Tektronix TDS7054 User manual

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User Manual
TDS7000 Series
Digital Phosphor Oscilloscopes
(TDS7104 & TDS7054)
071-0700-02
This document supports firmware version 1.00
and above.
www.tektronix.com

Copyright ©Tektronix, Inc. All rights reserved.
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, Inc., P.O. Box 500, Beaverton, OR 97077-0001
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
TekVISA, FastFrame, and VocalLink are registered trademarks of Tektronix, Inc.

WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If this product proves defective during its
warranty period, Tektronix, at its option, will either repair the defective product without charge for parts and labor,
or provide a replacement in exchange for the defective product.
This warranty applies only to products returned to the designated Tektronix depot or the Tektronix authorized
representative from which the product was originally purchased. For products returned to other locations,
Customer will be assessed an applicable service charge. The preceding limitation shall not apply within the
European Economic Area, where products may be returned for warranty service to the nearest designated service
depot regardless of the place of purchase.
In order to obtain service under this warranty, Customer must provide the applicable office of Tektronix or its
authorized representative with notice of the defect before the expiration of the warranty period and make suitable
arrangements for the performance of service. Customer shall be responsible for packaging and shipping the
defective product to the service center designated by Tektronix or its representative, with shipping charges
prepaid. Tektronix or its representative shall pay for the return of the product to Customer. Customer shall be
responsible for paying any associated taxes or duties.
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 consumables;
d) to repair a product that has been modified or integrated with other products when the effect of such
modification or integration increases the time or difficulty of servicing the product; or
e) to repair damage or malfunction resulting from failure to perform user maintenance and cleaning at the
frequency and as prescribed in the user manual (if applicable).
THE ABOVE WARRANTIES ARE GIVEN BY TEKTRONIX WITH RESPECT TO THIS 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.

TDS7104 and TDS7054 User Manual i
Table of Contents
General Safety Summary xi...................................
To Avoid Fire or Personal Injury xi.................................
Symbols and Terms xii...........................................
Preface xiii...................................................
About This Manual xiii...............................................
Related Manuals and Online Documents xiv..............................
Contacting Tektronix xv.............................................
Getting Started
Product Description 1--1........................................
Models 1--1........................................................
Key Features 1--1....................................................
Product Software 1--2................................................
Firmware Upgrade 1--3...............................................
Probes Supported 1--4................................................
Installation 1--5...............................................
Unpacking 1--5......................................................
Checking the Environment Requirements 1--6.............................
Connecting Peripherals 1--6............................................
Powering On the Oscilloscope 1--8......................................
Shutting Down the Oscilloscope 1--9....................................
Creating an Emergency Startup Disk 1--10.................................
Backing Up User Files 1--10............................................
Installing Software 1--11...............................................
Enabling Your LAN and Connecting to a Network 1--14......................
Setting up a Dual Display 1--14..........................................
Incoming Inspection 1--17.......................................
Assemble Equipment 1--17.............................................
Self Tests 1--17.......................................................
Functional Tests 1--18.................................................
Perform the Extended Diagnostics 1--26...................................
Accessories & Options 1--29......................................
Options 1--29........................................................
Accessories 1--30.....................................................
Operating Basics
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..............................

