Tektronix TDS3000C Series, TDS3012C, TDS3014C, TDS3032C, TDS3034C User Manual

...

Download

TDS3000C Series

ZZZ

Digital Phosphor Oscilloscopes

User Manual

*P071230803*

071-2308-03

TDS3000C Series

ZZZ

Digital Phosphor Oscilloscopes

User Manual

Issued: September 2009

REPRODUCTION AND DISTRIBUTION OF THIS TECHNICAL MANUAL IS AUTHORIZED FOR UNITED STATES OF AMERICA GOVERNMENT PURPOSES.

www.tektronix.com

071-2308-03

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Speciﬁcations and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

TEKPROBE, and TekSecure are registered trademarks of Tektronix, Inc.

DPX, WaveAlert, e*Scope, and OpenChoice are trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc. 14200 SW Karl Braun Drive P.O. Bo x 5 00 Beaverton, OR 97077 USA

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

In North America, call 1-800-833-9200. World w ide, vi s it www.tektronix.com to ﬁnd contacts in your area.

Warranty

Tektronix warrants that the product will be free from defects in materials and workmanship for a period of three (3) years from the date of original purchase from an authorized Tektronix distributor. If the 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. Batteries are excluded from this warran reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.

ty. Parts, modules and replacement products used by Tektronix for warranty work m ay be new or

In order to o 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, shipping charges prepaid, and with a copy of customer proof of purchase. 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 product

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate mainte resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been modiﬁed or integrated with other products when the effect of such modiﬁcation or integration increases the time or difﬁculty of servicing the product.

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

LIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

IMP 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.

btain service under this warranty, Customer must notify Tektronix of the defect before the expiration

s returned to any other locations.

nance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage

[W16 – 15AUG04]

Table of Contents

General Safety Summary ......................................................................................... iii

Compliance Information........................................................................................... v

EMC Compliance............................... .................................. ............................. v

Safety Compliance........................................................................................... vii

Environmental Considerations ...................... ................................ ........................ ix

Preface .............................................................................................................. xi

Getting Started . ... . ... ... . ... ... . ... . .. . ... . ... ... . ... ... . ... .... ... . ... ... . ... ... . ... . .. . ... . ... ... . ... ... . ... ... . . 1

Initial Setup... ... . ... ... . ... ... . ... ... . .. . ... ... . ... ... . ... ... . ... ... . ... ... . .. . ... . .. . ... . .. . ... ... . ... ... . ... . 1

Product and Feature Description ............................................................................. 5

Operating Positions............................................................................................ 8

Connecting Power .............. ................................ .................................. ............. 9

Installing an Application Module ... ... . ... ... . ... ... . ... . .. . ... . ... ... . ... ... . ... .... ... . ... ... . ... ... . ... . 13

Installing the Communication Module . ... . ... ... . ... .... ... . ... ... . ... ... . ... . .. . ... . ... ... . ... ... . ... ... . 13

Front-Panel Menus and Controls............................................................................ 15

Front-Panel Connectors .................... .................................. ................................ 23

Rear-Panel Connectors....................................................................................... 24

Communication Module Connectors ..................... ................................ .................. 24

plication Examples................................... .................................. ........................ 27

Taking Simple Measurements ............................................................................... 27

Analyzing Signal Detail...................................................................................... 33

Taking FFT Measurements .. ................................ ................................ ................ 39

Triggering on a Video Signal.................. .................................. ............................ 41

Capturing a Single-Shot Signal ..... ................................ .................................. ...... 43

Saving Data to a USB Flash Drive.......................................................................... 46

Reference................. ................................ ................................ .......................... 51

Acquisition Controls.. ... . ... ... . ... ... . ... . .. . ... . ... ... . ... ... . ... ... . ... ... . ... ... . ... . .. . ... . ... ... . ... ... 51

Cursor .... .................................. ................................ ................................ .... 59

Display..................... ................................ .................................. .................. 63

Hard Copy ..................................................................................................... 65

Horizontal Controls........................................................................................... 67

Math and FFT ................................................................................................. 72

Measure........................................................................................................ 79

QuickMenu .................................................................................................... 84

Save/Recall .................................................................................................... 84

Trigger Controls............................................................................................... 90

Utility .... ... . .. . ... . .. . ... . .. . ... ... . ... ... . ... ... . ... ... . ... ... . ... ... . ... ... . .. . ... . ... ... . .. . ... ... . ... ... 109

Vertical Controls .............................. .................................. ............................ 114

e*Scope Web-Based Remote Control ........................ .................................. .......... 118

TDS3000C Series Oscilloscope User Manual i

Table of Contents

Appendix A: Spe

Appendix B: Factory Setup..................................................................................... 131

Appendix C: Accessories ......... .................................. ................................ ............ 135

Appendix D: Probe Basics.......................... ................................ ............................ 139

Probe Descriptions.............................. .................................. .......................... 139

Probe Compensation........................................................................................ 139

TekProbe In

Probe Guard ................................................................................................. 140

Ground Leads ............................................................................................... 140

P3010 High-Frequency Compensation..................... .................................. ............ 142

P3010 Replaceable Parts and Accessories ............................................................... 143

P6139A Replaceable Parts and Accessories ..................... ................................ ........ 144

Using Ot

Supported Active Probes and Adapters ...... .................................. .......................... 145

Unsupported Probes ........................................................................................ 146

Appendix E: General Care and Cleaning ..................................................................... 147

Appendix F: Ethernet Setup .................................................................................... 149

Your Ethernet Network Information ...................................................................... 149

ring the Ethernet Network Settings.......................................... ........................ 150

Ente

Entering the Network Printer Settings................ ................................ .................... 151

Testing Your Ethernet Connection ........................................................................ 151

Troubleshooting Your Ethernet Connection ............. ................................ ................ 152

The Instrument Setup Screen............ ................................ .................................. 153

The Printer Conﬁguration Screen ............................. ................................ ............ 154

e Add Printer Screen ............ .................................. ................................ ...... 155

Ethernet Error Messages ............................... ................................ .................... 156

Ethernet Settings Form .. . .. . ... ... . ... ... . ... ... . .. . ... ... . .. . ... ... . ... ... . ... ... . .. . ... ... . .. . ... ... . ... . 157

Index

ciﬁcations .......... ................................ .................................. ........ 121

terface........................ .................................. ................................ 140

her Probes. .................................. ................................ ...................... 145

ii TDS3000C Series Oscilloscope 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.

To Avoid Fire or Personal

Injury

Use Proper Power Cord. Use only the power cord speciﬁed for this product and

certiﬁed f

Connect and Disconnect Properly. Connect the probe output to the measurement instrume probe reference lead to the circuit under test before connecting the probe input. Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probe from the measurement instrument.

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 a v o id ﬁre or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings info

Connect the probe reference lead to earth ground only.

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

Do Not Operate With Suspected Failures. If you suspect that there is damage to this product, have it inspected by qualiﬁed service personnel.

or the country of use.

nt before connecting the probe to the circuit under test. Connect the

rmation before making connections to the product.

Avoid Exposed Circuitry. Do not touch exposed connections and components when power is present.

Replace Batteries Properly. Replace batteries only with the speciﬁed type and rating.

Recharge Batteries Properly. Recharge batteries for the recommended charge cycle only.

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.

TDS3000C Series Oscilloscope User Manual iii

General Safety Summary

TermsinthisManual

Symbols and Terms on the

Product

These terms may

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.

These terms may appear on the product:

DANGER in the marking.

WAR NI NG read the marking.

CAUTIO

The following symbol(s) may appear on the product:

appear in this manual:

dicates an injury hazard immediately accessible as you read

indicates an injury ha zard not immediately accessible as you

N indicates a hazard to property including the product.

iv TDS3000C Series Oscilloscope User Manual

Compliance Information

This section lists the EMC (electromagnetic compliance), safety, and environmental standards with which the instrument complies.

EMC Compliance

EC Declaration of Conformity – EMC

Meets intent of Directive 2004/108/EC for Electromagnetic Compatibility. Compliance was demonstrated to the following speciﬁcations as listed in the Ofﬁcial Journal of the European Communities:

EN 61326-1:2006, EN 61326-2-1:2006. EMC requirements for electrical equipment for measurement, control, and laboratory use.

123

CISPR 11:2003. Radiated and conducted emissions, Group 1, Class A

IEC 61000-4-2:2001. Electrostatic discharge immunity

IEC 61000-4-3:2002. RF electromagnetic ﬁeld immunity

IEC 61000-4-4:2004. Electrical fast transient/burst immunity

IEC 61000-4-5:2001. Power line surge immunity

IEC 61000-4-6:2003. Conducted RF immunity

IEC 61000-4-11:2004. Voltage dips and interruptions immunity

EN 61000-3-2:2006. AC power line harmonic emissions

EN 61000-3-3:1995. Voltage changes, ﬂuctuations, and ﬂicker

European Contact.

Tektronix UK, Ltd. Western Peninsula Western Ro ad Bracknell, RG12 1RF United Kingdom

This product is intended for use in nonresidential areas only. Use in residential areas may cause electromagnetic interference.

Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object.

To ensure compliance with the EMC standards listed here, high quality shielded interface cables should be used.

Theincreaseintracenoisewhilesubjectedtoatestﬁeld(3V/moverthefrequencyrange80MHzto1GHz,

1.4GHzto2.0GHzand1V/mfrom2.0GHzto2.7GHz,with8 exceed 8 major divisions peak-to-peak. Ambient conducted ﬁeld may induce triggering when the trigger threshold is offset less than 4 major divisions from ground reference for the IEC 61000-4-3 test.

Theincreaseintracenoisewhilesubjectedtoatestﬁeld (3 V/rms over the frequency range 150 kHz to 80 MHz, with 80% amplitude modulation at 1 kHz) is not to exceed 2 major divisions peak-to-peak. Ambient conducted

0% amplitude modulation at 1 kHz) is not to

TDS3000C Series Oscilloscope User Manual v

Compliance Information

Australia / New Zealand

Declaration

Conformity – EMC

ﬁeld may induce the IEC 61000-4-6 test.

Performance C levels (IEC 61000-4-11).

triggering when the trigger threshold is offset less than 1 major division from ground reference for

riterion C a pplied at the 70%/25 cycle Voltage-Dip and the 0%/250 cycle Voltage-Interruption test

Complies with the EMC provision of the Radiocommunications Act per the following st

andard, in accordance with ACMA:

CISPR 11:2003. Radiated and Conducted Emissions, Group 1, Class A, in accordance

with EN 61326-1:2006 and EN 61326-2-1:2006.

vi TDS3000C Series Oscilloscope User Manual

Compliance Information

Safety Compli

ance

EC Declaration of

Conformity – Low Voltage

U.S. Natio

nally Recognized

Testing Laboratory Listing

Canadian Certiﬁcation

Additional Compliances

Compliance was demonstrated to the following speciﬁcation as listed in the Ofﬁcial Journal of the European Communities:

Low Voltage Directive 2006/95/EC.

EN 61010-1: 2001. Safety requirements for electrical equipment for measurement control and laboratory use.

UL61010B-1:2003, First Edition, Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use.

CAN/CSA C22.2 No. 1010.1-92 - Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use. CAN/CSA C22.2 No. 1010.1B 97 - Amendment 2 to CAN/CSA C22.2 No. 1010.1-92

- Safety Requirements for Electrical Equipment for Measurement, Control, and Lab

IEC 61010-1: 2001. Safety requirements for electrical equipment for measurement, control, and laboratory use.

oratory Use.

ment Type

Equip

Safety Class

Pollution Degree

ription

Desc

Test and measuring equipment.

Class1–groundedproduct.

A measure of the contaminants that could occur in the environment around

within a product. Typically the internal environment inside a product is

and considered to be the same as the external. Products should be used only in the environment for which they are rated.

Pollution Degree 1. No pollution or only dry, nonconductive pollution occurs. Products in this category are generally encapsulated, hermetically sealed, or located in clean rooms.

Pollution Degree 2. Normally only dry, nonconductive pollution occurs. Occasionally a temporary conductivity that is caused by condensation must be expected. This location is a typical ofﬁce/home environment. Temporary condensation occurs only when the product is out of service.

Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes conductive due to condensation. These are sheltered locations

TDS3000C Series Oscilloscope User Manual vii

Compliance Information

Pollution Degree

Installation (Overvoltage)

Category Descriptions

where neither t from direct sunshine, rain, or direct wind.

Pollution Deg conductive dust, rain, or snow. Typical outdoor locations.

Pollution Degree 2 (as deﬁned in IEC 61010-1). Note: Rated for indoor use only.

Term inals o designations. The installation categories are:

Measureme low-voltage installation.

Measurem installation.

Measure connected to the low-voltage installation.

Measur directly connected to MAINS.

n this product may have different installation (overvoltage) category

ement Cate gory I. For measurements performed on circuits not

emperature nor humidity is controlled. The area is protected

ree 4. Pollution that generates persistent conductivity through

nt Category IV. For measurements performed at the source of

ent Category III. For measurements performed in the building

ment Category II. For measurements performed on circuits directly

Overvoltage Category

Overvoltage Category II (as d eﬁned in IEC 61010-1).

viii TDS3000C Series Oscilloscope User Manual

Compliance Information

Environmenta

Product End-of-Life

l Considerations

This section provides information a bout the environmental impact of the product.

