Tektronix TDS6804B, TDS6604B, TDS6154C, TDS6124C User manual

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User Manual

TDS6000B & TDS6000C Series Digital Storage Oscilloscopes

071-1658-02

This document applies to firmware version 1.0 and above.

www.tektronix.com

Copyright © Tektronix, Inc. 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.

TekConnect MyScope, and VocalLink are registered trademarks of Tektronix, Inc.

TekVISA, FastFrame, Pinpoint, and MultiView Zoom are trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc. 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA

For product information, sales, service, and technical support:

H In North America, call 1-800-833-9200. H 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 to like new performance. All replaced parts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shal l 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 inc reases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Getting Started

General Safety Summary xiii...................................

Environmental Considerations xv...............................

Preface xvii...................................................

About This Manual xvii...............................................

Related Manuals and Online Documents xviii..............................

Product Description 1--1........................................

Model Key Features 1--1..............................................

Product Software 1--2................................................

Software Upgrade 1--3................................................

Installation 1--5...............................................

Unpacking 1--5......................................................

Checking the Environment Requirements 1--6.............................

Connecting Peripherals 1--6............................................

Powering On the Instrument 1--8........................................

Shutting Down the Instrument 1--9......................................

Backing Up User Files 1--9............................................

Installing Software 1--10...............................................

Removing the Removable Hard Drive 1--13................................

Reinstalling the Removable Hard Drive 1--14..............................

Enabling or Disabling Your LAN and Connecting to a Network 1--15...........

Setting up a Dual Display 1--16..........................................

Incoming Inspection 1--21.......................................

Self Tests 1--21.......................................................

Functional Tests 1--22.................................................

Check Vertical Operation 1--23......................................

Check Horizontal Operation 1--25....................................

Check Trigger Operation 1--27.......................................

Perform the Extended Diagnostics 1--29...................................

Operating Basics

Operational Maps 2--1.........................................

Documentation Map 2--2.......................................

System Overview Maps 2--3.....................................

Functional Model Map 2--3............................................

Process Overview Map 2--5............................................

User Interface Map -- Complete Control and Display 2--6............

Front-Panel Map -- Quick Access to Most Often Used Features 2--7....

Display Map -- Single Graticule 2--8..............................

Front Panel I/O Map 2--9.......................................

Rear Panel I/O Map 2--10.......................................

TDS6000B & TDS6000C Series User Manual

Table of Contents

Reference

Acquiring Waveforms 3--1......................................

Signal Connection and Conditioning 3--2.................................

Connecting and Conditioning Your Signals 3--3........................

To Set Up Signal Input 3--6........................................

To Autoset the Instrument 3--9......................................

To Reset the Instrument 3--10........................................

To Get More Help 3--10............................................

Input Conditioning Background 3--11.................................

Setting Acquisition Controls 3--17.......................................

Using the Acquisition Controls 3--18..................................

To Set Acquisition Modes 3--24......................................

To Start and Stop Acquisition 3--26...................................

To Set Roll Mode 3--27............................................

Acquisition Control Background 3--28....................................

Acquisition Hardware 3--28.........................................

Sampling Process 3--29.............................................

Acquisition Modes 3--29............................................

Waveform Record 3--30............................................

Real-Time Sampling 3--31..........................................

Equivalent-Time Sampling 3--31.....................................

Interpolation 3--32................................................

To Set Display Format 3--33.........................................

Using FastFrame 3--35.................................................

Using FastFrame Acquisitions 3--36..................................

To Set FastFrame Mode 3--37.......................................

Time Stamping Frames 3 --39........................................

Triggering 3--43................................................

The Pinpoint Trigger System 3--43.......................................

Triggering Concepts 3--44..............................................

The Trigger Event 3--44............................................

Trigger Sources 3--45..............................................

Trigger Types 3--45................................................

Trigger Modes 3--46...............................................

Trigger Holdoff 3--46..............................................

Trigger Coupling 3--47.............................................

Horizontal Position 3--48...........................................

Slope and Level 3--48..............................................

Delayed Trigger System 3--49.......................................

Triggering from the Front Panel 3--49.....................................

Access Procedures 3--49............................................

To Check Trigger Status 3--53.......................................

Additional Trigger Parameters 3--54......................................

Advanced Triggering 3--59.............................................

TDS6000B & TDS6000C Series User Manual

Table of Contents

To Trigger on a Glitch 3-- 65.........................................

To Trigger on a Runt Pulse 3--67.....................................

Trigger Based on Pulse Width 3--69...................................

To Trigger Based on Transition Time 3--71.............................

Triggering on a Window 3--74......................................

Trigger Based on Pulse Timeout 3--76.................................

Trigger on a Pattern 3--77...........................................

To Trigger on a State 3--80..........................................

To Trigger on Setup/Hold Time Violations 3--81.........................

Logic Qualify a Trigger 3--84........................................

Sequential Triggering 3--85.............................................

Using Sequential Triggering 3--86....................................

To Trigger on a Sequence 3--91......................................

Comm Triggering 3--95................................................

Serial Pattern Triggering 3--95..........................................

Displaying Waveforms 3--97......................................

Using the Waveform Display 3--98.......................................

Using the Display 3--99............................................

To Display Waveforms in the Main Graticule 3--103......................

Setting MultiView Zoom Controls 3--105...................................

Using with Waveforms 3--105........................................

To Zoom Waveforms 3--105..........................................

Customizing the Display 3--110..........................................

Using Display Controls 3--110........................................

Set Display Styles 3--114............................................

Customize Graticule and Waveforms 3--116.............................

Measuring Waveforms 3--119.....................................

Taking Automatic Measurements 3--119....................................

Using Automatic Measurements 3--121.................................

To Take Automatic Measurements 3-- 123...............................

To Localize a Measurement 3-- 128....................................

Taking Cursor Measurements 3--130.......................................

Using Cursors 3--131...............................................

To Set the Cursor Sources 3--134......................................

Taking Histograms 3--136...............................................

Using Histograms 3--137............................................

To Start and Reset Histogram Counting 3--137...........................

HistogramMeasurements 3--139.......................................

Optimizing Measurement Accuracy 3--139..................................

To Compensate the Instrument 3--139..................................

To Connect the Probe Calibration Fixture 3--141.........................

To Calibrate Probes 3--141...........................................

To Deskew Channels 3--141..........................................

To Compensate Passive Probes 3--142..................................

Serial Mask Testing 3--144..............................................

Creating and Using Math Waveforms 3--145.........................

Defining Math Waveforms 3--146.........................................

Using Math 3--147.................................................

To Define a Math Waveform 3--153....................................

Operations on Math Waveforms 3--156.....................................

TDS6000B & TDS6000C Series User Manual

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Table of Contents

Using Math Waveforms 3--156........................................

To Use Math Waveforms 3--157.......................................

Defining Spectral Math Waveforms 3--160..................................

Using Spectral Math Controls 3--161...................................

Recognizing Aliasing 3--182.........................................

To Select a Predefined Spectral Math Waveform 3--184....................

To Define a Spectral Math Waveform 3--185............................

Spectral Math Example 3--193........................................

Data Input/Output 3--199.........................................

Saving and Recalling a Setup 3--199.......................................

Using Auto-IncrementFile Name 3--200................................

To Save Your Setup 3--201...........................................

To Recall Your Setup 3--204..........................................

Saving and Recalling Waveforms 3--205...................................

To Save Your Waveform 3--206.......................................

To Recall Your Waveform 3--209......................................

To Clear References 3-- 211..........................................

Exporting and Copying Waveforms 3--213..................................

To Export Your Waveform 3--215.....................................

To Use an Exported Waveform 3--222..................................

To Copy Your Waveform 3--224......................................

Printing Waveforms 3--228..............................................

To Print from Front Panel 3--228......................................

To Print from Menu Bar 3--228.......................................

To Set Up the Page 3--229...........................................

To Preview the Page 3--230..........................................

To Print Using Print Screen 3--231.....................................

To Date/Time Stamp Hardcopies 3--232................................

Remote Communication 3--233...........................................

MyScope 3--235.................................................

Using MyScope Control Windows 3--238...................................

Appendices

Appendix A: Automatic Measurements Supported A--1..............

Levels Used in Taking Amplitude, Timing, and Area Measurements A--5........

Levels Used in Taking Eye Measurements

(Optional on TDS6000B & TDS6000C Series) A--6.....................

P Values A--7....................................................

T1 Values A-- 8...................................................

T2 Values A-- 8...................................................

DCD Values A--8.................................................

Measurements Annotations A--9........................................

Appendix B: Menu Bar Commands B-- 1..........................

File Commands B--1..................................................

Edit Commands B--3.................................................

Vertical Commands B--4..............................................

Horizontal and Acquisition Commands B--5...............................

Trigger Commands B--7...............................................

Display Commands B-- 9...............................................

Cursors Commands B--11...............................................

Measure Commands B--11..............................................

TDS6000B & TDS6000C Series User Manual

Table of Contents

Masks Commands B--13................................................

Math Commands B--14.................................................

Application Commands B--14...........................................

Utilities Commands B --15..............................................

Help Commands B --16.................................................

Buttons B--16........................................................

Appendix C: Serial Mask Testing and Serial Triggering C--1.........

Product Description C--1..............................................

Installing Optional Serial Mask Testing and Serial Pattern Trigger Functions C--3.

Serial Mask Testing Functions C--4......................................

Accessing Serial Pattern Trigger Functions C--7............................

Mask Testing C--8....................................................

Communication (Comm) Triggering C--28.................................

Serial Pattern Trigger C--32.............................................

Supported Mask Types and Standards C--34................................

Supported Communication Trigger Codes and Standards C--38.................

Automatic Communication Signal Measurements C--41......................

Levels Used in Taking Eye Measurements C--42............................

Supported Mask Types and Standards C--45................................

Supported Communication Trigger Codes and Standards C--49.................

Automatic Communication Signal Measurements C--51......................

Levels Used in Taking Eye Measurements C--52............................

Appendix D: Cleaning D--1......................................

Exterior Cleaning D--1................................................

Flat Panel Display Cleaning D-- 2........................................

Glossary Index

TDS6000B & TDS6000C Series User Manual

Table of Contents

List of Figures

Figure 1--1: Locations of peripheral connectors on rear panel 1--7.....

Figure 1--2: Powering on the instrument 1--9.......................

Figure 1--3: Removing the hard drive 1--13.........................

Figure 1--4: Reinstalling the hard drive 1--14........................

Figure 1--5: Enabling your LAN and connecting to a network 1--15.....

Figure 1--6: Setting up a dual display 1 --17.........................

Figure 1--7: Drag area for Windows task bar 1--18...................

Figure 1--8: Moving Windows desktop icons to the external monitor 1--19

Figure 1--9: Universal test hookup for functional tests -- CH 1 shown 1--23

Figure 1--10: Channel button location 1--24.........................

Figure 1--11: Setup for time base test 1--26..........................

Figure 1--12: Setup for trigger test 1--28............................

Figure 3--1: Input and Acquisition Systems and Controls 3--2.........

Figure 3--2: Setting vertical range and position of input channels 3--13..

Figure 3--3: Varying offset moves the vertical acquisition window

on the waveform 3--14.......................................

Figure 3--4: Horizontal Acquisition window definition 3--15...........

Figure 3--5: Common trigger, record length, and acquisition rate

for all channels 3--17........................................

Figure 3--6: Roll mode 3 --22......................................

Figure 3--7: Aliasing 3--23........................................

Figure 3--8: Digitizer configuration 3--29...........................

Figure 3--9: Digital acquisition — sampling and digitizing 3--29........

Figure 3--10: The waveform record and its defining parameters 3--30...

Figure 3--11: Real-time sampling 3--31.............................

Figure 3--12: Equivalent-time sampling 3--32.......................

Figure 3--13: Acquisition XY display 3--34..........................

Figure 3--14: FastFrame 3--35....................................

Figure 3--15: FastFrame time stamp 3--41..........................

Figure 3--16: Triggered versus untriggered displays 3--44.............

Figure 3--17: Triggered versus untriggered displays 3--46.............

Figure 3--18: Holdoff adjustment can prevent false triggers 3--47.......

Figure 3--19: Slope and level controls help define the trigger 3--48......

TDS6000B & TDS6000C Series User Manual

Table of Contents

Figure 3--20: Example advanced trigger readout 3--60................

Figure 3--21: Violation zones for Setup/Hold triggering 3--64..........

Figure 3--22: Triggering on a Setup/Hold time violation 3--84..........

Figure 3--23: Triggering with Horizontal Delay off 3--87..............

Figure 3--24: Triggering with Horizontal Delay on 3--88..............

Figure 3--25: Reset trigger limitation 3--89..........................

Figure 3--26: Trigger and Horizontal Delay summary 3--90............

Figure 3--27: Display elements 3--98...............................

Figure 3--28: Horizontal Position includes time to Horizontal

Reference 3--102.............................................

Figure 3--29: Graticule, Cursor, and Automatic measurements 3--119....

Figure 3--30: Annotated display 3--120..............................

Figure 3--31: High/Low tracking methods 3--122......................

Figure 3--32: Reference-level calculation methods 3-- 123...............

Figure 3--33: Horizontal cursors measure amplitudes 3--131............

Figure 3--34: Components determining Time cursor readout values 3--132

Figure 3--35: Horizontal histogram view and measurement data 3--136...

Figure 3--36: Probe calibration and deskew fixture 3--141..............

Figure 3--37: Pass/Fail mask testing 3--144...........................

Figure 3--38: Spectral analysis of an impulse 3--145...................

Figure 3--39: Functional transformation of an acquired waveform 3--146.

Figure 3--40: Derivative math waveform 3--150.......................

Figure 3--41: Peak-peak amplitude measurement of a derivative

waveform 3--151.............................................

Figure 3--42: Duration and resolution control effects 3--162.............

Figure 3--43: Definition of gate parameters 3--163.....................

Figure 3--44: Effects of frequency domain control adjustments 3--165....

Figure 3--45: Effects of adjusting the reference level 3--167.............

Figure 3--46: Effects of adjusting the reference level offset control 3--167.

Figure 3--47: Example of the effects of setting the phase

suppression threshold 3--169...................................

Figure 3--48: Windowing the time domain record 3--171...............

Figure 3--49: Example of scallop loss for a Hanning window

without zero fill 3--173........................................

Figure 3--50: Time and frequency graphs for the Gaussian window 3--174

Figure 3--51: Time and frequency domain graphs for the

Rectangular window 3--175....................................

Figure 3--52: Time and frequency graphs of the Hamming window 3 --176

Figure 3--53: Time and frequency graphs for the Hanning window 3--177.

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Table of Contents

Figure 3--54: Time and frequency graphs for the Kaiser-Bessel

window 3--178...............................................

Figure 3--55: Time and frequency graphs of the Blackman-Harris

window 3--179...............................................

Figure 3--56: Time and frequency domain graphs for the Flattop2

window 3--180...............................................

Figure 3--57: Tek Exponential window in the time and the

frequency domains 3--181.....................................

Figure 3--58: How aliased frequencies appear in a spectral waveform 3--183

Figure 3--59: Auto-increment file name feature 3--201.................

Figure 3--60: Print window 3--228..................................

Figure 3--61: Hardcopy formats 3--229..............................

Figure 3--62: Page setup window 3--230.............................

Figure 3--63: Print preview window 3--231...........................

Figure A--1: Levels used to determine measurements A--5............

Figure A--2: Eye-diagram values A--7.............................

Figure C--1: Masks control window C--4...........................

Figure C--2: Communication signal trigger functions C--5............

Figure C--3: Communication measurement functions C--6............

Figure C--4: Serial pattern trigger control window C--7..............

Figure C--5: Eye-diagram and optical values C--42...................

Figure C--6: Eye-diagram and optical values C--52...................

viii

TDS6000B & TDS6000C Series User Manual

List of Tables

Table of Contents

Table 1--1: Additional accessory connection information 1--8.........

Table 1--2: Vertical settings 1--24.................................

Table 3--1: Additional resolution bits 3--19.........................

Table 3--2: Pattern and state logic 3--62............................

Table 3--3: Defining and displaying waveforms 3--100.................

Table 3--4: Operations performed based on the waveform type 3--101...

Table 3--5: Customizable display elements 3--111.....................

Table 3--6: Cursor functions (types) 3--130..........................

Table 3--7: Cursor units 3--133....................................

Table 3--8: Math expressions and the math waveforms produced 3--148..

T able 3--9: Spectral analyzer controls 3--161.........................

Table 3 --10: Window characteristics 3 --172..........................

Table A --1: Supported measurements and their definition A--1........

Table A --2: Supported measurements and their definition A--9........

Table B--1: File menu commands B--1............................

Table B--2: Edit menu commands B--3............................

Table B--3: Vertical menu commands B-- 4.........................

T able B--4: Horiz/Acq menu commands B--5.......................

Table B--5: Trig menu commands B--7............................

Table B--6: Display menu commands B--9.........................

Table B--7: Cursor menu commands B--11.........................

Table B--8: Measure menu commands B-- 11........................

Table B--9: Masks menu commands B--13..........................

T able B--10: Math menu commands B--14..........................

Table B--11: Application menu commands B-- 14.....................

Table B--12: Utilities menu commands B--15........................

Table B--13: Help menu commands B--16..........................

Table C--1: Masks control window functions C--4...................

Table C--2: Communication trigger functions C--5..................

Table C--3: Serial trigger functions C--7...........................

Table C--4: ITU-T masks C--35...................................

TDS6000B & TDS6000C Series User Manual

Table of Contents

Table C--5: ANSI T1.102 masks C--35..............................

T able C--6: Ethernet masks C--35.................................

Table C --7: SONET/SDH masks C--35.............................

Table C --8: Fibre Channel masks C--36............................

Table C --9: Fibre Channel Electrical masks C--36....................

Table C --10: InfiniBand masks C--37..............................

Table C--11: Serial ATA masks C--37..............................

Table C--12: USB 1.1/2.0 masks C--37..............................

Table C--13: 1394b masks C--37...................................

Table C--14: Rapid IO LP-LVDS masks C--37.......................

Table C--15: Rapid IO Serial masks C--37..........................

Table C--16: IOF masks C--38....................................

Table C --17: PCI-Express masks C--38.............................

Table C --18: SAS masks C--38....................................

Table C--19: AMI trigger standards C--39..........................

Table C--20: B3ZS trigger standards C--39.........................

Table C--21: B6ZS trigger standards C--39.........................

Table C--22: B8ZS trigger standards C--39.........................

Table C--23: CMI trigger standards C--39..........................

Table C--24: HDB3 trigger standards C--40.........................

Table C--25: MLT3 trigger standards C--40.........................

Table C--26: NRZ trigger standards C--40..........................

Table C --27: Supported communications measurements and their

definition C --41.............................................

Table C--28: ITU-T masks C--45..................................

Table C--29: ANSI T1.102 masks C--45.............................

T able C--30: Ethernet masks C--45................................

Table C --31: SONET/SDH masks C--46............................

Table C --32: Fibre Channel masks C--46...........................

Table C --33: Fibre Channel Electrical masks C--46...................

Table C --34: InfiniBand masks C--47..............................

Table C--35: Serial ATA masks C--47..............................

Table C--36: USB 1.1/2.0 masks C--47..............................

Table C--37: 1394b masks C--47...................................

Table C--38: Rapid IO LP-LVDS masks C--47.......................

Table C--39: Rapid IO Serial masks C--47..........................

Table C--40: IOF masks C--48....................................

Table C --41: PCI-Express masks C--48.............................

Table C --42: SAS masks C--48....................................

TDS6000B & TDS6000C Series User Manual

Table of Contents

Table C--43: AMI trigger standards C--49..........................

Table C--44: B3ZS trigger standards C--49.........................

Table C--45: B6ZS trigger standards C--49.........................

Table C--46: B8ZS trigger standards C--49.........................

Table C--47: CMI trigger standards C--50..........................

Table C--48: HDB3 trigger standards C--50.........................

Table C--49: MLT3 trigger standards C--50.........................

Table C--50: NRZ trigger standards C--50..........................

Table C --51: Supported communications measurements and their

definition C --51.............................................

TDS6000B & TDS6000C Series User Manual

Table of Contents

xii

TDS6000B & TDS6000C Series User Manual

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 the system. Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system.

ToAvoidFireor

Personal Injury

Use Proper Power Cord. Use only the power cord specified for this product and certified for the country of use.

Connect and Disconnect Properly. Do not connect or disconnect probes or test leads while they are connected to a voltage source.

Ground the Product. This product is grounded through the grounding conductor of the power cord. To avoid electric shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.

Powering Off. The power cord provides Mains disconnect.

Do Not Operate Without Covers. Do not operate this product with covers or panels

removed.

Use Proper Fuse. Use only the fuse type and rating specified for this product.

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 With Suspected Failures. If you suspect there is damage to this product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

Provide Proper Ventilation. Refer to the manual’s installation instructions for

details on installing the product so it has proper ventilation.

TDS6000B & TDS6000C Series User Manual

xiii

General Safety Summary

Symbols and Terms

Terms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the marking.

WARNING indicates an injury hazard not immediately accessible as you read the marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. The following symbols may appear on the product:

CAUTION

Refer to Manual

Mains Disconnected

OFF (Power)

WARNING

High Voltage

Mains Connected

ON (Power)

Protective Ground

(Earth) Terminal

Standby

xiv

TDS6000B & TDS6000C Series User Manual

Environmental Considerations

This section provides information about the environmental impact of the product.

Product End-of-Life

Handling

Observe the following guidelines when recycling an instrument or component:

Equipment Recycling. Production of this equipment required the extraction and use of natural resources. The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product’s end of life. In order to avoid release of such substances into the environment and to reduce the use of natural resources, we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately.

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 Tektronix Web site (www.tektronix.com).

Mercury Notification. This product uses an LCD backlight lamp that contains mercury. Disposal may be regulated due to environmental considerations. Please contact your local authorities or, within the United States, the Electronics Industries Alliance (www.eiae.org) for disposal or recycling information.

Restriction of Hazardous

Substances

TDS6000B & TDS6000C Series User Manual

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, mercury, and hexavalent chromium.

Environmental Considerations

xvi

TDS6000B & TDS6000C Series User Manual

Preface

About This Manual

This user manual covers the following information:

H Describes the capabilities of the instrument, how to install it and how to

reinstall its software

H Explains how to operate the instrument: how to control acquisition of,

processing of, and input/output of information

This manual is composed of the following chapters:

H Getting Started shows you how to configure and install your instrument and

provides an incoming inspection procedure.

H Operating Basics uses maps to describe the various interfaces for controlling

the instrument, including the front panel and the software user interface.

These maps provide overviews of the product and its functions from several

viewpoints.

H Reference comprises an encyclopedia of topics that describe the instrument

interface and features, and gives background and basic information on how

to use them. (The online help onboard the instrument application describes

the interface, features, and their usage; detailed descriptions of all program-

ming commands are found in the Programmer Online Guide.)

H Appendices provides additional information including cleaning information.

TDS6000B & TDS6000C Series User Manual

xvii

Preface

Product Description

This chapter describes the TDS6000B & TDS6000C Series Digital Storage Oscilloscopes and their options. Following this description are three sections:

H Installation shows you how to configure and install the instrument, as well

as how to reinstall the system software included with the product.

H Incoming Inspection provides a procedure for verifying basic operation and

functionality.

H Accessories & Options lists the standard and optional accessories for this

product.

Model Key Features

TDS6000B & TDS6000C Series instruments are high performance solutions for verifying, debugging, and characterizing sophisticated electronic designs. The series features exceptional signal acquisition performance, operational simplicity, and open connectivity to the design environment. Classic analog-style controls, a large touch-sensitive display, and graphical menus provide intuitive control. Open access to the Windows operating system enables unprecedented customization and extensibility. Key features include:

H 6 GHz bandwidth and 20 GS/s real time sampling rate, TDS6604B

H 8 GHz bandwidth and 20 GS/s real time sampling rate, TDS6804B

H 12 GHz bandwidth and 40 GS/s real time sampling rate, TDS6124C

H 15 GHz bandwidth and 40 GS/s real time sampling rate, TDS6154C

H Enhanced Bandwidth capability that, when enabled, applies Digital Signal

Process (DSP) filters that can extend the bandwidth and flatten the bandpass.

Enhanced Bandwidth has three components: magnitude correction through

the bandpass, phase linearity correction through the bandpass, and bandwidth

extension on some models.

H Record lengths up to 64,000,000 samples, depending on model and option

H Up to 2.0% DC vertical gain accuracy

H Four input channels (each with 8-bit resolution), auxiliary trigger input and

output

H Sample, envelope, peak-detect, high-resolution, waveform database, and

average acquisition modes

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Product Description

H Full programmability, with an extensive GPIB-command set and a message-

based interface

H Trigger types for both A and B Event & Delayed B Event include Edge,

Glitch, Runt, Width, Transition Time, Timeout, Pattern, State, Setup/Hold, and Window. All except Edge, Pattern, and State can be Logic State qualified by up to two channels. Trigger sensitivity is up to 4 divisions at 9 Hz. Trigger jitter is as low as >1.1 ps RMS. You can trigger on a glitch or runt of less than approximately 100 ps.

H Powerful built-in measurement capability, including histograms, automatic

measurements, eye pattern measurements and measurement statistics

H A large 10.4 inch (264.2 mm) high resolution XGA color display that

supports color grading of waveform data to show sample density

H MultiView Zoom to view and compare up to four zoom areas at a time. Lock

and manually or automatically scroll up to four zoom areas

H An intuitive, graphical user interface (UI), with online help that is built in

and available on screen

Product Software

H Internal, removable disk storage

H Wide array of probing solutions

The instrument includes the following software:

H System Software. Includes a specially configured version of Windows

preinstalled on the instrument. Windowsxpis the operating system on which the user-interface application of this product runs, and provides an open desktop for you to install other compatible applications. Do not attempt to substitute any version of Windows that is not specifically provided by Tektronix for use with your instrument.