Table of Contents
ii TDS7104 and TDS7054 User Manual
Front Panel I/O Map 2--9.......................................
Rear Panel I/O Map 2--10.......................................
Reference
Overview 3--1.................................................
Acquiring Waveforms 3--3......................................
Signal Connection and Conditioning 3--4.................................
Connecting and Conditioning Your Signals 3--5........................
To Set Up Signal Input 3--8........................................
To Autoset the Oscilloscope 3--11....................................
To Reset the Oscilloscope 3--12......................................
To Get More Help 3--13............................................
Input Conditioning Background 3--13.................................
Setting Acquisition Controls 3--21.......................................
Using the Acquisition Controls 3--22..................................
To Set Acquisition Modes 3--27......................................
To Start & Stop Acquisition 3--29....................................
Acquisition Control Background 3--32....................................
Acquisition Hardware 3--32.........................................
Sampling Process 3--33.............................................
Sampling Modes 3--33.............................................
Waveform Record 3--34............................................
Real-time Sampling 3--35...........................................
Equivalent-time Sampling 3--35......................................
Interpolation 3--37................................................
Interleaving 3--37.................................................
Using Fast Acquisition Mode 3--38.......................................
Using Fast Acquisitions 3--39........................................
To Turn Fast Acquisitions On and Off 3--42............................
To Set Display Format 3--45.........................................
Using FastFrame 3--46.................................................
Using FastFrame Acquisitions 3--47..................................
To Set FastFrame Mode 3--48.......................................
Time Stamping Frames 3--49........................................
Triggering 3--53................................................
Triggering Concepts 3--54..............................................
The Trigger Event 3--54............................................
Trigger Sources 3--54..............................................
Trigger Types 3--55................................................
Trigger Modes 3--55...............................................
Trigger Holdoff 3--56..............................................
Trigger Coupling 3--57.............................................
Horizontal Position 3--57...........................................
Slope and Level 3--57..............................................
Delayed Trigger System 3--58.......................................
Triggering from the Front Panel 3--58.....................................
Access Procedures 3--58............................................
To Check Trigger Status 3--62.......................................
Additional Trigger Parameters 3--64......................................
Advanced Triggering 3--68.............................................

Table of Contents
TDS7104 and TDS7054 User Manual iii
To Trigger on a Glitch 3--73.........................................
To Trigger on a Runt Pulse 3--75.....................................
Trigger Based on Pulse Width 3--77...................................
To Trigger Based on Transition Time 3--79.............................
Trigger Based on Pulse Timeout 3--82.................................
Trigger on a Pattern 3--84...........................................
To Trigger on a State 3--87..........................................
To Trigger on Setup/Hold Time Violations 3--88.........................
Sequential Triggering 3--92.............................................
Using Sequential Triggering 3--92....................................
To Trigger on a Sequence 3--96......................................
Comm Triggering 3--99................................................
Displaying Waveforms 3--101......................................
Using the Waveform Display 3--102.......................................
Using the Display 3--103............................................
To Display Waveforms in the Main Graticule 3--107......................
Setting Zoom Controls 3--109............................................
Using with Waveforms 3--109........................................
To Zoom Waveforms 3--109..........................................
Customizing the Display 3--114..........................................
Using Display Controls 3--114........................................
Set Display Styles 3--117............................................
Customize Graticule & Waveforms 3--119..............................
Measuring Waveforms 3--121.....................................
Taking Automatic Measurements 3--122....................................
Using Automatic Measurements 3--124.................................
To Take Automatic Measurements 3--127...............................
To Localize a Measurement 3--130....................................
Taking Cursor Measurements 3--132.......................................
Using Cursors 3--133...............................................
To Set the Cursor Sources 3--136......................................
Taking Histograms 3--138...............................................
Using Histograms 3--139............................................
To Start and Reset Histogram Counting 3--140...........................
Histogram Measurements 3--141......................................
Optimizing Measurement Accuracy 3--141..................................
To Compensate the Oscilloscope 3--142................................
To Connect the Probe Calibration Fixture 3--143.........................
To Calibrate Probes 3--146...........................................
To Compensate Passive Probes 3--148..................................
To Deskew Channels 3--148..........................................
Serial Mask Testing (Option SM Only) 3--152...............................
Creating and Using Math Waveforms 3--153.........................
Defining Math Waveforms 3--154.........................................
Using Math 3--155.................................................
To Define a Math Waveform 3--160....................................
Operations on Math Waveforms 3--163.....................................
Using Math Waveforms 3--164........................................
To Use Math Waveforms 3--164.......................................
Defining Spectral Math Waveforms 3--168..................................

Table of Contents
iv TDS7104 and TDS7054 User Manual
Using Spectral Math Controls 3--169...................................
Recognizing Aliasing 3--190.........................................
To Select a Predefined Spectral Math Waveform 3--192....................
To Define a Spectral Math Waveform 3--193............................
Data Input/Output 3--205.........................................
Saving and Recalling a Setup 3--205.......................................
To Save Your Setup 3--208...........................................
To Recall Your Setup 3--211..........................................
Saving and Recalling Waveforms 3--213...................................
To Save Your Waveform 3--214.......................................
To Recall Your Waveform 3--218......................................
To Clear References 3--220..........................................
Exporting and Copying Waveforms 3--223..................................
To Export Your Waveform 3--224.....................................
To Use an Exported Waveform 3--232..................................
To Copy Your Waveform 3--234......................................
Printing Waveforms 3--238..............................................
To Print from Front Panel 3--238......................................
To Print from Menu Bar 3--238.......................................
To Set Up the Page 3--238...........................................
To Preview the Page 3--240..........................................
To Print Using Print Screen 3--241.....................................
To Date/Time Stamp Hardcopies 3--242................................
Remote Communication 3--243...........................................
Accessing Online Help 3--245......................................
How to Use Online Help 3--245..........................................
Appendices
Appendix A: Specifications A--1..................................
Product and Feature Description A--1....................................
Acquisition Features A--2..........................................
Signal Processing Features A--2.....................................
Display Features A--3.............................................
Measurement Features A--3.........................................
Trigger Features A--3..............................................
Convenience Features A--3.........................................
Specification Tables A--4..............................................
Appendix B: Automatic Measurements Supported B--1..............
Levels Used in Taking Amplitude, Timing, and Area Measurements B--4........
Levels Used in Taking Eye Measurements (Option SM Only) B--6.............
P Values B--6....................................................
T1 Values B--7...................................................
T2 Values B--7...................................................
DCD Values B--7.................................................
Appendix C: Cleaning C--1......................................
Exterior Cleaning C--1................................................
Flat Panel Display Cleaning C--1........................................
Appendix D: Menu Bar Commands D--1..........................
File Commands D--1..................................................
Edit Commands D--3.................................................

Table of Contents
TDS7104 and TDS7054 User Manual v
Vertical Commands D--3..............................................
Horizontal and Acquisition Commands D--4...............................
Trigger Commands D--5...............................................
Display Commands D--6...............................................
Cursors Commands D--8...............................................
Measure Commands D--9..............................................
Masks Commands (Option SM Only) D--10................................
Math Commands D--11.................................................
Utilities Commands D--11..............................................
Help Commands D--12.................................................
Glossary
Index

Table of Contents
vi TDS7104 and TDS7054 User Manual
List of Figures
Figure 1--1: Locations of peripheral connectors on rear panel 1--7.....
Figure 1--2: Line fuse and power cord connector locations,
rear panel 1--8.............................................
Figure 1--3: On/Standby switch location 1--9.......................
Figure 1--4: Drag area for Windows task bar 1--16...................
Figure 1--5: Universal test hookup for functional
tests -- CH 1 shown 1--19.....................................
Figure 1--6: Channel button location 1--20..........................
Figure1--7:Setupfortimebasetest 1--21...........................
Figure 1--8: Setup for trigger test 1--23.............................
Figure 1--9: Setup for the file system test 1--25.......................
Figure 3--1: Input & Acquisition Systems & Controls 3--4............
Figure 3--2: Setting vertical range and position of input channels 3--16..
Figure 3--3: Varying offset moves the vertical acquisition
window on the waveform 3--17................................
Figure 3--4: Horizontal Acquisition window definition 3--18...........
Figure 3--5: Common trigger, record length, and acquisition
rate for all channels 3--20.....................................
Figure 3--6: Roll mode 3--26......................................
Figure 3--7: Aliasing 3--27........................................
Figure 3--8: Digitizer configuration 3--33...........................
Figure 3--9: Digital acquisition — sampling and digitizing 3--33........
Figure 3--10: The waveform record and its defining parameters 3--34...
Figure 3--11: Real-time sampling 3--35.............................
Figure 3--12: Equivalent-time sampling 3--36.......................
Figure 3--13: Normal DSO and Fast Acquisition displays 3--40.........
Figure 3--14: Normal DSO Acquisition and Display mode
versus Fast Acquisition mode 3--41.............................
Figure 3--15: Fast Acquisition XY display 3--45......................
Figure 3--16: FastFrame 3--46....................................
Figure 3--17: FastFrame time stamp 3--51..........................
Figure 3--18: Triggered versus untriggered displays 3--54.............
Figure 3--19: Triggered versus untriggered displays 3--56.............
Figure 3--20: Holdoff adjustment can prevent false triggers 3--57.......
Figure 3--21: Slope and level controls help define the trigger 3--58......