Observe the following guidelines when recycling an instrument or component:

Handling

Equipment Recycling. Production of this equipment required the extraction and

use of natural resources. The equipment may contain substances that could be harmful to 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 ma t erials are reused or recycled appropriately.

y Recycling. This product might contain an optional lithium ion (Li-ion)

Batter

rechargeable battery, which must be recycled or disposed of properly.

the environment or human health if improperly handled at the product’s

This sym Union requirements according to Directives 2002/96/EC and 2006/66/EC on waste electrical and electronic equipment (WEEE) and batteries. For informa Tektronix Web site (www.tektronix.com).

bol indicates that this product complies with the applicable European

tion about recycling options, check the Support/Service section of the

Transporting Batteries

um-Ion batteries are subject to disposal and recycling regulations that

Lithi vary by country and region. Always check and follow your applicable regulations before disposing of any battery. Contact Rechargeable Battery Recycling Corporation (www.rbrc.org) for U.S.A. and Canada, or your local battery recycling organization.

Many countries prohibit the disposal of waste electronic equipment in standard waste receptacles.

Place only discharged batteries in a battery collection container. Use electrical tape or other approved covering over the battery connection points to prevent short circuits.

Mercury Notiﬁcation. This product uses an LCD backlight lamp that contains mercury. Disposal may be regulat ed due to environmental considerations. Please contact your local authorities or, within the United States, refer to the E-cycling Central Web page (www.eiae.org) for disposal or recycling information.

The capacity of the optional lithium ion rechargeable battery pack in this product is under 100 Wh. The lithium-equivalent content, as deﬁnedbytheUNManual of Tests and Criteria Part III Section 38.3, is under 8 g per pack and 1.5 g per individual cell.

TDS3000C Series Oscilloscope User Manual ix

Compliance Information

Restriction of Hazardous

Substances

Always check al before transporting a Lithium-Ion battery.

Transporting cases, be speciﬁcally limited or prohibited.

This product has been classiﬁed as Monitoring and Control equipment, and is outside the

scope of the 2002/95/EC RoHS Directive.

l applicable local, national, and international regulations

an end-of-life, damaged, or recalled battery may, in certain

x TDS3000C Series Oscilloscope User Manual

Preface

This manual contains operating information for the TDS3000C Series Digital Storage Oscilloscopes. The manual consists of the following chapters:

The Getting Started chapter brieﬂy describes features of the oscilloscope and provides installation instructions.

The Application Examples chapter provides examples on how to solve a variety of measurement problems.

The Reference chapter describes the selections or available range of values for each option.

The Appendix A: Speciﬁcations chapter includes electrical, environmental, and physical speciﬁcations for the oscilloscope, as well as certiﬁcations and complia

The Appendix B: Factory Setup chapter contains a list of the menus and contro the Save/Recall front-panel button, and then the Recall Factory Setup screen button.

The Appendix C: Accessories chapter brieﬂy describes standard and optional accessories.

nces.

ls with the default settings that the oscilloscope recalls when you push

The Appendix D: Probe Basics chapter provides basic information o n the P3010 and the P6139A probes, and on other probes.

The Appendix E: Cleaning chapter describes h ow to take care of the oscilloscope.

The Appendix F: Ethernet Setup chapter describes how to set up t he oscilloscope for printing through the network, and remote programming.

TDS3000C Series Oscilloscope User Manual xi

Preface

Preventing Ele

ctrostatic

Damage

CAUTION. Electrostatic discharge (ESD) can damage components in the

oscilloscop when directed to do so.

Use a Ground Strap. Wear a grounded, antistatic wrist strap to discharge the static voltage from your body while installing or removing sensitive components.

UseaSafeW

static charge in the work area where you install or remove sensitive components. Avoid handling sensitive components in areas that have a ﬂoor or benchtop surface capable of generating a static charge.

Handle Components Safely. Do not slide sensitive components over any surface. Do not t possible.

Transport and Store Carefully. Transport and store sensitive components in a static-protected bag or container.

e and its accessories. To prevent, ESD, observe these precautions

ork Area. Do not use any devices capable of generating or holding a

ouch exposed connector pins. Handle sensitive components as little as

xii TDS3000C Series Oscilloscope User Manual

Preface

Firmware Updates Through

the Internet

If a newer versi USB ﬂash drive to update your oscilloscope.

To update the ﬁ

1. From your c omputer, access the www.tektronix.com Web site and c heck if a newer version of oscilloscope ﬁrmware is available.

If there is a newer version of ﬁrmware, download the ﬁrmware ﬁle from the web page. Unzip and copy the tds3000c.img ﬁle into the root folder of a USB ﬂash dr

2. Power off your oscilloscope.

3. Insert the USB ﬂash drive into the ﬂash drive port on the front of the

oscilloscope.

4. Power on your oscilloscope.

5. When prompted, push the OK Load New Firmware menu button to start

the ﬁrmware load process.

NOTE. Do not power off the oscilloscope or remove the USB ﬂash drive until the

loscope ﬁnishes installing the ﬁrmware.

oscil

on of ﬁrmware becomes available, you can use the Internet and a

rmware, follow these steps:

ive.

6. Wait for the oscilloscope to reboot itself.

7. When prompted, remove the USB ﬂash drive.

8. Push the Utility front-panel button.

9. Push the Version bottom button. The oscilloscope displays the ﬁrmware

version n umber.

10. Conﬁrm that the version number matches that of the new ﬁrmware.

TDS3000C Series Oscilloscope User Manual xiii

Preface

xiv TDS3000C Series Oscilloscope User Manual

Getting Started

Initial Setup

In addition to a product and feature description, this chapter covers the following topics:

How to perform a quick functional check, install and compensate passive probes, compensate the signal path, and set the time and date

How to install the power cord, battery pack, and operate the oscilloscope safely with battery power

How to install application modules and the communication module

How to use the menu system

How to identify the oscilloscope controls and connectors

The following procedures describe how to quickly verify that the oscilloscope is powering up and functioning correctly, compensate passive probes using the built-in compensation signal, run the signal path compensation (SPC) routine for maximum signal accuracy, and set the time and date.

You should perform all initial setup procedures the ﬁrsttimeyouusethe oscilloscope.

You should perform the probe compensation procedure whenever you attach a passive probe for the ﬁrst time to any input channel.

You should run the signal path compensation routine whenever the ambient temperature changes by 10 °C (18 °F) or more.

TDS3000C Series Oscilloscope User Manual 1

Getting Started

Functional Check

Perform this qu

ick functional check to verify that your oscilloscope is operating

correctly.

1. Connect the oscilloscope power cable. (See page 9.)

2. Power on the oscilloscope.

Wait for the conﬁrmation that all self tests have passed.

3. Connect the oscilloscope probe to channel

1. Attach the probe tip and reference lead to the Probe Comp connectors.

Probe Comp

4. Push the Autoset button. You should see a square wave in the display (approximately 5Vat1kHz).

2 TDS3000C Series Oscilloscope User Manual

Getting Started

Probe Compensation

Perform this ad

justment to match your probe to the input channel. This should be

done whenever you attach a passive probe for the ﬁrst time to any input channel.

1. Connect the oscilloscope probe to channel

1. Attach the probe tip and reference lead to the Probe Comp connectors, then push Autoset.

If using the probe hook-tip, ensure a proper connection by ﬁrmly twisting the tip onto the probe.

2. Check the shape of the displayed waveform.

3. If necessary, adjust your probe.

Probe Comp

Over compensated

Under compensated

Compensated correctly

Autoset button

NOTE. See Appendix D: Probe Basics for more information about the probes

provided with your oscilloscope.

TDS3000C Series Oscilloscope User Manual 3

Getting Started

Signal Path Compensation

(SPC)

Adjust

ing the Oscilloscope

Time and Date

The SPC routine measurement accuracy. You can run the routine anytime but you should always run the routine if the ambient temperature changes by 10 °C (18 °F) or more.

To compensate the signal path, follow these steps:

1. Disconnect

2. Push the Utility button.

3. Push the System screen button to select Cal.

4. Push the Signal Path screen button.

5. Push OK Compensate Signal Path. This procedure takes several minutes

to complete.

NOTE. The signal path compensation does not include calibration to the probe tip.

To set your oscilloscope to the current date and time, follow these steps:

1. Push the Utility button.

2. Push the System bottom button to select Conﬁ g.

optimizes the oscilloscope signal path for maximum

any probes or cables from the channel input connectors.

3. Push t

4. Push

he Set Date & Time bottom button. Use the side menu buttons to

set the date and time values.

the OK Enter Date/Time side button to set the oscilloscope date and

time.

4 TDS3000C Series Oscilloscope User Manual

Product and Feature Description

The TDS3000C series oscilloscopes consist of the following models:

Model Channels Bandwidth Maximum

TDS3012C

TDS3014C

TDS3032C

TDS3034C

TDS3052C

TDS3054C

2 100 MHz

4 100 MHz

2 300 MHz

4 300 MHz

2 500 MHz

4 500 MHz

Getting Started

1.25 GS/s

2.5 GS/s

5GS/s

Acquisition Features

WaveAlert Waveform Anomaly Detection. This feature automatically detects

anomalous waveforms by comparing the current waveform to the previous waveform. WaveAler

t sets how the oscilloscope responds: stop on anomaly, beep on anomaly, and save anomalous waveform to a USB ﬂash drive. It’s useful for capturing signal glitches and intermittent waveform errors. (See page 59.)

Separate Digitizers. This feature ensures accurate timing measurements with separate digitizers for each channel. Each digitizer can sample at up to the maximum sample rate; the acquisition on all channels is always concurrent to provide full single-shot bandwidth on each channel.

Normal Acquisition. This feature acquires 10,000 point waveforms to capture horizontal detail, and then you can use the zoom

function to analyze the

detail. (See page 57.)

Fast Trigger Acquisition. This feature acquires u p to 3,400 waveforms per second (500 point mode) so you can see rapidly changing signals or intermittent si

gnal

irregularities. (Seepage57.)

Pretrigger. You can capture signals that o ccur before the trigger point. You can position the trigger point at the beginning of the acquisition, at the end, or at any location in between. (See page 67.)

Delay. You can also delay the acquisition so that it starts after the trigger point. Use delay when you want to acquire the signal at a speciﬁc time after the trigger point. (See page 68.)

Peak Detect. This feature allows you to see pulses as narrow as 1 ns even at the slower time base settings. Peak Detect helps you see noise and glitches in your signal. (Seepage55.)

Signal Processing

Features

Average. You can apply averaging to your signal to remove uncorrelated noise

and improve measurement accuracy. (See page 56.)

TDS3000C Series Oscilloscope User Manual 5

Getting Started

Display Features

Envelope. You c

a signal. (See page 56.)

Waveform Math. You can use waveform math to add, subtract, multiply, or divide waveforms. For example, you can use math to analyze differential signals or to calculate a power waveform. (See page 72.)

FFT Analysis. You can use FFT (Fast Fourier Transform) measurements to convert a time-domain signal into its frequency components for analysis. (See page 73.)

Color LCD Display. You can identify a nd differentiate waveforms easily with color coding. Waveforms, readouts, and buttons are color matched to increase productivity and reduce operating errors. (See page 64.)

Digital Phosphor. A Digital Phosphor Oscilloscope can clearly display intensity modulation in y our signals. The oscilloscope automatically overlays subsequent acquisitions and then decays them to simulate the writing and decay of the phosphor in the CRT of an analog oscilloscope. This feature results in an intensity-graded waveform display that shows the information contained in the intensity modulation. (See page 53.)

Signal Preview. You can use the preview feature to optimize the control settings when setting up a single-shot acquisition. As you adjust the controls, the adjustments modify the current acquisition to show a preview of how the next acquisition should appear. (See page 54.)

an use envelope to capture and display the maximum variation of

Measurement Features

Trigger Features

Cursors. You can use cursors to take simple voltage, time, and frequency

measurements. (See page 59.)

Automatic Measurements. You can choose from a list of au measurements. (See page 82.) You can customize the measurements by changing reference levels or by adding measurement gating. (See page 79.)

XY Waveform Cursors. You can use cursors to take measurements on XY waveforms. (See page 62.)

Dual Triggers. You can use the main (A) trigger system alone or add the B trigger to capture more complex events. You can also use the A and B triggers together to set up a wait-for-time or wait-for-events trigger. (See page 92.)

Logic Triggers. You can trigger on a Boolean condition between two signals. You can use logic triggers to analyze problems in digital circuits, or synchronous state machines. (See page 97.)

Pulse Triggers. You can trigger on a signal that meets a timing or threshold condition. You can use pulse triggers to analyze problems in digital circuits, with

tomatic waveform

6 TDS3000C Series Oscilloscope User Manual

Getting Started

Convenience Features

bus contention (See page 102.)

Video Trigger. You can trigger on video ﬁelds or lines to see a stable display of standard video signals. (See page 107.)

Alternatin

source, from the lowest-numbered active channel to the highest-numbered active channel. (See page 96.)

Built-In External Trigger. All models have an external trigger input. Four-channel models have the external trigger connector on the back of the oscilloscope. Two-chan

e*Scope Web-based Remote Control. You can access your TDS3000C oscilloscope through the Internet, from across a room to across the world. (See page 118.)

