 8 E Environmental 0 2 2 22 vi End of Life Handling nenne vi Restriction of Hazardous Substances vi WEEE Recycling vi ESD Preventa aa 3 F Fuse Replacement iia 10 idad 11 I Installation ica ia 3 Operating Requirements 3 Preventing nicas 3 M Maintenance 10 Calibration acer an 10 Connector 10 Fuse 10 O A igen eases 7 Control cena Bein 8 Setting ds 9 P Power Power On iia 7 R Remote Control PDF 2 5 Selina adi iia 1 General Safety 11 Preventing 3 Safety Symbols and seen en 111 Skew ClockVData e 5 11 Setting ii 9 Technical Specifications 2 Technical 1 W Waay eee a i WEBER we 12 DPP125 Digital Pre Emphasis Processor Quick Start User Manual
6. other component manuals for warnings and cautions related to operating the system Maintain Proper Grounding to avoid electrical shock No operator serviceable parts inside Do not remove cover Refer to qualified service personnel Use Proper Power Cord Use only the power cord specified for this product and certified for the country of use WARNING Connect and Disconnect Properly Do not connect or disconnect probes or test leads while they are connected to a voltage source Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Power Disconnect The power cord disconnects the product from the power source Do not block the power cord it must remain accessible to the user at all times Do Not Operate Without Covers Do not operate this product with covers or panels removed Do Not Operate With Suspected Failures If you suspect that there is damage to this product have it inspected by qualified service personnel Avoid Exposed Circuitry Do not touch exposed connections and compon
7. the risk of fire in the event of a power supply failure Access t the power cable for disconnection from mains an emergency may be required by local codes Standard Accessories Power cord USB interconnect cable Rack mount hardware BERTScopePC Standalone Software CD ROM installs the DPP125 s control interface on a user supplied PC Operating Requirements Place the instrument on a cart or bench The instrument should rest on its bottom or rear feet An optional rack mounting kit is available Observe the following clearance requirements and dimensions 0 mm 0 in Left and right sides 76 mm 3 in Bottom 0 mm 0 in standing on feet flip stands down Rear 0 mm 0 in on rear feet Width 394 mm 15 5 in Height 220 mm 8 7 in Before operating the instrument verify the ambient temperature 10 Cto 40 C 41 F to 113 F Preventing ESD A A direct electrostatic discharge can damage the instrument input To learn how to avoid this damage read the following information CAUTION Electrostatic discharge ESD is a concern when handling any electronic equipment The instrument is designed with robust ESD protection however it is still possible that large discharges of static electricity directly into the signal input may damage the instrument To avoid damage to the instrument use the following techniques to prevent electrostatic discharge to the instrument Discharge the static
8. ATA IN and DATA OUT connectors use 3 5 mm to APC Planar Crown adapters These facilitate user replacement of the adapter should it become damaged Replacement adapters can be ordered from Tektronix The adapter is secured to the connector with a captive threaded mounting ring Remove a damaged connector by grasping the knurled outer portion of the ring with your fingers and turning counter clockwise Do not allow foreign material to enter the connector body when replacing the adapter To install the replacement adapter position the two locating tabs in the corresponding slots of the instrument mounted portion of the connector and seat the adapter With the adapter in place align the retaining ring and tighten by rotating clockwise The connector should be tightened snugly finger tight To avoid over tightening and possibly damaging the connector do not use a tool to tighten it Fuse Replacement The instrument is protected by a fuse placed in series with the power line input The fuse is conservatively rated and should never open through the life of the instrument A blown fuse would generally indicate a problem with the instrument which requires factory service It is recommended that you arrange to have the instrument serviced if you experience a blown fuse Calibration The DPP125 uses digital calibration of the output buffers To maintain the accuracy of the output amplitude and offset annual calibration is recommended Contact Tektron
9. RTScope Analyzer 2 Connect the BERTScope Generator s Positive Data Output to the DPP125 Data Input 3 Connect BERTScope Generator s Subrate Clock Out to the DPP125 Clock In using a cable approximately 1 6 m 62 longer than the data cable 4 Loop back the DPP125 Outputs to the Analyzer Error Detector Inputs 5 Setthe SJ to 30 UI The particular SJ frequency is not crucial but should be set to a frequency that will be used during testing 6 Enable RJ and set its amplitude to the intrinsic value 7 Calibrate to remove the Clock to Data delay 8 Set Generator Delay to 1 UI DPP125 Digital Pre Emphasis Processor Quick Start User Manual 5 Configuration e 9 Run the Detector to check for error free operation If not operating error free advance the Generator delay by another gt UI The Detector should be operating error free at this point Record the Generator Delay 10 Once error free operation is obtained find the boundary between error free and errored operation by decreasing the Generator Delay and using a binary search method as shown in Figure 3 below Record the Generator Delay 11 Return the Generator Delay to the error free point found in step 2 12 Now find the boundary between error free and errored operation by increasing the Generator Delay and using a binary search as shown in the figure below Record the Generator Delay 13 Set the Generator Delay to the average of the Delay values foun