Table of Contents
TDS7104 and TDS7054 User Manual vii
Figure 3--22: Example advanced trigger readout 3--68................
Figure 3--23: Violation zones for Setup/Hold triggering 3--72..........
Figure 3--24: Triggering on a Setup/Hold time violation 3--91..........
Figure 3--25: Triggering with Horizontal Delay off 3--93..............
Figure 3--26: Triggering with Horizontal Delay on 3--94..............
Figure 3--27: Trigger and Horizontal Delay summary 3--95............
Figure 3--28: Display elements 3--102...............................
Figure 3--29: Horizontal Position includes time to
Horizontal Reference 3--106....................................
Figure 3--30: Graticule, Cursor, and Automatic measurements 3--122....
Figure 3--31: Annotated display 3--123..............................
Figure 3--32: High/Low tracking methods 3--125......................
Figure 3--33: Reference-level calculation methods 3--126...............
Figure 3--34: Horizontal cursors measure amplitudes 3--133............
Figure 3--35: Components determining Time cursor readout
values 3--134................................................
Figure 3--36: Horizontal histogram view and measurement data 3--138...
Figure 3--37: Pass/Fail mask testing 3--152...........................
Figure 3--38: Spectral analysis of an impulse 3--154...................
Figure 3--39: Functional transformation of an acquired waveform 3--154.
Figure 3--40: Derivative math waveform 3--158.......................
Figure 3--41: Peak-peak amplitude measurement of a derivative
waveform 3--159.............................................
Figure 3--42: Duration and resolution control effects 3--170.............
Figure 3--43: Definition of gate parameters 3--171.....................
Figure 3--44: Affects of frequency domain control adjustments 3--173....
Figure 3--45: Effects of adjusting the reference level 3--174.............
Figure 3--46: Effects of adjusting the reference level offset
control 3--175................................................
Figure 3--47: Example of the effects of setting the phase
suppression threshold 3--177...................................
Figure 3--48: Windowing the time domain record 3--179...............
Figure 3--49: Example of scallop loss for a Hanning window
without zero fill 3--181........................................
Figure 3--50: Time and frequency graphs for the
Gaussian window 3--182......................................
Figure 3--51: Time and frequency domain graphs for the
Rectangular window 3--183....................................
Figure 3--52: Time and frequency graphs of the
Hamming window 3--184......................................

Table of Contents
viii TDS7104 and TDS7054 User Manual
Figure 3--53: Time and frequency graphs for the
Hanning window 3--185.......................................
Figure 3--54: Time and frequency graphs for the
Kaiser-Bessel window 3--186...................................
Figure 3--55: Time and frequency graphs of the
Blackman-Harris window 3--187...............................
Figure 3--56: Time and frequency domain graphs for the
Flattop2 window 3--188.......................................
Figure 3--57: Tek Exponential window in the time and the
frequency domains 3--189.....................................
Figure 3--58: How aliased frequencies appear in a
spectral waveform 3--191......................................
Figure 3--59: Auto-increment file name feature 3--207.................
Figure 3--60: Print window 3--238..................................
Figure 3--61: Hardcopy formats 3--239..............................
Figure 3--62: Page setup window 3--240.............................
Figure 3--63: Print preview window 3--241...........................
Figure B--1: Levels used to determine measurements B--5............
Figure B--2: Eye-diagram and optical values B--6...................

Table of Contents
TDS7104 and TDS7054 User Manual ix
List of Tables
Table 1--1: Recommended probe cross reference 1--4................
Table 1--2: Additional accessory connection information 1--8.........
Table 1--3: Line fuses 1--8......................................
Table 1--4: Standard accessories 1--30.............................
Table 1--5: Optional accessories 1--31..............................
Table 3--1: Additional resolution bits 3--23.........................
Table 3--2: Sampling mode selection 3--36..........................
Table 3--3: How interleaving affects sample rate 3--38................
Table 3--4: XY format pairs 3--46.................................
Table 3--5: Pattern and state logic 3--70............................
Table 3--6: Defining and displaying waveforms 3--104.................
Table 3--7: Operations performed based on the waveform type 3--104...
Table 3--8: Customizable display elements 3--114.....................
Table 3--9: Cursor functions (types) 3--132..........................
Table 3--10: Cursor units 3--135...................................
Table 3--11: Math expressions and the math waveforms
produced 3--156..............................................
Table 3--12: Spectral analyzer controls 3--169........................
Table 3--13: Window characteristics 3--180..........................
Table A--1: TDS7000 models A--1................................
Table A--2: Channel input and vertical specifications A--4...........
Table A--3: Horizontal and acquisition system specifications A--9.....
Table A--4: Trigger specifications A--13............................
Table A--5: Display specifications A--16............................
Table A--6: Input/output port specifications A--17...................
Table A--7: Data storage specifications A--19........................
Table A--8: Power source specifications A--19.......................
Table A--9: Mechanical specifications A--20.........................
Table A--10: Environmental specifications A--21.....................
Table A--11: Certifications and compliances A--22...................
Table B--1: Supported measurements and their definition B--1........
Table B--2: Supported mask measurements and their
definition (Option SM only) B--3.............................