Built-in Ethernet. You can connect your TDS3000C oscilloscope to a network

Internet using the built-in 10BaseT Ethernet port, for e*Scope access or

or the printing screen images to network printers. (See page 149.)

Autoset. You can use Autoset to quickly set up the vertical, horizontal, and trigger controls for a usable display. (See page 52.)

, or in bus transceivers, transmission lines, and op-amp circuits.

g Trigger. You can sequentially use each active channel as a trigger

nel models have the external trigger connector on the front panel.

pe QuickMenu. You can use the built-in Scope QuickMenu for simpliﬁed

Sco

oscilloscope operation. (See page 21.)

Single Sequence. One button sets the trigger parameters to the correct settings for a single-shot acquisition (or single-sequence acquisition). (See page 51.)

SB Flash Drive Port. YoucanuseaUSBﬂash drive to store and recall

waveforms and setups, as well as upgrade the oscilloscope ﬁrmware and install new features. (See page 86.)

Probe Support. You can use the standard probes or choose an optional probe for aspeciﬁc application. Appendix D provides information and limitations. (See page 139.)

Multilingual User Interface. On-screen menus and messages are in 11 languages. (See page 109.)

TDS3000C Series Oscilloscope User Manual 7

Getting Started

Optional Feat

ures

Operating Positions

Application Mo

measurement features. (See page 135.)

Communication Module. You can install the communication module to add RS-232, GPIB, and VGA ports for remote programmability, or to display the oscilloscope screen on a monitor. (See page 13.)

Battery Power. You can install a rechargeable Lithium-Ion battery pack (TDS3BATC) to use the oscilloscope without line power. (See page 9.)

Use the handle and feet to place the oscilloscope in a convenient operating position.

dules. You can install application modules to add new test and

8 TDS3000C Series Oscilloscope User Manual

Getting Started

Connecting Po

Using Battery Power

wer

You can operate the oscilloscope from a mains supply with line voltage between 90 V is grounded t and is not operator replaceable.

You can operate the oscilloscope continuously for approximately three hours from the option

power is connected, and a gauge icon The oscilloscope turns off automatically when the battery runs low; the screen may turn white a few minutes before the automatic shutdown.

Refer to the Environmental Considerations for information about proper battery disposal. (See page ix, Environmental Considerations.)

and 250 VACand frequency between 47 Hz and 440 Hz. The oscilloscope

hrough the power cord grounding connector. The line fuse is internal

al rechargeable TDS3BATC battery pack. A triangle icon in the display

shows when the battery is in use, a power-plug i con shows when line

shows the charge level in the battery.

TDS3000C Series Oscilloscope User Manual 9

Getting Started

Operating Safe

Battery Power

ly with

WARNING. To avoid electric shock, connect the rear-panel ground terminal to

earth ground

when operating the oscilloscope from battery power.

For safe operation, the oscilloscope chassis should always remain at earth ground potential.

Without a connection between the chassis and earth ground, you can receive a shock from exposed metal on the chassis if you connect an input to a hazardous voltage (>30 V

,>42Vpk). To protect yourself against possible

RMS

shock, you can attach the Tektronix-supplied grounding wire from the terminal on the rear panel to earth ground. If you use a different grounding wire, it must be at least 18 gauge.

If you choose not to attach the grounding wire, you are not protected against

ric shock if you connect the oscilloscope to a hazardous voltage. You can still

elect use the oscilloscope if you do not connect a signal greater than 30 V

RMS

(42 Vpk) to the probe tip, the BNC connector center, or the common lead. Ensure that all probe common leads are connected to the same voltage.

WARNING. Hazardous voltages may exist in unexpected places due to faulty

circuitry in the device under test.

CAUTION. When operating the oscilloscope on battery power do not connect a

grounded device, such as a printer or computer, to the oscilloscope unless the

scilloscope’s grounding wire is connected to the earth ground.

10 TDS3000C Series Oscilloscope User Manual

Getting Started

Installing the Battery

To install the o

ptional battery pack, follow these steps:

1. Open the battery compartment door on the rear panel.

2. Remove the accessory tray.

Battery door (opened)

3. Slide the battery into the compartment and press it in from both sides until you hear

the latches click.

4. Press on both sides of the battery compartment door to snap it closed.

To remove the battery, follow these steps:

1. Open the battery compartment door.

2. Raise the handles on each side of the battery and use them to pull the battery

out of the oscilloscope.

TDS3000C Series Oscilloscope User Manual 11

Getting Started

Maximizing Operating Time

Charging the Battery

To ma x i m ize the

time that the oscilloscope can operate from a full battery charge,

consider doing these things:

Reduce the dis

play backlight intensity (See page 63.)

Disconnect unused active probes

Only use passive probes

The battery charges automatically when the oscilloscope is connected to line power. You can also charge the battery with the optional external charger (TDS3CHG).

Conﬁguration Typical charging time

Battery c on or off

Battery charging with TDS3CHG external charger

harging in oscilloscope with oscilloscope turned

32 hours

6 hours

NOTE. For optimal performance, charge the battery before using it for the ﬁrst

time or

after prolonged storage.

Refer to the TDS3BATC Rechargable Battery Pack Instructions (Tektronix part

r 071-0900-04) for information on storage and Battery Maintenance

numbe Guidelines.

12 TDS3000C Series Oscilloscope User Manual

Installing an Application Module

CAUTION. To avoid damage to the oscilloscope or application module, observe

the ESD precau

Optional application modules are available to extend the capability of your oscillosco Application modules can go into the two slots with windows in the upper right corner of the front panel. Two additional slots are directly behind the two you can see.

Refer to the TDS3000, TDS3000B, and TDS3000C Series Application Module Installation Manual that came with your application module for instructions on installing and testing an application module.

NOTE. If you remove an application module, the features provided by the

applic the features.

pe. You can install up to four application modules at one time.

ation module become unavailable. You can reinstall the module to restore

Getting Started

tions. (See page xii.)

Installing the Communication Module

ON. To avoid damage to the oscilloscope or communication module,

CAUTI

observe the ESD precautions. (See page xii.)

nstall the optional communications module, follow these steps:

To i

1. Turn the oscilloscope power off.

2. Press down on the latching tab to remove the blank cover.

3. Slide the communication module into the compartment until the internal

connectors are seated and the latching tab locks.

4. Turn the power on. The communication module is now ready for your use.

TDS3000C Series Oscilloscope User Manual 13

Getting Started

Latching tab

To remove a communication module, follow these steps:

1. Turn the oscilloscope power off.

2. Press down on the latching tab and then use a small screwdriver to alternately

pry out the sides of the communication module.

3. Slide out the communication module and store it in an ESD-shielded bag. Install the blank cover.

Communication port For more information, see

GPIB

RS-232

VGA Spec

The TDS3000, TDS3000B, and TDS3000C Series Digital Phosphor Oscilloscopes Programmer Manual, and Hard Copy in

ser manual. (See page 65.)

this u

iﬁcations for the I/O ports in Appendix A in this user manual.

14 TDS3000C Series Oscilloscope User Manual

Getting Started

Front-Panel M

Using the Men

enus and Controls

The front panel has buttons and controls for the functions you use most often. The front panel has menus to access more specialized functions.

uSystem

To use the menu system, follow these steps:

1. Push a front-panel menu button to display the menu you want to use.

2. Push a bottom screen button to select a menu item. If a pop-up menu appears,

continue to push the screen button to select an item from the pop-up menu.

TDS3000C Series Oscilloscope User Manual 15

Getting Started

3. Push a side scre more than one choice, push the side screen button again to make the choice.

4. Certain menu choices require you to s et a numerical value to complete the setup. Use the general purpose knob to adjust the parameter value. Push the Coarse button to make larger adjustments.

en button to choose a menu item. If the menu item contains

16 TDS3000C Series Oscilloscope User Manual

Getting Started

Using the Menu Buttons

You can use the m

1. Meas. P erforms automated measurements of waveforms.

2. Cursor. Activates the cursors.

3. Save/Recall. Saves and recalls setups and waveforms to memory or a USB

ﬂash drive.

4. Display. Changes the appearance of waveforms and the display screen.

5. QuickMenu. Activates QuickMenus such as the built-in Scope QuickMenu.

6. Utility. Activates the system utility functions, such as selecting a language.

enu buttons to perform many functions in the oscilloscope.

rtical Menu. Adjusts the scale, position, and offset of waveforms. Sets

7. Ve the input parameters.

rigger Menu. Adjusts the trigger functions.

8.T

9. Acquire Menu. Sets the acquisition modes and horizontal resolution, and

esets the delay time.

TDS3000C Series Oscilloscope User Manual 17

Getting Started

Using the Dedicated

Controls

These dedicate without the use of menus.

d buttons and controls generally control waveforms and cursors

1. Coarse. Causes the general purpose knob and position knobs to make adjustments more quickly.

2. Select. Toggles between the two cursors to select the active cursor.

3. General purpose knob. Moves the cursors. Sets numerical parameter values

for some menu items. Push the Coarse button to make adjustments quickly.

4. Vertical Position. Adjusts the vertical position of the selected waveform. Push the Coarse button to m ake adjustments more quickly.

5. Horizontal Position. Adjusts the trigger point location relative to the acquired waveforms. Push the Coarse button to make adjustments quickly.

6. Trigger Level. Adjusts the trigger level.

7. Run/Stop. Stops and restarts acquisition.

8. Single Seq. Sets acquisition, display, and trigger parameters for a single-shot

(single-sequence) acquisition.

9. Set To 50%. Sets the trigger level to the midpoint of the waveform.

10. Autoset. Automatically sets the vertical, horizontal, and trigger controls for

a usable display.

18 TDS3000C Series Oscilloscope User Manual

Getting Started

11. Force Trig. For

12. Waveform Intensity. Controls waveform intensity.

13. B Trig. Activates the B trigger. Changes the Trigger menu to set the B-trigger

parameters.

14. Delay. Enables delayed acquisition relative to the trigger event. Use horizontal Position to set the amount of delay.

15. Horizontal Scale. Adjusts the horizontal scale factor.

16. Horizontal Zoom. Splits the screen and magniﬁes the current acquisition

horizontally.

17. Waveform Off. Removes selected waveform from the display.

18. Vertical Scale. Adjusts selected waveform vertical scale factor.

19. 1, 2, (3, 4,) Math. Displays a waveform and chooses the selected waveform.

Ref shows the reference waveform menu.

ces an immediate trigger event.

20. Hard copy. Initiates a hard copy using the port selected in the Utility menu.

21. Power switch. Turns power to on or standby. Power-up time varies from

about 15 seconds to 45 seconds, depending on the oscilloscope internal calibration p rocess.

22. Wrist-strap ground. Connect a wrist strap when working with ESD-sensitive circuits. This connector is not a safety ground.

OTE. The wrist-strap ground terminal is only a ground when the oscilloscope is

connected to earth ground. When operating from a battery, connect the grounding wire to earth ground to ensure the terminal is at ground.

23. USB Flash Drive port.

24. Menu Off. Clears menu from the display.

TDS3000C Series Oscilloscope User Manual 19

Getting Started

Identifying Items in the

Display

The following i given time. Some readouts move outside the graticule area when menus are turned off.

1. Waveform baseline icons show the zero-volt level of the waveforms (ignoring the effect of offset). The icon colors correspond to the waveform colors.

tems may appear in the display; not all items are visible at any

2. Acquisition readout shows when acquisition is running, stopped, or when acquisition preview is in effect.

3. Trigger position icon shows the trigger location in the waveforms.

4. Expansion point icon shows the point that the horizontal scale expands and

compresses around.

5. Waveform record icon shows the trigger location relative to the waveform record. The line color corresponds to the selected waveform color.

6. Trigger status readout show trigger status.

7. Trigger level icon shows the trigger level on the waveform. The icon color

corresponds to the trigger source channel color.

8. Cursor and measurement readouts show results and message s.

rigger readouts show the trigger sources, slopes, and levels, and position.

9.T

10. Readout shows the delay setting or the trigger location within the record.

11. Horizontal readout shows the main or zoom time/division.

20 TDS3000C Series Oscilloscope User Manual

Getting Started

Using QuickMenus

12. Auxiliary wave of the math or reference waveforms.

13. Channel reado bandwidth limit, and invert status.

14. Triangle icon with the battery icon indicates a battery is installed and battery power is in use. The battery icon shows the approximate charge level of the battery. (See page 10, Operating Safely with Battery Power.)

15. Power-plug icon with the battery icon indicates a battery is installed but line power is in use. The battery may be charging. The battery icon shows the approximate charge level.

The QuickMenu feature simpliﬁes the use of the oscilloscope. When you push the QuickMenu button, a set of frequently used menu functions show on the display. Then, push the screen buttons around the display to operate the QuickMenu. The Reference chapter has general instructions on how to operate QuickMenus.

age 84.)

(See p

form readouts show the vertical and horizontal scale factors

uts show the channel scale factor, coupling, input resistance,

Using the Scope QuickMenu. Scope is one type of QuickMenu that you can use to control the basic oscilloscope functions. You can perform many tasks without using the regular menu system. If you need to use a function that is not contained in the Scope QuickMenu, push the button you would normally push to access that

nction. For example, if you want to add an automatic measurement, push the

fu Meas button to set up the measurement. Then, push the QuickMenu button to return to the Scope QuickMenu with the measurement also in the display.

