Home

80E10 User`s Guide

Contents

1. Common mode TDR 15 Take a 16 measurement 36 10 14 measurement cont The Step Deskew is adjustable for both channels Adjust the step deskew to set the time at which the step generator for the right channel asserts the TDR step relative to the left channel and vice versa Notice that the edges moves horizontally relative to each other Adjust the step generator steps to divide the mismatch between channels equally between the incident step and the reflections After dividing the mismatch equally between channels using Step Deskew adjust Channel Delay to align the front edge of the reflections If needed next adjust the Channel Deskew For more information see Adjusting TDR Step Deskew on page 39 Press the SETUP DIALOGS button Adjust the VERTICAL 2 5 p in this example and HORIZONTAL SCALE 2 ns in this example to show a trace similar to that shown Leave at least one division of baseline trace to the left of the first rise The first rise of this trace is the incident TDR step leaving the sampling module the second rise is the reflection of the step returning from the end of the cable Notice that both channels assert a positive TDR step for common mode TDR When the TDR steps on the two channels are the same polarity both positive or negative you can define a math waveform that represents the average common mode signal by pressing the VERTICAL MENU button selecting the Vert tab s
2. As a result measurements are not generally taken in absolute units such as volts Instead TDR measurements are made on a relative scale called reflection coefficient and abbreviated as o The definition of o is the reflected signal amplitude divided by the incident signal amplitude For example if a 100 millivolt reflection results from a 1 volt incident step the reflection is called a 100 millirho reflection o Ereftected Eincident 100 m 100 mV 1 V Given a known impedance and a measured reflection coefficient the unknown impedance that caused the reflection can be calculated from the following equation zi E reflected Z A o p E incident Zr Zo where Zo is the known impedance o is the measured reflection coefficient and Z1 is the unknown impedance An alternate form of the equation is Figure 16 shows a typical waveform from a Tektronix TDS oscilloscope or CSA analyzer equipped with an 80E08 or 80E10 TDR sampling module In this case the instrument is connected through a 50 Q coaxial cable to a 75 Q device under 80E07 80E08 80E09 and 80E10 User Manual 31 Reference test The incident step is about 2 divisions in amplitude and the reflection from the device under test is about 0 4 division high These numbers equate to a reflection coefficient of 0 20 0 4 divisions divided by 2 divisions Inserting the known 50 Q level and the reflection coefficient into the above equation yields the 75 Q value
3. is a fault but it also tells you the magnitude and the distance to that fault TDR can note any change in the characteristic impedance of the device under test DUT Any change in the impedance is shown on the TDR display as an upward bump or downward dip in the waveform depending on the type of event see Figure 13 for example discontinuities in a microstrip Conductor Volts or o A Open Connector Capacitive Inductive Circuit y discontinuity discontinuity a Incident step Round trip time Figure 13 Microstrip discontinuities 80E07 80E08 SOE09 and 80E10 User Manual Reference Cause of Reflections The reflections that a TDR displays and measures are caused by changes in the impedance of the path of the step circuit board cable or integrated circuit Any significant change in impedance will cause a reflection As an example if an open solder connection exists on a circuit board you can see that change with TDR TDR also displays changes in the conductor resistance For example if there is corrosion in a joint and there is high resistance at that point this is seen by a TDR TDR also displays changes in capacitance If you think of the TDR display in terms of bumps and dips it tends to make interpretation a lot easier A bump upward deflection indicates a higher imped ance event such as an open see Figure 14 or a reduction in line width see Figure 13 A dip d
4. that is not using product software version 2 5 or greater may cause the applica Lion to fail to start To display the version installed select About from the Help menu of the main instrument This manual is composed of the following chapters m Getting Started shows you how to configure and install your sampling module m Operating Basics describes controlling the sampling module using the front panel and the instrument user interface m Reference provides additional TDR information m Specifications provide a list of guaranteed and typical specifications 80E07 80E08 80E09 and 80E10 User Manual ix Preface Related Manuals For information of the main instrument in which the sampling module is used refer to the documents and online help provided with your main instrument The programming commands for these modules are listed in the programmer guide for the main instrument X 80E07 80E08 SOE09 and 80E10 User Manual E Getting Started The Tektronix 80E07 80E08 80E09 and 80E10 remote sampling modules are high performance sampling modules that can be installed in the following instruments m DSA8200 Digital Serial Analyzer m CSA8000 CSA800B and CSA8200 Communications Signal Analyzers m TDS8000 TDS8000B and TDS8200 Digital Sampling Oscilloscopes Proper operation of the electrical sampling modules requires that product software version 2 5 or greater be installed on the main instrument NOTE The
5. 8 mm apart measured from center of hole Once you ve secured the guide rail to a surface slide the remote module onto the rail engaging the tracks on the bottom of the remote module NOTE The tracks on the remote module and guide rails must be properly mated to ensure a firm attachment One track on the module is larger than the other The larger track must engage the ball plungers on the guide rail See the detail in Figure 4 Using the End Plate The end plate mounting holes also allow you to create a stable environment for Mounting Holes the remote modules There is one hole in each module end plate one in the front end plate and one in the rear end plate You will need to provide the mounting apparatus to use with these mounting holes The front and rear end plate spacing is 2 95 inches 75 0 mm and the mounting holes are located co axially in line as shown in Figure 4 Each mounting hole is threaded for a 4 40 machine screw to a depth of 0 38 inches 9 5 mm The bottom of the mounting holes are closed in order to prevent accidental damage to the internal circuits of the remote module from the machine screws CAUTION Do not use machine screws in the end plate mounting holes that can protrude deeper than 0 38 inches 9 5 mm Such screws may bottom out in the closed mounting holes and damage the screw threads or break off 80E07 80E08 80E09 and 80E10 User Manual 7 Getting Started End plate mou
6. 80E07 80E08 SOE09 and 80E10 User Manual Reference Overview To take a TDR measurement cont Take cursor 23 Press the SETUP DIALOGS button and select the measurements Cursor tab 24 Select the Waveform cursor type 25 From the pop up list for each of Cursor 1 and Cursor 2 select your TDR source 26 Press the SELECT button to toggle selection between the two cursors The active cursor is the solid cursor 27 Turn the Adjust knob to position each cursor on the math waveform to measure the feature that interests you 28 Read the results in the cursor readout In this figure waveform cursors are used to measure Av and At of the waveform which could be used to compute its slope dv dt 80E07 80E08 80E09 and 80E10 User Manual Control elements amp resources SETUP DIALOGS Click to access sources Cursor 1 AC Select gt Source source from pop up list Main 3 4 vica DEFAULT l SETUP cursors sacr ACQUISIT ON SELECT button Adjust knob File Edt View Setup tities Applications Help Tico e a 0009 x n A vv ni 2 Rit Aca Mode Average Win Dal ay Ha Pulso Aoivae n um sum East Gea i l e aca Un Units v2 113 3mp dy 897 5mp Wo 18 72ns 2 2532s at 5 800ns 178 6MH2 kis ist tel El b S Ey Se ae eT 11 18
7. AM 20 00 Ic Eoo amp E Cursor readout 27 Reference TDR Measurements Background 28 TDR is based on a simple concept Whenever energy transmitted through any medium encounters a change in impedance some of the energy is reflected back toward the source The amount of energy reflected is a function of the trans mitted energy and the magnitude of the impedance change The time lapse between energy transmission and the reflection returning is a function of the distance from the source to the impedance discontinuity and the propagation velocity An example of this concept is the echo you hear when sound encounters a wall and bounces back In electrical systems a similar phenomenon occurs when electrical energy traveling in a transmission line encounters a change in impedance Any change in the impedance of the transmission line such as a variation in the width of a circuit board trace causes a reflection with an amplitude that is related to the magnitude of the impedance change A Time Domain Reflectometer sends out a step signal on the cable circuit board or integrated circuit under test The reflection or echo received by the TDR is measured to find events along the path of the step Reflections are caused both by events that are expected such as width changes and components and by those that shouldn t be there such as bridges shorts and opens The strength of a TDR measurement is that it not only tells you there
8. DC accuracy requirements after compensation has taken place For operation over 10 40 C a temperature tolerance of 2 C guaranteed 5 C typical relative to the compensation temperature is permitted If sampling module is moved to a different compartment or mainframe re compensation must be done 2 mV system offset offset 0 007 assigned offset system offset gain 0 02 vertical value assigned offset system gain offset gt System deviation from linear least squares fit at the maximum bandwidth setting 10 mV DC to 30 GHz better than 3 dB DC to 30 GHz better than 3 dB DC to 60 GHz better than 3 dB DC to 50 GHz better than 3 dB 20 GHz 40 GHz 30 GHz Estimated based upon assumed 0 35 calculated product of typical bandwidth and risetime 60 50 GHz 40 GHz 30 GHz 20 GHz 11 67 ps 17 5 ps 11 67 ps 17 5 ps 5 83 ps 8 75 ps 11 67 ps 7 ps 8 75 ps 11 67 ps 80E07 80E08 SOE09 and 80E10 User Manual Specifications Table 5 Electrical sampling modules Signal acquisition cont Specifications Step response aberrations typical 7 Random noise displayed 80E07 80E08 80E09 80E10 Random noise displayed typical 80E07 80E08 80E09 80E10 Acquisition delay adjust range typical Acquisition delay adjust resolution Characteristics 1 or less over the zone 10 ns to 20 ps before step transition 6 10 or less over the first 400 ps following