10. Tektronix BERTScope Digital Pre Emphasis Processor Quick Start User Manual www tektronix com Tektronix 0140 703 00 Tektronix BERTScope Digital Pre Emphasis Processor DPP125 Quick Start User Manual www tektronix com Tektronix 0140 703 00 Y CopyrightO Tektronix All rights reserved Licensed software products owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and BERTScope are registered trademarks of Tektronix Inc FastFrame OpenChoice iView iCapture Pinpoint RT Eye MyScope TekLink TekVPI Error Location Analysis and MultiView Zoom are trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Warranty Warranty All Tektronix DPP125 Digital Pre Emphasis Processor Instruments are covered under the standard 1 year product warranty Tektronix warrants that this product will be free from defects in materials and workmanship for a peri
11. al equipment for measurement control and laboratory use Equipment Type Test and measuring equipment Safety Class Class 1 grounded product Pollution Degree Description A measure of the contaminants that could occur in the environment around and within a product Typically the internal environment inside a product is considered to be the same as the external Products should be used only in the environment for which they are rated Pollution Degree 1 No pollution or only dry nonconductive pollution occurs Products in this category are generally encapsulated hermetically sealed or located in clean rooms Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becomes conductive due to condensation These are sheltered locations where neither temperature nor humidity is controlled The area is protected from direct sunshine rain or direct wind Pollution Degree 4 Pollution that generates persistent conductivity through conductive dust rain or snow Typical outdoor locations Pollution Degree Pollution Degree 2 as defined in IEC61010 1 Note Rated for indoor use only DPP125 Digital Pre Emphasis Processor
12. ates green with the instrument is operating The first time BERTScope Analyzer starts with the DPP125 attached the standard Microsoft Windows New Hardware Found message will appear as the driver automatically loads Select DPP Control in the Analyzer s View menu to open the interface a single view providing a complete control interface with the instrument TT Ste Cry Help Views 737 par Div Home A Generator Detector DPP Control Center Stressed Eye 548 my Physical Layer Test gt Error Analysis Editor Log Figure 4 Select DPP Control from the Control Console View menu DPP125 Digital Pre Emphasis Processor Quick Start User Manual 7 Operation Figure 5 DPP Control view STEP RESPONSE shows a plot of the time domain representation of the output waveform Each division on the time scale represents one unit interval of time which corresponds to the time each single tap is active The lower graph is a Bode plot showing the equivalent frequency domain response of the selected tap weight configuration In Figure 5 above the instrument is operating in straight through mode applying no change to the native response of the signal passing through it Use the STANDARD CONFIG button to save and recall setups similar to the way setups are stored in the BERTScope Click the DATA or DATA icon to set the output amplitude and offset voltages
13. d in steps 3 and 5 This is an approximate calibration point 14 Increase the SJ and RJ amplitudes to be larger than the amplitudes you plan to use for testing but not so high as to close the eye completely 15 Repeat steps 3 6 starting at the initial calibration point found in step 6 Use this as the calibrated Generator Delay This Delay value can continue to be used as long as the cabling setup remains the same Binary Search to Find Boundary Start here Move UI get errors Move Y UI Move UI no errors get errors Continue to Move Ys iterate to find get errors boundary Error free Errors Figure 3 Binary search method to fine tune the Clock to Data delay match 6 DPP125 Digital Pre Emphasis Processor Quick Start User Manual Operation Power On Connect the power supply cable to a properly grounded AC supply Setup The following provides an introduction to the DPP125 controls More details on any control can be obtained from the Help screen associated with the particular control Press the button green illumination should appear Ensure that proper precautions are observed against electrostatic discharge Using suitable high quality coaxial cables with APC 3 5 2 92 mm or SMA connectors connect to the front panel interface The power switch is an on off pushbutton located at the top right of the front panel A portion of the switch illumin