TDS3000C Series Oscilloscope User Manual 21

Getting Started

1. Edge Trigger controls. Push these screen buttons to set trigger parameters for edge

trigger.

2. Trigger controls if either B trigger or video trigger is selected. Logic and Pulse tr

3. Cursor control. Push this screen button to turn on cursors and select the cursor type. P active cursor. Use the general purpose knob to move the active cursor.

4. Acqui

5. Channel vertical controls. Push these screen buttons to set vertical controls

for t buttons to select the channel you want to control.

6. Ve r selected.

7. Me than one is available.

NOTE. Items in the Scope QuickMenu not mentioned above are also contained

in the regular display. (See page 20.)

Other QuickMenus. Some optional application packages include a custom QuickMenu display. Those QuickMenus contain speciﬁc features that are important for the a pplication.

igger controls are not available through the QuickMenu.

ush the Select button to toggle between the two cursors to select the

sition controls. Push these screen buttons to set acquisition parameters.

he selected channel. Use the channel 1, 2, 3, 4, and the Math and Ref

tical controls if either the math waveform or a reference waveform is

nu. Push this screen button to select a speciﬁc QuickMenu display if more

22 TDS3000C Series Oscilloscope User Manual

Getting Started

Front-Panel C

onnectors

1. Probe Comp. Square wave signal source to compensate probes.

2. 1, 2, (3

, 4). Channel inputs with TekProbe interface.

3. Ext Trig. External trigger input with TekProbe interface (two-channel models only).

External trigger input speciﬁcations are in Appendix A.

TDS3000C Series Oscilloscope User Manual 23

Getting Started

Rear-Panel Co

nnectors

1. Power input. Attach to an AC power line with integral safety ground.

2. Communication Module compartment. Install the optional communication

module.

3. Ethernet port. Connects the oscilloscope to a 10BaseT local area network.

4. Ext Trig. External trigger input with TekProbe interface (four-channel models

only). External trigger input speciﬁcations are in Appendix A.

5. Ground terminal. Connect to earth ground when using battery power. (See page 10, Operating Safely with Battery Power.)

6. CAL switch. For use by authorized service personnel only.

Communication Module Connectors

24 TDS3000C Series Oscilloscope User Manual

Getting Started

1. GPIB port. Conn

2. RS-232 port. Connect to a controller or terminal for remote programmability

or printing.

3. VGA port. Connect to a VGA monitor to display the screen image.

ect to a controller for remote programmability.

TDS3000C Series Oscilloscope User Manual 25

Getting Started

26 TDS3000C Series Oscilloscope User Manual

Application Examples

This chapter presents six common oscilloscope applications:

Taking simple measurements

Analyzing si

Taking FFT measurements

Triggering on a video signal

Capturing a single-shot signal

Saving data to a USB ﬂash drive

Each application example highlights different features of the oscilloscope and gives you ideas about using the oscilloscope to solve test problems.

Taking Simple Measurements

You need to see a s ignal in a circuit, but you do not know the signal amplitude or frequency. Connect the oscilloscope to quickly display the signal and then measure its frequency and peak-to-peak amplitude.

gnal detail

ing Autoset

TDS3000C Series Oscilloscope User Manual 27

To quickly display a signal, follow these steps:

1. Connect the channel 1 probe to the signal.

2. Push the Autoset button.

The oscilloscope sets vertical, horizontal, and trigger controls automatically. You can manually adjust any of these controls if you need to optimize the display of the waveform.

Application Examples

Selecting Automatic

Measurements

When you are usi controls for each channel and uses the lowest-numbered active channel to set the horizontal and trigger controls.

The oscillos measure signal frequency and peak-to-peak amplitude, follow these steps:

1. Push the Mea

2. Push the channel 1 button and then push the Select Measurement for Ch1

screen button.

3. Select the Frequency measurement.

4. Push the more screen button and select the Pk-Pk measurement.

5. Push the

The measurements show on the screen and update as the signal changes.

ng more than one channel, the autoset function sets the vertical

cope can take automatic measurements of most displayed signals. To

s button to see the Select Measurement menu.

Menu Off button.

Measuring Two Signals

28 TDS3000C Series Oscilloscope User Manual

You are testing a piece of equipment and need to measure the gain of its audio ampliﬁer. You have an audio generator that can inject a test signal at the ampliﬁer input. Connect two oscilloscope channels to the ampliﬁer input and output as shown. Measure both signal levels and use these measurements to calculate the gain.

Application Examples

To di s p l ay

1. Push the channel 1 and 2 buttons to activate both channels.

2. Push the Autoset button.

To select measurements for the two channels, follow these steps:

1. Push the Meas button to see the Select Measurement menu.

2. Push the channel 1 button and then push the Select Measurement for Ch1

screen button.

3. Select the Amplitude measurement.

4. Push t

screen button.

5. Sele

the signals connected to channels 1 and 2, follow these steps:

he channel 2 button and then push the Select Measurement for Ch2

ct the Amplitude measurement.

TDS3000C Series Oscilloscope User Manual 29

Application Examples

Customizing Your

Measurements

6. Calculate the a

In this example you want to verify that the incoming signal to a piece of digital equipment meets its speciﬁcations. Speciﬁcally, the transition time from a low logic leve

l (0.8 V) to a high logic level (2.0 V) must be 10 ns or less.

mpliﬁer gain using the following equations:

30 TDS3000C Series Oscilloscope User Manual

Application Examples

To select the ri

1. Push the Meas button to see the Select Measurement menu.

2. Push the channel 1 button and then the Select Measurement for Ch1 screen

button.

3. Select the Rise Time measurement.

Rise time is typically measured between the 10% and 90% amplitude levels of a signal; these are the default reference levels the oscilloscope uses for rise time measurements. However, in this example you need to measure the time the signal takes to pa

You can customize the rise time measurement to measure the signal transition time betw to a speciﬁc percent of the signal amplitude or to a speciﬁc level in vertical units (such as volts or amperes).

Setting Reference Levels. To set the reference levels to speciﬁc voltages, follow these steps:

1. Push the Reference Levels screen button.

2. Push the Set Levels in screen button to select units.

se time measurement, follow these steps:

ss between the 0.8 V and 2.0 V levels.

een any two reference levels. You can set each of those reference levels

3. Push the High Ref screen button.

4. Use the general purpose knob to select 2.0 V.

5. Pus

6. Use the general purpose knob to select 800 mV.

The measurement veriﬁes that the transition time (3.842 ns) meets the speciﬁcation ( ≤ 10 ns).

htheLow Ref screen button.

TDS3000C Series Oscilloscope User Manual 31

Application Examples

Measuring Spec

digital signal, but the pulse widths vary so it is hard to establish a stable trigger. To look at a snapshot of the digital signal, follow this step:

1. Push the Single Seq button to capture a single acquisition.

Now you want measurement gating to select a speciﬁc pulse to measure. To measure the second pulse, for example, follow these steps:

1. Push the Meas button.

2. Push the ch

screen button.

3. Select th

4. Push the Gating screen button.

5. Select Between V Bar Cursors to choose measurement gating using cursors.

6. Place one cursor to the left and one cursor to the right of the second pulse.

The oscilloscope shows the width measurement (160 ns) for the second pulse.

iﬁc Events. Next you want to see the pulses in the incoming

to measure the width of each displayed pulse. You can use

annel 1 button and then push the Select Measurement for Ch1

e Positive Pulse Width measurement.

32 TDS3000C Series Oscilloscope User Manual

Application Examples

Analyzing Sig

nal Detail

You have a noisy signal displayed on the oscilloscope and you need to know more about it. You suspect that the signal contains much more detail than you can now see in the

display.

TDS3000C Series Oscilloscope User Manual 33

Application Examples

Looking at a Noisy Signal

The signal appe circuit. To better analyze the noise, follow these steps:

1. Push the Acqui

2. Push the Mode bottom button.

3. Select the Peak Detect acquisition mode.

4. Increase the Waveform Intensity control to see the noise more easily.

Peak detect emphasizes noise spikes and glitches in your signal as narrow as 1 ns, even when the time base is set to a slow setting.

ars noisy and you suspect that noise is causing problems in your

re Menu button.

Separating the Signal from

Nois

The Re acquisition modes. (See page 55.)

Now you want to analyze the signal shape and ignore the noise. To reduce random nois

1. Push the Acquire Menu button.

2. Push the Mode bottom button.

3. Select the Average acquisition mode.

Averaging reduces random noise and makes it easier to see detail in a signal. In the next example, a ring shows on the rising and falling edges of the signal when the noise is removed.

ference chapter has more information about peak-detect and the other

e in the oscilloscope display, follow these steps:

34 TDS3000C Series Oscilloscope User Manual

Application Examples

Taking Cursor Measurements

You can use the cursors to take quick measurements on a waveform. To measure the ring frequency at the rising edge of the signal, follow these steps:

1. Push the Cursor button.

2. Push the Function screen button.

3. Select VBarscursors.

4. Push the VBarUnitsscreen button.

5. Select 1/seconds (Hz).

6. Place

7. Push the Select button.

8. Place the other cursor on the next peak of the ring.

The cursor Δ readout shows the measured ring frequency is 227 kHz.

one cursor on the ﬁrst peak of the ring using the general purpose knob.

TDS3000C Series Oscilloscope User Manual 35

Application Examples

Using Delay

You are analyzi the waveform pulse width. You notice that the measurement is not stable, which implies that there is jitter in the pulse width.

ng a pulse waveform and use the + Width measurement to measure

36 TDS3000C Series Oscilloscope User Manual

Application Examples

To use delay to s

1. Push the Delay button.

2. Adjust the horizontal Position control to set the delay close to the nominal

pulse width (210 μs). Push the Coarse button to make delay adjustments more quickl

The falling edge of the pulse is now near the center of the screen. When delay is on, the ho remains in the center of the screen.

ee the jitter, follow these steps:

y. Push the Coarse button again to ﬁne tune the delay time.

rizontal expansion point separates from the trigger point and

3. Adjust the horizontal Scale to a faster time base setting a nd increase the Waveform Intensity to see the jitter in the pulse width.

NOTE. You can toggle the delay function on and off to view signal details at two

different areas of interest.

TDS3000C Series Oscilloscope User Manual 37

Application Examples

Measuring Jitter

To measure the p

1. Push the Cursor button.

2. Push the Function screen button.

3. Select the VB

4. Push the Bring Both Cursors On Screen screen button to quickly locate

the cursors

5. Place one cursor at the ﬁrst falling edge and place the other cursor at the last falli

6. Read the peak-to-peak jitter in the Δ readout (1.40 μs).

eak-to-peak jitter, follow these steps:

ars cursors.

ng edge.

You can also measure the minimum and maximum pulse widths. When you select the ﬁrst cursor, the @ readout displays the minimum pulse width (210 μs). W hen you select the second cursor, the @ readout displays the maximum pulse width (211 μs).

38 TDS3000C Series Oscilloscope User Manual

Taking FFT Measurements

You can take FFT measurements to determine if low-level distortion is present, or to ﬁnd the source of noise in a mixed circuit.

Application Examples

Detecting Distortion

A pure sine wave can be input into an ampliﬁer to measure distortion; any ampliﬁer distortion will introduce harmonics in the ampliﬁer output. Viewing the FFT of the output can determine if low-level distortion is present.

You are using a 20 MHz signal as the ampliﬁer test signal. You would set the oscilloscope and FFT parameters as listed in the next table.

Control Setting

1 Coupling AC

Acquisition Mode Average 16

Horizontal Resolution

Horizontal Scale

FFT Source Ch1

FFT Vert Scale

FFT Window Blackman-Harris

enextﬁgure, the ﬁrst component at 20 MHz (ﬁgure label 1) is the source

In th

Normal (10k points)

100 ns

dBV

signal fundamental frequency. The FFT waveform also shows a second-order harmonic at 40 MHz (label 2), and a fourth-order harmonic at 80 MHz (label

3). The presence of components 2 and 3 indicate that the system is distorting the signal. The even harmonics suggest a possible difference in signal gain on half of the signal cycle.

TDS3000C Series Oscilloscope User Manual 39

Application Examples

Identifying the Source of

Noise

Noise in mixed d

igital/analog circuits can be easily observed with an oscilloscope.

However, identifying the sources of the observed noise can be difﬁcult.

The FFT wavefo

rm displays the frequency content of the noise. You may then be able to associate those frequencies with known system frequencies, such as system clocks, oscillators, read/write strobes, display signals, or switching power supplies.

The highest frequency on the example system is 40 MHz. To analyze the example signal, you would set the oscilloscope and FFT parameters as listed in the next table.

Control Setting

1 Coupling AC

Acquisition Mode

Horizontal Resolution

Horizontal Scale

Bandwidth 150 MHz

FFT Source Ch1

FFT Vert Scale

FFT Window Hanning

Sample

Normal (10k points)

4.00 μs

dBV

In the next ﬁgure, notice the component at 31 MHz (ﬁgure label 1). This coincides with a 31 MHz memory strobe signal in the example system. There is also a

quency component at 62 MHz (label 2), which is the second harmonic of the

fre strobe signal.