H Product Software. Comes preinstalled on the instrument. This software,

running on Windows automatically when the instrument is powered on, and provides the user interface (UI) and all other instrument control functions. You can also minimize the instrument application.

H Support Software. The compact discs, included with the instrument, contain

additional useful software and files that can be installed on your instrument:

, is the instrument application. This software starts

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H Readme file. This file contains release notes and updates that could not

be included in other product documentation.

TDS6000B & TDS6000C Series User Manual

Software Upgrade

Product Description

H GPIB Programmer Online Help software. This software, in an online

help format, contains the information that you need to program the instrument through its GPIB interface. A printable PDF file of this information is also available on the compact disc.

H Performance Verification Procedures. The compact disc contains

instructions to perform a performance verification.

See the instructions for the compact discs for information about installing the

support software.

Occasionally new versions of software for your instrument may become available at our web site. See Contacting Tektronix on the back of the title page.

Tektronix may offer software upgrade kits for the instrument. Contact your Tektronix service representative for more information (see Contacting Tektronix on the back of the title page).

TDS6000B & TDS6000C Series User Manual

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Product Description

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TDS6000B & TDS6000C Series User Manual

Installation

Unpacking

This chapter covers installation of the instrument.

Verify that you have received all of the parts of your instrument. The Standard Accessories list shows the standard accessories that you should find in the shipping carton (probes depend on the option you ordered.) You should also verify that you have:

H The correct power cord for your geographical area.

H The compact discs that include copies of the software installed on the

instrument and additional support software that may be useful to you: the

Operating System Restore, Product Software, and Optional Applications

Software. Store the product software in a safe location where you can easily

retrieve it.

NOTE. The certificate of authenticity (Windows to the rear of your instrument. This certificate proves your ownership of the Windows operating system in your instrument. Without this certificate, you might purchase a new Windows license if the hard disk in your instrument requires rebuilding or replacement.

H All the standard and optional accessories that you ordered.

Fill out and send in the customer registration card.

licence agreement) is attached

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Installation

Checking the Environment Requirements

Read this section before attempting any installation procedures. This section describes site considerations, power requirements, and ground connections for your instrument.

Site Considerations

Connecting Peripherals

The instrument is designed to operate on a bench or on a cart in the normal position (on the bottom feet). For proper cooling, at least three inches (7.62 cm) of clearance is required on both sides of the instrument, and the bottom requires the clearance provided by the instrument feet.

If you operate the instrument while it is resting on the rear feet, make sure that you properly route any cables coming out of the rear of the instrument to avoid damaging them.

CAUTION. To prevent damage to the instrument, keep the bottom and sides of the instrument clear of obstructions for proper cooling.

The peripheral connections are the same as those you would make on a personal computer. The connection points are shown in Figure 1--1. See Table 1--1 on page 1--8 for additional connection information.

CAUTION. To avoid product damage, either power off the instrument or place the instrument in Standby power mode before installing any accessories except a USB mouse or keyboard to the instrument connectors. (You can connect and disconnect USB devices with the power on.) See Shutting Down the Instrument on page 1--9.

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TDS6000B & TDS6000C Series User Manual

Description Icon/Label Locations

Mouse

Keyboard

USB

RS-232

Printer

XVGA Out (PC only, for dual display operation)

Hard drive

USB

Installation

Mic

Audio line out

Audio line in

Instrument monitor (large-screen instrument display)

GPIB

Network

AUX IN EXT REF IN REF OUT

Figure 1- 1: Locations of peripheral connectors on rear panel

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Installation

Table 1- 1: Additional accessory connection information

Item Description

Monitor If you use a nonstandard monitor, you may need to change the

Windows your monitor. To set up a dual display, see page 1--16.

Printer Connect the printer to the EPP (enhanced parallel port)

connector directly. If your printer has a DB-25 connector, use the adapter cable that came with your printer to connect to the EPP connector. For information on printer usage, see Printing Waveforms on page 3--228.

Rackmount Refer to the Rackmount Installation Instructions for information

on installing the rackmount kit.

Other Refer to the Readme file on the Product Software CD for

possible additional accessory installation information not covered in this manual.

display settings to achieve the proper resolution for

Powering On the Instrument

Follow these steps to power on the instrument for the first time.

CAUTION. Connect the keyboard, mouse, and other accessories before applying power to the product.

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TDS6000B & TDS6000C Series User Manual

Rear panel Front panel

Installation

Connect the power cord.

Figure 1- 2: Powering on the instrument

Shutting Down the Instrument

When you push the front-panel On/Standby switch, the instrument starts a shutdown process (including a Windows shutdown) to preserve settings and then removes power from most circuitry in the instrument. Avoid disconnecting the line cord to power off the instrument.

NOTE. If you do not use the On/Standby switch to shut down the instrument before powering off the instrument, the instrument will be in the factory Default Setup when powered on the next time.

To completely remove power to the instrument, perform the shutdown just described, remove the power cord from the instrument.

If needed, push the On/Standby

switch to power on the instrument.

Backing Up User Files

You should back up your user files on a regular basis. Use the Back Up tool to back up files stored on the hard disk. The Back Up tool is located in the System Tools folder in the Accessories folder.

1. Minimize the instrument application by selecting Minimize in the File

menu.

2. Touch the Windows Start button.

3. Select All Programs, Accessories, System Tools, Backup in the Start

menu.

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Installation

Installing Software

4. Use the backup tool that displays to select your backup media and to select the files and folders that you want to back up. Use the Windows online help for information on using the Backup tool. You can back up to the CD-RW drive, USB 2.0 memory device, or to a third-party storage device over the printer port (rear panel).

The instrument system and application software is preinstalled at the factory. If you need to reinstall the software, refer to the instructions that accompany the CDs shipped with the instrument. If you need to restore the operating system, you also need the Windows license information from the Certificate of Authenticity shipped with the instrument.

Software Release Notes

Accessory Software

Read the software release notes README.TXT ASCII file on the product-software CD before performing installation procedures. This file contains additional installation and operation information that supercedes other product documentation.

To view the README.TXT file, open the Notepad Windows accessory. Then open the file on the Product Software CD.

The Product Software CD also contains accessory software and files that you can choose to install in the instrument or in another computer. Refer to the instructions that accompany the CD for installation information.

GPIB Programmer Online Help Software. You can install the GPIB Programmer online help on the instrument, but it may be more convenient to install it on the PC that is functioning as the GPIB system controller. From the system controller, you can copy and paste commands from the help directly into your test programs. The programmer information contains the following content:

H GPIB configuration information for the instrument

H Lists of the command groups and the commands they contain

H Detailed command descriptions including syntax and examples

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H Status and error messages

H Programming examples

The CD also contains a printable version of the programmer information in the form of a PDF file.

TDS6000B & TDS6000C Series User Manual

Installation

Manual Performance Verification Procedure. This is a printable PDF file that describes how to verify the instrument performance using generic test equipment.

User manual. This is a PDF file of this user manual.

Optional Accessory Software. The Optional Applications Software CD contains

programs that you can install and run five times per application. You can then purchase an upgrade from Tektronix if you decide that you want to continue to use the application. Refer to the instructions that accompany the CD for installation information.

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Installation

Desktop Applications

You can install desktop application software on the instrument. The instrument has been tested with the following software products installed:

H Microsoft Office 2000 (including Word, Excel, Powerpoint, and Access)

H MathCad

H MATLAB

Other software products may be compatible but have not been tested by Tektronix. If the instrument malfunctions after you install software, you should uninstall the software, and then reinstall the instrument application to restore proper operation.

Exiting the Instrument Application. Before installing other desktop applications, you should exit the instrument application. Follow these steps to exit the instrument application:

NOTE. If you are not using a USB keyboard and mouse, you must power on the instrument after attaching your keyboard and mouse.

1. Connect a keyboard and mouse to the instrument.

Options

2. While holding down the CTRL and ALT keys, press the DELETE key.

3. Select Task Manager.

4. In the Applications tab, select TekScope.exe, and then select End Process to

stop the instrument application.

The instrument application will restart after you restart the entire system, following the installation of the desktop application software.

Some options contain software that must be installed and/or enabled. To do the installation, follow the specific instructions that come with the option.

Tektronix provides a key that you must enter (one time) to enable all the options that you have purchased for your instrument. To enter the key, select Option Installation in the Utilities menu, and then follow the on-screen instructions.

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TDS6000B & TDS6000C Series User Manual

Removing the Removable Hard Drive

The removable hard drive is preinstalled at the factory. You can secure data separate from the instrument with the removeable hard drive. To remove the hard drive follow these steps:

1. Verify that the instrument is powered off.

2. Set the instrument so its bottom is down on the work surface and its rear

panel is facing you. See Figure 1--3 on page 1--13. Note, if you have option FHD installed on your instrument, the front panel should be facing you instead of the rear panel.

3. Loosen the thumb screws that secure the hard drive to the drive tray.

4. Grasp the hard disk drive assembly by the thumb screws and pull until the

handle is exposed. Grasp the handle and pull the hard drive assembly straight out of the instrument.

Installation

oosen thumb screws

Remove the

hard disk drive

Figure 1- 3: Removing the hard drive

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Installation

Reinstalling the Removable Hard Drive

To reinstall the hard drive follow these steps. See Figure 1--4 on page 1--14.

1. Verify that the instrument is powered off.

2. Leaving the cover/handle extended, push the hard drive assembly into place

until it stops, ensuring that it is straight. Push the hard drive assembly firmly to ensure that the connector is seated properly.

3. Slide the cover/handle in until it stops. It will be alsmost flush with the back panel.

4. Finger tighten the two thumb screws to ensure that the removeable hard drive is properly seated.

Figure 1- 4: Reinstalling the hard drive

Tighten the

thumbscrews

Push the hard disk

drive straight in

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TDS6000B & TDS6000C Series User Manual

Enabling or Disabling Your LAN and Connecting to a Network

You can connect the instrument to a network to enable printing, file sharing, internet access, and other communications functions. Before you make the connection, do the following steps to enable (the default) network access to the instrument:

Power

down

Installation

Rear panelFront panel

Power

Connect a keyboard

and mouse

Figure 1- 5: Enabling your LAN and connecting to a network

4. As the instrument begins to boot, press the F2 key on the keyboard repeatedly until the message “Entering SETUP” (“Loading SETUP” on some instruments) appears.

5. In the BIOS Setup Utility, use the right-arrow key on the keyboard to highlight the Advanced menu at the top of the screen.

6. Use the arrow down key to highlight Peripheral Configuration in the Advanced screen, and then press Enter.

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Installation

7. Use the arrow down key to highlight Ou tboard LAN in the Peripheral Configuration screen, and then press Enter.

8. Use the arrow up or down key to highlight Enabled, and then press Enter.

9. Press the F10 key to save and exit. C onfirm the Save of Configuration

changes when you are prompted on screen.

10. Use the Windows network setup utility to define the instrument as a network client and configure it for your network. You can find the network setup utility in the Windows Start menu if you select Settings > Control Panel and then double-click Network. Consult your network administrator for specific instructions to make these settings.

NOTE. If you want to disable network access for the instrument, perform the above procedure except substitute Disabled for the command listed in step 8. The instrument will boot faster with network access disabled.

Setting up a Dual Display

Use the following steps to set up the instrument for dual display operation. You can operate the instrument while having full use of Windows and other applications on the external monitor.

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TDS6000B & TDS6000C Series User Manual

Use the On/Standby switch to power down.

Connect a keyboard and mouse.

Connect an external monitor.

Installation

Power on

Figure 1- 6: Setting up a dual display

6. Watch for a message on the external monitor telling you that Windows has successfully initialized the display adapter.

7. The instrument should detect that the new monitor was connected. Follow the instructions on the instrument display to install new drivers for the monitor.

8. Type a Control-M to minimize the instrument application.

9. In the Windows desktop, right-click the mouse, and then select Properties to

display the Display Properties dialog box.

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Installation

10. Select the Settings tab, and select the grayed-out monitor in the display box.

11. Select yes when you are prompted to enable the new monitor.

12. Set the resolution that you want to use on the external monitor.

13. Click on the external monitor in the display box, and drag it to the correct

orientation.

CAUTION. Do not change the resolution or color settings for the internal LCD monitor. The internal resolution must be 1024 x 768 and the color setting must be True Color (24 bit).

14. Select OK to apply the settings. The new monitor will display additional desktop area.

To make the best use of the new display area, do these additional steps to move the Windows controls to the external monitor:

1. Click (and hold) on the Windows task bar in the area shown in Figure 1--7, and then drag it upwards and toward the external monitor. The task bar will first go to the side of the internal monitor, then to the side of the external monitor, and finally to the bottom of the external monitor.

Figure 1- 7: Drag area for Windows task bar

2. Release the mouse when the task bar is where you want it to be.

Click here to drag task bar.

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TDS6000B & TDS6000C Series User Manual

Installation

Select all

Internal monitor

Drag

Drop

External monitor

Figure 1- 8: Moving Windows desktop icons to the external monitor

4. If you use the instrument help system, you can drag the help windows to the external monitor so that you can read them while you operate the instrument.