9. Damaged Inputs Checking For Damage Because of their technology high bandwidth sampling modules are vulnerable to damage through static discharge and overvoltages EOS to their inputs Damage can occur instantaneously Under most conditions when EOS damage occurs the trace will be flat It typically involves short period high current discharge The damages can be blown diodes as indicated by a large offset or no response to input To check for damage use one of the following procedures m If checking a TDR capable sampling module attach a 50 Q termination to the channel input and perform a TDR measurement of the attached fitting Adjust the HORIZONTAL SCALE to 500 ns per division This should display the entire TDR step from edge to edge Display the step top at 40 mo per division and check for flatness If the top is bowed sagged hooked or tilted assume static has damaged the module and service is required See Figure 17 m If checking a non TDR sampling module use a similar procedure as just described but use an external step source mo oot TUTO Errr r25D 0mp 5 DD Onsfdiv Figure 17 TDR step of undamaged sampling module EOS Electrical Overstress Prevention 46 EOS occurs when an electronic device is subjected to an input voltage higher than its designed maximum tolerable level Similar to ESD Electrical Static Damage EOS usually is also related to static charges generated by moving elements
10. a Tektronix 80A02 EOS ESD Protection Module to protect the sampling module from damage due to static discharge from circuit boards and cables Use the 80A02 in applications where large static charges can be stored on the device under test such as when testing TDR circuit boards or cables Refer to the documentation supplied with the 80A02 module for proper installation and use Compensation After installing a sampling module or after moving a sampling module from one compartment to another you should run Compensation from the Utilities menu to ensure the instrument and modules meets their specifications For instructions on running a compensation see Optimizing Measurement Accuracy in your main instrument Quick Start User manual or the online help 80E07 80E08 80E09 and 80E10 User Manual 9 Getting Started 10 80E07 80E08 SOE09 and 80E10 User Manual SEE a Operating Basics This chapter makes you familiar with the operation of your sampling module It describes the controls and connectors interaction of the sampling module with your instrument programming the sampling module and user adjustments Usage Figure 5 shows the sampling module and remote modules and identifies the buttons lights and connectors apply a voltage greater than the Maximum Input Voltage see page 49 for your CAUTION To prevent damage to your sampling module or instrument do not sampling module To prevent electrostatic damage to
11. and display the first reflected edge 80E07 80E08 80E09 and 80E10 User Manual Operating Basics Detailed information on this dialog box can be found in the online help accessed from the main instrument Wm Database Hist Cursor Meas Vert Horz Acq Trig Phase Ref Mask TDA Dip Preset TDR Step ACG OnPolarity On Units i pae ae der raj IET r Step Deskew 1 Tum ce oos aH OFAI eps TDR Autaset Properties Help Figure 7 TDR Setup dialog box Programmer Interface Commands The remote programming commands for all modules are documented in the online programmer guide User Adjustments All sampling module setups parameters and adjustments are controlled by the main instrument To save recall or change any module settings use the instrument menus or front panel controls or consult the online help accessed from the main instrument 80E07 80E08 80E09 and 80E10 User Manual 15 Operating Basics Cleaning 16 The module case keeps dust out and should not be opened Cleaning the exterior of the main module is usually confined to the front panel If you need to clean the case remove the module from the main instrument but first read the entire Installation procedure starting on page 6 for proper handling of the module WARNING To prevent injury power down the instrument and disconnect it from line voltage before performing
12. describes proper care and use of the connector and adapter for electrical modules including protection against electrostatic discharge ESD cleaning connectors and the assembly and torquing of connectors Electrostatic Discharge Protection against ESD is essential while connecting inspecting or cleaning connectors attached to a static sensitive circuit Static discharges too small to be felt can cause permanent damage and devices under test can carry an electrostat ic charge To prevent damage to devices and components use the procedures that follow Overview To protect against ESD Control elements amp resources ESD prevention Always use a grounded antistatic mat in front of your test equipment 2 Always wear a heel strap when working in an area with a conductive floor even if you are uncertain about its conductivity 3 Always wear a grounded wrist strap having a 1 MQ resistor in series when handling components and devices or when making connections to the test set ESD procedures cH2 Connect your wrist strap to the antistatic connector on the front of your instrument Refer to the illustration at right Connect 7 On ta i wrist strap 2 When cleaning ground the hose nozzle to prevent ESD 3 Setthe pressure correctly See Cleaning Connectors on page 42 Visual Inspection Visual inspection and if necessary cleaning should be done every time a connection is made Makin
13. open end of cable Incident TDR step Wfm Database N Hist Cursor Meas l Vert Hoz Acq Trig Phase Ref Mask Dip Preset TDR Step ACQ Enable 3 mon 0 On Units gps se AlE Diff ap iil rm 8 eer 80E07 80E08 80E09 and 80E10 User Manual Reference Overview To take a TDR measurement cont Control elements amp resources Specifying hori 12 Select the HORIZONTAL tab E zontal timebase a units 13 Select the Distance radio button Use this control to Distance specify the type of units to use for the horizontal axis for button Units all timebases You can select from seconds bits or C Seconds Bis distance The timebase scale and position controls adopt the units you select Comm Standard 14 If your application requires it you can also set either of Bit Rate Jo 4523200 ope the following controls they interact so set one or the Distance other Type of I Init meters m Enter a Dielectric Const eps value to match that units Dielectric Const eps fi EE of the device under test Prop Velocity 299 792Mimds E Enter a Prop Velocity value to match that of the device under test 15 Press the SETUP DIALOGS button 16 Continue with the automatic measurement process on the following page 80E07 80E08 80E09 and 80E10 User Manual 25 Reference Overview Take automatic measurements 26 To take a TDR measurement co
14. place the module in a compartment and slowly push it in with firm pressure Once seated turn the hold down screw to tighten the module into place See Figure 3 CAUTION To prevent damage to the module or instrument never install or remove a module when the instrument is on or when input connectors are unprotected NOTE When removing your sampling module first loosen the hold down screw and then use the module ejector on the main instrument to eject the module CE C3EE COE Cc d Gre Ca Gay c cC tae ln oc oco 0 amc co con EXE res peo d omo S Large modules o o Module ejectors Small modules gt o O O O oQo oQo Hold down screw gt lS E e Am Figure 3 Sampling module compartments At least one sampling module must be installed in an instrument to sample signals 80E07 80E08 80E09 and 80E10 User Manual Getting Started NOTE Refer to the Quick Start User manual for your instrument about the interaction between large and small module compartments Using the Guide Rails The guide rails allows you to create a stable environment for the remote modules One guide rail is provided for each remote module Attach the guide rail to a fixture or desktop using the two mounting screws provided The holes in the fixture must have 4 40 threaded holes spaced 1 25 inches 31
15. step transition 0 4 or less over the zone 400 ps to 3 ns following step transition 1 2 or less over the zone 3 ns to 100 ns following step transition 1 or less after 100 ns following step transition 30 GHz o ee o e Senos 410 uVavs 410 uVavs 30 GHz oc 200 Vans o 800 Vans 800 uVavs 800 uVavs 250 ps each channel 135 fs 20 GHz lt 380 uVams lt 380 uVams 20 GHz lt 280 uVams lt 280 uVams 1 Offset range and or sensitivities may be constrained where the Maximum Operating Range could be exceeded Vertical nondestruct range defines the maximum range over which offset plus peak input signal can operate without irreversible damage to the instrument Operation to instrument specification is not guarantied outside of the vertical operating range 3 The base sensitivity ranges from 10 mV to 1 V full scale in a 1 2 5 sequence of coarse settings Between coarse settings the sensitivity can be finely adjusted with a resolution equal to 1 mV 80E07 80E08 80E09 and 80E10 User Manual 51 Specifications 52 Table 6 Electrical sampling module TDR system 80E08 and 80E10 Specifications Number of TDR channels TDR operation modes TDR maximum input voltage TDR reflected edge rise time 80E08 80E10 TDR reflected edge rise time typical 80E08 80E10 TDR incident edge rise time typical 80E08 80E10 TDR incident edge amplitude
16. the second channel is not connected to the same device as the first channel crosstalk is displayed as opposed to the step transmitted through the device automatic measurements on page 26 or Take cursor measurements on page 27 Control elements amp resources Device under test 80E07 80E08 SOE09 and 80E10 User Manual Reference Adjusting TDR Step Deskew Overview Prerequisites Adjust TDR step deskew e When making differential or common mode TDR measurements the two steps must arrive at the same time at the reference plane usually the connection point to the device under test To adjust the TDR step deskew perform the following steps Either disconnect the transmission cables from the device under test DUT at the point where the cables connect to the device or short both lines to ground at the DUT Set channel deskew and channel delay to zero Then from the TDR setup window adjust the TDR Step Deskew so that the propagation delay TO between the incident edges is equal to the propagation delay between the reflected edges as shown in the figure Both channels have adjustable TDR Step Deskew First select one channel and adjust the step deskew Next if needed select the second channel and adjust its step deskew to obtain the correct propagation delay If using a math function do not adjust the step more instead adjust channel deskew and
17. HIS 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 ENSE AEN Table of Contents General Safety Summary cc cece cece cece eee e ee cees v Environmental Considerations 0 ccc cee ee cee eeceees Vii Preface i eive s rM ER OUR ERE ER ER AYER RO RR ix Manual Strctire 222 een dee ec cate a ER a eee ces ix Related Manuals us ema ca red ea Wea a s X G tting Started i35 oce eR eA OAR Rs 1 Product Descriptions iss facie sec e LE ege eec E ead 2 Accessories and Options 0 cece cece hn 4 Standard Accessories oaii oi aat irin A E eee eee A E e eens 4 Optional Accessories osis inao s RUE UR hee ei E A 4 Options sete Mot i DEL OE Su qv s ee A 5 Installation e x nv Magi gu NEE cx Eden MO POO CEA DUE 6 Electrostatic Discharge lseeeeeeeeee eee eee ee 8 Static Controlled Workstation 0 0 cece eee eee 9 Compensation 2452 os BAe ce RAS m quem 9 Operating Basics so