14. diately and both the time and frequency domain plots are updated to show the new response The DPP125 allows full freedom to set tap weights after the transition post cursor before the transition pre cursor or a combination of both The cursor is represented by a tap set to a 1 00 weight allowing the transition to appear at that point Use with Other Instruments DPP125 can be used with other vendors BERTs other instruments or standalone All of the instrument s functionality is accessible through the user interface provided by BERTScopePC Standalone software This software operates in a host PC running 32 bit version of Microsoft Windows Vista XP or 20007 64 bit versions are not supported Control communication is through USB 2 0 connection to the host computer rather than to a BERTScope Analyzer The software should be installed in the host PC prior to connecting the USB cable BERTScopePC software is distributed on a CD ROM which is supplied as a standard accessory with the DPP125 4 Microsoft Windows Vista Windows XP and Windows 2000 are registered trademarks of Microsoft Corporation DPP125 Digital Pre Emphasis Processor Quick Start User Manual Operation EEE Maintenance Cleaning The exterior of the instrument may be cleaned using a soft cloth dampened with a glass and office desk surface type cleaner Do not use solvent or abrasive cleaning agents Connector Replacement The D
15. ents when power is present Use Proper Fuse Use only the fuse type and rating specified for this product Wear Eye Protection Wear eye protection if exposure to high intensity rays or laser radiation exists Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation ii DPP125 Digital Pre Emphasis Processor Quick Start User Manual General Safety Summary Terms in this Manual These terms may appear in this manual A WARNING Warning statements identify conditions or practices that could result in injury or loss of life A CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property NOTE A notice statement identifies conditions which may result in unintended operating modes incorrect measurement results or require resetting the instrument or personal computers operating software interacting with it Symbols and Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product The following symbols may appear on the product WARNING Connectio
16. ervice the product b to repair damage resulting from improper use or connection to incompatible equipment to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES DPP125 Digital Pre Emphasis Processor Quick Start User Manual 1 General Safety Summary General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified NOTE Only qualified personnel should perform service procedures While using this product you may need to access other parts of a larger system Read the safety sections of the
17. ith a suitable power cable to match the local power outlet type RS232 Miniature type D connector this connector is not connected in the current production version of the instrument tint Help on Sub Rate Stress Gen PRBS 7 10 70001 Gbit s Det pres 7 1070001 Garis of em wa 2 apply jitter to the DPP clock input select Stressed Clock mode for the Subrate Clock on the BERTScope Generator view Clock Data Input Skew The DPP125 is a non linear processor that re clocks the input data Any skew between the Data In and Clock In signals will move the sample point in time appearing as a reduction in eye opening If the input signal has sufficient jitter present bit errors may appear in the DPP125 output when excessive clock data delay 15 present Applications which require processing of stressed data use the BERTScope Subrate Clock Out with the Stressed Clock output selected In this setup the subrate clock output phase leads the data output signal by approximately 5 4 ns To correctly compensate for the delay in the Data Out the cable interconnecting the Subrate Out to the DPP125 should be approximately 1 6 meters 62 inches longer than the cable connecting the BERTScope Data Out to the DPP125 Data Input With the additional cable length providing the rough delay match use the calibration method described below to fine tune the delay match 1 Connect the DPP125 to the BE
18. ix to schedule instrument calibration 10 DPP125 Digital Pre Emphasis Processor Quick Start User Manual Specifications Specifications System Data R te Bananen 1 12 5 Gb s Filter rasas nas FIR VS itachi 3 o ne 1 UI Tap Weight Range 100 100 including 0 Weight 1 or 0 1 dB Control USB 2 0 Clock Input CASA Single Ended SENS ii di 150 mV p p TEMO at 50 Q AC Coupled CONDE esaeen n e E E A E D EEEE E SMA Max Jitter Transfer 1 1 Data Input SENSIIVI sn 150 mV dacs 50 Coupled Comnectot asusto SMA Wienschel Planar Crown Data Output Differential ici AC Connector SMA Wienschel Planar Crown Amphtude are 0 1 8 Vp p O 0 to 500 mV Differential iii lt 2 ps typical Transition
