Tektronix TDS 744A, TDS 784A, TDS 684A User Manual

User Manual

TDS 684A, TDS 744A & TDS 784A

Digitizing Oscilloscopes

070-8991-02

This document applies for firmware version 1.0 and above.

Copyright Tektronix, Inc. 1994. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions.

Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the Commercial Computer Software ± Restricted Rights clause at FAR 52.227-19, as applicable.

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

Printed in the U.S.A.

Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070±1000

TEKTRONIX, TEK, FastFrame , FlexFormat , and InstaVu are registered trademarks of Tektronix, Inc.

WARRANTY

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; or c) 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 THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

German Postal Information

Certificate of the Manufacturer/Importer

We hereby certify that the TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes and all factory-installed options comply with the RF Interference Suppression requirements of Postal Regulation Vfg. 243/1991, amended per Vfg. 46/1992.

The German Postal Service was notified that the equipment is being marketed.

The German Postal Service has the right to re-test the series and to verify that it complies.

TEKTRONIX

Bescheinigung des Herstellers/Importeurs

Hiermit wird bescheinigt, daû das TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes und alle fabrikinstallierten Optionen in Übereinstimmung mit den Bestimmungen der Amtsblatt-Verfügung Vfg. 243/1991 und Zusatzverfügung 46/1992 funkentstört sind.

Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerätes angezeigt und die Berechtigung zur Überprüfung der Serie auf Einhalten der Bestimmungen eingeräumt.

TEKTRONIX

NOTICE to the user/operator:

The German Postal Service requires that systems assembled by the operator/user of this instrument must also comply with Postal Regulation, Vfg. 243/1991, Par. 2, Sect. 1.

HINWEIS für den Benutzer/Betreiber:

Die vom Betreiber zusammengestellte Anlage, innerhalb derer dieses Gerät eingesetzt wird, muû ebenfalls den Voraussetzungen nach Par. 2, Ziff. 1 der Vfg. 243/1991, genügen.

NOTICE to the user/operator:

The German Postal Service requires that this equipment, when used in a test setup, may only be operated if the requirements of Postal Regulation, Vfg. 243/1991, Par. 2, Sect. 1.8.1 are complied with.

HINWEIS für den Benutzer/Betreiber:

Dieses Gerät darf in Meûaufbauten nur betrieben werden, wenn die Voraussetzungen des Par. 2, Ziff. 1. 8.1 der Vfg. 243/1991 eingehalten werden.

EC Declaration of Conformity

We

Tektronix Holland N.V.

Marktweg 73A

8444 AB Heerenveen

The Netherlands

declare under sole responsibility that the

TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes

meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was demonstrated to the following specifications as listed in the official Journal of the European Communities:

EN 50081±1 Emissions:
EN 55022	Radiated, Class B
EN 55022	Radiated, Class B
EN 60555±2	Power Harmonics
EN 50082±1 Immunity:
IEC 801±2	Electrostatic Discharge
IEC 801±3	RF Radiated
IEC 801±4	Fast Transients
IEC 801±5	Surge

Table of Contents

General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	ix
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xiii
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xiii
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xiv
Default Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	xiv
Getting Started

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1±1
Product Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1±2
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1±3
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1±3
Putting into Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1±4
Operating Basics
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±1
Operating Interface Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±3
Tutorial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±9
Setting Up for the Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±9
Example 1: Displaying a Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±13
Example 2: Displaying Multiple Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±15
Example 3: Taking Automated Measurements . . . . . . . . . . . . . . . . . . . . . . . . . .	2±19
Example 4: Saving Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±24
Reference
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±1
Acquiring and Displaying Waveforms . . . . . . . . . . . . . . . . . . . . . . . . .	3±3
Coupling Waveforms to the Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±3
Setting up Automatically: Autoset and Reset . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±5
Selecting Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±7
Scaling and Positioning Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±9
Choosing an Acquisition Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±16
Customizing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±27
Customizing the Display Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±33
Zooming on Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±37
Using InstaVu Acquisition Mode (TDS 700A Models Only) . . . . . . . . . . . . . . .	3±43
Using FastFrame (TDS 700A Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±46
Triggering on Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±49
Triggering Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±49
Triggering from the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±53
Triggering on a Waveform Edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±57
Triggering Based on Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±60
Triggering on Pulses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±70

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Delayed Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3±80

Measuring Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±87
Taking Automated Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±87
Taking Cursor Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±97
Taking Graticule Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±101
Optimizing Measurement Accuracy: SPC and Probe Cal . . . . . . . . . . . . . . . . . .	3±102

Saving Waveforms and Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±111
Saving and Recalling Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±111
Saving and Recalling Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±114
Managing the File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±117
Printing a Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±120
Communicating with Remote Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±128

Determining Status and Accessing Help . . . . . . . . . . . . . . . . . . . . . . . .	3±133
Displaying Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±133
Displaying Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±135
Using Features for Advanced Applications . . . . . . . . . . . . . . . . . . . . . .	3±137
Limit Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±137
Waveform Math . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±142
Fast Fourier Transforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±144
Waveform Differentiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±161
Waveform Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±165
Appendices
Appendix A: Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . .	A±1
Appendix B: Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	B±1
Appendix C: Packaging for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . .	C±1
Appendix D: Factory Initialization Settings . . . . . . . . . . . . . . . . . . . . .	D±1
Appendix E: Probe Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	E±1

Glossary

Index

ii	TDS 684A, TDS 744A, & TDS 784A User Manual

Table of Contents

List of Figures

Figure 1±1: Rear Panel Controls Used in Start Up . . . . . . . . . . . . . . .	1±4
Figure 1±2: ON/STBY Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1±5
Figure 2±1: Connecting a Probe for the Examples (P6245 shown) . .	2±9
Figure 2±2: SETUP Button Location . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±10
Figure 2±3: The Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±10
Figure 2±4: Trigger Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±11
Figure 2±5: The Display After Factory Initialization . . . . . . . . . . . . .	2±12
Figure 2±6: The VERTICAL and HORIZONTAL Controls . . . . . . .	2±13
Figure 2±7: TRIGGER Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±14
Figure 2±8: AUTOSET Button Location . . . . . . . . . . . . . . . . . . . . . . . .	2±14
Figure 2±9: The Display After Pressing Autoset . . . . . . . . . . . . . . . . .	2±15
Figure 2±10: Display Signals Requiring Probe Compensation . . . . . .	2±15
Figure 2±11: The Channel Buttons and Lights . . . . . . . . . . . . . . . . . . .	2±16
Figure 2±12: The Vertical Main Menu and Coupling Side Menu . . . .	2±17
Figure 2±13: The Menus After Changing Channels . . . . . . . . . . . . . .	2±18
Figure 2±14: Measure Main Menu and Select Measurement
Side Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±20
Figure 2±15: Four Simultaneous Measurement Readouts . . . . . . . . .	2±21
Figure 2±16: General Purpose Knob Indicators . . . . . . . . . . . . . . . . .	2±22
Figure 2±17: Snapshot of Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . .	2±23
Figure 2±18: Save/Recall Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . .	2±25
Figure 3±1: How Probe Compensation Affects Signals . . . . . . . . . . . .	3±4
Figure 3±2: P6139A Probe Adjustment . . . . . . . . . . . . . . . . . . . . . . . . .	3±4
Figure 3±3: The Channel Readout . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±8
Figure 3±4: Waveform Selection Priority . . . . . . . . . . . . . . . . . . . . . . .	3±9
Figure 3±5: Scaling and Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±10
Figure 3±6: Vertical Readouts and Channel Menu . . . . . . . . . . . . . . .	3±11
Figure 3±7: Record View and Time Base Readouts . . . . . . . . . . . . . . .	3±13
Figure 3±8: Horizontal Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±14
Figure 3±9: Acquisition: Input Analog Signal, Sample,
and Digitize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±17
Figure 3±10: Several Points May be Acquired for Each
Point Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±17