18. However unlike ESD that typically deals with thousands of volts 80E07 80E08 80E09 and 80E10 User Manual Reference EOS can occur at a low voltage level For Tektronix 80E00 series modules EOS damage could occur at levels as low as 10 V EOS can have a cumulative effect repetitive EOS causes incremental damage over time and results in sampling function deterioration Prevention Standard ESD precautions are not very effective for EOS damage prevention This is particularly true when the DUT Device Under Test is isolated from any reference voltage levels including the ground level To prevent EOS damage of 80E00 series modules strictly follow these EOS prevention requirements m Observe all ESD prevention procedures m Before letting the probe tip touch the device under test use a ground conducting element to discharge any residual charge at the test point m While measuring the DUT make sure that no nearby personnel or objects are moving since this can induce spurious charges on the probe head Such charges can easily reach levels of several hundred volts m For non critical applications proper usage of a static isolation unit such as the Tektronix 80A02 EOS ESD Protection Module can safely discharge the residual charges and protect the modules from EOS damages Checking For Damage If the waveform top is bowed sagged hooked or tilted assume static has damaged the module and service is required Figure 18 on page 48 s
19. NET EXP M Z so Lo3 75Q Notice that the instrument automatically performs this calculation and displays the impedance 2 or reflection coefficient o for each cursor and the difference between the two cursors 50 Q line 75 Q line 50 Q line 75 Q line Figure 16 TDR step and reflection 50 Q line terminated in 75 Q 32 80E07 80E08 SOE09 and 80E10 User Manual Reference Making Accurate TDR Measurements A number of issues must be considered to make accurate TDR measurements In general it is relatively easy to make impedance measurements near the reference impedance usually 50 2 Higher accuracy or measurements farther from the reference impedance requires more care The following list covers a few key considerations in making accurate and repeatable impedance measurements Resolution Resolution determines the shortest impedance discontinuity that a TDR instrument can measure Because of round trip effects Resolution 1 2 System Reflected Rise Time If a discontinuity such as a variation in the width of a trace is small with respect to the system rise time the reflection will not accurately represent the impedance of the discontinuity In extreme cases the discontinuity may effectively disappear System rise time is the combined rise time of the step generator TDR the instrument and the interconnect between the TDR and the circuit under test In genera
20. OE09 and 80E10 User Manual REE SENIUM Specifications This section contains specifications for the 80E07 80E08 80E09 and 80E10 remote sampling modules All specifications are guaranteed unless noted as typical Typical specifications are provided for your convenience but are not guaranteed Specifications that are marked with the symbol are checked in Performance Verification procedures provided in the Specifications and Performance Verification manual for your main instrument All specifications apply to all models of sampling module unless noted otherwise To meet specifications these conditions must first be met m The instrument must have been calibrated adjusted at an ambient tempera ture between 20 C and 30 C W The instrument must have been operating continuously for 20 minutes within the operating temperature range specified m The instrument must be in an environment with temperature altitude humidity and vibration within the operating limits described in these specifications A compensation must have been performed Recompensation is required if a module is moved to another compartment Table 5 Electrical sampling modules Signal acquisition Specifications Real time accessory interface Extender accommodation Number of input channels Input connector 80E07 and 80E08 80E09 and 80E10 Input impedance Vertical dynamic range non clipping Vertical operating range maximum Vertical nondestruct
21. User Manual Tektronix 80E07 80E08 80E09 and 80E10 Electrical Sampling Remote Modules 071 2038 01 This document applies to firmware version 2 5X and above www tektronix com Copyright Tektronix All rights reserved Licensed software products are 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 supercedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered 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 m In North America call 1 800 833 9200 m Worldwide visit www tektronix com to find contacts in your area Warranty 2 Tektronix warrants that this product will be free from defects in materials and workmanship for a period 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 t
22. V TDR aberrations incident edge 2 TDR incident edge delay adjust range typical TDR incident edge delay adjust resolution typical TDR maximum repetition rate Characteristics 2 Step output with positive edge polarity negative edge polarity and off independently selectable each channel Specifications are not guaranteed with any DUT applying signal Do not apply external signal during TDR operation 22 ps or less each polarity 16 ps or less each polarity 20 ps or less each polarity 15 ps or less each polarity 18 ps or less each polarity 12 ps or less each polarity 250 mV step into 50 C2 At maximum sampler bandwidth setting both polarities of TDR 1 or less over the zone 10 ns to 20 ps before step transition 12 2 or less over the zone 14 ps to 400 ps following step transition 2 or less over the zone 400 ps to 5 ns following step transition 1 2 or less over the zone 5 ns to 100 ns following step transition 1 after 100 ns following step transition 250 ps each channel and each plarity 135 fs 200 kHz 1 IEEE std 1057 section 4 8 2 transition duration of step response 2 EEE std 1057 section 4 8 4 overshoot and precursors 80E07 80E08 SOE09 and 80E10 User Manual Specifications Table 7 Electrical sampling modules Timebase system Specifications Horizontal position range Characteristics Minimum horizontal position setting is 29 ns external d
23. a current Tektronix catalog for additions changes and details Table 3 Optional accessories Item Part number 2X attenuator SMA male to female 015 0013 5X attenuator male to female 015 1002 xx Power divider 015 0565 xx SMA accessory kit 020 1693 xx 3 5 male to 3 5 female SMA 015 0552 xx Slip on SMA connector 015 0553 xx 3 5 mm 50 connector SMA male to female 015 0549 xx BNC female 75 2 to 50 2 type N minimum loss attenuator 131 0112 xx Terminator ECL 015 0558 xx 80E07 80E08 SOE09 and 80E10 User Manual Getting Started Table 3 Optional accessories cont Item Connector saver 3 5 mm SMA 80E07 80E08 80E09 and 80E10 Remote Sampling Module User Manual printed Part number 015 0549 xx 071 2038 xx Options The following options can be ordered for the module Option C3 Three years of calibration services Option C5 Five years of calibration services Option D3 Test Data for calibration services in Option C3 Option D5 Test Data for calibration services in Option C5 Option R3 Repair warranty extended to cover three years Option R5 Repair warranty extended to cover five years 80E07 80E08 80E09 and 80E10 User Manual 5 Getting Started Installation The sampling modules fit into the front panel of any of the main instruments listed Getting Started on page 1 To install a module first turn off the instrument using the front panel On Stand by switch Then
24. any cleaning Clean the exterior surfaces of the modules or cables with a dry lint free cloth or a soft bristle brush If any dirt remains use a damp cloth or swab dipped in a 75 isopropyl alcohol solution Use a swab to clean narrow spaces around controls and connectors Do not allow moisture inside the modules Do not use abrasive compounds on any part of the cases or cables that may damage them CAUTION 7o prevent damage avoid the use of chemical cleaning agents which might damage the plastics used in this instrument Use a 75 isopropyl alcohol solution as a cleaner and rinse with deionized water Use only deionized water when cleaning the menu buttons or front panel buttons Before using any other type of cleaner consult your Tektronix Service Center or representative Do not open the case of the module or the remote modules There are no user serviceable components and cleaning the interior is not required 80E07 80E08 SOE09 and 80E10 User Manual Reference This chapter contains the following sections m Taking TDR Measurements describes how to use the 80E08 and 80E10 to perform time domain reflectometry TDR measurements m TDR Measurements Background contains information that describes the cause of reflections measurement range the velocity of propagation and measuring mismatches measurement units and considerations for making accurate measurements m Taking Differential and Common Mode TDR Measurements
25. c sve e ey n eh nho Re m on RR RD Re 11 Usage ey vun ERU ah Sas ae EE ERI CM DW eed Os SS 11 CONOIS NEL IE a 12 Signal Connector 4 i eu gebe e es edd acc De eO Sae ee 12 Channel Selection ig eis a xe er icti e P Dena QR CRT 13 TekProbe Connector o sux elo e e aci teh ec 13 TDR On Indicator 4 cepe Re eR Rn RO GR ORE SOR QC IC RUN S 13 System Interaction 11 ze ee ete ates aia I Da eed see eects 13 Commands From the Main Instrument Front Panel 04 14 Programmer Interface Commands eeeeeeeeeeeeee eee 15 User Adgustm hls inca ned wate in eR Rec QE et a Ic GR PR RD as 15 Cleaning REPE 16 R f rence ui 8088 ae BES OAS NE CENE SEE DEA e 17 Taking TDR Measurements 0 cee eee E E EN G 17 TDR Measurements Background 00 cece eee eee eee 28 Finding the Velocity of Propagation and Locating Mismatches 31 TDR Measurement Units 0 0 cee eee eee eee eee 31 Making Accurate TDR Measurements 0 2 00 cee eee eee ee 33 Taking Differential and Common Mode TDR Measurements 33 Connector and Adapter Care Requirements 000 02 eee eee 41 Visual Inspection c uua nee bebo once ae ded seas ere ge ed 41 Cleaning Connectors esorare n cece eee ene nen ene 42 Assembly and Torquing 2 0 ccc eee eee eee eee 44 Detecting Damaged Inputs 0 0 eee cece eee eee 46 EOS Electrical Overstress Prevention cesse 46 Specifications Soe