40 TDS3000C Series Oscilloscope User Manual

Application Examples

Triggering on

a Video Signal

You are testing the video circuit in a piece of medical equipment and need to display the video output signal. The video output is an NTSC standard signal. Use the video tri

To trigger on the video ﬁelds, follow these steps:

1. Push the Trigger Menu button.

2. Push the Type screen button to select Video.

3. Push the Standard screen button to select 525/NTSC.

gger to obtain a stable display.

4. Push the Trigger O n screen button.

5. Selec

6. Adjust the horizontal Scale to see a complete ﬁeld across the screen.

7. Push the Acquire Menu button.

8. Push the Horizontal Resolution screen button.

9. Select Normal acquisition resolution.

Normal acquisition resolution is the best choice to acquire a video ﬁeld signal because the signal contains a great amount of horizontal detail.

t Odd.

TDS3000C Series Oscilloscope User Manual 41

Application Examples

If the signal had been noninterlaced, you could choose to trigger on All Fields.

Triggering on Lines. You can also look at the video lines in the ﬁeld. To trigger on the lines

1. Push the Trigger O n screen button.

, follow these steps:

2. Select All Lines.

3. Adjust the horizontal Scale to see a complete video line across the screen.

NOTE. The optional TDS3VID and TDS3SDI application modules add new video

functions such as a video QuickMenu, video Autoset, trigger on custom scan rates, trigger on speciﬁc video lines, vectorscope (vectorscope supports component video only), video picture, trigger on analog HDTV signals, and view 601 digital

ideo signals (TSD3SDI only).

42 TDS3000C Series Oscilloscope User Manual

Application Examples

Looking at Modu

the modulation in a video signal. To see a similar modulation display on the oscilloscope screen, follow these steps:

1. Start with triggered display of the video lines.

2. Push the Acq

3. Push the Horizontal Resolution screen button.

4. Select Fast Trigger acquisition resolution.

5. Adjust the Waveform Intensity control for the amount of modulation you

want to see.

The oscilloscope now shows signal modulation in shades of intensity and appears similar to the display of a video waveform monitor or an analog oscilloscope. Fast trigger acquisition resolution is the best choice to acquire a video line signal with a ra

pidly changing shape.

lation. A dedicated video waveform monitor clearly shows

uire Menu button.

turing a Single-Shot Signal

Cap

The reliability of a reed relay in a piece of equipment has been poor and you need to investigate the problem. You suspect that the relay contacts arc when the relay

ens. The fastest you can open and close the relay is about once per minute so

op you need to capture the voltage across the relay as a single-shot acquisition.

o set up for a single-shot acquisition, follow these steps:

1. Adjust the vertical Scale and horizontal Scale to appropriate ranges for the signal you expect to see.

2. Push the Acquire Menu button.

3. Push the Horizontal Resolution screen button.

TDS3000C Series Oscilloscope User Manual 43

Application Examples

Optimizing the Acquisition

4. Select Normal a

5. Push the Single Seq (single sequence) button.

The Single Seq button sets trigger parameters to the correct settings for a single-shot a cquisition.

The initial acquisition shows the relay contact beginning to open at the trigger point. This is followed by a large spikes that indicate contact bounce and inductance in the circuit. The inductance can cause contact arcing and premature relay failure.

cquisition resolution.

Before you take the next acquisition, you can adjust the vertical and horizontal controls to give you a preview of how the n ext acquisition might appear. As you adjust these controls, the current ac quisition is repositioned, expanded, or

ressed. This preview is useful to optimize the settings before the next

comp single-shot event is captured.

n t he next acquisition is captured with the new vertical and horizontal

Whe settings, you can see more detail about the relay contact opening. You can now see that the contact bounces several times as it opens.

44 TDS3000C Series Oscilloscope User Manual

Application Examples

Using the Horizontal Zoom

Function

If you want to take a close look at a particular spot on the acquired waveform, use the horizontal zoom function. To look closely at the point where the relay contact ﬁrst begins to open, follow these steps:

1. Push the zoom button

2. Use the horizontal Position to place the expansion point close to where the

relay contact begins to open.

3. Adjust the horizontal Scale to magnify the waveform around the expansion point.

The ragged waveform and the inductive load in the circuit suggest that the relay contact may be arcing as it opens.

he zoom function works equally well when acquisition is running or is stopped.

T Horizontal position and scale changes affect only the display, not the next acquisition.

TDS3000C Series Oscilloscope User Manual 45

Application Examples

Saving Data to

aUSBFlashDrive

You need to do some work inside a remote site. You expect to use the oscilloscope to look at signal waveforms, to bring the waveform information back to the ofﬁce to complete a USB ﬂash drive.

When you need to capture screen images, it may be most convenient to ﬁrst save them to a USB ﬂash drive. Once on the USB ﬂash drive, you can load the screen images into a PC, print hard copies with a printer attached to your PC, or import the screen images into desktop publishing software to produce a report.

Similarly, you can also save waveform data on the USB ﬂash drive. From the ﬂash drive, you can recall waveforms to the oscilloscope display or you can import the data into spreadsheet and Mathcad software to perform additional analysis.

report, and to perform additional analysis. To do this, take along a

Remote site

Saving Screen Images

If you have oscilloscope setups that you want to use again, you also can store them on the USB ﬂash drive. The Reference chapter has more information on this capability. (See page 84, Save/Recall.) For information about remote control accessories, see Appendix C: Accessories.

While working at the remote site you dis cover a control signal that you want to capture periodically to show its long-term variation. You want to include these waveforms in a report you are preparing back at the ofﬁce.

Your desktop publishing software can import BMP graphics, so you decide to use this format for the screen images. To setup this conﬁguration, follow these steps:

1. Insert a USB ﬂash drive into the USB ﬂash drive port.

2. Push the Utility button.

3. Push the System bottom button to select Hard Copy.

4. Push the Format screen button.

5. Select BMP Mono Windows mono image ﬁle format (you may need to push the -more-screen button several times

6. Push the Port screen button.

before you see this choice).

46 TDS3000C Series Oscilloscope User Manual

Application Examples

7. Select File to s

8. Push the hard copy button

The oscilloscope reads the ﬂash drive directory and displays its contents.

Naming Files. You should give ﬁles descriptive names so you can recognize them when you get back to the ofﬁce. You will be saving images of the control signal so you decid

The oscilloscope can append an automatic sequence number to the target ﬁle name. This the same control signal every ﬁve minutes. To set up the target ﬁle name and automatic sequence, follow these steps:

1. Push the File Utilities bottom button.

2. Use the g

3. Select the Rename screen button.

4. Use the screen buttons to clear the existing ﬁle name and enter the new

ﬁle name CNTRL???.BMP. The question marks are placeholders for an autom

5. Push the OK Accept screen button to setup the target base ﬁle name.

feature is convenient because you want to capture a screen image of

atic number sequence from 000 to 999.

endhardcopiestoaUSBﬂash drive.

to save the image.

e if CNTRL is a logical target ﬁle name to use.

eneral purpose knob to highlight the ﬁle TEK?????.BMP.

6. Push Menu Off to remove the ﬁle list from the display.

TDS3000C Series Oscilloscope User Manual 47

Application Examples

Running the Tes

steps:

1. Display the si in the screen images.

2. Push the hard c opy button

3. Repeat step 2 every few minutes until you are ﬁnished with the test.

4. When you are ﬁnished, push Utility to see the list of sequential ﬁles that

have been saved.

t. To capture the control signal every few minutes, follow these

gnal, measurements, and m enus as you want them to appear

g Waveform Data

Savin

The ﬁles are labeled with their sequential names, as well as the time and date each was created.

You ﬁnd another signal that you want to analyze with a spreadsheet program back at the ofﬁce. To save the waveform data on a USB ﬂash drive, follow these steps:

1. Display the signal on the oscilloscope screen.

2. Push the Save/Recall button.

3. Push the Save Waveform screen button.

lect To File.

4. Se

5. Select Spreadsheet File Format. The default target ﬁle, TEK?????.CSV, is

ow automatically highlighted.

6. Push the Save To Selected File screen button to save the waveform.

7. Push the File Utilities screen button to see the saved waveform ﬁle

TEK00000.CSV in the USB ﬂash drive directory.

48 TDS3000C Series Oscilloscope User Manual

Application Examples

TDS3000C Series Oscilloscope User Manual 49

Application Examples

50 TDS3000C Series Oscilloscope User Manual

Reference

Acquisition Controls

Run/Stop Button

This chapter contains detailed information about the operation of the oscilloscope. The topics in this chapter are arranged by front-panel button or control group name.

Push the Run/Stop button to stop and start waveform acquisition. You can also push Run/Stop when you want to resume continuous acquisition after a single-sequence acquisition. A readout in the top left corner of the display shows the status of the acquisition.

Acquisit

Run: The acquisition is running.

Roll: A roll-mode acquisition is running.

Stop:

PreVu:

While the acquisition is running or stopped, you can use these controls to examine the waveforms:

While the acquisition is stopped, you can change the vertical and horizontal controls to use in the next acquisition. (See page 54, Vertical and Horizontal Preview.)

ion status readout

Channel buttons to select a channel

Zoom button with horizontal Position and Scale to magnify waveforms (does not affect the actual time base or trigger position settings)

Waveform Intensity to adjust gray-scale level

Cursor button to activate cursors to measure waveforms

as button to select automatic measurements of waveforms

Hard copy button to print a hard copy

Descript

The acq

Previewing; waiting for trigger.

ion

uisition is stopped.

Single Sequence Button

Push the Single Seq button to execute a s ingle-shot acquisition. The function of the Single Seq button depends on the acquisition mode.

Acquisition mode Single Seq function

TDS3000C Series Oscilloscope User Manual 51

Reference

Acquisition mode Single Seq function

Sample or Peak Detect One acquisition of each displayed channel is acquired,

concurrently

Envelope N or Average N

N acquisitions of each displayed channel are acquired (N is adjusta

ble with the general purpose knob)

When you push the Single Seq button, the oscilloscope does the following things:

Autoset

Button

At sweep spe

eds of 20 ms/div and faster, the trigger mode is set to Normal

The trigger system arms and an LED lights next to the Single Seq button

After the single-sequence acquisition is complete, the acquisition stops and the light next to the Single Seq button turns off.

Push the Single Seq button again to acquire a new sequence, or push the Run/Stop button to restart continuous acquisition.

Push the Autoset button to automatically adjust the vertical, horizontal, and trigger controls for a usable display. You can manually adjust any of these controls if you

o optimize the display.

need t

When you use more than one channel, the autoset function sets the vertical scale

ach channel and positions the channels to prevent overlapping. The autoset

for e function selects the lowest-numbered channel in use and then uses that channel to set the horizontal and trigger controls.

The autoset function also changes the following oscilloscope settings:

uisition mode is set to Sample

Acq

Bandwidth limits are set to Full

Zoom is turned off

Trigger is set to Auto mode and minimum holdoff

Trigger is set to Edge type, DC coupling, and rising slope

B trigger is turned off

XY display format is turned off

Channel 1 is turned on and selected if no active channels are in use

If you push the Autoset button by accident, you can undo it with these steps:

1. Push the Acquire Menu button.

2. Push the Autoset screen button and then push the Undo Autoset screen

button.

52 TDS3000C Series Oscilloscope User Manual

Reference

Waveform Inten

sity

The Waveform Intensity knob adjusts the intensity of the waveforms in the display.

The term Digital Phosphor represents the way this control simulates the intensity control of an analog oscilloscope. At maximum intensity, all waveform points are displayed at full brightness. As you decrease the intensity, you can see intensity gradingint

he waveforms. The brightest parts of the waveform are the points most frequently acquired; the dimmer parts represent less frequently acquired points. All points decay in intensity over time unless the display persistence is set to inﬁnite.

Use a medium intensity setting to g et an analog-oscilloscope view of time-varying signals and those containing modulatio n. Use the maximum intensity setting to view the signals the way most digital oscilloscopes display them.

You can turn on display persistence to slow or prevent the decay of the waveform points. With persistence on, you can simulate the function of an analog storage oscilloscope. (See page 63, Display.)

NOTE.

The waveform intensity may change when you change oscilloscope acquisition modes or horizontal scale settings. Use the INTENSITY knob to readjust waveform intensity.

Acquire Menu

Push the Acquire Menu button to show the Acquire menu.

tom

Bot

Mode

Horizontal Resolution

Reset Horizontal Delay

Sid

mple

Peak Detect Detects glitches and reduces the

Envelope N

Average N Reduces random or uncorrelated

Fast Trigger (500 points)

Normal (10k points) Acquires 10,000 point waveforms

Set to 0 s

cription

Des

e for normal acquisition.

ssibility of aliasing.

aptures variations of a signal

C over a period of time. (Adjust N with the general purpose knob.)

noise in the signal display. (Adjust N with the general purpose knob.)

Acquires 500 point waveforms at a fast repetition rate.

with more horizontal detail.

Resets the horizontal delay time to zero.

TDS3000C Series Oscilloscope User Manual 53

Reference

Bottom Side Description

Anomaly

Executes the autoset function. (Optional application modules may add choices to autoset functions.)

Reverts to the settings before the last autoset.