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Figure 3±11: Real-Time Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±17
Figure 3±12: Equivalent-Time Sampling . . . . . . . . . . . . . . . . . . . . . . .	3±18
Figure 3±13: How the Acquisition Modes Work . . . . . . . . . . . . . . . . .	3±21
Figure 3±14: Acquisition Menu and Readout . . . . . . . . . . . . . . . . . . . .	3±23
Figure 3±15: Acquire Menu Ð Stop After . . . . . . . . . . . . . . . . . . . . . .	3±25
Figure 3±16: Aliasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±27
Figure 3±17: Display Menu Ð Style . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±29
Figure 3±18: Trigger Point and Level Indicators . . . . . . . . . . . . . . . . .	3±30
Figure 3±19: Display Menu Ð Setting . . . . . . . . . . . . . . . . . . . . . . . . .	3±33
Figure 3±20: Display Menu Ð Palette Colors . . . . . . . . . . . . . . . . . . .	3±35
Figure 3±21: Display Menu Ð Map Reference Colors . . . . . . . . . . . .	3±36
Figure 3±22: Display Menu Ð Restore Colors . . . . . . . . . . . . . . . . . . .	3±37
Figure 3±23: Zoom Mode with Horizontal Lock Set to None . . . . . . .	3±39
Figure 3±24: Dual Window (Preview) Mode . . . . . . . . . . . . . . . . . . . . .	3±41
Figure 3±25: Dual Zoom Ð Shown in Dual Window (Preview)
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±42
Figure 3±26: Normal DSO Acquisition and Display Mode Versus InstaVu
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±44
Figure 3±27: InstaVu Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±45
Figure 3±28: Fast Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±46
Figure 3±29: Horizontal Menu Ð FastFrame Setup . . . . . . . . . . . . . .	3±47
Figure 3±30: Triggered Versus Untriggered Displays . . . . . . . . . . . . .	3±49
Figure 3±31: Trigger Holdoff Time Ensures Valid Triggering . . . . . .	3±52
Figure 3±32: Slope and Level Controls Help Define the Trigger . . . .	3±53
Figure 3±33: TRIGGER Controls and Status Lights . . . . . . . . . . . . . .	3±54
Figure 3±34: Example Trigger Readouts Ð Edge Trigger
Selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±56
Figure 3±35: Record View, Trigger Position, and Trigger Level Bar
Readouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±56
Figure 3±36: Edge Trigger Readouts . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±57
Figure 3±37: Main Trigger Menu Ð Edge Type . . . . . . . . . . . . . . . . .	3±58
Figure 3±38: Violation Zones for Setup/Hold Triggering . . . . . . . . . .	3±63
Figure 3±39: Logic Trigger Readouts Ð State Class Selected . . . . . .	3±64
Figure 3±40: Logic Trigger Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±65
Figure 3±41: Logic Trigger Menu Ð Time Qualified TRUE . . . . . . .	3±67
Figure 3±42: Triggering on a Setup/Hold Time Violation . . . . . . . . . .	3±70
Figure 3±43: Pulse Trigger Readouts . . . . . . . . . . . . . . . . . . . . . . . . . .	3±71
Figure 3±44: Main Trigger Menu Ð Glitch Class . . . . . . . . . . . . . . . .	3±73
Figure 3±45: Main Trigger Menu Ð Runt Class . . . . . . . . . . . . . . . . .	3±75

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Table of Contents

Figure 3±46: Main Trigger Menu Ð Slew Rate Class . . . . . . . . . . . . .	3±79
Figure 3±47: Delayed Runs After Main . . . . . . . . . . . . . . . . . . . . . . . . .	3±81
Figure 3±48: Delayed Triggerable . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±81
Figure 3±49: How the Delayed Triggers Work . . . . . . . . . . . . . . . . . . .	3±82
Figure 3±50: Delayed Trigger Menu . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±84
Figure 3±51: Graticule, Cursor and Automated Measurements . . . .	3±87
Figure 3±52: Measurement Readouts . . . . . . . . . . . . . . . . . . . . . . . . . .	3±90
Figure 3±53: Measure Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±91
Figure 3±54: Measure Menu Ð Gating . . . . . . . . . . . . . . . . . . . . . . . . .	3±92
Figure 3±55: Measure Menu Ð Reference Levels . . . . . . . . . . . . . . . .	3±93
Figure 3±56: Measure Delay Menu Ð Delay To . . . . . . . . . . . . . . . . . .	3±94
Figure 3±57: Snapshot Menu and Readout . . . . . . . . . . . . . . . . . . . . . .	3±96
Figure 3±58: Cursor Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±97
Figure 3±59: Cursor Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±98
Figure 3±60: H Bars Cursor Menu and Readouts . . . . . . . . . . . . . . . .	3±99
Figure 3±61: Paired Cursor Menu and Readouts . . . . . . . . . . . . . . . .	3±100
Figure 3±62: Performing a Signal Path Compensation . . . . . . . . . . . .	3±104
Figure 3±63: Probe Cal Menu and Gain Compensation Display . . . .	3±106
Figure 3±64: Re-use Probe Calibration Data Menu . . . . . . . . . . . . . . .	3±108
Figure 3±65: Save/Recall Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . .	3±112
Figure 3±66: Save Waveform Menu . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±115
Figure 3±67: More Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±116
Figure 3±68: File Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±118
Figure 3±69: File System Ð Labeling Menu . . . . . . . . . . . . . . . . . . . . .	3±119
Figure 3±70: Utility Menu Ð System I/O . . . . . . . . . . . . . . . . . . . . . . .	3±122
Figure 3±71: Hardcopy Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±123
Figure 3±72: Date and Time Display . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±124
Figure 3±73: Connecting the Oscilloscope Directly to the
Hardcopy Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±125
Figure 3±74: Connecting the Oscilloscope and
Hardcopy Device Via a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±127
Figure 3±75: Typical GPIB Network Configuration . . . . . . . . . . . . . .	3±129
Figure 3±76: Stacking GPIB Connectors . . . . . . . . . . . . . . . . . . . . . . .	3±130
Figure 3±77: Connecting the Oscilloscope to a Controller . . . . . . . . .	3±131
Figure 3±78: Utility Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±132
Figure 3±79: Status Menu Ð System . . . . . . . . . . . . . . . . . . . . . . . . . .	3±134
Figure 3±80: Banner Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±134
Figure 3±81: Initial Help Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±135
Figure 3±82: Comparing a Waveform to a Limit Template . . . . . . . .	3±137

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Table of Contents

Figure 3±83: Acquire Menu Ð Create Limit Test Template . . . . . . . .	3±139
Figure 3±84: More Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±142
Figure 3±85: Dual Waveform Math Main and Side Menus . . . . . . . .	3±143
Figure 3±86: System Response to an Impulse . . . . . . . . . . . . . . . . . . . .	3±146
Figure 3±87: Define FFT Waveform Menu . . . . . . . . . . . . . . . . . . . . . .	3±147
Figure 3±88: FFT Math Waveform in Math1 . . . . . . . . . . . . . . . . . . . .	3±148
Figure 3±89: Cursor Measurement of an FFT Waveform . . . . . . . . . .	3±150
Figure 3±90: Waveform Record vs. FFT Time Domain Record . . . . .	3±151
Figure 3±91: FFT Time Domain Record vs.
FFT Frequency Domain Record . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±152
Figure 3±92: How Aliased Frequencies Appear in an FFT . . . . . . . . .	3±156
Figure 3±93: Windowing the FFT Time Domain Record . . . . . . . . . .	3±159
Figure 3±94: FFT Windows and Bandpass Characteristics . . . . . . . .	3±161
Figure 3±95: Derivative Math Waveform . . . . . . . . . . . . . . . . . . . . . . .	3±163
Figure 3±96: Peak-Peak Amplitude Measurement of a
Derivative Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±164
Figure 3±97: Integral Math Waveform . . . . . . . . . . . . . . . . . . . . . . . . .	3±167
Figure 3±98: H Bars Cursors Measure an Integral Math Waveform	3±168
Figure B±1: MCross Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	B±4
Figure B±2: Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	B±7
Figure B±3: Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	B±11
Figure B±4: Choosing Minima or Maxima to Use for
Envelope Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	B±13
Figure E±1: Typical High Voltage Probes . . . . . . . . . . . . . . . . . . . . . . .	E±2
Figure E±2: A6303 Current Probe Used in the AM 503S Opt. 03 . . .	E±4

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Table of Contents

List of Tables

Table 1±1: Key Features of the TDS Oscilloscopes . . . . . . . . . . . . . . .	1±1
Table 1±2: Fuse and Fuse Cap Part Numbers . . . . . . . . . . . . . . . . . . .	1±5
Table 3±1: Autoset Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±6
Table 3±2: How Interleaving Affects Sample Rate . . . . . . . . . . . . . . . .	3±19
Table 3±3: Additional Resolution Bits . . . . . . . . . . . . . . . . . . . . . . . . .	3±22
Table 3±4: TDS 744A Sampling Mode Selection
(When Fit to Screen is Off) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±24
Table 3±5: TDS 784A Sampling Mode Selection
(When Fit to Screen is Off) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±25
Table 3±6: XY Format Pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±32
Table 3±7: Pattern and State Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±62
Table 3±8: Pulse Trigger Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±71
Table 3±9: Measurement Definitions . . . . . . . . . . . . . . . . . . . . . . . . . .	3±88
Table 3±10: Probe Cal Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3±109
Table A±1: Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	A±1
Table A±2: Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	A±3
Table A±3: Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	A±4
Table A±4: Accessory Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	A±5
Table D±1: Factory Initialization Defaults . . . . . . . . . . . . . . . . . . . . . .	D±1

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Table of Contents

viii	TDS 684A, TDS 744A, & TDS 784A 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.
	Only qualified personnel should perform service procedures.
Injury Precautions
Use Proper Power Cord	To avoid fire hazard, use only the power cord specified for this product.
Avoid Electric Overload	To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is
	outside the range specified for that terminal.
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.
Do Not Operate Without	To avoid electric shock or fire hazard, do not operate this product with covers or
Covers	panels removed.
Use Proper Fuse	To avoid fire hazard, use only the fuse type and rating specified for this product.
Do Not Operate in	To avoid electric shock, do not operate this product in wet or damp conditions.
Wet/Damp Conditions
Do Not Operate in	To avoid injury or fire hazard, do not operate this product in an explosive
Explosive Atmosphere	atmosphere.
Keep Probe Surface Clean	To avoid electric shock and erroneous readings, keep probe surface clean.

Product Damage Precautions

Use Proper Power Source Do not operate this product from a power source that applies more than the voltage specified.

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General Safety Summary

Provide Proper Ventilation	To prevent product overheating, provide proper ventilation.
Do Not Operate With	If you suspect there is damage to this product, have it inspected by qualified
Suspected Failures	service personnel.
Do Not Immerse in Liquids	Clean the probe using only a damp cloth. Refer to cleaning instructions.

Safety Terms and Symbols

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

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

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

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

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

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

CAUTION indicates a hazard to property including the product.

x	TDS 684A, TDS 744A, & TDS 784A User Manual

General Safety Summary

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

DANGER	Protective Ground	ATTENTION	Double
High Voltage	(Earth) Terminal	Refer to	Insulated
		Manual

Certifications and Compliances

CSA Certified Power CSA Certification includes the products and power cords appropriate for use in Cords the North America power network. All other power cords supplied are approved

for the country of use.

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General Safety Summary

xii	TDS 684A, TDS 744A, & TDS 784A User Manual

Preface

This is the User Manual for the TDS 684A, TDS 744A, and TDS 784A

Digitizing Oscilloscopes.

The chapter Getting Started briefly describes the TDS Oscilloscope, prepares you to install it, and tells you how to put it into service.

The chapter Operating Basics covers basic principles of the operation of the oscilloscope. The operating interface illustrations and the tutorial examples rapidly help you understand how your oscilloscope operates.

The chapter Reference teaches you how to perform specific tasks. See page 3±1 for a complete list of operating tasks covered in that chapter.

The Appendices provide an options listing, an accessories listing, and other useful information.

Related Manuals

The following documents are related to the use or service of the oscilloscope.

HThe TDS Family Digitizing Oscilloscopes Programmer Manual (Tektronix part number 070-8709-xx) describes using a computer to control the oscilloscope through the GPIB interface.

HThe TDS 684A, TDS 744A, & TDS 784A Reference (Tektronix part number 070-8999-xx) gives you a quick overview of how to operate the oscilloscope.

HThe TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications (Tektronix part number 070-8990-xx) tells how to verify the performance of the oscilloscope and lists its specifications.

HThe TDS Family Option 05 Video Trigger Instruction Manual (Tektronix part number 070-8748-xx) describes use of the video trigger option (for TDS oscilloscopes equipped with that option only).

HThe TDS 684A, TDS 744A, & TDS 784A Service Manual (Tektronix part number 070-8992-xx) provides information for maintaining and servicing the oscilloscope to the module level.

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Preface

Conventions

In this manual, you will find various procedures which contain steps of instructions for you to perform. To keep those instructions clear and consistent, this manual uses the following conventions:

HIn procedures, names of front panel controls and menu labels appear in boldface print.

HNames also appear in the same case (initial capitals or all uppercase) in the manual as is used on the oscilloscope front panel and menus. Front panel names are all upper case letters, for example, VERTICAL MENU and CH 1.

HInstruction steps are numbered. The number is omitted if there is only one step.

HWhen steps require that you make a sequence of selections using front panel controls and menu buttons, an arrow ( ) marks each transition between a front panel button and a menu, or between menus. Also, whether a name is a main menu or side menu item is clearly indicated: Press VERTICAL MENU Coupling (main) DC (side) Bandwidth (main)

250 MHz (side).

Using the convention just described results in instructions that are graphically intuitive and simplifies procedures. For example, the instruction just given replaces these five steps:

1.Press the front panel button VERTICAL MENU.

2.Press the main-menu button Coupling.

3.Press the side-menu button DC.

4.Press the main-menu button Bandwidth.

5.Press the side-menu button 250 MHz.

Sometimes you may have to make a selection from a pop-up menu: Press TRIGGER MENU Type (main) Edge (pop-up). In this example, you repeatedly press the main menu button Type until Edge is highlighted in the pop-up menu.

Default Model

This manual documents the TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes. However, the TDS 684A display screen appears as the default screen wherever a display screen is illustrated in this manual. Also, this manual uses the name ªTDS 700Aº when providing information common to both the TDS 744A and TDS 784A model oscilloscopes.

xiv	TDS 684A, TDS 744A, & TDS 784A User Manual

Product Description

The Tektronix TDS Oscilloscope is a superb tool for acquiring, displaying, and measuring waveforms. Its performance addresses the needs of both benchtop lab and portable applications with the following features:

Table 1±1: Key Features of the TDS Oscilloscopes

Feature

TDS 684A

TDS 744A

TDS 784A

Digitizing rate, maxi-

5 GS/s on each chan-

2 GS/s

4 GS/s

mum

nel simultaneously

Analog bandwidth

1 GHz

500 MHz

1 GHz

Channels

Four, each with 8-bit resolution

Record lengths, maxi-

15 K samples per

Up to 50 K standard, up to 250 K (2 channels)

mum

channel

and 500 K (1 channel) with Option 1M

Acquisition modes

Sample, envelope,

Sample, envelope, average, high-resolution,

and average

and peak-detect

InstaVuTM mode, which updates the display at

rates rivaling the fastest analog oscilloscopes

Display

Color

Color

Zoom, which allows

Dual Window Zoom, which shows a waveform

you to magnify a

magnified and unmagnified on the same

waveform

display

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Product Description

Table 1±1: Key Features of the TDS Oscilloscopes (Cont.)

Feature	TDS 684A	TDS 744A	TDS 784A
Trigger modes	Include: edge, logic, and pulse. Video trigger, with option 05, modes
	include:
	NTSC, SECAM, PAL, HDTV, and FlexFormatT.
Storage	1.44 Mbyte, 3.5 inch, DOS 3.3-or-later floppy disk.
	NVRAM storage for saving waveforms, hardcopies, and setups
I/O	Full GPIB programmability.
	Hardcopy output using GPIB, RS-232, or Centronics ports

Product Specification

The product specification is found in the technical reference TDS 684A,

TDS 744A, & TDS 784A Performance Verification and Specifications that is shipped as a standard accessory with the TDS Oscilloscope.

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Start Up

Before you use the TDS Oscilloscope, ensure that it is properly installed and powered on.

Preparation

To ensure maximum accuracy for your most critical measurements, you should know about signal path compensation and the proper use of the probe you choose to use with your oscilloscope.

Signal Path Compensation Be sure you compensate your oscilloscope for the surrounding temperature. This action, called Signal Path Compensation (SPC), ensures maximum possible accuracy for your most critical measurements. See Signal Path Compensation on page 3±102 for a description of and operating information on this feature.

Recommended Probes The TDS 744A Oscilloscope ships with four general-purpose, P6139A 500 MHz passive probes. The TDS 684A and TDS 784A Oscilloscopes ship without probes. To take advantage of the higher bandwidth of the TDS 684A and

TDS 784A Oscilloscopes, order the P6245 Active Probe. See Appendix A: Options and Accessories in this manual for more information on optional-acces- sory probes for all three oscilloscope models.

Probe Usage Be sure you use the appropriate probe for the measurement. For instance, do not use the P6245 Active Probe to measure signals greater than ±8 volts or with more than ±10 volts of offset since errors in signal measurement will result. (See the User manual for the probe for more information.) Instead, use a passive probe, such as P6139A passive probe, that allows higher voltage measurements. The P6139A probe is for measurements up to ±500 volts.

CAUTION. Using the P6245 Active Probe to measure signals greater than

±40 volts may damage the probe.

Input Coupling Be sure to choose the proper input coupling and impedance for the probe or other cabling you use to couple signals to your oscilloscope. You should read Input Impedance Considerations on page 3±5 for information needed to ensure proper coupling of your input signals.

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Start Up

Putting into Service

To learn how to install, access the front panel, power on, do a self test, and power off the oscilloscope, do the following procedures:

Installation To properly install and power on the oscilloscope, do the following steps:

1.Be sure you have the appropriate operating environment. Specifications for temperature, relative humidity, altitude, vibrations, and emissions are included in the TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications manual (Tektronix part number 070-8990-xx).

2.Leave space for cooling. Do this by verifying that the air intake and exhaust holes on the sides of the cabinet (where the fan operates) are free of any airflow obstructions. Leave at least 5.1 cm (2 inches) free on each side.

WARNING. To avoid electrical shock, be sure that the power cord is disconnected before checking the fuse.

3.Check the fuse to be sure it is the proper type and rating (see Figure 1±1). You can use either of two fuses. Each fuse requires its own cap (see

Table 1±2). The oscilloscope is shipped with the UL approved fuse installed.

4.Check that you have the proper electrical connections. The oscilloscope

requires 90 to 250 VACRMS, continuous range, 45 Hz to 440 Hz, and may require up to 300 W.

5.Connect the proper power cord from the rear-panel power connector (see Figure 1±1) to the power system.

Power Connector

Principal Power Switch

Fuse

Figure 1±1: Rear Panel Controls Used in Start Up

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Start Up

Table 1±2: Fuse and Fuse Cap Part Numbers

		Fuse Cap
Fuse	Fuse Part Number	Part Number
0.25 inch ×1.25 inch (UL 198.6, 3AG): 6 A	159-0013-00	200-2264-00
FAST, 250 V.
5 mm ×20 mm (IEC 127): 5 A (T), 250 V.	159-0210-00	200-2265-00

Front Cover Removal To remove the front cover, grasp its left and right edges and snap it off of the front subpanel. (To reinstall it, align it to the front subpanel and snap it back on.)

Power On To power on the oscilloscope, do the following steps:

1.Check that the rear-panel principal power switch is on (see Figure 1±1). The principal power switch controls all AC power to the instrument.

2.If the oscilloscope is not powered on (the screen is blank), push the front-panel ON/STBY button to toggle it on (see Figure 1±2).

ON/STBY Button

Figure 1±2: ON/STBY Button

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1±5

Start Up

The ON/STBY button controls power to most of the instrument circuits. Power continues to go to certain parts even when this switch is set to STBY.

Once the oscilloscope is installed, it is typical to leave the principal power switch on and use the ON/STBY button instead of the power switch.

Self Test The oscilloscope automatically performs power-up tests each time it is turned on. It will come up with a display screen that states whether or not it passed the self test. To determine the self test results, check the screen. (If the self test passed, the status display screen will be removed after a few seconds.)

If the self test fails, call your local Tektronix Service Center. Depending on the type of failure, you may still be able to use the oscilloscope before it is serviced.

Power Off To power off the oscilloscope, toggle the ON/STBY switch.

1±6	TDS 684A, TDS 744A, & TDS 784A User Manual

Overview

This chapter describes the basic concepts of operating the TDS Oscilloscope. Understanding the basic concepts of your oscilloscope will help you use it much more effectively.

The first section, Operating Interface Maps, quickly shows you how the oscilloscope controls are organized and where you can read about them. It also illustrates the general procedures for operating the menu system. This section includes the titles:

HFront Panel Map

HRear Panel Map

HDisplay Map

HTo Operate a Menu

HTo Operate a Pop-Up Menu

The second section, Tutorial, contains example procedures that lead you through the fundamental tasks needed to display a waveform measurement. It also includes an example procedure that teaches you how to store a setup of the oscilloscope controls for later use. This section includes the following tuto-

rial examples:

HSetting Up for the Examples

HExample 1: Displaying a Waveform

HExample 2: Displaying Multiple Waveforms

HExample 3: Taking Automated Measurements

HExample 4: Saving Setups

To explore these topics in more depth and to read about topics not covered in this section, see Reference. A list of the topics covered begins on Page 3±1.

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Overview

2±2	TDS 684A, TDS 744A, & TDS 784A User Manual