26. ce 58 Incident step 58 Initialize 58 Input voltage maximum 11 Installation 6 Internal clock 58 Manuals part numbers 4 Measurements automatic 26 cursor 27 Measurements TDR 17 33 57 Index 0 Operating basics 11 Optional accessories list 4 Options list 4 P Product description 2 Programmer commands 15 Propagation delay adjustment TDR 39 R Reference 17 Reference plane 39 Recycling vii Rho units selecting 24 S Safety summary v SELECT CHANNEL button 13 Setting 58 Signal connector 12 Specifications 49 Standard accessories 4 Static controlled workstation 9 Step deskew TDR 39 Step generation TDR 17 Step generator operation 18 19 20 System interaction 13 T TDR 58 adjust channel deskew 40 cause of reflections 29 changing graticule units 24 58 common mode 33 36 common mode measurements 34 differential and common mode measurements 37 differential measurements 34 differential mode 33 enable differential measurements 36 example measurements 22 34 finding velocity of propagation 31 locating mismatches 31 measurement range 30 measurement units 31 measurements 17 33 Measurements background 28 on indicator 13 propagation delay adjustment 39 step deskew 39 step generation 17 taking accurate measurements 33 taking horizontal measurements 25 taking measurements 34 36 37 39 to take a measurement 22 undamaged sampling m
27. channel delay as shown in the following step 80E07 80E08 SOE09 and 80E10 User Manual modules Channel Offset Deskew Delay 0 000 EE 4241 ND Deskew TDR Autoset Properties Adjusting TDR step deskew Control elements amp resources Device under test H 0 03 ERU zm e zl Jp 000 ge ofan A Step arrival at DUT l rma rra _Hep 39 Reference Overview Adjusting TDR step deskew cont Control elements amp resources Adjust channel For some measurements math summing and comparisons ee deskew you may want to visually line up the reflection edges of both oe TDR steps even though you have delayed the step assertion a time for one channel in the preceding step 4 Todo this first deskew the TDR steps as shown in step 3 then from the Vertical setup window deskew the channels The 80E08 and 80E10 modules have channel delay capabilities When deskewing channels set the Channel Deskew to zero then use the Channel Delay control to align the reflected edges If needed then use the OV Channel Deskew control oV lt Align using channel deskew NOTE For further information about deskew and an alternate TDR deskew method refer to the Quick Start User Manual for the main instrument 40 80E07 80E08 SOE09 and 80E10 User Manual Reference Connector and Adapter Care Requirements This section
28. describes how to use the TDR capable sampling module to perform differential and common mode TDR measurements m Connector and Adapter Care Requirements describes proper care and use of the connectors and adapters including protection against electrostatic discharge ESD cleaning connectors and the assembly and torquing of connectors m Detecting Blown Inputs describes how to check for damage on a sampling module m EOS Electrical Overstress Prevention describes the causes and prevention of EOS and how to check for EOS damage Taking TDR Measurements Why Use What s Special Keys to Using This section describes how to use the 80E08 and 80E10 sampling modules to perform TDR measurements To take TDR measurements on transmission lines Using TDR you can measure the impedance along a transmission line and determine the distance to an impedance change Vertical can be scaled in volts rho or ohms units Read the following topics they provide details that can help you set up and take effective TDR measurements TDR Step Generation Both channels in the 80E08 or 80E10 TDR sampling module have a selectable polarity step generator which gives both channels 80E07 80E08 80E09 and 80E10 User Manual 17 Reference 18 individual measurement capabilities You can use the outputs of both generators to perform differential and common mode TDR measurements The step generator circuitry fundamentally consists of a po
29. ds while they are connected to a voltage source Ground the Product This product is indirectly grounded through the grounding conductor of the mainframe 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 Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Do Not Operate Without Covers Do not operate this product with covers or panels removed Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Avoid Exposed Circuitry Do not touch exposed connections and components when power is present 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 80E07 80E08 80E09 and 80E10 User Manual V General Safety Summary Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices t
30. e of this waveform is the incident TDR step leaving the sampling module the second rise is the reflection of the step returning from the end of the cable For your device under test DUT you may need to adjust the Horizontal SCALE POSITION and Reference to display the reflections from your DUT near the left of the graticule To locate reflections from your DUT disconnect your probe or cable at the DUT and look for the reflection from the open end of the probe or cable Assuming the line to be tested is an open end microstrip on a circuit board and that you probe or cable is now connected to the line you will see the new open reflection to the right according to the length of the line There may be a visible disturbance where the connections is made to the board for example see Figure 13 on page 28 The area between the entry to the board and the open reflection at the end of the board is the target area for your TDR measurements Adjust Vertical SCALE Vertical POSITION Horizontal SCALE and Horizontal POSITION as necessary for a good quality display of the measurement area The units of measure commonly used in TDR are units of rho o measured on the vertical axis You can change the measurement units by using the ACQ Units selector in the TDR Setups dialog box Press the SETUP DIALOGS button and select the TDR tab Select either V for Volts p for rho or O for ohms Control elements amp resources Reflection from
31. eaned with compressed air or nitrogen apply a small amount of isopropyl alcohol to a lint free cleaning swap A standard foam tipped swap is recommended Clean the connector threads After the alcohol evaporates blow the threads dry using low pressure compressed air or nitrogen Make sure the threads are completely dry before using Using a small amount of isopropyl alcohol on a lint free cleaning swap clean the mating surfaces of the center and outer conductors After the alcohol evaporates blow the mating surfaces dry using low pressure compressed air or nitrogen Make sure the connector is completely dry before using Inspect the connectors to make sure they are clean and undamaged Refer to Visual Inspection on page 41 80E07 80E08 80E09 and 80E10 User Manual 43 Reference Assembly and Torquing Overview Prerequisites and precautions Torquing an inline connector to a stationary connector Torquing multi 44 ple inline connectors The most common cause of measurement errors are bad connections The procedures in this section describe how to make good connections To properly perform assembly and torquing of connectors 1 Ground yourself and all devices Wear a grounded wrist strap and work on a grounded conductive table mat Also see Electrostatic Discharge on page 41 Inspect connectors See Visual Inspection on page 41 If necessary clean the connectors See Cleaning Connec
32. ector impedance of 50 Q The voltage at the acquisition point rises to 250 mV 80E07 80E08 80E09 and 80E10 User Manual 19 Reference 20 The transition propagates to the open in the DUT and is positively reflected back to the acquisition point causing the voltage at the acquisition point to rise to 500 mV At the acquisition point the time displayed from the first step to the second step is the round trip propagation time from the acquisition point to the open in the DUT and back See Figure 11 Baseline Correction The baseline of a current source based step generator normally shifts its DC level with loading The use of a DC current source to cancel the step source current maintains the baseline level close to 0 V see Figure 8 on page 18 Shape of Reflections The shape of a reflection reveals the nature and magnitude of the load impedance mismatch or fault even when the load impedance is not a short 50 Q or open Figure 12 shows typical TDR displays and the load that generated the reflection 80E07 80E08 SOE09 and 80E10 User Manual Reference Line terminated in Z 2Z E 1 E Ei V Line terminated in characteristic Zo Z Zo E 0 25 2 5 Ej V E Line terminated in Z Zo 2 E 3 E Short circuit termination Z 0 E Ej Figure 12 TDR displays for typical loads 80E07 80E08 80E09 and 80E10 User Manual Oo V VE Line
33. electing Waveform M1 On and then selecting Define C1 C2 Math Waveform On and OK Take your measurement For more information see Take automatic measurements on page 26 or Take cursor measurements on page 27 Control elements amp resources Incident TDR steps Front edge of reflections Define Math Math Waveform Math Expression wt mj Gn fer Sources See sr Functions Intaf Diff Vaal Filter Expl Log Sqit Lt Min Mas Avgl pud a m w E en 80E07 80E08 80E09 and 80E10 User Manual Reference Overview Enable differential TDR measurements Differential TDR Take a measurement To take a common mode or differential TDR measurement cont Control elements amp resources 17 da the SETUP DIALOGS button and select the TDR ab 18 Click the TDR STEP Polarity box for one channel to TDR tab invert the polarity of one of the step generators ZETAN Note Although you have inverted a TDR step the step Wim Databas Hist Cursor Meas is only displayed inverted when the acquisition units are Wert HezN Acq Trig Volts Phase Ret Mask Disp Preset TDR Step ACO OnPolanty On Units LO EF E Dit Step EI M ie HA E PB polarity Excmi IE N e 19 Press the SETUP DIALOGS button 20 One channel is asserting a positive step and the other channel is asserting a negative TDR step These conditions set up differential TDR 21 Wh
34. ely The symbol shown to the left indicates that this product complies with the European Union s requirements according to Directive 2002 96 EC on waste electrical and electronic equipment WEEE For information about recycling options check the Support Service section of the E Tektronix Web site www tektronix com This product has been classified as Monitoring and Control equipment and is outside the scope of the 2002 95 EC RoHS Directive This product is known to contain lead cadmium and hexavalent chromium 80E07 80E08 80E09 and 80E10 User Manual vii Environmental Considerations viii 80E07 80E08 80E09 and 80E10 User Manual Preface Manual Structure This is the user manual for the S0EO07 80E08 80E09 and 80E10 remote sampling modules It covers the following information m Description of the capabilities of the sampling modules and how to install them m Explanation of how to operate the sampling modules how to control acquisition processing and input output of information m Listofthe specifications of the sampling modules You may want to visit the Tektronix Website at http www tektronix com for the latest revision of the user documentation Select the Manuals link then enter the part number or product name to locate the document A printed version of this manual is also orderable see Optional Accessories on page 4 NOTE Using the 80E07 80E08 80E09 or S0E10 modules in a main instrument