Enables or disables the WaveAlert function. (See page 58, WaveAlert

Waveform An

the general purpose knob to set

ity from 0% (least sensitive)

sensitiv to 100% (most sensitive).

When On, the oscilloscope beeps when it detects a waveform anomaly

When On waveform acquisition when there is a waveform anomaly on any channe anomalies remain displayed on the screen.

When On, the oscilloscope sends an ima copy device or USB ﬂash drive ﬁle when there is a waveform anomaly on an

When the anomalous waveform(s) data to a ﬁle on a USB ﬂash drive.

Highlights the entire anomalous waveform.

in a waveform.

on any active channel.

, the oscilloscope stops

l. The input waveforms and

ge of the screen to the hard

y channel.

On, the oscilloscope saves

Autoset

WaveAlert

Normal Autose

Undo Autoset

Wfm Anomaly Detection

On Off

Sensitivity nn.n% Sets the WaveAlert sensitivity. Use

Beep On Anomaly

On Off

Stop On

On Off

Hard Copy On Anoma

On Off

To Di s k On

Wfms Anomaly

On Off

Highlight Entire Wfm

Highlight Anomalies Highlights just the anomalous data

execute specialized

omaly Detection.)

Key Poin ts

Vertical and Horizontal Preview. The vertical and horizontal preview functions let

you change the vertical and horizontal controls while the acquisition is stopped or

hile it is waiting for the next trigger. The oscilloscope rescales and repositions

w the current acquisition in response to the new control settings, and then uses the new settings for the next acquisition.

Preview helps you optimize these control settings before the next acquisition; this makes it easier to work with signals that are single-shot or have a low repetition rate. (Seepage116,Vertical Preview.) (See page 71, Horizontal Zoom and Preview.)

54 TDS3000C Series Oscilloscope User Manual

Reference

While the acqui changes will only take affect with the next acquisition. There is no preview for control changes other than the vertical and horizontal controls.

The preview functions also do not affect automatic measurements, cursor measurements, or the Math waveform. This data for these functions is always based on the current acquisition. If you rescale or reposition a channel waveform horizontally, it may not appear time-correlated to the automatic measurements, cursor measurements, or the Math waveform.

Acquisition Modes. You can choose one of four acquisition modes: Sample, Peak Detect, Envelope, or Average. The next few pages describe these acquisition modes in detail.

sition is stopped you can make changes to other controls, but those

Sample. Use Sample acquisition mode for the fastest acquisition at any SEC/DIV

ting. Sample mode is the default mode.

set

Peak Detect. Use Peak Detect acquisition mode to limit the possibility of aliasing. Also, use Peak Detect for glitch detection. You can see glitches as narrow as 1 ns.

Peak Detect is only functional for sample rates up to 125 MS/s. For 250 MS/s and faster sample rates, the oscilloscope reverts to Sample acquisition mode, where the narrowest detectable pulse width is 1/(sample rate).

TDS3000C Series Oscilloscope User Manual 55

Reference

Envelope. Use Envelope acquisition mode to capture the minimum and maximum extremes of a signal over a speciﬁed number of acquisitions (N). The enveloped wavefor

m data acquisition clears and then starts over after each N acquisitions. If you push the Single Seq button, envelope acquisition stops after N acquisitions. Use the general purpose knob to set the number of acquisitions.

Average. Use Average acquisition mode to reduce random or uncorrelated noise in the signal you want to display. The averaged waveform is a running average over a

speciﬁed number of acquisitions (N). If you push the Single Seq button, average acquisition stops after N acquisitions. Use the general purpose knob to set the number of acquisitions.

If you probe a noisy square wave signal that contains intermittent, narrow glitches, the waveform displayed will vary depending on the acquisition mode you choose.

Sample

Envelope Average

Peak Detect

56 TDS3000C Series Oscilloscope User Manual

Reference

Acquisition Re

solution. You can choose either Normal or Fast Trigger acquisition

resolution. This setting determines the record length that is acquired and affects the other factors shown in the next table.

Factor Normal Fast trigger

Record length 10,000 points 500 points

Maximum acqu

Maximum hor

isition rate

izontal zoom

700 waveforms/s 3,400 waveforms/s

200X 10X

Choose Normal or Fast Trigger acquisition resolution based on the characteristics of the signal you want to acquire.

Signal ch

Large amo

Shape is stable or changes relatively slowly

Single shot

High trigger repetition rate

Shape changes rapidly

Contai

aracteristic

unt of horizontal detail

ns modulation

Better ch

Normal

Fast Trigger

oice

TDS3000C Series Oscilloscope User Manual 57

Reference

WaveAlert Wave

form Anomaly Detection. WaveAlert provides a way to detect

when a waveform deviates from a steady-state condition. WaveAlert monitors the current waveform acquisition and compares it to the previous DPO waveform acquisitions, using a sensitivity value to adjust the comparison tolerance. If the current acquisition exceeds the comparison tolerance, the oscilloscope considers the current acquisition as an anomaly.

Anomaly

The osc

illoscope can respond to an anomalous waveform by stopping acquisitions, emitting a beep, saving the anomalous waveform to a USB ﬂash drive ﬁle, printing the screen image to a hard copy device, or any combination of the above. You can also select to highlight just the anomalous data in a waveform, or the entire anomalous waveform.

To use WaveAlert, follow these steps:

1. Display the waveform or waveforms on the screen.

2. Push the Acquire Menu front-panel button.

3. Pus

htheWaveAlert bottom button.

4. Push the Wfm Anomaly Detection side button to select On.

5. Push -more-1of2andthentheHighlight Anomalies side button to select

On.

6. Push -more-2of2andthentheSensitivity side button.

7. Use the general purpose knob to set the comparison sensitivity value. As

signal noise and intensity levels affect the displayed waveform, you will need to experiment with the sensitivity setting to reduce the number of false anomalies due to signal noise.

8. Use the Waveform Intensity front-panel button to adjust the persistence

of the anomaly waveform.

58 TDS3000C Series Oscilloscope User Manual

Reference

9. Once you have se push one or more side menu buttons to select the actions to perform when the oscilloscope detects an anomaly.

10. To restart WaveAlert while in Stop On Anomaly, push the Acquire Run/Stop front panel button.

WaveAlert Key Points.

You can use WaveAlert to monitor up to four waveforms or DPO Math waveforms. However, adjacent waveforms can not touch or overlap on the screen.

To increase your chances of capturing an anomaly by acquiring the maximum number of waveforms per second, set Acquire > Horizontal Resolution to Fast Trigger (500 points).

When WaveAlert is on, the front-panel Waveform Intensity knob controls the persistence of the anomalous waveform instead of waveform intensity.

To capture a very random event (minutes to hours), enable the Wfms To Disk

On Anomaly function to write anomalous w aveform data to a USB ﬂash

ﬁle in .isf format. The number of ﬁlesyoucansavedependsonthe

drive waveform record length. You can determine when the anomaly occurred by checking the ﬁle create date and time.

t the sensitivity value to reduce or eliminate false anomalies,

Cursor

YT Cursor Menu

You can use WaveAlert on DPO math waveforms.

nging the vertical or horizontal oscilloscope settings does not affect the

Cha sensitivity setting. The sensitivity is calculated from the new waveform data after changing the oscilloscope settings.

Cursors are on-screen markers that you position to take waveform measurements. There are two cursor types: YT cursors and XY cursors. (See page 62, XY Cursor Menu.)

The following YT cursor menu items are available while you are in YT display mode (Display > XY Display > Off (YT)). Push the Cursor button to show the cursor menu.

Bottom Side Description

TDS3000C Series Oscilloscope User Manual 59

Reference

Bottom Side Description

Function

Mode

VBar Units

H Bar

its

Off Turns cursors off.

H Bars Use to make ver

V Bars Use to make both vertical and horizontal

measurement

Bring Selec Cursor to Center Screen

Bring Both Cursors On Screen

Independent

Tracking

Sec (s) / 1/sec (Hz)

Ratio (%) Sets V Bar measurement units to

Phase

Use Cursor Positions as %/°

Use 5 divs as %/°

Base

atio (%)

Use Cursor Positions as 100%

Use 5 divs as 100%

ted

(°)

Moves the active cursor to center screen.

Moves any off-screen cursor onto the screen.

Sets curs

Sets curs cursor 1 is selected.

Sets horizontal units to seconds or frequency (Hz).

percen

Sets V degrees.

Sets the V Bar measurement scale so that 0% or 0° is the current position of the l is the current position of the right V Bar cursor.

Sets the V Bar measurement scale so tha 360°, where 0% or 0° is -2.5 divisions and 100% or 360° is +2.5 divisions fro

Se as the selected w aveform’s vertical measurement units (volts, IRE, dB, and so

Sets the H Bar measurement scale so that 0% is the current position of the lowest H Bar cursor and 100% is the current position of the highest H Bar cursor.

Sets H Bar measurement scale so that 5 screen major divisions is 100%, where 0% is -2.5 divisions and 100% is +2.5 divisions from the center horizontal graticule.

ors to move independently.

ors to move together when

Bar measurement units to

eft V Bar cursor and 100% or 360°

t 5 screen major divisions is 100% or

m center vertical graticule.

ts the H Bar units to be the same

on).

ets H Bar units to percent.

tical m easurements.

60 TDS3000C Series Oscilloscope User Manual

Reference

Key Points

Cursor Movemen

t. Use the general purpose knob to move the active cursor. Push

the Select button to change which cursor is active. The active cursor is the solid line.

Faster Cursor Movement. Push the Coarse button to set the general purpose knob to make faster cursor movement.

Finding Cursors. When using zoom, delay, or the fastest time base settings, the cursors can go off screen. If you w ant to ﬁnd them, use the Bring Both Cursors On Screen function to move them onto the screen.

Fine Cursor Movement. When you magnify the waveform with the zoom function, you can easily set the cursor to any point on the waveform.

Δ4.16V

@-1.78V

Horizontal bar cursors Vertical bar cursors

Δ6.32V

@3.16V

Δ5.86μs

@1.06μs

Δ Readout. The Δ readouts indicate the difference between the cursor positions.

@ Readout. For H Bar or V Bar cursors, the voltage readout after the @ symbol

indicates the location of the active cursor relative to zero volts. For V Bar cursors, the time readout after the @ s ymbol indicates the location of the active cursor relative to the trigger point.

Cursor Interaction with Preview. If you change a vertical or horizontal control setting while acquisition is stopped or it is waiting for trigger, the cursors move with the waveforms and cursor measurements remain valid.

Taking Gray-Scale Measurements. Using cursors is often the best way to

mple measurements on waveforms that contain signiﬁcant gray-scale

take si information. The automatic measurements operate only on the latest acquisition, not on the previous acquisitions that are displayed in gray scale. However, you can set the cursors to surround and measure the gray-scale area of the waveform.

CursorsatSamePosition. If both cursors are at the same position, and H Bars or V Bars are set to Ratio or Phase, both cursors are set to 0% (or 0°). 100%/360° is set to one pixel width away from the cursor position.

V Bars and FFT. When the selected waveform is an FFT waveform, selecting V Bars and Phase sets the measurement to percent.

Tracking Mode. In cursor tracking mode, both cursors move together when cursor 1 is selected. Enabling tracking mode automatically selects cursor 1 as the active cursor. If cursor 2 is selected while in tracking mode, only cursor 2 will move.

TDS3000C Series Oscilloscope User Manual 61

Reference

XY Cursor Menu

The following XY cursor menu items are available while you are in XY display mode (Display > XY Display > Triggered XY). Push the Cursor button to show the cursor me

Bottom Side Description

Function

Mode

nu.

Off Turns cursors off.

Waveform Turns waveform cursors on and

displays measurements in rectangular format (X and Y values). Use the front-panel Select button to select whichcursortomove(theactive cursor). Use the general purpose knob to move the active cursor.

Independent

Tracking

Sets cursors to move independently.

Sets cursors to move together when the reference cursor is selected.

Key Poin ts

NOTE. The Advanced Analysis application module (TDS3AAM) adds more XY

cursor features, including graticule cursors and polar readouts.

XY Waveform Cursors. To turn off the XY waveform cursor measurement, push the front panel Cursor button, then push the Cursor Function Off side menu button.

Measurements. The XY waveform cursor measurements show difference (Δ)and absolute (@) values for the X axis, the Y axis, and the time of the active cursor.

ΔX: 1.43V

ΔY: 2.14V

Δt: -660ns

@X: -140mV

@Y: 480mV

@t: 1.61ms

There are two waveform cursors; a reference cursor , and a delta cursor . All difference (Δ) measurements are measured from the reference cursor to the delta cursor. A negative ΔX measurement means that the delta cursor is positioned earlier in the waveform record than the reference cursor. A negative ΔY measurement means that the delta cursor is positioned at a lower Y waveform signal level than the reference cursor.

All absolute ( @) measurements are referenced to the XY waveform’s 0, 0 origin, and show the value of the active cursor.

0, 0 Origin. The XY waveform origin is the 0 volt point of each source waveform. Positioning both source waveform 0 volt points on the vertical center graticule places the origin in the center of the screen.

62 TDS3000C Series Oscilloscope User Manual

Reference

Display

Switching Betw

een XY and YT. You can switch between XY and YT display mode

to see the location of the cursors in the YT waveform. The waveform record icon at the top of the graticule also shows the relative cursor positions in the waveform record.