5. When you open any Windows application, drag the windows from the application to the external monitor.

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Installation

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TDS6000B & TDS6000C Series User Manual

Incoming Inspection

This chapter contains instructions for performing the Incoming Inspection Procedure. This procedure verifies that the instrument is operating correctly after

shipment, but does not check product specifications.

If the instrument fails any test within this section, it may need service. To contact Tektronix for service, see Contacting Tektronix on the back of the title page.

Make sure you have put the instrument into service as detailed in Installation starting on page 1--5. Then assemble the following test equipment and proceed with the procedures that follow.

Self Tests

This procedure uses internal routines to verify that the instrument functions and was adjusted properly. No test equipment or hookups are required.

Equipment required

Prerequisites Power on the instrument and allow a 20 minute warm-up before doing

1. Verify that internal diagnostics pass: Do the following substeps to verify passing of internal diagnostics.

a. Display the System diagnostics menu:

H If the instrument is in toolbar mode, touch the MENU button to put

the instrument into menu bar mode.

H From the Utilities menu, select Instrument Diagnostics . . . . This

displays the diagnostics control window.

b. Run the System Diagnostics:

H First disconnect any input signals and probes from all four channels.

H Touch the Run button in the diagnostics control window.

c. Wait: The internal diagnostics do an exhaustive verification of proper

instrument function. This verification will take several minutes. When the verification is finished, the resulting status will appear in the diagnostics control window.

None

this procedure.

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Incoming Inspection

NOTE. If diagnostic error message 512 is displayed, run signal-path compensation and then rerun Instrument Diagnostics.

d. Verify that no failures are found and reported on-screen. All tests should

pass.

e. Run the signal-path compensation routine:

H From the Utilities menu, select Instrument Calibration . . . . This

displays the Instrument Calibration control window.

H Touch the Calibrate button to start the routine.

f. Wait: Signal-path compensation may take five to ten minutes to run.

g. Confirm signal-path compensation returns passed status: Verify that the

word Pass appears in the instrument calibration control window.

2. Return to regular service: Touch the Close button to exit the instrument calibration control window.

Functional Tests

The purpose of these procedures is to confirm that the instrument functions properly.

NOTE. These procedures verify that the instrument features operate. They do not verify that they operate within limits.

Therefore, when the instructions in the functional tests that follow call for you to verify that a signal appears on-screen “that is about five divisions in amplitude” or “has a period of about six horizontal divisions,” and so forth, do not interpret the quantities given as limits.

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TDS6000B & TDS6000C Series User Manual

Incoming Inspection

NOTE. Do not make changes to the front-panel settings that are not called out in the procedures. Each verification procedure will require you to set the instrument to certain default settings before verifying functions. If you make changes to these settings, other than those called out in the procedure, you may obtain invalid results. In this case, repeat the procedure from step 1.

When you are instructed to press a front-panel button or screen button, the button may already be selected (its label will be highlighted). If this is the case, it is not necessary to push the button.

Check Vertical Operation

Equipment required

Prerequisites None

One BNC cable

One 015-1018-00, SMA male-to-BNC female adapter

TDS6000B or TDS6000C Digital Storage Oscilloscope

1. Initialize the instrument: Push the front-panel DEFAULT SETUP button.

2. Hook up the signal source: Connect the equipment as shown in Figure 1--9

to the channel input you want to test (beginning with CH 1).

NOTE. Connect the FAST EDGE output (labeled PROBE COMPENSATION on some TDS6000B instruments) to the channel input using a SMA cable and adapters.

3. Turn off all channels: If any of the front-panel channel buttons are lighted, push those buttons to turn off the displayed channels. See Figure 1--10.

4. Select the channel to test: Push the channel button for the channel you are currently testing. The button lights and the channel display comes on.

Instrument under test

Figure 1- 9: Universal test hookup for functional tests - CH 1 shown

TDS6000B & TDS6000C Series User Manual

SMA cable from FAST EDGE output to CH 1 input

1- 23

Incoming Inspection

Channel buttons

Figure 1- 10: Channel button location

5. Set up the instrument:

H Push the front-panel AUTOSET button. This sets the horizontal and

vertical scale and vertical offset for a usable display and sets the trigger source to the channel that you are testing.

H Touch the Vert button and then touch Offset. Confirm that the Ch1

Offset is 0V.

6. Verify that the channel is operational: Confirm that the following statements are true.

H Verify that the vertical scale readout and the waveform amplitude for the

channel under test (without a probe) are as shown in Table 1--2.

Table 1- 2: Vertical settings

Setting TDS6604B, TDS6804B TDS6124C, TDS6154C

Scale 100 mV 100 mV

Waveform amplitude 3 divisions 4.4 divisions

H The front-panel vertical POSITION knob (for the channel you are

testing) moves the signal up and down the screen when rotated.

H Turning the vertical SCALE knob counterclockwise (for the channel you

are testing) decreases the amplitude of the waveform on-screen, turning the knob clockwise increases the amplitude, and returning the knob to the original scale setting returns the amplitude to that shown in Table 1--2 for that scale setting.

1- 24

7. Verify that the channel acquires in all acquisition modes: From the

Horiz/Acq menu, select Horizontal/Acquisition Setup . . . . Touch the

TDS6000B & TDS6000C Series User Manual

Incoming Inspection

Acquisition tab in the control window that displays. Touch each of the acquisition modes and confirm that the following statements are true (see Using the Acquisition Controls on page 3--18 for more information):

H Sample mode displays an actively acquiring waveform on-screen. (Note

that there is a small amount of noise present on the square wave).

H Peak Detect mode displays an actively acquiring waveform on-screen

with the noise present in Sample mode “peak detected.”

H Hi Res mode displays an actively acquiring waveform on-screen with the

noise that was present in Sample mode reduced.

H Average mode displays an actively acquiring waveform on-screen with

the noise reduced.

H Envelope mode displays an actively acquiring waveform on-screen with

the noise displayed.

H Waveform Database mode displays an actively acquiring waveform

on-screen that is the accumulation of several acquisitions.

Check Horizontal

Operation

8. Test all channels: Repeat steps 2 through 7 until all four input channels are verified.

9. Remove the test hookup: Disconnect the equipment from the channel input and the FAST EDGE output.

Equipment required

Prerequisites None

One SMA cable, such as Tektronix part number 174-1427-xx

One TCA-SMA adapter

1. Initialize the instrument: Push the front-panel DEFAULT SETUP button.

2. Hook up the signal source: Connect the equipment to the CH 1 input as

shown in Figure 1--11.

TDS6000B & TDS6000C Series User Manual

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Incoming Inspection

Instrument under test

SMA cable from FAST EDGE output to CH 1 input

Figure 1- 11: Setup for time base test

3. Set up the instrument: Push the front-panel AUTOSET button.

4. Touch the Vert button and then touch Offset. Adjust the Ch1 Offset to

--0.16 V (TDS6000B Series); +80 mV (TDS6000C Series) using the

multipurpose knob.

5. Set the Vertical SCALE to 100 mV per division.

6. Set the time base: Set the horizontal SCALE to 200 s/div. The time-base

readout is displayed at the bottom of the graticule.

7. Verify that the time base operates: Confirm the following statements.

H One period of the square-wave fast edge signal is about five horizontal

divisions on-screen for the 200 s/div horizontal scale setting.

H Rotating the horizontal SCALE knob clockwise expands the waveform

on-screen (more horizontal divisions per waveform period), counterclockwise rotation contracts it, and returning the horizontal scale to 200 s/div returns the period to about five divisions.

H The horizontal POSITION knob positions the signal left and right

on-screen when rotated.

8. Verify horizontal delay:

a. Center a rising edge on screen:

H Set the horizontal POSITION knob so that the rising edge where the

waveform is triggered is lined up with the center horizontal graticule.

1- 26

H Change the horizontal SCALE to 20 s/div. The rising edge of the

waveform should remain near the center graticule and the falling edge should be off screen.

TDS6000B & TDS6000C Series User Manual

Incoming Inspection

b. Turn on and set horizontal delay:

H From the Horiz/Acq menu, select Horizontal/Acquisition

Setup....

H Touch the Horizontal tab in the control window that displays.

H Touch the Delay Mode button to turn delay on.

H Double-touch the Horiz Delay control in the control window to

display the pop-up keypad. Touch the keypad buttons to set the horizontal delay to 1.5 ms, and then touch the ENTER key.

c. Verify the waveform: Verify that a falling edge of the waveform is within

a few divisions of center screen.

d. Adjust the horizontal delay: Rotate the upper multipurpose knob to

change the horizontal delay setting. Verify that the falling edge shifts horizontally. Rotate the front-panel horizontal POSITION knob. Verify that this knob has the same effect (it also adjusts delay, but only when delay mode is on).

Check Trigger Operation

e. Verify the delay toggle function:

H Rotate the front-panel horizontal POSITION knob to center the

falling edge horizontally on the screen.

H Change the horizontal SCALE to 40 ns/div. The rising edge of the

waveform should remain near the center graticule.

H Set horizontal DELAY to ' -- 8 0 n s . The rising edge should be

2 divisions to the right of the center graticule line.

H Push the front-panel DELAY button several times to toggle delay off

and on and back off again. Verify that the display switches quickly between two different points in time.

9. Remove the test hookup: Disconnect the equipment from the channel input and the FAST EDGE output.

Equipment required

Prerequisites None

One BNC cable, such as Tektronix part number 174-1427-xx

One TCA-SMA TekConnect adapter

1. Initialize the instrument: Push the front-panel DEFAULT SETUP button.

2. Hook up the signal source: Connect the equipment to the CH 1 input as

shown in Figure 1--12.

3. Set up the instrument: Push the front-panel AUTOSET button.

TDS6000B & TDS6000C Series User Manual

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Incoming Inspection

Instrument under test

SMA cable from FAST EDGE output to CH 1 input

Figure 1- 12: Setup for trigger test

4. Touch the Vert button and then touch Offset. Adjust the Ch1 Offset to

--0.16 V (TDS6000B Series); +80 mV (TDS6000C Series) using the

multipurpose knob.

5. Set the Vertical SCALE to 100 mV per division.

6. Verify that the main trigger system operates: Confirm that the following

statements are true.

H The trigger level readout for the A (main) trigger system changes with

the trigger-LEVEL knob.

H The trigger-LEVEL knob can trigger and untrigger the square-wave

signal as you rotate it. (Leave the signal untriggered).

H Pushing the front-panel trigger LEVEL knob sets the trigger level to the

50% amplitude point of the signal and triggers the signal that you just left untriggered. (Leave the signal triggered.)

7. Verify that the delayed trigger system operates:

a. Set up the delayed trigger:

H From the Trig menu, select A→B Sequence . . . . This displays the

A→B Sequence tab of the trigger setup control window.

H Touch the Trig After Time button under A Then B.

H Touch the B Trig Level control in the control window.

b. Confirm that the following statements are true:

1- 28

H The trigger-level readout for the B trigger system changes as you

turn the lower multipurpose knob.

TDS6000B & TDS6000C Series User Manual

Incoming Inspection

H As you rotate the lower multipurpose knob, the square-wave FAST

EDGE signal can become triggered and untriggered. (Leave the signal triggered.)

c. Verify the delayed trigger counter:

H Set trigger mode to norm.

H Double-touch the Trig Delay control to pop up a numeric keypad for

that control.

H Touch the keypad to enter a trigger delay time of 1000 ms,andthen

touch Enter.

H Verify that the trigger READY indicator on the front panel flashes

about once every second as the waveform is updated on-screen.

8. Remove the test hookup: Disconnect the equipment from the channel input and the FAST EDGE output.

Perform the Extended Diagnostics

Extended diagnostics and self calibration perform a more detailed functionality check than the incoming inspection and Power-on diagnostics.

NOTE. Allow a 20-minute warm-up before running the self calibration.

Disconnect any attached signal from the instrument. Then select the Utilities menu. Run the self calibration followed by the extended diagnostics by first selecting the Instrument Calibration (see page 3--139 for additional information on signal path compensation) and then the Instrument Diagnostics tabs. Results of the tests display on their property pages.

Checking the Underlying

System (Optional)

To check the hardware and Windows software underlying the instrument UI (user interface), run the CheckIt Utilities from the Windows Start menu:

1. Minimize the instrument application before running the external diagnostics. From the File menu select Minimize.

2. Touch Start, then touch Programs in the Start Menu. Finally, touch CheckIt Utilities.

3. From the Go To menu, select and run the tests you want to perform.

4. Check test results. All tests except the Modem and CD-ROM tests should

pass. The CD-ROM test requires data from the CheckIt Utilities CD.

TDS6000B & TDS6000C Series User Manual

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Incoming Inspection

5. Dismiss the CheckIt Utilities: S elect Exit in the File menu.

6. Restart your instrument UI software: On the Quick Launch bar, touch TekScope.

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TDS6000B & TDS6000C Series User Manual

Operating Basics

Operational Maps

This chapter acquaints you with how the instrument functions and operates. It consists of several maps that describe the system, its operation, and its documentation:

H Documentation Map, lists the documentation that supports the instrument.

H System Overview Maps, describe the high-level operating blocks and

H User-Interface Map, describes the elements of the User Interface (UI)

H Front-Panel Map, describes the elements of the instrument front panel and

H Display Map, describes elements and operation of single-graticule and

H Front Panel I/O Map, describes inputs, outputs, and peripherals.

H Rear Panel I/O Map, describes input/output ports and peripherals.

operating cycle of the instrument.

application, which provides complete control of the instrument.

cross references information relevant to each element.

multiple-graticule displays.

Tutorial (How to?) procedures are available online, as part of the online help.

For information on configuring and installing your instrument, refer to Chapter 1, Getting Started.

TDS6000B & TDS6000C Series User Manual

2- 1

Documentation Map

This instrument ships with documents individually tailored to address different aspects or parts of the product features and interface. The table below cross references each document to the instrument features and interfaces it supports.

To read about… Refer to these documents: Description

Installation, Specifications, & Operation (overviews)

In Depth Operation and UI Help Online Help System

GPIB Commands

User Manual Quick Start User Manual Product Software CD

Online Programmers Guide

Read the Quick Start User Manual for a quick overview of instrument features and their usage.

Read the User Manual for general information about your instrument—procedures on how to put it into service, maps of its user interface controls, overviews and background on its features.

Product Software CD includes Specifications of performance.

For more usage information, see Online Help System below.

Access online help from the instrument for context-sensitive information on virtually all controls and elements on screen.

Online help includes procedures for using instrument functions. Online help includes a list of Options and accessories.

Quickly find the syntax of a command, and copy the command if desired. Read about communication, error handling, and other information on GPIB usage. This guide is on the product software CD.

Analysis and Connectivity Tools

2- 2

Oscilloscope Analysis and Connectivity Made Easy

TekVISA Programming Manual VXIplug&play Driver Help TekVISA Excel Toolbar Help

TDS6000B & TDS6000C Series User Manual

These documents consists of various connectivity and analysis tools that you can install and configure for your instrument. For more information, see the Analysis and Connectivity Support topic in the instrument online help.

System Overview Maps

The instrument is a highly capable waveform acquisition, test, and measurement system. The following model provides background information on its operation, which, in turn, may provide you insight on how the instrument can be used.

Functional Model Map

CH 1--4

Recovered clock output

Recovered data output

Digital Signal Acquisition

Input channels

Acquisition

Amplitude

scaling

page 3--12

Trigger system

page 3--43

page 3--17

pages 3--98,

system

Timebase

system

3--145

Signal Processing

& Transformation

DSP

pages 3--119, 3--145,

Output &

Storage

CH 1--4

Ref 1--4

Math 1-- 4

Display & UI

Page 3--97

The model comprises four high-level subsystems or processes (embodying a variety of hardware and software functions) and the data that connects them:

H Digital Signal Acquisition System. Acquires a waveform record from each

signal that you input to each channel using the following subsystems:

H Input Channels. Conditions the input signal, primarily through the use

of analog hardware, before the signal is converted to digital form.

H Trigger System. Recognizes a specific event of intereston the input trigger

signal and informs the Timebase of the occurrence of the event. Recovered clock and data signals are optional on TDS6000B & TDS6000C Series Digital Storage Oscilloscope.

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System Overview Maps

H Timebase System. Tells the Acquisition system to start an acquisition

cycle (that is, to convert from analog to digital). In more general terms, synchronizes the capturing of digital samples in the Acquisition system to the trigger events generated from the Trigger system.

H Acquisition System. Performs the actual A/D conversion and storing of

digital samples.

H DSP Transformation System. Performs a variety of transformations or

operations, beginning with the most fundamental data element(s) in the system, the Channel Waveform(s). Waveform math operations, automatic measurements, spectral waveforms, and histogram generation are examples.

H Input/Output Systems. Provides output (and sometimes input) of instru-

ment-data elements in a form suitable to the user and also provides user input control.

The process overview that follows describes each step in the top-level cycle of instrument operation.

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TDS6000B & TDS6000C Series User Manual

Process Overview Map

System Overview Maps

Process Overview

Yes

Stop condition?

Implement

pretrigger points

Idling...

setup

Acquire

Trigger

accepted

Yes

Reset Abort Power on Power down Arm

Process Block Description

1. The instrument starts in the idle state; it enters this state

upon power up, upon receiving most control setting changes, or upon finishing acquisition tasks.

2. Control settings are implemented as they are requested. When you toggle the RUN/STOP control to RUN, the instrument starts the hardware.

3. The instrument acquires samples until the pretrigger portion of the waveform record (channel) being acquired is filled.

4. The instrument then begins waiting for a trigger. Acquiring continues to take place, keeping the pretrigger points current, until triggering criteria are met or a trigger is forced (Auto trigger mode only) and the instrument accepts a trigger.

Acquire

posttrigger

points

Waveform

record

complete?

Yes

Waveform

available

TDS6000B & TDS6000C Series User Manual

5. The instrument acquires samples until the posttrigger portion of the waveform record (channel) being acquired is filled.

6. If averaging, enveloping, or waveform database is on, the record becomes part of the multi-acquisition record that these modes produce. The process loops back to step 3 above to acquire additional records until the number of acquisitions required for the acquisition mode currently set are processed, and then processing continues to step 7 below.

7. At this point the acquisition record is in waveform memory and is available to the instrument for measurement of its parameters, display, and so on.

The instrument then checks for a user-specified stop condition and either returns to its idle state or continues at step 3, according to what it finds.

2- 5

User Interface Map -- Complete Control and Display

Menu Bar: Access to data I/O,

Status Bar: Display of

acquisition status, mode, and

number of acquisitions; trigger

status; warnings; date; and time

Display: Live, reference, and

math waveforms display here,

along with cursors

Waveform Handle: Touch and drag

to change vertical position of

waveform. Touch the handle and

change the position and scale using

the multipurpose knobs

Controls Status: Quick reference to

vertical, horizontal, and trigger

selections, scale, and parameters

If a setup menu is displayed, these

readouts move to the graticule area

Right--click Acquisition mode

Right--click Graticule

printing, online help system, and

instrument functions here

Buttons/Menu. Touch to toggle between toolbar and menu bar modes

Multipurpose Knob Readouts. Adjust

parameters controlled by multipurpose knobs

Readouts: Display cursor readouts and

Right--click Trigger level

measurement readouts in this area, selectable from the menu bar or toolbar

2- 6

Right--click Channel waveform handle

Right--click Statistics

TDS6000B & TDS6000C Series User Manual

Front-Panel Map -- Quick Access to Most Often Used Features

Use these buttons to start and stop acquisition or start a single

acquisition sequence. The ARM, READY, and TRIG’D lights

Turn knob to adjust waveform intensity. Page 3-- 111.

Use these knobs and buttons to set the trigger parameters. Push

ADVANCED to display additional trigger functions. Pages 3--43

Push to return settings to default values. Page 3--10.

Horizontally scale, position, delay, and set record length

show the acquisition status. Page 3 --53.

and 3--59.

Push to turn cursors on or off. Page 3--130.

Push to make a hard copy. Page 3--228.

(resolution) of selected waveform. Page 3-- 14.

Push to automatically set up the vertical, horizontal, and trigger

Turn the multipurpose knobs to adjust parameters selected from

the screen interface. Push a Fine button to toggle between

Push MultiView Zoomt to add a magnified graticule to the

display. Push HORIZ or VERT to select the axis to magnify.

Turn channel displays on and off. Vertically scale or position the

controls based on selected channels. Page 3--9.

normal and fine adjustment with its multipurpose knob.

Page 3--133.

Push to turn the touch screen on and off. Page 3--102.

Page 3--105.

waveform. Page 3--2.

TDS6000B & TDS6000C Series User Manual

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Display Map -- Single Graticule

Drag icon to change the trigger

level

Drag cursors to measure

waveforms on screen

Drag the position icons to

reposition a waveform

Click icon to assign multipurpose

knobs to waveform vertical

position and scale

Drag across the waveform area to

zoom the boxed waveform segment.

Also enable/disable histograms and

measurement gating

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TDS6000B & TDS6000C Series User Manual

Front Panel I/O Map

CD -- RW Drive, with Option FHD installed, Hard Drive

FAST EDGE (SMA output) Probe

Compensation on some models

RECOVERED CLOCK (SMA output)

RECOVERED DATA (SMA output)

DC PROBE CAL (BNC output)

AUX TRIG OUT (BNC output)

USB 2.0

Ground terminal

Channel

inputs

TDS6000B & TDS6000C Series User Manual

2- 9

Rear Panel I/O Map

Removable hard disk drive to provide individual

environment for each user or to secure data;

loosen and then pull on thumb screws to release

the disk

CD-RW drive with option FHD

Connectors for speaker and microphone

USB 2.0 connectors for mouse, keyboard,

or other peripherals (4 ports)

PS-2 connector for mouse

PS-2 connector for keyboard

RJ-45 connector to connect to network

Upper VIDEO port to connect a monitor for

dual-monitor operation

COM1 serial port

Parallel port (Centronics) to connect printer or

other device

Lower XGA port to replicate the oscilloscope display

on an external monitor

GPIB port to connect to controller

Auxiliary input (external trigger) input, External

reference input and reference output

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TDS6000B & TDS6000C Series User Manual

Reference

Acquiring Waveforms

Before you can do anything (display, print, measure, analyze, or otherwise process) to a waveform, you must acquire the signal. This instrument comes equipped with the features that you need for capturing your waveforms before further processing them according to your requirements. The following topics cover capturing signals and digitizing them into waveform records:

H Signal Connection and Conditioning: How to connect waveforms to the

instrument channels; how to scale and position the channels and timebase for acquiring waveforms.

H Setting Acquisition Contr ols: How to choose the appropr iate acquisition mode

for acquiring your wave for ms; how to start and stop acquisition.

H Acquisition Control Background: Background information on the data

sampling and acquisition process.

H Using FastFrame: Using FastFrame to capture many records in a larger

record, and then view and measure each record individually.

Channel

inputs

Auxiliary

trigger input

Storage

Input Display

Trigger

Acquisition

system

Waveform

transform

system

Horizontal

time base

TDS6000B & TDS6000C Series User Manual

3- 1

Acquiring Waveforms

NOTE. This section describes how the vertical and horizontal controls define the acquisition of live waveforms. These controls also define how all waveforms are displayed, both live and derived waveforms (math waveforms, reference waveforms, and so on). The sections that follow cover display-related usage:

H Displaying Waveforms on page 3--97.

H Creating and Using Math Waveforms on page 3--145.

Signal Connection and Conditioning

This section presents overviews of the instrument features related to setting up the input signal for digitizing and acquisition. It addresses the following topics:

H How to turn on channels and adjust vertical scale, position, and offset

H How to set horizontal scale, position, and access record-length and trigger-

position controls

H How to get a basic trigger on your waveform

NOTE. Terminology: This manual uses the terms vertical acquisition window and horizontal acquisition window throughout this section and elsewhere. These

terms refer to the vertical and horizontal range of the segment of the input signal that the acquisition system acquires. The terms do not refer to any windows or display windows on screen.

Figure 3--1 shows the model for each input channel.

Scale = K1 * K2 * K3

Probe

Coupling

---

Verti cal

offset

K1K2 K3

Internal

attenuation

Input

termination

Figure 3- 1: Input and Acquisition Systems and Controls

50 Ω

Verti cal

scale

Verti cal

position

To t he

Bandwidth

limit

remainder of the acquisition system

3- 2

TDS6000B & TDS6000C Series User Manual

Acquiring Waveforms

Use input conditioning to ensure the instrument acquires the data that you want to display, measure, or otherwise process. To ensure the best possible data for displaying and further processing, do the following:

H Set the vertical scale to control the size of the vertical acquisition window

for each channel to capture part or all of the vertical amplitude of the input signal. When vertical scaling is set to capture only a fraction of the input signal range (for increased detail), the vertical offset control may be used to determine which portion of the input signal is captured by the vertical acquisition window.

H Set horizontal scale to control the size of the horizontal acquisition window

to capture as much as you want of the input signal(s). Set the horizontal position to delay the window relative to a trigger and to control where in the input signal (data stream) that the horizontal acquisition window acquires.

For more background on acquisition window concepts, see Input Conditioning Background on page 3--11.

The instrument can automatically obtain and display a stable waveform of usable size. Pushing the Autoset button automatically sets up the instrument controls based on the characteristics of the input signal. Autoset is much faster and easier than a manual control-by-control setup.

Connecting and

Conditioning Your Signals

The instrument can also be reset to its factory default settings.

Usage of some input conditioning controls or features may be limited when other control settings are in effect. Voltage offset is incompatible with reference waveforms because offset is an acquisition control.

Read the following topics related to waveform acquisition; they provide details that can make it easier to set up and acquire your waveforms.

Probes and Signal Connection. Select the probe or cable that brings the signal into the instrument. Choose the probe or cable that best fits your acquisition task, whether it is connecting an active probe to test a digital circuit, or connecting to a test fixture through SMA cables to characterize a device. The connection to the instrument depends on your application.

Tektronix provides a variety of probes and cables for this product. Check your Tektronix catalog for connection accessories that may support your application. More information about your probes can be found in the user manual for your probes.

Four acquisition channels are available. Each channel can be displayed as a waveform or can contribute waveform data to other waveforms (math and reference waveforms for example).

TDS6000B & TDS6000C Series User Manual

3- 3

Acquiring Waveforms

Coupling. All instruments and probes specify a maximum signal level.

CAUTION. Exceeding the maximum limit, even momentarily, may damage the input channel. Use external attenuators, if necessary, to prevent exceeding the limits.

Coupling determines whether an input signal is directly connected to the input channel or not connected at all. These choices are referred to as DC coupling, and GND coupling.

The input resistance of each input channel is 50 Ω. To properly terminate signals in other impedance environments, use an adapter.

All probes expect a specific coupling and input termination. Both coupling and input termination resistance are displayed on screen.

Scaling and Positioning. These key controls determine the portion of the input signal presented to the acquisition system:

H Set vertical scaling, positioning, and DC offsets to display the features of

interest on your wavefor m and avoid clipping. (See Note that follows.) Vertical Acquisition Window Considerations on page 3--12 descr ibes the vertical acquisition window.

Acquired waveform Displayed waveform

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TDS6000B & TDS6000C Series User Manual

Acquiring Waveforms

H Set horizontal scale, position, and resolution (record length) so that the

acquired waveform record includes the waveform attributes of interest with good sampling density on the waveform. The settings that you make define the horizontal acquisition window (see Horizontal Acquisition Window Considerations on page 3--14).

NOTE. Waveform data outside the vertical acquisition window is clipped; that is, the data is limited to the minimum or maximum boundaries of the vertical acquisition window. This limiting causes inaccuracies in amplitude-related measurements. Note that the acquisition window also includes 1 division above and below the displayed graticule area. See V e r tica l Acquisition Window Considerations on page 3--12.

Enhanced Bandwidth. When setting up the vertical controls, you may want to set Enhanced Bandwidth on or off. When on, DSP filtering can provide a shorter risetime, and flattens the bandpass, but makes the phase response linear and may extend bandwidth depending on model. Enhanced Bandwidth provides a matched response across enabled channels, so you will leave it on for most applications, except for those for which you would rather use the true analog bandwidth of your instrument. Display the Online help on the Vertical Setup Control Window for more information.

Trigger and Display. Set basic trigger controls to gate waveform acquisition, and use the display to interactively scale, position, and offset waveforms. See the sections Triggering on page 3--43 and Displaying Waveforms on page 3--97.

Flexible Control Access. This manual focuses on basic setup through the front panel, and then through use of the User Interface (UI) Application displayed on screen. The online help system also documents the UI.

TDS6000B & TDS6000C Series User Manual

3- 5

Acquiring Waveforms

To Set Up Signal Input

Use the procedure that follows when setting up the instrument to scale and position input signals for acquisition. For more information, display online help while performing the procedure.

Overview To set up signal input Related control elements and resources

Prerequisites

Connect input

signal

1. The acquisition system should be set to run continuously.

See page 3--24 for acquisition setup and

page 3--43 for trigger setup.

2. Connect to the signal to be acquired using proper probing and connecting techniques.

Note. For more details on control over input setup, push the Vert button to display the Vertical control window, and then touch the HELP button.

Select the

input signal

channel

Select input

coupling

3. Push a channel button (CH 1--CH 4) to select the signal channel.

A channel button lights when its channel is on.

4. Touch Vert to display the Vertical control window. To change the input coupling, select the channel tab and then select from:

H DC to couple both the AC and DC components of

an input signal

H GND to disconnect the input signal from the

acquisition

Touch Close to close the window.

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TDS6000B & TDS6000C Series User Manual

Overview Related control elements and resourcesTo set up signal input (Cont.)

Acquiring Waveforms

Set vertical

acquisition

window

5. Use the vertical knobs to scale and position the waveform on screen.

Positioned vertically Scaled vertically

Dragging the waveform handle also positions the waveform.

6. Touch Vert to display the Vertical control window. To change the offset, touch the Offset control and turn the multipurpose knob to adjust the offset.

Set horizontal

acquisition

7. Use horizontal knobs to scale and position the waveform on screen and to set record length.

window

The Resolution knob sets the record length. (See discussion on page 3--15.)

If required to stabilize the display, push LEVEL to set the trigger level to 50%.

TDS6000B & TDS6000C Series User Manual

Dragging the reference icon also positions the waveform.

Positioned horizontallyScaled horizontally

3- 7

Acquiring Waveforms

Overview Related control elements and resourcesTo set up signal input (Cont.)

For help

Continue with

acquisition

setup

8. For more information on the controls described in this procedure, push the Vert or Horiz button. Touch the HELP button in the toolbar.

9. To finish acquisition setup, you must set the acquisition mode and start the acquisition.

See To Set Acquisition Modes on page 3--24.

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TDS6000B & TDS6000C Series User Manual

Acquiring Waveforms

To Autoset the Instrument

Autoset automatically sets up the instrument controls (acquisition, display, horizontal, trigger, and vertical) based on the characteristics of the input signal.

Autoset is much faster and easier than a manual control-by-control setup. When the input signal is connected, do an autoset to automatically set up the instrument:

Overview To autoset the instrument Control elements and resources

Prerequisites

Execute

1. Signals must be connected to channels. A triggering source must be provided.

See page 3--43 in this manual for trigger setup information.

2. Push the Autoset button to execute an Autoset.

If you use Autoset when one or more channels are displayed, the instrument selects the lowest numbered channel for horizontal scaling and triggering. All channels in use are individually vertically scaled.

If you use Autoset when no channels are displayed, the instrument turns on channel one (CH 1) and scales it.

Execute

Autoset Undo

Prompt

Done

3. The Autoset Undo control window opens automatically

after an Autoset operation. Touch Undo if you want to undo the last Autoset.

Only the parameters that were set by the last Autoset are undone. Parameters that you changed that are not controlled by Autoset retain their settings.

If you don’t want this window to appear, set the Utilities/User Preferences/Autoset Undo button to Off. You can still do an Autoset Undo using the Horiz/Acq menu.

4. Select User Preferences in the Utilities menu to display the Prompt Before Action window. Touch Autoset to toggle between ON and OFF:

H OFF to set up for performing an autoset when the

AUTOSET button is pushed

H ON to set up for displaying a prompt before

performing an autoset when the AUTOSET button is pushed

Touch Close to save your prompt selection.

TDS6000B & TDS6000C Series User Manual

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Acquiring Waveforms

NOTE. Autoset may change the vertical position to position the waveform appropriately. It sets vertical offset to 0 V unless an offsetable probe is attached. If you are not using an offsetable probe and your signal contains offset (such as the fast edge signal), you may need to adjust the Vertical Offset and SCALE to display the signal.

To Reset the Instrument

You may want to revert to the factory default setup; if so, reset the instrument:

Overview To reset the instrument Control elements and resources

Prerequisites

Execute

To Get More Help

1. The instrument is powered up and running.

See Powering On the Instrument on page 1--8.

2. Push the DEFAULT SETUP button.

You can get help on the vertical and acquisition controls by accessing online help:

Overview To get more help Control elements and resources

Prerequisites

3- 10

1. Instrument powered up and running.

See Powering On the Instrument on page 1--8.

TDS6000B & TDS6000C Series User Manual

Overview Control elements and resourcesTo get more help (Cont.)

Acquiring Waveforms

Access

vertical set up

help

Input Conditioning

2. Touch the Help button in toolbar mode or select Help on Window from the Help menu in menu bar mode.

3. You can also select topics related to the vertical controls from the online help Contents/Index/Find window: select Contents and Index in the Help menu, as shown at right.

This section contains background information that can help you more effectively

Background

set up the acquisition window of each channel.

Input. This instrument samples in real-time or random equivalent-time; both sampling methods provide pretrigger information by using the trigger to stop an already running acquisition. Both sampling methods also sample the input after it is scaled, providing improved input protection and dynamic range.

CAUTION. To prevent damage to the acquisition system, do not overdrive the inputs and observe static-safe procedures.

Autoset Considerations. Autoset acquires samples from the input signal and attempts to take the following actions based on the input data:

H Evaluate the amplitude range of the input signals and set the size and vertical

offset of the vertical acquisition window to acquire the signal with good resolution, but without clipping.

H Set the trigger to the approximate midlevel of the signal being autoset and

switches to edge trigger mode.

H Evaluate the signal transitions and set the horizontal scale to produce a

waveform display of 2 or 3 cycles of the input signal.

Sometimes Autoset cannot produce a correct display due to the nature of the input signal; if so, you may have to adjust the scale, trigger, and acquisition controls manually. Some conditions that can cause Autoset to fail are:

H No signal present

H Signals with extreme or variable duty cycles

TDS6000B & TDS6000C Series User Manual

3- 11

Acquiring Waveforms

H Signals with multiple or unstable signal periods

H Signals with too low amplitude

H No recognizable trigger signal

H Signals with a frequency <50 Hz

H Autoset can fail on signals greater than delayed triggering bandwidth

H Signals with a frequency above the bandwidth of the instrument

H Signals with high offset and low peak-to-peak variations

Vertical Acquisition Window Considerations. You can set the vertical size, position, and offset of each channel independently of other channels. Vertical scale and offset specify the vertical acquisition window for each channel. Parts of the signal amplitude that fall within the vertical window are acquired; parts outside (if any) are not.

The offset control subtracts a constant DC level from the input signal before the vertical scale factor is applied, and the vertical position control adds a constant number of divisions of signal after the scale factor is applied to the resulting difference.

The vertical scale and position controls have the following effects on the vertical acquisition window and the displayed waveform:

H The vertical volts per division that you set determines the vertical size of the

acquisition window, allowing you to scale it to contain all of a waveform amplitude or only part. Figure 3--2 on page 3--13 shows two vertical acquisition windows that contain the entire waveform, but only one window contains the entire waveform in the graticule on screen.

NOTE. Amplitude-related automatic measurements (for example, peak-to-peak and RMS) will be accurate for vertical windows like those shown in Figure 3--2a and b because neither waveform is clipped (that is, both waveforms are acquired). But if signal amplitude were to extend outside the vertical acquisition window, the data acquired is clipped. Clipped data causes inaccurate results if used in amplitude-related automatic measurements. Clipping also causes inaccurate amplitude values in waveforms that are stored or exported for use in other programs.If the digitizers are over driven, measurements may not be accurate. Readings of ?????? indicates the signal is clipped and the measurements ar e not accurate. To prevent shock, verify voltage levels before touching the circuit.

If the scale of a math waveform is changed so that the math waveform is clipped, it will not affect amplitude measurements on that math waveform.

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TDS6000B & TDS6000C Series User Manual

Acquiring Waveforms

H The vertical position adjusts the acquisition, and therefore the display, of the

acquired waveform relative to the vertical acquisition window. Figure 3--2b shows how vertical position moves the acquired waveform vertically in the acquisition window to place the acquired waveform in the graticule display.

H As you vary the vertical position, the vertical acquisition window moves up

and down (±5 divisions) on the waveform. With input signals that are smaller than the window, it appears the waveform moves in the window. Actually, the position moves the vertical acquisition window up and down on the input signal.

a. SCALE setting determines

the vertical acquisition window size; here 100 mV/div x 10 divisions (8 graticule divisions and 1 division of position)

b. Vertical offset and position

can change the location of the acquired waveform within the acquisition window, repositioning it so its waveform appears in the graticule

Verti cal

window

Channel

reference

indicator

Verti cal

window

Channel

reference

Indicator

+0.5 Volt +0.4 Volt

Graticule

--0.4 Volt

--0.5 Volt

+0.7 Volt +0.6 Volt

Graticule

--0.2 Volt

--0.3 Volt

Figure 3- 2: Setting vertical range and position of input channels

The vertical offset control affects the vertical acquisition window and the displayed waveform as follows:

H The vertical range (window) is always centered around the offset value. It is

the voltage level at the middle of the vertical acquisition window. With no (zero) offset, as shown in Figure 3--2 a and b, that voltage level is zero (ground).

H As you vary vertical offset, the middle voltage level moves relative to zero.

This moves the vertical acquisition window up and down on the waveform. With input signals that are smaller than the window, it appears the waveform moves in the window. Actually, a larger signal shows what really happens: the offset moves the middle of the vertical acquisition window up and down on the input signal. Figure 3--3 shows how offset moves the acquisition window to control the portion of the waveform amplitude the window captures.

TDS6000B & TDS6000C Series User Manual

3- 13

Acquiring Waveforms

H Applying a negative offset moves the vertical range down relative to the DC

level of the input signal. Likewise, applying a positive offset moves the vertical range up. See Figure 3--3.

VerticalWindow=100mV(8divsX10mV/div+(+/-1divsofposition))

Offset +300 mV

(Near waveform top level)

Offset 0.0 V

(At waveform ground reference)

Offset --300 mV

(Waveform bottom level)

Acquisition window shifts positive to capture overshoot

Acquisition window shifts negative to capture preshoot

3- 14

Figure 3- 3: Varying offset moves the vertical acquisition window on the waveform

Horizontal Acquisition Window Considerations. The instrument lets you define the

horizontal acquisition window, that is, set several parameters that determine the segment of an incoming signal that becomes the waveform record when acquired. (For background, read Waveform Record on page 3--30.) These common parameters specify a horizontal acquisition window that is applied to all channels in parallel. (See Independent vs. Shared Window on page 3--17.) These parameters are:

H The trigger condition that you set up determines the point on the waveform

that triggers the instrument.

H Horizontal position also determines the number of pretrigger and posttrigger

samples; samples before the reference point are pretrigger samples and those after the reference are posttrigger samples.

TDS6000B & TDS6000C Series User Manual

Acquiring Waveforms

H The Horizontal Delay that you set determines the time from the trigger point

to the Horizontal Reference.

H The horizontal scale and waveform record length (number of samples) that

you set determines the horizontal size of the window relative to any waveform, allowing you to scale it to contain a waveform edge, a cycle, or several cycles.

Sample interval

First sampled and

digitized point in record

Trigger point

Horizontal

Horizontal delay

Horizontal position

Horizontal reference

acquisition

window

Figure 3- 4: Horizontal Acquisition window definition

Horizontal Scale Versus Record Length Versus Sample Interval Versus Resolution.

These parameters all relate to each other and specify the horizontal acquisition window. Because the horizontal acquisition window must fit in the 10 horizontal division display, for most cases, you just set the duration of the horizontal acquisition window (10 divs x the scale setting) as described in (1) below. By also setting a record length in samples, you indirectly set the resolution/sample interval/sample rate for the horizontal acquisition window (waveform record). The relationships between these horizontal elements for 10 division waveforms follow:

1. Time Duration (seconds) = 10 divs (window size) x Horizontal scale (sec/div)

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Acquiring Waveforms

2. Time Duration (seconds) = Sample Interval (seconds/sample) x Record Length (samples),

where: Time Duration is the horizontal acquisition window time duration

and:

Sample Interval (sec/sample) = Resolution (sec/sample) = 1/Sample Rate (samples/sec)

In (2) above, note that it is Sample Interval that varies to accommodate the window time duration (and its scale setting) and the Record Length setting as these latter two elements can be set by you. These elements behave as follows:

H If Record Length or Time Duration vary, Sample Interval varies to accom-

modate, up to highest sample rate/lowest sample interval/highest resolution.

H If Sample Interval reaches its lower limit (fastest rate), Record Length must

decrease if T ime Duration decreases (you set faster scale settings), or Time Duration must increase (forcing slower scale settings) if Record Length increases (you set longer record lengths). The equation becomes:

Maximum Record Length = Time Duration ÷ Min Sample Interval

For example, at 50 ps/div and 10 divisions, the record length must be 500 points:

Max Rec Length = (10 divs x 50ps/div) ÷ 500 fs/sample‘

Max Rec Length = 500 samples

NOTE. As implied from the operation just described, resolution and the equivalent elements, sample interval and sample rate (see equation 2 above), cannot be set directly, but are derived. Y ou can, however , check the resolution at anytime in the resolution readout. Also note, that the Resolution control actually adjusts the record length to increase sample density.

The above discussion also assumes that horizontal scale is held constant. You can, however, choose to hold the sample rate constant instead, by selecting Hold Sample Rate Constant in the Utilities, User Preferences menu.

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Independent vs. Shared Window. The instrument applies the same horizontal acquisition window to all channels from which it acquires data. Unlike the vertical acquisition window that you size and offset independently for each channel, the same time/div, resolution (record length), and horizontal position (from the same trigger point) apply to all channels simultaneously. One trigger, from a single trigger source, will locate a common horizontal acquisition window for all active channels, which you can shift in parallel by setting the horizontal position control.

The horizontal acquisition window determines the waveform records extracted from all signals present at all active channels. You can think of the horizontal acquisition window as cutting across any input signals present in the input channels to extract the same slice of time into waveform records. See Figure 3--5.

Ch1 record

Common trigger

Figure 3- 5: Common trigger, record length, and acquisition rate for all channels

Setting Acquisition Controls

This section presents overviews of the instrument acquisition features—those that start and stop acquisitions and those that control how the instrument processes the data as it is acquired (just sampled, or averaged or enveloped). Special features, keys to using, and operation controls are covered.

Roll mode gives a strip chart recorder-like display for low frequency signals. Roll mode lets you see acquired data points without waiting for the acquisition of a complete waveform record. For example, in normal acquisition mode, when the Horizontal Scale is 1 second per division, 10 seconds are required to fill the waveform record. Without roll mode you must wait 10 seconds to see any waveform display. With roll mode you can start seeing results almost immediately.

Ch2 record

Ch3 record

Common horizontal

position and delay

Ch4 record

Common record start

point and record length

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Acquiring Waveforms

The following table indicates which acquisition features and modes are incompatible with other fe atur es or modes:

Control/Feature Incompatible with Explanation

Average Single acquisition Acquisitions continue until the

specified number of waveforms have been acquired and averaged

Envelope Single acquisition Acquisitions continue until the

specified number of waveforms have been acquired for the enveloped waveform

Roll Measurements Measurements are not

available until you stop acquisitions

Using the Acquisition

Controls

Consider the mode that you want to use to acquire data:

H Sample. The instrument does no postprocessing of acquired samples. The

instrument saves the first sample (of perhaps many) during each acquisition interval (an acquisition interval is the time covered by the waveform record divided by the record length.) Sample mode is the default mode.

H Peak Detect. The instrument stores both the lowest and highest samples over

a two-acquisition-interval period. This mode only works with real-time, noninterpolated sampling.

H Hi Res. The instrument creates a record point by averaging all samples taken

during an acquisition interval. Hi Res results in a higher-resolution, lower-bandwidth waveform. This mode only works with real-time, noninterpolated sampling.

A key advantage of Hi Res is its potential for increasing vertical resolution regardless of the input signal. Table 3--1 indicates that you can obtain up to 13 significant bits with Hi res mode. The instrument uses 16-bit memory. This is allocated as 15 bits + 1 sign bit. Round-off errors and internal noise limit the effective bits for Hi Res mode and signal averaging to about 13 bits. You can calculate the theoretical number of bits of enhancement using the following formula, where Nd is the number of samples taken during an acquisition interval:

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Bits of enhancement = 0.5 log2* Nd

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Table 3- 1: Additional resolution bits

Acquiring Waveforms

Theoretical en-

Sample Rate (S/s) Nd (extra samples)

5.00E+00 2.50E+08 13.95 13.00

1.00E+01 1.25E+08 13.45 13.00

2.50E+01 5.00E+07 12.79 13.00

5.00E+01 2.50E+07 12.29 13.00

1.00E+02 1.25E+07 11.79 13.00

2.50E+02 5.00E+06 11.13 13.00

5.00E+02 2.50E+06 10.63 13.00

1.00E+03 1.25E+06 10.13 13.00

2.50E+03 5.00E+05 9.47 13.00

5.00E+03 2.50E+05 8.97 13.00

1.00E+04 1.25E+05 8.47 13.00

2.50E+04 5.00E+04 7.80 13.00

5.00E+04 2.50E+04 7.30 13.00

1.00E+05 1.25E+04 6.80 12.80

2.50E+05 5.00E+03 6.14 12.14

5.00E+05 2.50E+03 5.64 11.64

1.00E+06 1.25E+03 5.14 11.14

2.50E+06 5.00E+02 4.48 10.48

5.00E+06 2.50E+02 3.98 9.98

1.00E+07 1.25E+02 3.48 9.48

2.50E+07 5.00E+01 2.82 8.82

5.00E+07 2.50E+01 2.32 8.32

1.00E+08 1.25E+01 1.82 7.82

2.50E+08 5.00E+00 1.16 7.16

5.00E+08 2.50E+00 0.66 6.66

1.25E+09 1.00E+00 0.00 6.00

hancement (bits)

Resulting resolution (in bits)

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Acquiring Waveforms

H Envelope. Continuously, as subsequent waveforms are acquired, the

instrument retains the running minimum (Min) and maximum (Max) values in adjacent sample intervals, creating an envelope of the number of waveforms that you specify. Once the specified number of waveforms is reached, the data is cleared and the process starts over. This is similar to the Peak Detect mode, but Envelope mode, unlike Peak Detect, gathers peaks over many trigger events. Works in only real time non-interpulated sampling.

H Average. The instrument processes the number of waveforms that you

specify into the acquired waveform, creating a running average of the input signal. This mode reduces random noise.

Acquiring and displaying a noisy square wave signal illustrates the difference among the modes. Note how Average reduces the noise while Envelope captures its extremes. Also notice Hi Res accuractely displays even rapidly changing waveforms while removing noise similar to averaging:

Sample

Envelope

AveragePeak Detect Hi Res

H Waveform Database. Using waveform database technology, the instrument

processes a much larger sample of data. The waveform database is a three-dimensional accumulation of source waveform data over several acquisitions. In addition to amplitude and timing information, the database includes a count of the number of times a specific waveform point (time and amplitude) has been acquired. The database is 200 lines by 500 columns with a 64 bit counter for each pixel location. You can use color-graded displays based on counts to highlight waveform activity. Parametric measurements derived from the database use statistical techniques to produce more stable, accurate results.

If you select Infinite Persistence, the counts accumulate continuously.

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Samples sets the minimum number of samples required to complete a single acquisition sequence and the minimum number of samples required to complete a mask test. If not using display persistence, samples sets the minimum number of samples that is required to release the waveform to the display. Similar to FastFrame, selecting RunStop, will cause the waveform to be displayed with what has been acquired so far.

The actual number of samples acquired is determined by the Samples setting, the selected Record Length, and if in equivalent time acquisitions, the actual number of samples acquired in an acquisition. For example, in real-time acquisition mode with the entire trace displayed, if the Record Length is set to 5000 points and Samples is set to 5001 points, then two acquisitions are required and 10000 points are acquired. If Samples is set to 5000 points, one acquisition is required and 5000 points are acquired. If Samples is set to 4999 points, one acquisition is required and 5000 points are acquired.

For Single Sequence and Mask Pass/Fail Testing, a sample is only counted if the sample would be displayed in the graticule area. In Single Sequence, all eligible samples in an acquisition are counted. In Mask Test, with infinite persistence on, all acquisitions acquired in a batch are counted. In nondisplay persistence, the minimum number of samples for the waveform may include multiple batches of acquisitions.

In ET mode, fewer samples are acquired per acquisition, but more acquisitions may be acquired in a batch. Samples divided by the Record Length roughly indicates the number of waveforms in a batch of acquisitions.

Batch processing minimizes the overhead of displaying and processing other features, such as measurements and histograms. The higher the number of samples, the greater the acquisition throughput and the potential for less frequent display updates.

Also, consider how you want to control acquisition; you have two main options, settable from the Run/Stop control window (select Run/Stop from the Horiz/Acq menu):

H Run/Stop Button Only. Sets the instrument to start and stop the acquisition

only when you push the Run/Stop button, available on the front panel, or in the Run/Stop control window. If toggled to Run, acquisition will start if a valid trigger occurs. If toggled to Stop, acquisition stops immediately.

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Acquiring Waveforms

H Single Sequence. In addition to the Run/Stop Button, which can always stop

an acquisition, the SINGLE button (or Single Sequence control) will automatically stop acquisition when one complete acquisition sequence is completed. See step 4, Set the stop mode, on page 3--24, or access the online help from the Run/Stop control window for more information.

Untriggered Roll. Untriggered roll mode displays newly acquired data points at the right edge of the waveform record while moving older waveform data points to the left. To stop acquiring data push RUN/STOP (see Figure 3--6).

Use untriggered roll to continuously observe a slow process, knowing that you can always see the most recent view of that process. Math and measurements work after you push STOP.

Untriggered Roll with Single Sequence. Untriggered roll mode with single sequence displays newly acquired data points at the right edge of the waveform record while moving older waveform data points to the left. Acquisitions automatically stop after a complete waveform record is acquired (see Figure 3--6). Use untriggered roll with single sequence to observe data for later viewing.

Untriggered roll

Old data

Untriggered roll with single sequence

Old data

Figure 3- 6: Roll mode

New data points New data points

Acquisitions start

New data points

Acquisitions start

Old data continues

Complete waveform record

Acquisitions continue

Acquisitions stop

Global Controls. Like the horizontal controls, the acquisition controls apply to all active channels; for example, channel 1 cannot acquire in Sample mode while channel 2 acquires in Envelope mode. You cannot stop channel 4 from acquiring (if turned on) while other channels continue to acquire.

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Preventing Aliasing. Under certain conditions, a waveform may be aliased on screen. Read the following description about aliasing and the suggestions for preventing it.

When a waveform aliases, it appears on screen with a frequency lower than the actual waveform being input or it appears unstable even though the TRIG’D light is lighted. Aliasing occurs because the instrument is not sampling the signal fast enough to construct an accurate waveform record. (See Figure 3--7.)

Actual high-frequency

waveform

Apparent low-frequency

waveform due to aliasing

Sampled points

Figure 3- 7: Aliasing

Methods to Check and Eliminate Aliasing. To quickly check for aliasing, slowly

decrease the horizontal scale (time per division setting). If the shape of the displayed waveform changes drastically or becomes stable at a faster time base setting, your waveform was probably aliased.

To avoid aliasing, be sure to sample the input signal at a rate more than twice as fast as the highest frequency component of the input signal. For example, a signal with frequency component of 500 MHz would need to be sampled at a rate faster than 1 Gigasamples/second to represent it accurately and to avoid aliasing. The following tips may help you eliminate aliasing on a signal:

H Turn on Waveform Database mode to capture more data.

H Try adjusting the horizontal scale for proper waveform display.

H Try pushing the AUTOSET button.

H Try switching the acquisition to Envelope mode. Envelope searches for

samples with the highest and lowest values over multiple acquisitions and can detect faster signal components over time.

H Turn on PeakDetect acquisition mode. If the waveform becomes an

envelope, aliasing was occurring.

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To Set Acquisition Modes

Use the procedure that follows to set the data acquisition mode and specify acquisition start/stop methods. For more information, display online help when performing the procedure.

Overview To set acquisition modes Control elements and resources

Prerequisites

To select an

acquisition

1. Instrument must be powered up, with horizontal and vertical controls set up. Triggering should also be set up.

See page 3--43 for trigger setup.

2. Touch the Horiz button. Select the Acquisition tab from the Horiz/Acq setup window.

mode

Select the

acquisition

mode

3. Touch an Acquisition Mode button to set the acquisition mode; choose from the following modes:

H Sample

H Peak Detect

Set waveform

count

(average and

envelope only)

Set the stop

mode

H Hi Res

H Envelope

H Average

H Waveform Database

For Average and Envelope modes only, select the number of acquisitions to average or envelope. For Waveform Database mode, select the number of samples desired.

4. Push the RUN/STOP button (or touch Run/Stop in the Run/Stop control window) to toggle between starting (Running) and stopping acquisitions.

5. Push the SINGLE button (or touch Single Sequence in the Run/Stop control window) to acquire enough waveforms to satisfy the acquisition mode and then stop.

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Overview Control elements and resourcesTo set acquisition modes (Cont.)

Acquiring Waveforms

To select

real-time or

equivalent-

time sampling

To select real-time sampling, interpolated real-time sampling, or equivalent-time sampling:

6. Touch the Horiz button. Select the Acquisition tab from the Horiz/Acq control window,

Or select Horizontal/Acquisition Setup from the Horiz/Acq menu to display the Acquisition Mode control window. Select the Acquisition tab.

7. Select the sampling mode:

H Equivalent Time uses both the real-time and

equivalent-time sampling as appropriate.

H Real Time Only limits the instrument to real-time

sampling. Real Time Only prevents the very fast horizontal scale settings from being selected.

H Interpolated Real Time limits the instrument to

real-time sampling. If the instrument cannot accurately get enough samples for a complete waveform, it will interpolate.

Note. The instrument will use the interpolation method selected in the display menu to fill in the missing record points — either linear or sin(x)/x interpolation. The default method is sin(x)/x. See Interpolation on page 3 --32 for a discussion of interpolation.

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Acquiring Waveforms

To Start and Stop

Use the procedure that follows to start and stop acquisition.

Acquisition

Overview To start and stop acquisition Control elements and resources

Prerequisites

To start

acquiring

To stop

acquiring

1. The horizontal and vertical controls must be set up. Triggering should also be set up.

See page 3--24 for acquisition setup and

page 3--43 for trigger setup.

2. Make sure all the channels to be acquired are turned on (use channel buttons; see To Set Up Signal Input on page 3--6 if needed). Then push the RUN button to begin acquiring.

3. Push the RUN/STOP button to stop acquisition. Acquisition will also stop if triggering ceases while in Normal trigger mode.

To take a

single

acquisition

For more help

3- 26

4. Push the SINGLE button to start acquiring and acquire enough waveforms to satisfy the acquisition mode and then stop.

5. See references listed at right.

See To Set Acquisition Modes on page 3--24 and To Get

More Help on page 3--10.

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Acquiring Waveforms

To Set Roll Mode

Overview To set Roll Mode Control elements and resources

Prerequisites

To enable roll

mode

1. The horizontal and vertical controls must be set up. Triggering should also be set up.

2. Touch the Horiz button. Select the Acquisition tab from the Horiz/Acq control window, or select Horizontal/Acquisition Setup from the Horiz/Acq menu to display the Acquisition Mode control window. Select the Acquisition tab.

3. Select Roll Mode AUTO to enable roll mode.

When the horizontal scale is 40 ms per division at a record length of 200K points and the acquisition mode is Sample or Pk Detect, roll mode turns on. As the record length becomes larger, the time per division required to enter roll mode becomes slower.

Use the procedure that follows to set up roll mode acquisitions.

See page 3--24 for acquisition setup and

page 3--43 for trigger setup.

To single

sequence roll

mode

To turn off roll

mode

acquisitions

Note. Envelope, Average, and Waveform Database acquisition modes inhibit roll mode.

4. Push the SINGLE button to start acquiring and acquire enough waveforms to satisfy the acquisition mode and then stop.

5. Do the following step to stop acquisitions in roll mode:

H If you are not in Single Sequence, push RUN/

STOP to stop roll mode.

H If you are in Single Sequence, roll mode acquisi-

tions stop automatically when a complete record is acquired.

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Acquiring Waveforms

Overview Control elements and resourcesTo set Roll Mode (Cont.)

To disable roll

mode

6. Touch the Horiz button. Select Acquisition tab from the Horiz/Acq control window,

Or select Horizontal/Acquisition Setup from the Horiz/Acq menu to display the Acquisition Mode control window. Select the Acquisition tab.

7. Select Roll Mode OFF to disable roll mode.

Or, whenever you set the Horizontal SCALE to 20 ms per division or faster, roll mode turns off. At record lengths greater than 200K points, the time per division required to turn off roll mode becomes slower.

Note. Envelope, Average, and Waveform Database acquisition modes inhibit roll mode.

Acquisition Control Background

This section contains background information on the data sampling and acquisition process that can help you more effectively set up the acquisition window of each channel. This section describes the following:

H The acquisition hardware

Acquisition Hardware

H The sampling process, sampling modes, and the waveform record

H Normal acquisition cycles

Before a signal can be acquired, it must pass through the input channel where it is scaled and digitized. Each channel has a dedicated input amplifier and digitizer as shown in Figure 3--8; each channel can produce a stream of digital data from which waveform records can be extracted. See Signal Connection and Condi- tioning on page 3--2 for further description of scaling, positioning, and DC offsetting of channels.

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Sampling Process

CH 1

CH 2

CH 3

CH 4

Digitizer

Figure 3- 8: Digitizer configuration

Acquisition is the process of sampling the analog input signal of an input channel, converting it into digital data, and assembling it into a waveform record, which is then stored in acquisition memory. Sampling, then, is the process that provides a waveform record per trigger event (see Figure 3--10 on page 3--30). The signal parts within the vertical range of the amplifier are digitized. See Figure 3--9.

Input signal Sampled points Digital values

Figure 3- 9: Digital acquisition — sampling and digitizing

Acquisition Modes

The instrument acquisition system can process the data as it is acquired, averaging or enveloping the waveform data to produce enhanced waveform records. Once the waveform record exists (enhanced or not), you can use the postprocessing capabilities of the instrument to further process that record: perform measurements, waveform math, and so on. Refer to Using the Acquisi- tion Controls on page 3--18 for a description of the acquisition modes.

TDS6000B & TDS6000C Series User Manual

+5.0 V

0V 0V 0V 0V

+5.0 V

-- 5 . 0 V

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Acquiring Waveforms

Waveform Record

While sampling on the input signal provides the data that makes up the waveform record for any given channel, the instrument builds the waveform record through use of some common parameters (common means that they affect the waveforms in all channels).

Figure 3--10 shows how these common parameters define the waveform record; as shown in the figure, they define where in the data stream and how much data is taken. Locate the following parameters in the figure:

H Sample Interval. The time between sample points taken during acquisition.

H Record Length. The number of samples required to fill a waveform record.

H Trigger Point. The trigger point marks the time zero in a waveform record.

All waveform samples are located in time with respect to the trigger point.

H Horizontal Position. If horizontal delay is off, the time lapse from the first

sample taken (first point in the waveform record) to the trigger point (in percent of samples before the trigger). When horizontal delay is off, the trigger point and the horizontal reference are at the same point in the waveform record.

Sample interval

First sampled and digitized

point in record

Trigger point

Horizontal delay

Horizontal position

Horizontal reference

Record length

Figure 3- 10: The waveform record and its defining parameters

As Figure 3--10 shows, the instrument acquires points in order from left to right.

When all the points in the waveform record have been sampled and digitized, the waveform record is in acquisition memory and becomes available for display (or use in math waveforms, storage, and so on).

For a control-oriented discussion of the waveform record, see Horizontal

Acquisition Window Considerations on page 3--14 and Horizontal Scale vs. Record Length vs. Sample Interval vs. Resolution on page 3--15.

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Acquiring Waveforms

Real-Time Sampling

Equivalent-Time Sampling

The two general methods of sampling are real-time and equivalent-time. This instrument uses both real- and equivalent-time sampling.

In real-time sampling, the instrument digitizes all the points it acquires after one trigger event (see Figure 3--11). Always use real-time sampling to capture single-shot or transient events.

Record points

Sampling rate

Figure 3- 11: Real-time sampling

The instrument uses equivalent time sampling to extend its sample rate beyond its real-time maximum sampling rate, but only under two conditions:

H You must have selected Equivalent Time in the Acquisition Setup control

window.

H You must have set the instrument that requires a faster sampleing rate than it

can support in real-time sampling mode.

If both conditions are met, the instrument takes a few samples with each trigger event and eventually obtains enough samples to construct a waveform record. The instrument makes multiple acquisitions of a repetitive waveform to obtain the sample density required for a waveform record. (See Figure 3--12.) Equivalent-time sampling should only be used on repetitive signals.

The sampling speeds affect the mode the instrument uses to sample waveforms:

H The instrument always real-time samples at slower time base settings; faster

time settings force the instrument to switch from real-time sampling to equivalent-time sampling or interpolation, depending on whether Equivalent Time or Interpolated Real Time is selected.

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Acquiring Waveforms

Record points

1st Acquisition cycle

2nd Acquisition cycle

3rd Acquisition cycle

nth Acquisition cycle

Figure 3- 12: Equivalent-time sampling

The type of equivalent-time sampling the instrument uses is called random equivalent-time sampling. Although it takes the samples sequentially in time, it takes them randomly with respect to the trigger. Random sampling occurs because the instrument sample clock runs asynchronously with respect to the input signal and the signal trigger. The instrument takes samples independently of the trigger position and displays them based on the time difference between the sample and the trigger.

Interpolation

IT (Interpolated Time) mode is the default setting for these scopes. IT is a real time sampling mode that interpolates points between sampled points to fill in the record length selected. It uses sin(x)/x interpolation as default method. IT mode offers the same 500fs/point resolution that ET can achieve, but it does it with a single trigger event instead of requiring multiple triggers.

Your instrument can interpolate between the samples it acquires. In equivalenttime sampling, it interpolates only when it does not have all the real samples it needs to fill its displayed waveform. When setting ZOOM to progressively larger amounts of expansion, the instrument then interpolates to create the intervening points in the displayed waveform. If the time per division is set fast enough to require equivalent time but equivalent time is disabled, the instrument interpolates points. There are two options for interpolation: Sin(x)/x or linear. (The instrument can also equivalent-time sample to acquire more samples; see Equivalent-Time Sampling on page 3--31.)

Sin(x)/x interpolation. Sin(x)/x interpolation computes record points using a curve fit between the actual values acquired. It assumes all the interpolated points fall along that curve. Sin(x)/x is particularly useful when acquiring more rounded waveforms such as sine waves. Actually, it is appropriate for general use, although it may introduce some overshoot or undershoot in signals with fast rise times, especially if you use zoom and the waveform edges are undersampled.

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Tektronix TDS6804B, TDS6604B, TDS6154C, TDS6124C User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty 2

Table of Contents

List of Figures

List of Tables

General Safety Summary

Environmental Considerations

Preface

About This Manual

Related Manuals and Online Documents

Product Description

Model Key Features

Product Software

Software Upgrade

Installation

Unpacking

Checking the Environment Requirements

Connecting Peripherals

Powering On the Instrument

Shutting Down the Instrument

Backing Up User Files

Installing Software

Removing the Removable Hard Drive

Reinstalling the Removable Hard Drive

Enabling or Disabling Your LAN and Connecting to a Network

Setting up a Dual Display

Incoming Inspection

Self Tests

Functional Tests

Perform the Extended Diagnostics

Operational Maps

Documentation Map

System Overview Maps

Functional Model Map

Process Overview Map

Front Panel I/O Map

Rear Panel I/O Map

Acquiring Waveforms

Signal Connection and Conditioning

Setting Acquisition Controls

Acquisition Control Background