35. en the TDR steps on the two channels are opposite qm one positive and one negative you can define a math Math Waveform Math Expression waveform that represents the difference signal by nmi s pressing the VERTICAL MENU button selecting the IIS RETE Vert tab selecting Waveform M1 On and then EITHER Ee Nein EE HH selecting Define C1 C2 Math Waveform On and uem eal cel asl aaae OK Set the scale to p If using volts subtract the aran EE waveforms 22 Take your measurement For more information see Take automatic measurements on page 26 or Take cursor measurements on page 27 80E07 80E08 80E09 and 80E10 User Manual 37 Reference Overview 38 TDT measurements Take a 25 Take your measurement For more information see Take measurement To take a common mode or differential TDR measurement cont 23 You can make forward and reverse Time Domain Transmission TDT measurements using the 80E08 or 80E10 To perform a TDT measurement connect one sampling module channel to the input of the device under test and the other sampling module channel to the output of the device under test 24 Then alternately enable the step generators on one channel while sampling the transmitted signal on the other channel to perform forward and reverse TDT measurements You measure the step transmitted through the device rather than reflections from the device as in TDR Note If
36. erie vec neet ea IR d e SDN oe E ac RI E 49 Glossary 24v i RERNDERERRE ERE ERES AN ERES S SS 55 Index i15 epocha EURI ERE rR C Oe e ac re 57 80E07 80E08 80E09 and 80E10 User Manual i Table of Contents List of Figures Figure 1 Sampling main module and remote module S0ETO SHOWA rece rS nn wea tera e ete cen ce Vni ne 2 Figure 2 Sampling module block diagram Lee 3 Figure 3 Sampling module compartments eee 6 Figure 4 Guide rails iii ices ae rere hk 7 Figure 5 Sampling module 80E10 shown 12 Figure 6 Vertical Setup dialog box cece eens 14 Figure 7 TDR Setup dialog box eere 15 Figure 8 Simplified schematic diagram of step generator positive polarity ssssssssessssesoesesoee 18 Figure 9 Step generator with a shorted output 19 Figure 10 Step generation with a 50 Q load 19 Figure 11 Step generation with an open circuit 4 19 Figure 12 TDR displays for typical loads 21 Figure 13 Microstrip discontinuities leere 28 Figure 14 TDR waveform of microstrip in Figure 13 29 Figure 15 TDR step and reflection short Lee 30 Figure 16 TDR step and reflection 50 O line terminated I 7543 ec ev v e V aN RES Ux OPER ECRONVE CORE SEES RON 32 Figure 17 TDR step of undamaged sampling module 46 Figure 18 F
37. ese Cable to remote te d module amp IR J v Y Left channel Right channel SELECT channel button Figure 1 Sampling main module and remote module 80E10 shown AN 502 2V Max V 1 85mm 2 4mm compatible 80E10 TDR Sampling Module Select Q err ew IE Select AT ON OFF PM L TDR on indicator 80E08 80E10 Channel indicator light 80E07 80E08 80E09 and 80E10 User Manual Getting Started The sampling modules provide the features shown in Table 1 Table 1 Sampling module features Feature Number of independent channels Number of TDR channels Bandwidth Selectable bandwidths Vertical sensitivity full scale Signal connectors hs 80E08 i 80E10 30 GHz 30 GHz 60 GHz 50 GHz 20 GHz 30 GHz 20 GHz 30 GHz 40 GHz 30 GHz 40 GHz 30 GHz 60 GHz 50 GHz 1 mV per div min 1 mV per div min 1 mV per div min 1 mV per div min 100 mV per div max 100 mV per div max 100 mV per div max 100 mV per div max 2 92 mm K female 2 92 mm K female 1 85 mm V female 1 85 mm V female 1 Refer to the specification section for complete details on risetime bandwidth and noise The 80E07 80E08 80E09 and 80E10 remote sampling modules have two independent channels each with its own acquisition circuitry The strobe drive signal from the instrument controls the timing of the strobe assertion to each acquisiti
38. ess TDR Preset for the appropriate channel TDR Preset sets the Trigger Source to Internal Clock in the Trigger menu turns on the TDR Step in the TDR Setups menu turns on the channel and selects the acquisition Units in the TDR Setups menu and sets the horizontal scale position and reference The sampling module turns on a red light on the remote module indicating that TDR is activated for that channel You can use TDR on each channel indepen dently 7 Press TDR Autoset Properties to display the Autoset Properties dialog box to prepare the TDR autoset A TDR autoset automatically changes the instrument settings such that the reflected edge is displayed on screen 80E07 80E08 80E09 and 80E10 User Manual Control elements amp resources DEFAULT SETUP SETUP DIALOGS Wfm Database N Hist Cursor Meas l Vert Hoz Acg Trig Phase Ref Mask CIDA Disp Enable Preset TDR Step ACQ TDR On Polarity On Units up 4m Diff y TDR EAS E E P preset A Set units TDR Autoset Hel Properties Zn 23 Reference Overview 24 Set other TDR parameters Changing TDR graticule units To take a TDR measurement cont 9 10 11 Adjust the VERTICAL SCALE 500 mp div in this example and HORIZONTAL SCALE 2 ns div in this example to show a trace similar to that shown Leave at least one division of baseline trace to the left of the first rise The first ris
39. f as distance when using a TDR The longer the step width the greater the range of the TDR At 200 kHz the step on time is 2 5 us enough to see in air one way transit 375 meters about 1 250 feet To see events at greater distances set the Internal Clock of the TDR to a lower frequency 80E07 80E08 SOE09 and 80E10 User Manual Reference Finding the Velocity of The time between the incident edge and the reflected edge is valuable in Propagation and Locating determining the length of the transmission line from the TDR to a mismatch or Mismatches between two mismatches The formula is T 2 H vT D v X EE where p distance to the fault v velocity of propagation T the time from the TDR to the mismatch and back again as measured on the instrument Velocity of Propagation vo is a measure of how fast a signal travels in that transmission line NOTE The factor of 2 in the denominator is present because TDR systems display round trip time incident and reflected edges whereas with distance it is usually desirable to display one way distance It is important to note that the distance scale does not inject this factor of two and therefore the distance displayed is round trip See the main instrument user documentaion and online help for more information about distance scale operation TDR Measurement Units All TDR impedance measurements are based on the ratio of transmitted voltage to reflected voltage
40. g a connection with a damaged or dirty connector can damage connectors beyond repair In some cases magnification is necessary to see damage to a connector However defects visible only under magnification are not the only thing to look for Use the following guidelines when checking connectors m Examine connectors first for obvious damage and defects such as worn plating on the interface broken bent or misaligned center conductors and deformed threads 80E07 80E08 80E09 and 80E10 User Manual 41 Reference m Reduce connector wear by keeping connectors clean and by connecting them properly m Replace calibration devices with worn connectors and use an adapter on the input connector when applicable to minimize wear m Inspect connector mating plane surfaces for dents scratches and for dirt and particles Check for damage due to uneven or excessive misalignment or wear m Carefully inspect the contact fingers in the female center conductor when using slotted connectors Damage which is not always easy to see can result in poor electrical contact When mating precision to nonprecision devices this is especially important Cleaning Connectors Clean connectors are essential for ensuring the integrity of RF and coaxial Overview Cleaning precautions 42 connections This section covers precautions cleaning connector threads cleaning the mating plane surfaces and inspecting the connector To follow proper cleanin
41. g procedures Control elements amp resources 1 Ground the hose nozzle to prevent ESD See Electrostatic Discharge on page 41 2 Air or nitrogen source should have an effective oil vapor wrist strap filter and liquid condensation trap just before the outlet hose 3 Always use protective eyewear when using compressed air or nitrogen 4 Set the pressure to less than 414 kPa 60 psi to control the velocity of the air stream Compressed air can cause ESD when directed into a connector 5 Keep isopropyl alcohol away from heat sparks and flame Store properly and in case of fire use alcohol foam dry chemical or carbon dioxide since water may not work 6 Use isopropyl alcohol with adequate ventilation and avoid contact with eyes skin and clothing Wash thoroughly after handling 7 Incase of a spill soak up with sand or earth and flush spill area 8 Dispose of isopropyl alcohol in accordance with the applicable federal state and local regulations 80E07 80E08 SOE09 and 80E10 User Manual Reference Overview Cleaning the connector threads Cleaning the mating plane surfaces Inspecting the connector To follow proper cleaning procedures cont Control elements amp resources Use compressed air or nitrogen to loosen particles on the connector mating plane surfaces See the preceding Precautions To remove dirt or stubborn contaminants on a connector that cannot be cl
42. hat could result in injury or loss of life damage to this product or other property CAUTION Caution statements identify conditions or practices that could result in Symbols and Terms These terms may appear on the product on the Product KW DANGER indicates an injury hazard immediately accessible as you read the marking m WARNING indicates an injury hazard not immediately accessible as you read the marking m CAUTION indicates a hazard to property including the product The following symbol s may appear on the product KR A CAUTION WARNING Protective Ground Refer to Manual High Voltage Earth Terminal vi 80E07 80E08 80E09 and 80E10 User Manual ISRTITESESSSSUTUVAASEESUPETIUPEU A Environmental Considerations Restriction of Hazardous Substances This section provides information about the environmental impact of the product 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 appropriat
43. hows a typical waveform signature indicating EOS damage Since EOS can be cumulative EOS damage can accumulate until there is even greater damage as shown in Figure 19 on page 48 In this example the percent age of overshoot is increased To check for damage use one of the following procedures If checking an 80E08 or 80E10 sampling module and your instrument has TDR capability attach a 50 2 termination to the channel input and perform a TDR measurement of the attached fitting 1 Select the TDR channel to turn it on 2 Press the TDR preset 3 Adjust the HORIZONTAL SCALE to 2 us per division The vertical setting should be 200 mo as shown in the illustrations This should display the entire TDR step from edge to edge Display the step top at 40 mo per division and check for flatness The top of the waveform should be flat If checking a non TDR sampling module use a similar procedure as just described but use an external step source 80E07 80E08 80E09 and 80E10 User Manual 47 Reference 1 995 p lt EOS signature P 200 mp Idiv trig d a T 2 005 p 261 7 ns 2 us div 20 26 us div Figure 18 First example of EOS error 1 995 p S signature 2 005 p 261 7 ns 2 us div 20 26 us div Figure 19 Second example of EOS error showing cumulative effect 48 80E07 80E08 S
44. ion is the round trip propagation time from the acquisition point to the short in the device under test and back See Figure 9 80E07 80E08 80E09 and 80E10 User Manual Reference OV Figure 9 Step generator with a shorted output Operation Into a 50 Load Initially the diode switch is conducting 10 mA Since the step generator output is connected to a 50 Q load the resistance to ground at the acquisition point is 25 Q because of the internal 50 2 impedance 4250mV 0v Figure 10 Step generation with a 50 O load When the diode switch opens reverse biased apparent resistance to ground at the acquisition point and at the channel connector is 25 2 because the internal termination resistance is 50 Q in parallel with the connector impedance of 50 Q The voltage at the acquisition point rises to 250 mV The transition propagates to the 50 Q load and no reflection occurs Operation Into an Open Initially the diode switch is conducting 10 mA Since the step generator output is open the resistance to ground at the acquisition point is 50 Q because of the internal 50 Q impedance 4500 mV 4250mV Ei OV Figure 11 Step generation with an open circuit When the diode switch opens reverse biased apparent resistance to ground at the acquisition point and at the channel connector is 25 Q because the internal termination resistance is 50 Q in parallel with the conn
45. irect trigger operation Table 8 Electrical sampling modules Mechanical Specifications Construction material Weight unpackaged 80E07 80E08 80E09 80E10 Overall dimensions Main module Remote module Remote cable length Characteristics Main and remote chassis parts constructed of aluminum alloy front panels constructed of plastic laminate circuit boards constructed of glass laminate Cabinet sleeves and end covers are aluminum 861 gm 29 11 oz 868 gm 29 35 oz including two 2 4 mm to 2 92 mm adapters Does not include connectors connector savers connector covers push buttons cables strain reliefs or lock down hardware protruding from the front or rear panels Height 25 mm 1 0 in Width 79 mm 3 1 in Depth 135 mm 5 3 in Height 25 mm 1 0 in Width 55 mm 2 2 in Depth 75 mm 3 0 in 2 meters NOTE For System Environmental specifications refer to the Specifications and Performance Verification manual for the main instrument 80E07 80E08 80E09 and 80E10 User Manual 53 Specifications 94 80E07 80E08 SOE09 and 80E10 User Manual a ae Glossary Accuracy The closeness of the indicated value to the true value Analog to Digital Converter A device that converts an analog signal to a digital signal Attenuation A decrease in magnitude of current voltage or power of a signal Attenuator An electronic transducer that reduces the amplitude of a signal Auto
46. irst example of EOS error eese 48 Figure 19 Second example of EOS error showing cumulative effect 20 0 cece ccc ccc cece weer cree eees 48 80E07 80E08 80E09 and 80E10 User Manual Table of Contents List of Tables Table 1 Sampling module features leere 3 Table 2 Standard accessories eee 4 Table 3 Optional accessories eee 4 Table 4 Torque wrench information eee 45 Table 5 Electrical sampling modules Signal acquisition 49 Table 6 Electrical sampling module TDR system 80E08 and 80E10 eee 52 Table 7 Electrical sampling modules Timebase system 53 Table 8 Electrical sampling modules Mechanical 53 80E07 80E08 80E09 and 80E10 User Manual iii Table of Contents iv 80E07 80E08 80E09 and 80E10 User Manual a NENNEN 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 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 other component manuals for warnings and cautions related to operating the system To Avoid Fire or Connect and Disconnect Properly Do not connect or disconnect probes or test Personal Injury lea
47. l the most significant limitation in impedance testing is the probe Close attention to probe geometry and probing techniques can greatly enhance resolution Reference Impedance All TDR measurements are relative they compare an unknown impedance to a known impedance The accuracy of the results depends directly on the accuracy of the reference impedance Any error in the reference impedance translates to error in the measured impedance It is also a good idea to use a reference impedance close to the expected measured impedance because a smaller difference between the reference and unknown impedance reduces uncertainty in the measurement Cable Losses Always use the shortest high quality cable possible to connect to the test fixture The cable that connects the TDR unit to the circuit board not only degrades the system rise time but can cause other aberrations in the system response that add to measurement error Taking Differential and Common Mode TDR Measurements Why Use What s Special What s Excluded This section describes how to use the 80E08 or 80E10 to take differential and common mode time domain reflectometry TDR measurements To take TDR measurements on coupled transmission lines Using common mode and differential TDR you can characterize coupled transmission lines The Tektronix 80E08 or 80E10 sampling modules are true differential sampling modules for more accurate differential TDR measurements This feature o
48. larity selectable current source and a diode switch Initially before the step the diode switch is biased to conduct current to the output When the diode switch opens the step occurs A DC current source assures that the baseline level stays close to zero volts Figure 8 a simplified diagram shows the switch and the current source G 10 mA Acquisition point to main instrument 77 O 50Q 177 CQ toma 4 77 DUT 6 Figure 8 Simplified schematic diagram of step generator positive polarity The following sections and figures 9 11 describe the operation with a short circuit an open circuit and a 50 Q load with a positive step source Operation Into a Short Initially the diode switch is conducting 10 mA Since the step generator output is initially shorted the resistance to ground is 0 Q When the diode switch opens reverse biased apparent resistance to ground at the acquisition point and at the channel connector is 25 2 because the internal termination resistance is 50 in parallel with the connector impedance of 50 Q The voltage at the acquisition point rises to 250 mV the incident amplitude Ej The transition propagates to the short in the Device Under Test DUT and is negatively reflected back to the acquisition point E 250 mV reflected causing the voltage at the acquisition point to drop back to 0 V The time displayed from the first transition to the second transit
49. le as specified by the time base Waveform The visible representation of an input signal or combination of signals 80E07 80E08 80E09 and 80E10 User Manual Index A Accessories 4 list 4 optional 4 standard 4 Accuracy 57 Adjustments 15 Analog to digital converter 57 Assembly and torquing procedure 44 tips 44 Attenuation 57 Attenuator 57 Automatic measurements 26 Autoset 57 Bandwidth 57 Baseline correction 20 C Channel 57 Channel selection 13 Checking for damage 46 Circuitry 3 Cleaning exterior 16 Cleaning connectors precautions 42 procedures 43 Commands main instrument front panel 14 programmer interface 15 Common mode 57 TDR 34 Common mode TDR measurements 18 34 36 Compensation 9 when installing moving sampling modules 9 Connector and adapter care 41 Connectors 12 Controls 12 Cursor measurements 27 D Damaged inputs detecting 46 80E07 80E08 80E09 and 80E10 User Manual dB 57 Decibel 57 Detecting damaged inputs 46 Dialog box 57 Differential mode 57 Differential TDR measurements 18 34 Digital signal 57 E Electrical overstress prevention causes 46 Electrostatic discharge 8 procedures 41 protection against 41 EOS 58 checking for damage 47 example of EOS 48 prevention 47 second example of EOS 48 EOS prevention 46 External attenuation 58 G Getting started 1 Glossary 57 H Horizontal units selecting 25 Impedan
50. ling module in a static free container such as the shipping container Whenever you move the sampling module from one instrument to another use a static free container to transport the sampling module CAUTION To prevent damage from electrostatic discharge install 50 2 To prevent damage to the sampling module discharge to ground any electrostat ic charge that may be present on the center and outer conductors of cables before attaching the cable to the sampling module To prevent damage to the sampling module do not create an ESD antenna by leaving cables attached to the sampling module input with the other end of the cable open To prevent damage to the sampling module or instrument never install or remove a sampling module when the instrument is on Always use a wrist strap provided with your instrument when handling sampling modules or making signal connections Wear anti static clothing and work in a static free workstation when using sampling modules Use a Tektronix 80402 EOS ESD Protection Module if doing TDR work To prevent damage to the sampling module or instrument do not apply a voltage greater than the Maximum Input Voltage see page 49 for your sampling module Static Controlled For information on creating a static controlled workstation consult the Electron Workstation ic Industries Association document EJA 625 Requirements for Handling Electrostatic Discharge Sensitive ESDS Devices You can use
51. main instrument may not boot properly if an 80E07 80E08 80E09 or 80E10 module is installed into a main instrument that is using product software version 2 4 or earlier To display the version installed select About from the Help menu of the main instrument CAUTION To prevent electrostatic damage to the instrument and sampling modules follow the precautions described in this manual and the manuals accompanying your instrument See Electrostatic Discharge on page 8 80E07 80E08 80E09 and 80E10 User Manual 1 Getting Started Product Description The electrical sampling modules are high bandwidth sampling acquisition modules or sampling TDR modules suitable for use in a variety of test and measurement applications and systems Key features include m Two channels of mid to high bandwidth sampling acquisition m Remote channel modules are attached to the main unit through cables allowing placement of the sampler or sampler TDR closer to the unit under test m User selectable bandwidth m Independent channel delay m Differential and common mode TDR with independently controllable polarity and step deskew on each channel 80E08 and 80E10 modules only m Fast TDR step speeds 80E08 and 80E10 modules only Channel indicator SELECT channel button light TekProbe connector TDR on indicator P light PROBE POWER PROBE POWER e008 80E10 SAMPLING 65 loOo MARNE Hold down screw
52. monstrates the common mode and differential TDR features of the 80E08 or 80E10 sampling modules Control elements amp resources wrist strap See the main instrument online help for scaling and acquisition setup 80E07 80E08 SOE09 and 80E10 User Manual Reference Overview Preset TDR To take a common mode or differential TDR measurement cont Control elements amp resources 4 Initialize the instrument press DEFAULT SETUP 5 Press the SETUP DIALOGS button and select the TDR tab 6 Press TDR Preset for both channels for the sampling TDR ta module connected to the cables to turn them on Setups CRS Pressing Preset performs the following Wfm Database Hist Cursor Meas m Turns on the channel Vet Hoz W Acq Trig m Tums on a step Phase Ref Mask Dip Preset TDR Step ACO OnPolarity On Units m Sets trigger source to Internal Clock m Sets acquisition to Averaging M z Iv PE m Changes display style to Show Vectors The sampling module will turn on the red TDR indicator preset Al lights indicating that TDR is activate for the channels Set Select the polarity desired for both channels Set units polarity Set the units to p Press the SETUP DIALOGS button to dismiss the A dialog box GR 80E07 80E08 80E09 and 80E10 User Manual 35 Reference To take a common mode or differential TDR Overview Set Other TDR parameters 11 12 13
53. nly works with an 80E08 or 80E10 sampling module 80E07 80E08 80E09 and 80E10 User Manual 33 Reference Keys to Using To Take a Common Mode or Differential TDR Measurement To take a common mode or differential TDR Overview measurement 34 Prerequisites 1 Connect your wrist strap to the antistatic connector on the front of your instrument 2 An 80E08 or 80E10 sampling module must be installed in the main instrument The acquisition system should be set to Run Input 3 Connect transmission lines to the sampling module using proper probing connecting techniques for your application for example two SMA cables preferably of matched length Connect the device under test to the transmission lines Connect the conductors of a differential line to the center conductors Connect the shields together Read the following topics they provide details that can help set up to take effective differential and common mode TDR measurements The 80E08 or 80E10 TDR sampling modules are able to perform differential and common mode TDR measurements As described earlier the sampling module has two input channels and two independent step generators The step generator output for each channel is selectable for positive or negative polarity and amplitude This section will show you how to use the two channels and step generators of the 80E08 or 80E10 to perform differential and common mode TDR measurements This example de
54. nt 17 Usethe Vertical buttons to select the TDR waveform to be 18 19 20 21 22 measured Select one of the measurement tool bars Click the measurement you want such as mean in the measurement tool bar Read the results in the measurements readout To take your measurement over a portion of the waveform select the region tab to display the gate controls Click the check box as indicated at the right to turn gating on and to display the gates on screen Use the G1 Gate1 and G2 spin controls or click and type in values use the keypad or multipurpose knobs or touch and drag the gate to adjust the gates on screen such that the area to measure is between the gates If necessary to provide a good view of this portion of the waveform adjust the Vertical SCALE and POSITION and the Horizontal SCALE POSITION and Reference To see the difference scale and position can make in your waveform display compare the waveforms in Figure 16 and also compare the waveforms in Figures 13 and 14 Control elements amp resources jw Measurement tool bar selection Pa IEEE TI ng a m Measurement readout Measurement s Access to virtual keyboard SourceN Source2 Set to Defaut Source Aion HiLow RefLevel Vary to position gates Check to display gates Gate G1 Gate G2 A f i he ad WR Benen sates E Ue D
55. nting hole one on rear and one on front panel Ball plunger to engage the larger rail on the bottom cover Slide the remote module onto the guide rail Secure the guide rail to a fixture or solid surface Fixture or desktop Figure 4 Guide rail and mounting holes Electrostatic Discharge To prevent electrostatic damage to your mainframe and sampling modules follow the precautions described in this manual Circuitry in the sampling module is very susceptible to damage from electrostat ic discharge or from overdrive signals Be sure to only operate the sampling module in a static controlled environment Be sure to discharge to ground any electrostatic charge that may be present on the center and outer connectors of cables before attaching the cable to the sampling module Know your signal source If it is capable of delivering overvoltages it is safer to not depend on the signal source settings for protection but instead use an external attenuator that protects the input from the worst case conditions For example for a 20 V maximum source connected to a 3 V maximum sampling module use a 10X attenuator Where possible connect your cables to the signal source first and to the sampling module second 80E07 80E08 80E09 and 80E10 User Manual Getting Started terminations on the sampling module connectors before removing the sampling modules from an instrument or when it is not in use Store the samp
56. o 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 service the product b to repair damage resulting from improper use or connection to incompatible equipment c 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 T
57. odule 46 TDR measurements 17 TEKPROBE connector 13 Time domain reflectometer 58 Torque wrench information 45 Trigger 58 U Usage 11 V Visual inspection 41 W Waveform 58 80E07 80E08 80E09 and 80E10 User Manual
58. on system This guarantees sampling coincidence between the two channels of a sampling module S 4 77 50 Sampler 4 77 gt To main instrument Strobe Strobe drive Generator From main instrument Sampler gt To main instrument o 4 77 50 Q Figure 2 Sampling module block diagram 80E07 80E08 80E09 and 80E10 User Manual 3 Getting Started Accessories and Options Standard Accessories Optional Accessories This section lists the standard and optional accessories available for the sampling modules as well as the product options The accessories in Table 2 are shipped with the module Visit the Tektronix web site or a current Tektronix catalog for additions changes and details Table 2 Standard accessories Item Part number Certificate of Traceable Calibration for product at initial shipment Not Orderable SMA male 50 Q termination with beaded chain 2 one per channel 011 0176 xx Guide rail kit 2 guide rails 4 flathead 4 40 screws 650 4986 xx 2 4 mm 1 85 mm S male to 2 92 mm K female adapters 2 011 0157 xx 80E09 and 80E10 only Transit case with anti static foam 024 0053 xx MaxTek part number Product documentation CD ROM includes cd instructions cable 020 2543 xx markers The accessories in Table 3 are orderable for use with the sampling module at the time this manual was originally published Visit the Tektronix Web site or
59. own Signal Connector 12 The input signal connectors for each channel let you connect signals that you want to sample To acquire a signal connect the signal to the remote sampling module through the Signal Connector input Signal connectors used on your sampling module are described in Table 1 on page 3 Connector Care Never attach a cable to a sampling module connector if the cable has a worn or damaged connector because you may damage the sampling mod ule connector Use extra care when attaching or removing a cable from the connectors Turn only the nut not the cable When attaching a cable to a sampling module connector align the connectors carefully before turning the nut Use light finger pressure to make this initial connection Then tighten the nut lightly with a wrench For more information see Connector and Adapter Care Requirements on page 41 For the specific torque settings see Table 4 on page 45 If the sampling module connectors will receive heavy use such as in a produc tion environment you should install adapters such as a Tektronix part number 015 0549 xx for 3 5 mm connectors on the sampling module to make connec tions to the device under test 80E07 80E08 SOE09 and 80E10 User Manual Operating Basics Channel Selection TekProbe Connector TDR On Indicator System Interaction Each channel has two locations to control the channel The module installed into the instrument has a SELECT ON OFF b
60. ownward deflection indicates a lower impedance event such as a short see Figure 15 or an increase in conductor width see Figure 13 The time location of the high impedance event or low impedance event as well as the delta times is displayed on screen l Open Inductive discontinuity Connector N Capacitive discontinuity Figure 14 TDR waveform of microstrip in Figure 13 80E07 80E08 80E09 and 80E10 User Manual 29 Reference TDR Measurement Range 30 Figure 15 TDR step and reflection short What is the range of your TDR is a common question asked by people looking to purchase a TDR This is a very important question that cannot be answered simply Another important consideration is how close together the TDR can resolve features This section discusses TDR range and the factors affecting it There are a number of factors that can affect the distance over which a TDR can locate features The most important parameters that are TDR related are step amplitude step risetime and step width Step amplitude is the amount of voltage produced by the TDR step It is fixed for the 80E08 and 80E10 at 250 mV In general the higher the amplitude the farther the TDR can see Generally this type of step is optimized for short range TDR Overall step width also affects range It follows the setting of the Internal Clock Rate 25 kHz 200 kHz Step width is measured in time but can also be thought o
61. range maximum input voltage Vertical number of digitized bits 80E07 80E08 80E09 and 80E10 User Manual Characteristics Tekprobe SMA interface is provided through the electrical sampling module interface one per vertical channel Module extenders 015 1568 xx 015 1569 xx 80N01 and 80A03 are not permitted and are mechanically blocked from being used in front of the main module 2 2 92 mm K female SMA compatible connector 1 85 mm V female connector 50 1Q 1 Vpp offset 500 mV 1 1V 2 0 V DC peak AC 14 bits full scale 49 Specifications 50 Table 5 Electrical sampling modules Signal acquisition cont Specifications Vertical sensitivity range Maximum Minimum Vertical offset range Compensation temperature range DC voltage accuracy single point compensated Analog bandwidth maximum frequency setting 80E07 80E08 80E09 80E10 Analog bandwidth reduced frequency set points typical 80E07 80E08 80E09 80E10 Rise time typical 80E07 80E08 80E09 80E10 Characteristics The range of available full scale input settings 1 mV per division 10 mV full screen 100 mV per division 1 V full screen 1 1V 5 C about temperature where compensation was performed If the module is moved to another compartment on the mainframe the channel s must be recompensated The sampling module and mainframe together as a system shall meet or exceed the following