Table of Contents
xTDS7104 and TDS7054 User Manual
Table D--1: File menu commands D--1............................
Table D--2: Edit menu commands D--3............................
Table D--3: Vertical menu commands D--3.........................
Table D--4: Horiz/Acq menu commands D--4.......................
Table D--5: Trig menu commands D--6............................
Table D--6: Display menu commands D--7.........................
Table D--7: Cursor menu commands D--8.........................
Table D--8: Measure menu commands D--9........................
Table D--9: Masks menu commands D--10..........................
Table D--10: Math menu commands D--11..........................
Table D--11: Utilities menu commands D--11........................
Table D--12: Help menu commands D--12..........................

TDS7104 and TDS7054 User Manual xi
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.
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.
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.
ToAvoidFireor
Personal Injury

General Safety Summary
xii TDS7104 and TDS7054 User Manual
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
WARNING
High Voltage
Protective Ground
(Earth) Terminal
Mains Disconnected
OFF (Power)
Mains Connected
ON (Power) Standby
Symbols and Terms

TDS7104 and TDS7054 User Manual xiii
Preface
This is the user manual for the oscilloscope. It covers the following information:
HDescribes the capabilities of the oscilloscope, how to install it and reinstall
its software
HExplains how to operate the oscilloscope: how to control acquisition of,
processing of, and input/output of information
HLists specifications and accessories of the oscilloscope
About This Manual
This manual is composed of the following chapters:
HGetting Started shows you how to configure and install your oscilloscope
and provides an incoming inspection procedure.
HOperating Basics uses maps to describe the various interfaces for controlling
the oscilloscope, including the front panel and the software user interface.
These maps provide overviews of the product and its functions from several
viewpoints.
HReference comprises an encyclopedia of topics (see Overview on page 3--1)
that describe the oscilloscope interface and features, and gives background
and basic information on how to use them. (The online help onboard the
oscilloscope application describes the interface, features, and their usage;
detailed descriptions of all programming commands are found in the
TDS7000 Series Programmer Online Guide manual.)
HAppendices provides additional information including the specifications,
measurements, and cleaning information.

Preface
xiv TDS7104 and TDS7054 User Manual
Related Manuals and Online Documents
This manual is part of a document set of standard-accessory manuals and online
documentation; this manual mainly focuses on installation, background, and user
information needed to use the product features. See the following list for other
documents supporting oscilloscope operation and service. (Manual part numbers
are listed in Accessories & Options on page 1--29.)
Manual Name Description
TDS7000 Series Online Help An online help system, integrated with the User Interface application that ships with this
product. The help is preinstalled in the oscilloscope.
TDS7000 Series ReferencesA quick reference to major features of the oscilloscope and how they operate
TDS7000 Series Programmer Online Guide An alphabetical listing of the programming commands and other information related to
controlling the oscilloscope over the GPIB1.
TDS7000 Series Service Manual Describes how to service the oscilloscope to the module level. This optional manual
must be ordered separately.
1 Located on the TDS7000 Series Product Software CD. See CD instructions for installation instructions.
For more information on how the product documentation relates to the
oscilloscope operating interfaces and features, see Documentation Map on
page 2--2.

Preface
TDS7104 and TDS7054 User Manual xv
Contacting Tektronix
Phone [phone]*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support Email: [e-mail]
1-800-833-9200, select option 3*
1-503-627-2400
6:00 a.m. -- 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.