Waveform Sources. You can use XY cursors on active acquisitions, single sequence ac

quisitions, and reference waveforms. You need to store both XY source waveforms in order to recreate an XY waveform. The X axis waveform must be stored in Ref1.

Push the Display button to show the display menu.

Bottom Side Descript

Wavefor Display

Backlight

nsity

Inte

Graticule Full, Grid,

XY Display

Color Palette

Dots Onl

Persis

Set to Auto Sets the Waveform Intensity knob to

Clear Pers

High

Medium

Low Use to extend battery-operation time.

Cr Frame

Off (YT) Turns off an XY display.

Ch1 (X) Versus Sets Ch2, Ch3, or Ch4 as the Y channel

Ref1 (X) Versus

Gated By

Normal

Monochrome

tTime

istence

oss Hair,

riggered XY

ated XYZ

Set to on see dots and vectors.

Sets persist time.

control the persistence time.

Clears any displayed persistence.

Use f

Use

Sets the graticule type.

Turns on gated XY display. Displays XY s a set level. Only available on 4-channel instruments.

versus Ch1 as X.

Sets Ref2, Ref3, or Ref4 as the Y channel versus Ref1 as X.

Sets Ch2, Ch3, or Ch4 as the Z-channel gate source, and sets the gating channel threshold level.

Selects the color display.

Sets all waveforms to high-contrast black and white.

ion

to see dots only. Set to off to

or bright ambient conditions.

for dim ambient conditions.

urns on triggered XY display.

ignals when Z-channel signal is above

TDS3000C Series Oscilloscope User Manual 63

Reference

Key Poin ts

Waveform Dots a

samples can be ﬁlled; increase the Waveform Intensity control to increase the amount of vector ﬁll between samples. The vector ﬁll is most visible on fast signal edges or when the horizontal zoom

Turn Dots Only on if you want to see just the actual samples.

Waveform Persistence. Turn on waveform persistence to slow the decay of waveform points. You can set the persistence to a speciﬁc time or to inﬁnite. Inﬁnite pe control setting that erases the display.

Display Colors. The channel buttons, waveforms, icons, and readouts are color-codedtohelpyouidentifythemeasily. The colors are preset and cannot be adjusted. However, you can select the Monochrome Color Palette if you prefer to see all t

XY Waveform Triggering. The XY waveform is triggered so you can synchronize periodic input signals to the XY waveform. This feature is useful when only one part of the period contains valid information that you want to see in the XY format. Set the time b ase and trigger location to acquire just that part of the period.

When you want to see the complete period of the signals regardless of the time base setting, set the trigger source to an unused channel and the trigger mode to Au

he waveforms in high-contrast black and white.

to.

nd Vectors. With Dots Only set to off, the vectors between

is turned on.

rsistence keeps all waveform points in the display until you change a

XY Waveform Scale and Position. If you want to display channel 1 in the horizontal axis versus channel 3 in the vertical axis, for example, use these controls to scale and position the XY waveform:

Push the channel 1 button and use the vertical Scale and Position controls to set the horizontal scale and position of the XY waveform.

Push the channel 3 button and use the vertical Scale and Position controls to set the vertical scale and position of the XY waveform.

XY Waveform Restrictions. The math waveform, zoom, and autoset functions do not work in the XY display format. All reference waveforms displayed in XY format must have the same record length, 500 or 10,000 points.

Gated XYZ. Displays XY signals only when the Z (gating) channel is true. Gated XYZ is similar to analog oscilloscope modulated XYZ mode except that the displayed XY signal is either on or off; there is no intensity modulation. Gated XYZ is useful for showing constellation diagrams.

64 TDS3000C Series Oscilloscope User Manual

Reference

Hard Copy

Connecting a Printer

SettingUptoPrint

Push the Gated B general purpose knob sets the Z-channel threshold level. Z-channel signals above the set threshold are true and open the XY signal gate; Z-channel signals below the set threshold are false and close the XY signal gate. The gating channel is always a high-true logic; to emulate a low-true gating logic, use the Vertical menu to invert the Z-channel signal.

XY and XYZ Cursors. (See page 62, XY Cursor Menu.)

Push the hard copy button at the left of the display to make a hard copy. You canalsostorehard-copyimagesonaUSBﬂash drive (in normal or compressed format) and then transfer them later to a PC for printing or use in a report.

Use the rear-panel RS-232 (available on the optional communication module), or Ethernet port to connect your oscilloscope to a printer.

To set up the oscilloscope to print a hard copy, follow these steps:

1. Push the Utility menu button.

y Screen button to Select the Z (gate) Source Channel. The

Key Points

2. Push the System bottom button to select Hard Copy.

3. Push the Format screen button and then choose the printer format appropriate

for your application.

4. Push the Options screen button to select the image orientation (portrait or

landscape) as well as turn on or off hard copy ﬁle compression.

5. Push the Ink Saver screen button and select On for most applications. If you

want the hard copy colors to be the same as the screen colors, you can select

Off. (Seepage66,Ink Saver and Preview.)

6. Push the Port screen button and select the port that your printer is connected

to, or select File to save the hard copy on a USB ﬂash drive. (See page 86,

Using a USB Flash Drive.)

7. Push the hard copy button

Printer Formats. The oscilloscope supports the following printers and ﬁle formats.

Format Description

Thinkjet HP monochrome ink-jet printer

Deskjet mono HP monochrome ink-jet printer

Deskjet color HP color inkjet printer

Laserjet HP monochrome laser printer

TDS3000C Series Oscilloscope User Manual 65

Reference

Format Description

Epson

TIFF

Interleaf *.img Interleaf image object ﬁle format

RLE color

PCX mono PC Paintbrush monochrome image ﬁle format

PCX color PC Paintbrush color image ﬁle format

BMP mono

BMP color

EPS mono Encapsulated PostScript monochrome image

EPS color Encapsulated PostScript color image

Jet

Bubble

445

DPU-3

PNG color Portable Network Graphics color image

Copy File Compression. When compression is set to On, the oscilloscope

Hard

Epson 9-pin an printers

*.tif Tag image ﬁle format

Windows color image ﬁle format

Windows monochrome image ﬁle format

Windows color image ﬁle format

Canon BJC-50, BJC-80 color printers

Seiko DPU-3445 thermal printer

d 24-pin dot matrix printers, C60 and C80 inkjet

compresses the h ard copy data, using the current printer format, into a gnuzip ﬁle format, with the extension .gz.The.gzﬁles can be decompressed using PKZIP or WinZip programs.

Color and Gray-Scale Printing. You can print a color hard copy that uses the

splay colors. Gray-scale waveform information is printed as shades of color.

di If you have a Deskjet or Laserjet monochrome printer, gray-scale waveform information is printed as a dithered image.

Ink Saver and Preview. As an alternative to printing the display colors, turn on the Ink Saver function to print a hard copy with a white background. This function saves printer ink while it preserves the color coding of the waveforms and readouts, except for channel 1. Because yellow ink is hard to see on white paper, Ink Saver prints channel 1 using a dark blue ink. Ink saver also works with the monochrome print formats.

Push and hold the Preview screen button to show how the colors will appear on the paper.

Clear Spool. You can push the Clear Spool screen button to empty the print spooler to stop a hard copy operation in progress, if the hard copy port connection is not made due to incompatible settings (such as b aud rate), or if you lose the hard copy port connection before the hard copy is complete.

66 TDS3000C Series Oscilloscope User Manual

Reference

Horizontal Controls

Date and Time St

follow these steps:

1. Push the Utili

2. Push the System bottom button to select Conﬁg.

3. Push the Set Date & Time bottom button.

4. Set the Display Date/Time to On to add the current date and time to the

display screen.

5. Push the Menu Off button.

Printer Error Message. To avoid printer errors, always power on the printer and allow it t If you see a ’Hard copy device not responding’ error message, power the oscilloscope off and then back on, and try to print again. If the printer still does not work, check that the printer is online, you have selected the correct printer format on the oscilloscope, there are no paper jams, and that the printer cable is ﬁrmly connected to the printer and oscilloscope.

o complete its initialization process before powering on the oscilloscope.

amp. To print the current date and time on your hard copies,

ty button.

Horizontal Position Control

Use the horizontal controls to adjust the time base, adjust the trigger location, and

amine waveform details more closely.

to ex

When delay is off, the horizontal Position control moves the trigger point within

acquired waveforms. You can select full pretrigger, full posttrigger, or any

the point in between.

e a pretrigger setting (trigger position near 100% of the record) to acquire

Us waveforms leading up to a trigger event. For example, if you can trigger on an error condition, the waveforms leading up to the error condition might tell you why the error occurred.

Use a p osttrigger setting (trigger position near 0% of the record) when you want to acquire waveforms that follow a trigger event. Use a mid-screen setting when you are interested in information both before and after the trigger event.

TDS3000C Series Oscilloscope User Manual 67

Reference

Refer to the Reference chapter for information about how the horizontal Position control operates when the Delay and Zoom functions are active. (See page 68, Delay Button.) (See page 70, Zoom Button.)

The trigger position is marked with the letter T at the top of the graticule and also in the waveform record icon at the top of the screen.

Delay Button

Trigger marker and horizontal expansion point

Waveform record icon

The small inverted triangle is the horizontal expansion point. When you change the horizontal Scale setting, the waveforms contract or expand about this point. When delay is off, the horizontal expansion point is the same as the trigger point.

Push the Delay button when you want to delay the acquisition relative to the trigger event. Turn the horizontal Position control counterclockwise to increase the delay; the trigger point moves to the left and ultimately outside of the acquired waveform. Then, you can adjust the horizontal Scale to acquire more detail

ound the area of interest (center of the screen).

When delay is on, the trigger point separates from the horizontal expansion point.

he horizontal expansion point stays at the center of the screen. The trigger point

T can move off the screen; when this happens, the trigger marker turns to point in the direction of the trigger point.

68 TDS3000C Series Oscilloscope User Manual

Reference

Usethedelayfeaturewhenyouwanttoacquire waveform detail that is separated from the trigger event by a signiﬁcant interval of time. For example, you can trigger on a sync pulse that occurs once every 10 ms and then look at high-speed signal characteristics that occur 6 ms after the sync pulse.

In the next screen example, the trigger markers show that the trigger point is before the acquired waveform. The delay time, shown in the readout, is the time from the trigger point to the expansion point (center screen).

Delay time readout

The interaction between delay and other functions is summarized in the next table.

Function Delay off Delay on

Trigger point Any point within the acquired

waveform

Expansion point

Horizontal Scale Sets time base Sets time base

Horizontal Position

Same as the trigger point

Sets trigger position in the acquired waveform

Can occur prior to the acquired waveform

Always center screen

Sets delay time

TDS3000C Series Oscilloscope User Manual 69

Reference

Horizontal Sca

Zoom Button

le Control

Use the horizontal Scale control to adjust the time base. When delay is off, the scale expands or contracts around the trigger point. When delay is on, the scale expand chapter includes possible exceptions. (See page 71, Delay Interactions.)

When the zoo the amount of horizontal magniﬁcation (the actual time-base setting remains unchanged). The magniﬁed waveforms always expand or contract around the center of the screen.

Push the zoom button to magnify the current acquisition along the horizontal axis so you can see more detail. Use the horizontal Scale control to adjust the amount of magniﬁcation. Use the horizontal Position control to select the portion of the waveform you want to magnify. When zoom is on, changes you make to these contro

The split screen shows the entire selected waveform in the upper window to give you a p

s or contracts around the center of the screen. The Reference

m function is active, use the horizontal Scale control to adjust

ls do not affect the actual time base or trigger position settings.

oint of reference as you examine the details in the lower window.

Key Poin ts

Actual time base

Zoom time base Zoom position

aximum Zoom Magniﬁcation Factor. If you are using Normal acquisition

resolution, the maximum horizontal magniﬁcation factor is 200X; in Fast-trigger the maximum is 10X.

70 TDS3000C Series Oscilloscope User Manual

Reference

Horizontal Zoo

mandPreview. There are two ways you can magnify a stopped

acquisition, horizontal zoom or preview. The differences in how horizontal zoom and preview interact with other functions are shown in the next table.

Function Horizontal zoom Horizontal preview

Horizontal Scale Sets magniﬁcation factor Changes time base for the

next acquisition

Horizontal Position

Delay button

Math waveform Remains valid; m agniﬁ es

Cursors and automatic measurements

Gray-scale Gray-scale information may

Selects portion of waveform to magnify

Turns delay on and off Turns delay on and off

and positions with other waveforms

Remain functional with valid readouts

be temporarily reduced

Changes trigger position or delay time for the next acquisition

Remains ﬁxed; does not track changes to channel waveforms

Remain locked to channel waveforms

Gray-scale information is lost

Slow Horizontal Settings. At horizontal Scale settings of 40 ms/div or slower, the oscilloscope may display waveforms in roll mode. As the rolling waveform ﬁlls the screen, the waveform intensity and vector ﬁll appears to decrease. The oscilloscope automatically reduces the number of displayed points in order to maintain a high acquisition rate: this does not represent a loss of acquired data.

When you stop the acquisition, the original waveform intensity and vector ﬁll returns to the display.