62. rview Joining two stationary connectors with a semi rigid coaxial cable Final connection Position the cable and order the connections to minimize the side and end loading on the last connection If available use a protective connector to prevent or reduce damage to a connector Use a torque wrench to make the final connection See Table 4 on page 45 for torque wrench information Rotate only the connector nut that you are tightening If necessary use an open end wrench to keep the body of the device from turning Position both wrenches within 90 degrees of each other before applying force Refer to the illustration at right Hold the torque wrench lightly at the end of the handle Apply downward force perpendicular to wrench handle this applies torque to connection through the wrench Tighten the connection just to the point that the wrench breaks over Do not overtighten the connection Table 4 Torque wrench Information Connector type SMA 1 85 mm 2 4 mm 2 92 mm 3 5 mm Torque setting 56 N cm 5 in Ib 90 N cm 8 in Ib 80E07 80E08 80E09 and 80E10 User Manual To properly perform assembly and torquing of connectors cont Control elements amp resources 1 Torgue wrench Press until handle yields Connector zo xc l 26 wv A Keep gt wrench stationary Torque tolerance zx 5 6 N cm 0 5 in lb zx 9 0 N cm 0 8 in Ib 45 Reference Detecting
63. set A means of letting the instrument set itself to provide a stable and meaning ful display of a given trace Bandwidth The range of frequencies handled by a device or system Bandwidth is a measure of network capacity Analog bandwidth is measured in cycles per second Digital bandwidth is measured in bits of information per second Channel A place to connect a signal or attach a network or transmission line to sampling modules Common Mode A circumstance where a signal is induced in phase on both sides of a differential network dB Decibel a method of expressing power or voltage ratios The decibel scale is logarithmic The formula for decibels is dB 20 log Vi Vrer where Vi is the voltage of the incident pulse Vref is the voltage reference and log is the decimal based logarithmic function Dialog Box A displayed box in which you enter instrument commands Differential Mode A circumstance where the true signal and its logical compliment are transmitted over a pair of conductors Digital Signal A signal made up of a series of on and off pulses 80E07 80E08 80E09 and 80E10 User Manual 55 Glossary 56 Electrical Overstress EOS Electrical overstress occurs when an electronic device is subjected to an input voltage higher than the designed maximum tolerable level External Attenuation Attenuation that is outside the sampling module Impedance The opposition to an AC signal in the wire Impedance is
64. terminated in a series R L Q 4 Ei V Line terminated in a shunt R C V g Line terminated in a shunt R L Line terminated in a series R C 21 Reference Overview 22 To Take a TDR Measurement Prerequisites 1 Input 3 This example demonstrates the TDR feature of the 80E08 and 80E10 sampling modules TDR is a method of examining and measuring a network or transmis sion line by sending a step signal into the network and monitoring the reflec tions To take a TDR measurement Connect your wrist strap to the antistatic connector on the front of your instrument See Caution on page 9 An 80E08 or 80E10 sampling module must be installed in the main instrument The Acquisition system should be set to Run and the vertical and horizontal controls should be set appropri ately for the signal to be acquired Connect the transmission line to the sampling module using proper probing connecting techniques for your application for example connect an SMA cable of lt 5 ns length Control elements amp resources Connect di On Sey vi wrist strap See the main instrument online help for scaling and acquisition setup 80E07 80E08 SOE09 and 80E10 User Manual Reference Overview To take a TDR measurement cont Preset TDR 4 Initialize the instrument press DEFAULT SETUP 5 Press the SETUP DIALOGS button and select the TDR tab 6 Pr
65. the instrument and sampling modules follow the precautions described in this manual and the manuals accompanying your instrument See Electrostatic Discharge starting on page 8 Always use a wrist strap provided with your instrument when handling sampling modules or making signal connections The input circuitry in your sampling module is very susceptible to damage from overdrive signals and electrostatic discharge Never apply a DC or peak voltage greater than the Maximum Input Voltage see page 49 of your sampling module Only operate the instrument and sampling module in a static controlled environment 80E07 80E08 80E09 and 80E10 User Manual 11 Operating Basics Controls SELECT channel button TDR on indicator Each sampling module contains two identical remote modules This section describes module channel controls connectors and indicators Channel indicator light TekProbe connector T 80E08 80E10 MODULE Hold down screw Cable to remote NN 9 module light m SAMPLING x es POWEP e e PROBE POWER A 502 2V Max V 1 85mm 2 4mm compatible loOo SELECT ON OFF L TDR on indicator 80E08 80E10 SELECT ON OFF 80E10 TDR Sampling Module X Select Q Left channel I Bs Channel indicator 2 light a Y Y Right channel SELECT channel T Figure 5 Sampling module 80E10 sh
66. tors on page 42 Use a connector gage to verify that all center conductors are within the observed pin depth values For multiple connections always put the fixed wrench on the inside stationary half of a connection and apply torque to the outside movable half Always torque a single connection never multiple connections Carefully align connectors Male connector pin must slip concentrically into the contact finger of the female connector Push the connectors straight together and tighten the connector nut finger tight Do not turn the device body There is usually a slight resistance as the center conductors mate Uniform light contact is sufficient for the preliminary connection do not overtighten Ensure that the connectors are properly supported As needed relieve any side pressure on the connection from long or heavy devices or cables If starting from a fully disassembled state order the connections so that they are assembled from the outside moveable portions toward the inward stationary portions Disassemble from the inside outward If starting from a partially disassembled state such as with a protective coupler leave subassemblies intact Maximize protection and minimize disturbance for the connection that is intended to be preserved by the protective coupler 80E07 80E08 SOE09 and 80E10 User Manual Control elements amp resources Connect Or SEB AE wrist strap Reference Ove
67. ument External attenuation enables you to enter a number representing external attenuation you have added to a channel 80E07 80E08 80E09 and 80E10 User Manual 13 Operating Basics Commands From the Main Instrument Front Panel 14 Vertical Setup TDR Setup The Vertical Setup dialog box accesses the sampling module controls This dialog box is shown in Figure 6 You first select the channel in the Waveform section of the dialog box Then you select the Setup Scale Position Channel Offset Deskew Delay Bandwidth Units or External Attenuation boxes to change those settings Detailed information on this dialog box can be found in the online help accessed from the main instrument wfm Database Hist Cursor Meas Phase Ref Mask TOR Disp Vert Horz Acq Trig m Waveform E z Iv On Deine m Setup Scale 100 0 Vidiv B Position fo Odiv aH r Channel Offset 0oy Deskew 0 0s Delay jo 000 EE Bandwidth 50 00GHz m Units auto External Attenuation C dB i o m f Linear DC Cal 0oy spisso Figure 6 Vertical Setup dialog box The TDR Setup dialog box accesses the controls for a TDR capable sampling module This dialog box is shown in Figure 7 The channels with TDR capability are active Use the channel Preset to automatically display the incident step Once a TDR step is active and the channel selected use TDR autoset to automatically find
68. utton and a channel light for each channel This same function and indicator light is available on each remote module The buttons and lights operates as follows m Ifthe yellow channel light is on the channel is acquiring a waveform m Ifyou press the button and the channel is not currently being acquired for any channel or math waveform then the instrument activates turns on the channel m If you press the button and the channel is currently active as a channel waveform then the instrument selects the channel waveform m Ifthe channel waveform is already selected when you press the channel button the instrument turns the channel off A TekProbe connector is provided at the module for accessories requiring TekProbe SMA support at levels 1 and 2 The connector provides power and control to attached accessories by the main instrument On modules with TDR capability a TDR ON light is included on the main module and remote modules to indicate whether the step generator is sending out a step through the signal connector The main instrument turns this on or off Your sampling module is a part of a larger instrument system Most of the sampling module functions such as vertical and horizontal scale are controlled automatically by the main instrument You do not directly control these parameters they are controlled for you as you perform tasks on the main instrument You also control external channel attenuation from the main instr
69. very much like resistance to a DC signal in a DC circuit Impedance is made up of resistance and inductive and capacitive reactance Incident Step The electrical energy transmitted by the TDR step generator An acquired waveform shows this step and all reflections on the signal conductor Initialize Setting the main instrument to a completely known default condition Internal Clock A trigger source generated internally within the instrument and used to synchronize TDR step generators Also available at the front panel Internal Clock Output connector Rho Q When making TDR measurements the ratio of the incident step to the reflected step A value of one 1 indicates complete reflection Setting The state of the front panel and system at a given time TDR Time Domain Reflectometer an instrument that sends out steps of energy and measures the amplitude and time interval of the reflections If the velocity of the energy through the cable is known distances to features can be computed and displayed Conversely the speed that energy travels through a cable of known length can also be computed The way in which the energy is reflected and the amount of the energy reflected indicate the condition of the cable Time Domain Transmission TDT A method of characterizing a transmission line or network by transmitting a signal through the network and monitoring the output Trigger An electrical event that initiates acquisition of a samp

Download Pdf Manuals

Related Search

Related Contents

取扱説明書    取扱説明書 取付・設置説明書    AVセンター※とネットワークを無線でつなぐアダプター    

Copyright © All rights reserved. Failed to retrieve file