19. mphasis Required for compliance testing of newer standards including PCIe 0 40GBASE KR 4 100GBASE CAUI 40GBASE XLAUL SAS De embed channel between stress source Calibrated stress testing at the DUT pin and DUT Documentation In addition to this Quick Start Guide the following documents are available Online Help Programmer Online Guide Options The DPP125 can be configured to include an optional 4 tap non linear signal conditioner Other Documentation Y our instrument includes PDF files of relevant information Remote Control Programmer Guide PDF Technical Specifications PDF 2 DPP125 Digital Pre Emphasis Processor Quick Start User Manual Installation Installation The 125 is intended to be operated in a controlled laboratory environment It is intended to operate on a bench top or on top of another instrument such as the BERTScope Bit Error Ratio Analyzer There are four shock absorbing feet located on the bottom of the instrument Operate the instrument only when positioned with the feet facing downward Do not operate the instrument with the long axis vertical standing on its side as this will block the path of air required for cooling This instrument uses a low voltage soft power switch that activates the power supply The primary power control circuitry is always live whenever the power cable is connected to the mains The instrument is fuse protected to reduce
20. n and Do not connect toor Mains Disconnected Mains Connected Protective Ground Chassis Ground High Voltage disconnection to remove from an OFF Power ON Power Earth Terminal hazardous bare uninsulated conductor that wire permitted is HAZARDOUS LIVE DPP125 Digital Pre Emphasis Processor Quick Start User Manual 111 Compliance Information Compliance Information This section lists the EMC electromagnetic compliance safety and environmental standards with which the instrument complies EMC Compliance EC Declaration of Conformity Meets intent of Directive 2004 108 EC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official Journal of European Communities EN 61326 1 2006 EMC requirements for electrical equipment for measurement control and laboratory 123 CISPR 11 2003 Radiated and conducted emissions Group 1 Class 1 61000 4 2 2001 Electrostatic discharge immunity 1EC61000 4 3 2002 RF electromagnetic field immunity 1EC61000 4 4 2004 Electrical fast transient burst immunity 1 61000 4 5 2001 Power line surge immunity IEC61000 4 6 2003 Conducted RF immunity 1 61000 4 11 2004 Voltage dips and interruptions immunity EN61000 3 2 2006 AC power line harmonic emissions EN61000 3 3 1995 Voltage changes fluctuations and flicker European Contact Tektronix UK Ltd Western Peninsula Western Road Bracknell RG12 IRF United
21. ncreasingly common method employed in systems to overcome the frequency dependent loss of low cost circuit boards to allow the passage of Gb s data The DPP125 covers the requirements for high data rate test allowing the flexibility to evaluate compliance to multiple standards and to explore the limits of device performance A key benefit of the DPP is the ease with which an engineer can adjust the precise characteristics of the pre emphasis signal being applied to the test device This is achieved through a highly intuitive control interface that simultaneously shows the step response tap weightings and frequency response of the signal in keeping with the BERTScope philosophy of multi domain insight Features and Benefits 1 to 12 5 Gb s range of operation with standard 3 tap configuration Optional 4 tap non linear signal conditioner available Pre cursor or post cursor adjustment Standards compliant Exceptionally easy setup DPP125 Digital Pre Emphasis Processor Quick Start User Manual 1 Documentation eaaa Concurrent multiple domain views including a frequency domain Bode plot Precise correction control for backplane ISI optical effects etc Adjustable through tap weights or step response Differential output is amplitude and offset adjustable Integrated operation with a BERTScope Bit Error Ratio Analyzer or in a standalone fashion controlled by a user supplied PC Features Benefits Controllable pre e
22. ne operation Full descriptions of the operating controls are given in the Online Help included in both the BERTScope Analyzer and BERTScopePC applications Detailed information on operation of the control interface can be accessed at any time through the Help menus included in any control view The instrument communicates with its control host via USB 2 0 When used with a BERTScope Analyzer connect the included USB cable between the Type B connector on the rear panel of the DPP125 and an available Type A connector on the rear panel of the Analyzer If a BERTScope Clock Recovery instrument 15 also being used with the Analyzer connect the DPP125 through an available USB connector on the rear panel of the Clock Recovery instrument When used standalone first install the BERTScopePC software and driver into the host PC Then connect the DPP125 USB cable to any available USB connector on the host computer Product Description This Quick Start User Manual supports the Tektronix BERTScope DPP125 Digital Pre Emphasis Processor The BERTScope DPP Digital Pre Emphasis Processor instrument provides programmable three tap or optional four tap pre emphasis for compliance testing to standards such as 802 3ap Serial Attached SCSI 10GBASE KR backplanes DisplayPort and USB 3 0 and flexible enough for the next generation 8 GT s Express standard Boosting amplitude of the transition bits in a digital signal or pre emphasis is an i
23. ocess in the Detector Other setup configurations may source the Error Detector clock from a clock recovery source or the DUT itself Connectors Front Panel DATA IN Single ended data signal input to processing FIR filter Input is AC coupled terminated into 50 ohms within the operating frequency range of the instrument Normally connected to the BERTScope Analyzer Pattern Generator DATA output CLOCK IN Single ended clock input used to clock the FIR filter Input is AC coupled terminated into 50 ohms within the operating frequency range of the instrument Normally connected to the BERTScope Analyzer Pattern Generator CLOCK output DATA OUT DATA OUT Differential data output from the FIR processor filter Output is 50 ohms from buffer amplifier Signal amplitude and offset are controlled through the user interface Normally connected to the Device Under Test Terminate unused outputs into 50 ohms if driving a single ended load Rear Panel USB IN USB 2 0 type B connector used to interface the instrument for control When used with a BERTScope Analyzer connect to any available USB connector The DPP125 can also be operated standalone with an 4 DPP125 Digital Pre Emphasis Processor Quick Start User Manual Configuration external PC When operated in this mode connect the USB connector to an available USB connector in the PC BERTScopePC software must be installed to support standalone operation AC POWER Connect w
24. od of one 1 year from the date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance All replaced parts modules and products become the property of Tektronix In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or s
25. ording to Directives 2002 96 EC and 2006 66 EC on waste electrical and electronic equipment WEEE and batteries For information about recycling options check the Support Service section of the Tektronix Web site www tektronix com Restriction of Hazardous Substances This product has been classified as Monitoring and Control equipment and is outside the scope of the 2002 95 EC RoHS Directive DPP125 Digital Pre Emphasis Processor Quick Start User Manual Table of Contents Table of Contents O AAA PP q 1 Product Description i vococicoconcoosiooiacicnns noninnsdn csi urinaionni suas bsos sooi vong sonido ner o ev ooo ernennen 1 Features and diia 1 DA 2 OPT 2 Other Documentation aussen 2 Tirta Meat PEN E EA AE EE N N A A 3 Standard Accessories ia 3 Operating miii aria adan eisen 3 Preventing nennen dades 3 4 NO santa 4 Clock Data Input SKEW 5 Operation AAA O A o A 7 O A RNA 7 Use with Other Instruments ee ase NC 9
26. similar to the corresponding function in the BERTScope Pattern Generator DPP125 Digital Pre Emphasis Processor Quick Start User Manual Filter response is controlled by setting the tap weights Click a mouse anywhere inside the Step Response plot to open this view PRES 7 6 250 00 Mbit s vet 6 250 00 4 if i Disabled 6 Setting Taps Tap weighing can be entered either directly by entering normalized tap weight values on the right side or by entering bit amplitudes on the left side Bit amplitudes can be expressed in units of either percent of normalized amplitude or dB The instrument converts a value entered in either format to the other updating both display windows simultaneously After changing a tap weight both the time and frequency domain plots are updated to show the new response The setting change becomes effective immediately altering the response in the output Select either of two views for the center plot step response as shown or tap weight setting The tap weighing can be entered directly by entering normalized tap weight values in the fields on the right side or by entering bit amplitudes on the left side Bit amplitudes can be expressed either in a percentage of normalized amplitude or dB The instrument translates an entered value into both formats updating both display windows simultaneously A tap weight change becomes effective imme
27. voltage from your body by wearing a grounded antistatic wrist strap while connecting and disconnecting cables and adapters The instrument provides a front panel connection for this purpose cable that is left unconnected on a bench can develop a large static charge Discharge the static voltage from all cables before connecting them to the instrument or device under test by momentarily grounding the center conductor of the cable or by connecting a 50 Q termination to one end prior to attaching the cable to the instrument DPP125 Digital Pre Emphasis Processor Quick Start User Manual 3 Configuration Configuration The typical configuration with the BERTScope Analyzer is shown below Pre Emphasized PG Output to Device Under Test BERTScope DPP125 Figure 1 DPP125 BERTScope Analyzer Setup Configuration The DPP125 data output signal is differential while the input data and clock are single ended Because the output signal is re clocked and buffered low loss cables are not required for the input signals To maintain amplitude calibration and minimize intersymbol interference 151 high performance cables should be used to connect the DPP125 output to the Device Under Test In the illustrated configuration the BERTScope Analyzer Error Detector is clocked directly from the negative clock output of the Pattern Generator The inverted phase along with any phase delay in the cables or DUT is corrected by the Auto Align pr
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