Using Zoom and Delay Together. You can use both zoom and delay at the same time to magnify a delayed acquisition.

Fast Time-Base Settings. At the fastest time-base settings, only a portion of the waveform shows in the display. The waveform record icon indicates that portion with brackets. Push the zoom

button and then use the horizontal Position control to scroll through the entire waveform to see any portion you want. The affected time-base settings are shown in the next table.

Acquisition resolution Affected time-base settings

Normal

Fast Trigger

100 ns/div to 1 ns/div

4ns/divto1ns/div

At the fastest time-base settings, the maximum zoom magniﬁcation factor is also reduced.

Delay Interactions. The maximum delay setting is a function of the time-base setting and acquisition resolution. If you set a large positive or negative delay,

TDS3000C Series Oscilloscope User Manual 71

Reference

Math and FFT

that amount of d

elay might be automatically reduced if you make the following

additional control changes:

Change to a faster time-base setting

Change from Fast Trigger to Normal acquisition resolution

If the delay reduction occurs, it may cause the waveform horizontal position to shift.

Negative Delay. You can select up to ten d ivisions of negative delay. At the fastest time base settings, you can use negative delay to see more of the waveform that occurs before the trigger point.

Roll Mode Display. To obtain a rolling display similar to a strip-chart recorder, turn off zoom and delay, select the Auto trigger mode, and set the horizontal Scale control to 40 ms/div or slower. Subsequent changes to the horizontal Scale cause the roll-mode display to erase and restart.

Math and FFT functions are part of the Vertical menu group.

Math Waveform

Key Poin ts

Push the Math button to deﬁne the math waveform using the math menu. Also push the Math button to display or select the math waveform. The bottom menu will show other menu items when you have a TDS3AAM application module installed.

Bottom Side Description

Dual Wfm Math

Set 1st Source to Selects the ﬁrst source waveform.

Set Operator to Selects the math operator: +, -, ×,

or ÷

Set 2nd S ource to Selects the second source

waveform.

Dual-Waveform Math. For the dual-waveform math operations, the two source waveforms interact with the math operators in the sequence shown next.

Operation Expression of math waveform

Source 1 + Source 2

Source 1 - Source 2

Source 1 × Source 2

Source 1 ÷ Source 2

72 TDS3000C Series Oscilloscope User Manual

Reference

FFT Waveform

Scaling and Pos

waveform, select the math waveform and then adjust it with a vertical Position or Scale control. You can do this whether acquisition is running or is stopped.

Math Interaction with Preview. If you select a channel waveform and then adjust the vertical Position or Scale control while the acquisition is stopped, the math waveform re waveform. The same is true if you adjust the horizontal Position or Scale control under these conditions.

Gray-Scale Restriction. Math waveforms are always based on the most current acquisitions and do not contain any gray-scale information.

Source Waveform Screen Position. When displaying dual-waveform math waveforms, make sure that the source waveforms do not extend beyond the top or bottom edge of the screen. If part of the source waveform is positioned outside the screen, the math waveform may not display correctly.

The FFT (Fast Fourier Transform) function mathematically converts the standard time-domain signal (repetitive or single-shot acquisition) into its frequency components, providing spectrum analysis capabilities. You can use the FFT function to look at the frequency components and spectrum shape of a signal:

itioning the Math Waveform. To position or scale a math

mains ﬁxed. It does not track the changes you see to the channel

To test impulse response of ﬁlters and systems

To measure harmonic content and distortion in systems

To identify and locate noise and interference sources

To analyze vibration

analyze harmonics in 50 and 60 Hz power lines

The FFT function provides the following features:

FFT Windows – Four FFT windows (Rectangular, Hamming, Hanning, and Blackman-Harris) let you match the optimum window to the signal you are analyzing. The Rectangular window is best for nonperiodic events such as transients, pulses, and one-shot acquisitions. The Hamming, Hanning, and Blackman-Harris windows are better for periodic signals.

Analyze Repetitive, Single-Shot, and Stored Waveforms – You can display an FFT waveform on any actively-acquired signal (periodic or one-shot), on the last acquired signal, or on any signal stored in reference memory.

dB or Linear RMS Scales – The FFT vertical graticule can be set to either dB or Linear RMS. A dB scale is useful when the frequency component magnitudes cover a wide dynamic range, letting you show both lesser and greater- magnitude frequency components on the same display. A Linear

TDS3000C Series Oscilloscope User Manual 73

Reference

scale is useful

when the frequency component magnitudes are all close in

value, allowing direct comparison of their magnitudes.

Time Signals a

nd FFT Waveforms Displayed Together –Thetimesignals

and FFT waveforms can be shown together on the display. The time signal highlights the problem; the FFT waveform helps you determine the cause of the problem.

Displaying an FFT Waveform. To display an FFT waveform, follow these steps:

1. Set the source signal Vertical Scale so that the signal peaks do not go off screen. Off-screen signal peaks can result in FFT waveform errors.

2. Set the Horizontal Scale control to show ﬁve or more cycles of the source signal. Showing more cycles means the FFT waveform shows more frequency compone

nts, provides better frequency resolution, and reduces aliasing. If the signal is a single-shot (transient) signal, make sure that the entire signal (transient event and ringing or noise) is displayed and centered on the screen.

3. Push the Vertical Math button to show the math menu.

4. Push t

Bottom Side Description

FFT

he FFT screen button to show the FFT side menu.

Set FFT Source to Sets the FFT signal source. Valid input sources

h1 and Ch2 (2-channel instruments),

are C Ch1 through Ch4 (4-channel instruments), and Ref1 through Ref4.

Set FFT Vert Scale to Sets the displa y vertical scale units. Available

les are dBV RMS and Linear RMS.

sca

FFT Window to

Set

s which window function (Hanning,

Set Hamming, Blackman-Harris, or Rectangular) to apply to the source signal. (See page 75,

T Windows.)

74 TDS3000C Series Oscilloscope User Manual

Reference

5. Select a signal

source. You can do an FFT on any channel or any stored

reference waveform.

6. Select the app

ropriate vertical scale and FFT window.

7. Use zoom controls and the cursors to magnify and measure the FFT waveform.

FFT Windows. Applying a window function to the source waveform record changes the waveform so that the start and stop values are close to each other, reducing FFT waveform discontinuities. This results in an FFT waveform that more accurately represents the source signal frequency components.

The shape of the FFT window determines how well the window resolves frequency or magnitude information.

FFT window Characteristics Best for measuring

Blackman-Harris Best magnitude, worst at

resolving frequencies.

Predominantly single frequency waveforms to look for higher order harmonics.

TDS3000C Series Oscilloscope User Manual 75

Reference

FFT window Characteristics Best for measuring

Hamming, Hann

Rectangular

ing

Better frequency, poorer magnitude accuracy than Rectangular. has slightly better frequency resolution than Hanning

Best freque magnitude resolution. This is essentially the same as no wi

Hamming

ncy, worst

ndow.

Sine, periodic, and narrow-band random noise.

Transients or levels before and after the event are signiﬁcantly different.

Transients or bursts where the signal levels befo nearly equal.

Equal-amplitude sine waves with frequenci

Broad-band random noise with a relatively slow varying spectrum.

bursts where the signal

re and after the event are

es that are very close.

Aliasing. Problems occur when the oscilloscope acquires a signal containing frequency components that are greater than the Nyquist frequency (1/2 the sample rate). The frequency components that are above the Nyquist frequency are undersampled and appear to "fold back" around the right edge of the graticule, showing as lower frequency components in the FFT waveform. These incorrect components are called aliases.

You can use the following methods to eliminate aliases:

Increase the sample rate by adjusting the Horizontal Scale to a faster frequency setting. Since you increase the Nyquist frequency as you increase the horizontal frequency, the aliased frequency components should appear at their proper frequency. If the increased number of frequency components shown on the screen makes it difﬁcult to measure individual components, push the zoom button

to magnify the FFT w

aveform.

Use a ﬁlter on the source signal to bandwidth limit the signal to frequencies below that of the Nyquist frequency. If the components you are interested in are below the built-in bandwidth settings (20 MHz bandwidth for all

76 TDS3000C Series Oscilloscope User Manual

Reference

oscilloscopes set the source signal bandwidth to the appropriate value. Push the Vertical Menu button to access the source channel bandwidth menu.

, 150 MHz bandwidth for 300 MHz and 500 MHz oscilloscopes),

TDS3000C Series Oscilloscope User Manual 77

Reference

Key Poin ts

FFT Source. To s

elect the source, push the side menu button. Available sources

are the channels and reference wave forms.

Using FFT slow

s down the oscilloscope’s response time in Normal acquisition

mode (10k record length).

A waveform a

cquired in Normal acquisition mode has a lower noise ﬂoor and

better frequency resolution than a waveform acquired in Fast Trigger mode.

Signals tha

t have a DC component or offset can cause incorrect FFT waveform component magnitude values. To minimize the DC component, choose AC Coupling on the source signal.

To reduce random noise and aliased components in repetitive or single-shot events, set the oscilloscope acquisition mode to average over 16 or more samples. Average mode attenuates signals not synchronized with the trigger.

Do not use the Average acquisition mode if the source signal contains frequencies of interest that are not synchronized with the trigger rate.

Do not use Peak Detect a nd Envelope modes with FFT. Peak Detect and Envelope modes can add signiﬁcant distortion to the FFT results.

For transient (impulse, one-shot) signals, set the oscilloscope to trigger on the transient pulse in order to center the pulse information in the waveform record.

FFT Vertical Scale. To select the vertical scale, push the side menu button.

lable scales are dBV RMS and Linear RMS.

Avai

Use the Vertical Position and Scale knobs to vertically move and rescale the

waveform.

FFT

To display FFT waveforms with a large dynamic range, use the dBV RMS

ale. The dBV scale displays component magnitudes using a log scale,

sc expressed in dB relative to 1 V

,where0dB=1V

RMS

or in source

RMS,

waveform units (such as amps for current measurements).

To display FFT waveforms with a small dynamic range, use the Linear RMS scale. The Linear RMS scale lets you display and directly compare components with similar magnitude values.

Nyquist Frequency. To determine the Nyquist frequency, push the Acquire menu button. This displays the current sample rate on the bottom right area of the screen. The Nyquist frequency is one-half of the sample rate. For example, if the sample rate is 25.0 MS/s, then the Nyquist frequency is 12.5 MHz.

Zooming an FFT Display. Use the Zoom button

, along with horizontal Position and Scale controls, to magnify FFT waveforms. When you change the zoom factor, the FFT waveform is horizontally magniﬁed about the center vertical

78 TDS3000C Series Oscilloscope User Manual

Reference

graticule, and

vertically magniﬁed about the math waveform marker. Zooming

does not affect the actual time base or trigger position settings.

NOTE. FFT waveforms are calculated using the entire source waveform record.

Zooming in on a region of either the source or FFT waveform will not recalculate the FFT waveform for that region.

Measuring FFT Waveforms Using Cursors. You can use cursors to take two measurements on FFT waveforms: magnitude (in dB or signal source units) and frequency (in Hz). dB magnitude is referenced to 0 dB, where 0 dB equals 1 V Use horiz

ontal cursors (H Bars) to measure magnitude and vertical cursors (V

RMS

Bars) to measure frequency

Magnitude cursors Frequency cursors

Measur

Push the Meas button to show the measure menu.

Bottom Side Description

Select Measurement

Remove Measurement

Measurement 1 Measurement 2

surement 3

Mea Measurement 4

All Measurements

See the table on automatic measurements. (See page 82.)

Removes a speciﬁc measurement.

oves all measurements.

Rem

TDS3000C Series Oscilloscope User Manual 79

Reference

Bottom Side Description

Gating

High-Low Setup

Reference Levels

Indicators

Off Use to take measurements o n the full

waveform record.

Screen

Cursors

Bring Selec Cursor to Center Screen

Bring Both Cursors On Screen

Auto Sele

Histogr

Min-Max Use to measure other wave shapes.

Set Levels in % or unit

High Re

Mid Re

Mid 2

Low Reference Sets custom low reference level.

Set to Defaults Sets reference levels to default

Measurement 1-

asurement 4

ted

ference

Ref

Use to take measurements on the portion of the waveform on screen.

Use to take measurements on the portion of the waveform between the V Bar cursor

Moves the active cursor to center screen.

Moves any off-screen cursor onto the screen.

Automatically uses the best measurem the signal characteristics.

Usetome

Use to choose custom reference

in relative or absolute units.

levels

stom high reference level.

Sets cu

ustom mid reference level.

Sets c

the custom mid reference

Sets level for the Delay and Phase measurement second waveform.

ues.

val

lects the measurement for which to

Se display markers that show the portion of the waveform used to calculate the

asurement value.

urns measurement indicators off.

ent method depending on

asure pulses.

Key Poin ts

Choosing Measurements. You can perform up to four automatic measurements

and display them along the right side of the graticule. All four measurements can apply to a single channel or you can spread the measurements over several channels. You can also take measurements on math and reference waveforms.

First push a channel, Math, or Ref button to select the waveform you want to measure and then select a measurement. (See page 82, Automatic Measurements.)

80 TDS3000C Series Oscilloscope User Manual

Tektronix TDS3000C Series, TDS3012C, TDS3014C, TDS3032C, TDS3034C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual