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User Manual

TDS 340A, TDS 360 & TDS 380 Digital Real-Time Oscilloscopes 070-9459-04

Copyright E Tektronix, Inc. 1995. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070­1000 TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three (3) years from the date of shipment. If a 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; 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 IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Table of Contents
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii xi

Getting Started
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Line Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1­2 1­3 1­5 1­7

Operating Basics
Display and Power Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vertical Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Horizontal Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Miscellaneous Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear-Panel Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using Autoset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2­1 2­2 2­3 2­4 2­5 2­6 2­7 2­8 2­9 2­12 2­15

Reference
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manipulating Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Horizontal Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Displaying Math Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­1 3­3
3­3 3­6 3­8

Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Edge Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Video Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­11
3­11 3­14

Taking Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automated Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Taking Measurements with Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­17
3­17 3­21

Controlling Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlling the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the FFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Considerations for Using FFTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­25 3­27 3­31
3­31 3­32 3­36

Making Hard Copies (Option 14 Equipped Instruments Only) . . . . .
Configuring Hard Copy Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Saving a Hard Copy to Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­41
3­41 3­43

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Saving and Recalling Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Reference Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Viewing a Waveform on a Spreadsheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­45
3­45 3­47 3­49

Saving and Recalling Front-Panel Setups . . . . . . . . . . . . . . . . . . . . . . .
Using Internal Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­51
3­52 3­52

Using the File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the Utility Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3­55 3­59
3­60

Appendices
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranted Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Typical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nominal Traits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A­1
A­1 A­5 A­7

Appendix B: Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance Test Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signal Acquisition System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time Base System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trigger System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sine Wave Generator Leveling Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B­1
B­1 B­3 B­4 B­5 B­5 B­10 B­11 B­14

Appendix C: Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . .
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessory Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessory Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C­1
C­1 C­3 C­3 C­4 C­4

Appendix D: General Care and Cleaning . . . . . . . . . . . . . . . . . . . . . . .
General Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D­1
D­1 D­1

Glossary Index

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List of Figures
Figure 1­1: The ON/STBY button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 1­2: Line fuse removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 1­3: Verifying adjustments and signal path compensation . . . Figure 1­4: Hookup for functional test . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2­1: Using menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2­2: A pop-up menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2­3: Connecting a probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2­4: Probe compensation setup . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2­5: Compensation waveform . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2­6: How probe compensation affects signals . . . . . . . . . . . . . Figure 2­7: Location of probe compensation adjustment . . . . . . . . . . Figure 2­8: The AUTOSET button . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­1: The VERTICAL MENU button . . . . . . . . . . . . . . . . . . . . Figure 3­2: The vertical menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­3: Inverting a waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­4: The HORIZONTAL MENU button . . . . . . . . . . . . . . . . . Figure 3­5: The horizontal menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­6: The MATH button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­7: A math waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­8: The TRIGGER MENU button . . . . . . . . . . . . . . . . . . . . . Figure 3­9: The edge trigger menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­10: The video trigger menu . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­11: The video scan-rate menu . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­12: The MEASURE button . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­13: The measure menu and active measurements . . . . . . . . Figure 3­14: The CURSOR button . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­15: The cursor menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­16: Paired cursor measurements of a sine wave . . . . . . . . . . Figure 3­17: The ACQUIRE button . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­18: The acquire menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­19: The DISPLAY button . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­20: The display menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­21: System response to an impulse . . . . . . . . . . . . . . . . . . . . Figure 3­22: Define FFT waveform menu . . . . . . . . . . . . . . . . . . . . . . 1­3 1­4 1­6 1­7 2­10 2­11 2­12 2­13 2­13 2­14 2­14 2­15 3­3 3­4 3­5 3­6 3­6 3­8 3­9 3­11 3­12 3­14 3­15 3­17 3­18 3­22 3­22 3­23 3­25 3­25 3­27 3­27 3­32 3­33

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Figure 3­23: Cursor measurement of an FFT waveform . . . . . . . . . . Figure 3­24: FFT time domain record vs. FFT frequency domain record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­25: How aliased frequencies appear in an FFT . . . . . . . . . . Figure 3­26: Windowing the FFT time domain record . . . . . . . . . . . . Figure 3­27: The HARDCOPY button . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­28: The UTILITY button . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­29: The system I/O menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­30: The reference waveform buttons . . . . . . . . . . . . . . . . . . . Figure 3­31: A reference waveform menu . . . . . . . . . . . . . . . . . . . . . . Figure 3­32: Save Format menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­33: The SAVE/RECALL button . . . . . . . . . . . . . . . . . . . . . . . Figure 3­34: The save/recall menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­35: File utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­36: File system -- Labelling menu . . . . . . . . . . . . . . . . . . . . . Figure 3­37: The UTILITY button . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­38: The utility pop-up menu . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3­39: Date and time display . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure A­1: TDS 340A, TDS 360, and TDS 380 dimensions . . . . . . . . Figure B­1: Menu locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure B­2: Hookup for DC voltage measurement accuracy check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure B­3: Hookup for analog bandwidth check . . . . . . . . . . . . . . . . Figure B­4: Measuring analog bandwidth . . . . . . . . . . . . . . . . . . . . . . Figure B­5: Hookup for sample rate check . . . . . . . . . . . . . . . . . . . . . Figure B­6: Hookup for trigger sensitivity check . . . . . . . . . . . . . . . . Figure B­7: Measuring trigger sensitivity . . . . . . . . . . . . . . . . . . . . . . Figure B­8: Hookup for sine wave generator leveling . . . . . . . . . . . . .

3­35 3­36 3­38 3­39 3­41 3­42 3­42 3­45 3­46 3­48 3­51 3­51 3­55 3­57 3­59 3­60 3­61 A­11 B­2 B­6 B­8 B­9 B­10 B­12 B­13 B­15

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List of Tables
Table 2­1: Autoset defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 3­1: Measurement definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . Table A­1: Warranted characteristics -- signal acquisition system . Table A­2: Warranted characteristics -- time base system . . . . . . . . Table A­3: Warranted characteristics -- triggering system . . . . . . . Table A­4: Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table A­5: Warranted characteristics -- environmental . . . . . . . . . . Table A­6: Typical characteristics -- signal acquisition system . . . . Table A­7: Typical characteristics -- triggering system . . . . . . . . . . Table A­8: Typical characteristics -- probe compensator output . . . Table A­9: Typical characteristics -- data handling . . . . . . . . . . . . . Table A­10: Nominal traits -- signal acquisition system . . . . . . . . . . Table A­11: Nominal traits -- time base system . . . . . . . . . . . . . . . . . Table A­12: Nominal traits -- triggering system . . . . . . . . . . . . . . . . Table A­13: Nominal traits -- display system . . . . . . . . . . . . . . . . . . . Table A­14: Nominal traits -- I/O interface option . . . . . . . . . . . . . . Table A­15: Nominal traits -- power distribution system . . . . . . . . . Table A­16: Nominal traits -- mechanical characteristics . . . . . . . . Table A­17: Certifications and compliances . . . . . . . . . . . . . . . . . . . . Table B­1: Test equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table B­2: DC accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table C­1: VGA output connector pins . . . . . . . . . . . . . . . . . . . . . . . . Table C­2: International power cords . . . . . . . . . . . . . . . . . . . . . . . . . Table C­3: Language options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table C­4: Standard accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table C­5: Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table C­6: Accessory cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2­15 3­19 A­1 A­2 A­3 A­3 A­4 A­5 A­6 A­6 A­7 A­7 A­8 A­8 A­9 A­9 A­9 A­10 A­12 B­3 B­7 C­1 C­1 C­2 C­3 C­3 C­4

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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 the product only as specified. Only qualified personnel should perform service procedures.

Injury Precautions
Use Proper Power Cord Avoid Electric Overload
To avoid fire hazard, use only the power cord specified for this product. To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is outside the range specified for that terminal. To avoid injury or loss of life, do not connect or disconnect probes or test leads while they are connected to a voltage source. 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. To avoid electric shock or fire hazard, do not operate this product with covers or panels removed. To avoid fire hazard, use only the fuse type and rating specified for this product. To avoid electric shock, do not operate this product in wet or damp conditions. To avoid injury or fire hazard, do not operate this product in an explosive atmosphere.

Avoid Electric Shock

Ground the Product

Do Not Operate Without Covers Use Proper Fuse Do Not Operate in Wet/Damp Conditions Do Not Operate in an Explosive Atmosphere

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General Safety Summary

Product Damage Precautions
Use Proper Power Source
Do not operate this product from a power source that applies more than the voltage specified. To prevent product overheating, provide proper ventilation. If you suspect there is damage to this product, have it inspected by qualified service personnel.

Provide Proper Ventilation Do Not Operate With Suspected Failures

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.

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General Safety Summary

Symbols on the Product

The following symbols may appear on the product:

DANGER High Voltage

Protective Ground (Earth) Terminal

ATTENTION Refer to Manual

Double Insulated

Certifications and Compliances
CSA Certified Power Cords
CSA Certification includes the products and power cords appropriate for use in the North America power network. All other power cords supplied are approved for the country of use. Consult the product specifications for Overvoltage Category and IEC Classifications.

Compliances

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General Safety Summary

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Preface
This manual provides user information for the TDS 300 Two-Channel Digital Real-Time Oscilloscopes. The manual contains the following chapters and appendices: H H H H H H H H H Getting Started contains a brief product description; information needed to power on the oscilloscope, and a brief procedure to verify that it functions. Operating Basics contains user interface, probe, and autoset information. Reference contains task-oriented descriptions of oscilloscope features. The features are described in order from most basic to more specialized. Appendix A: Specifications contains typical, nominal, and warranted specifications for the oscilloscope. Appendix B: Performance Verification contains procedures you can use to verify that oscilloscope is operating within warranted specifications. Appendix C: Options and Accessories describes other products that are useful with the oscilloscope. Appendix D: General Care and Cleaning describes how to care for and clean the oscilloscope. Glossary contains a glossary of terms. Index contains a full index.

Related Manuals
These other manuals are available for the TDS 300 Two-Channel Digital Real-Time Oscilloscopes: H H H H The Reference gives you a quick overview of how to operate your oscilloscope. The XYZ's of Analog and Digital Oscilloscopes provides introductory instruction on basic oscilloscope theory. The Programmer Manual provides complete information about controlling the oscilloscope through the Option 14 Communications Board. The Service Manual provides information to troubleshoot and repair the oscilloscope at the module level.

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Getting Started

Getting Started

Tektronix TDS 340A, TDS 360, and TDS 380 oscilloscopes are digital signal processors and are superb tools for displaying and measuring waveforms. Their performance addresses the needs of both benchtop lab and portable applications with the following features: H H Two input channels, each with a record length of 1,000 samples and 8-bit vertical resolution. Both channels acquire waveforms simultaneously. 2 Gigasample/second maximum sample rate (TDS 380); 1 Gigasamples/ second maximum sample rate (TDS 360); 500 Megasamples/second maximum sample rate (TDS 340A). 400 MHz analog bandwidth and fastest time base setting of 1 ns/div (TDS 380); 200 MHz analog bandwidth and fastest time base setting of 2.5 ns/div (TDS 360); 100 MHz analog bandwidth and fastest time base setting of 5 ns/div (TDS 340A). A full complement of advanced functions including on-screen readout, AUTOSET, cursors, continuously updated automatic measurements, and FFT. Waveform averaging, waveform enveloping, and hardware peak detection. Floppy disk drive for mass storage of waveforms, setups, and hard copies. A unique graphical user interface (GUI) and a logical front-panel layout which combine to deliver the standard in usability pioneered by the TDS family of oscilloscopes.

H

H

H H H

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Start Up
To properly install and power on the oscilloscope, perform this procedure. 1. Check that you have the proper electrical connections. The rear label lists power requirements for all possible voltage inputs. 2. Check the fuse to be sure it is the proper type and rating (Figure 1­2). TDS 300 Series oscilloscopes are shipped with a UL-approved fuse installed. Fuse specifications are as follows: 5 mm × 20 mm, time-lag, 3.15 A, 250 V, or 1.25 in × 0.25 in, time-lag, 3 A, 250 V 3. Connect the proper power cord from the rear-panel power connector (Figure 1­2) to the power system. Use the power cord clamp to secure the cord to the rear panel. 4. Leave space for cooling. Do this by verifying that the air-intake and exhaust holes on the sides and bottom of the cabinet (where the fan operates) are free of any airflow obstructions. Leave at least 5.1 cm (2 in) free on each side. 5. Press the ON/STBY button to power up the oscilloscope (see Figure 1­1).

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ON/STBY button

Figure 1­1: The ON/STBY button

Line Fuse Replacement
WARNING. To avoid injury or death, unplug the line cord from the line voltage power source before continuing. 1. Have handy a flat-bladed screwdriver. 2. Set the oscilloscope so its bottom is down on the work surface and its rear is facing you. 3. Find the line cord on the rear cover. (See Figure 1­2.) Unplug the line cord from its receptacle. 4. Find the fuse drawer beneath the line-voltage plug on the rear panel. Now, pry open the drawer with a small flat-bladed screwdriver, and remove the line fuse. (See Figure 1­2.)

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Power connector Fuse

Fuse drawer

Figure 1­2: Line fuse removal 5. Reinstallation: Do in reverse steps 4 through 2 to reinstall the line fuse and then the line cord.

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Getting Started

Self Test
This procedure uses internal routines to verify that the oscilloscope functions and passes its internal self tests and signal-path compensations. It also confirms that the oscilloscope was adjusted properly at the time it was last adjusted. No test equipment or hookups are required. Equipment Required: None. Time Required: Approximately 5 minutes. Prerequisites: Power up the oscilloscope and allow a 20 minute warm up before doing this procedure. Procedure: 1. Press the front-panel button UTILITY. 2. Press the main-menu button System to select Diag. 3. Press the main-menu button Execute and then press the side-menu button OK Confirm Run Test. The internal diagnostics verify proper oscilloscope function. This verification takes about 30 seconds. While it progresses, a variety of test patterns flash on screen. When finished, status messages appear on the screen. 4. Check that the screen reports no failures. If it reports a failure, the oscilloscope has failed the self test. Contact your Tektronix representative for assistance. 5. Press CLEAR MENU. 6. Press UTILITY and then press the main-menu button System to select Cal. 7. Check that the word Pass appears in the main menu under the Voltage Reference, Timing, and Ext Trig menu labels. (See Figure 1­3.) If any of the labels read Fail, the oscilloscope has failed the self test. Contact your Tektronix representative for assistance.

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First, display the CAL menu. Second, verify Pass status for the adjustment sections. Third, run a signal path compensation and verify status is Pass.

Figure 1­3: Verifying adjustments and signal path compensation 8. Press Signal Path and then press the side menu button OK Compensate Signal Paths. When compensation completes, the status message updates to Pass or Fail in the main menu 9. Check that the word Pass appears under Signal Path in the main menu. (See Figure 1­3.) If Pass does not appear, the oscilloscope has failed the performance verification; return it to Tektronix for servicing.

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Functional Test
The purpose of this procedure is to confirm that the oscilloscope functions properly. NOTE. This procedure verifies functions; that is, it verifies that oscilloscope features operate. It does not verify that they operate within limits. Therefore, when the instructions that follow call for you to verify that a signal appears on-screen "that is about five divisions in amplitude" or "has a period of about six horizontal divisions," do NOT interpret the quantities given as limits. Operation within limits is checked in the performance tests, which begin on page 0­5. DO NOT make changes to the front-panel settings that are not called out in the procedure. If you make changes to these settings other than those called out in the procedure, you may obtain invalid results. In this case, just redo the procedure from step 1. Equipment Required: One P6109B (TDS 340A), P6111B (TDS 360), or P6114B (TDS 380) probe. Time Required: Approximately 5 minutes. Prerequisites: None. Procedure: 1. Install the probe on CH 1. Connect the probe tip to PROBE COMP on the front panel; leave the probe ground unconnected. (See Figure 1­4.)

Figure 1­4: Hookup for functional test

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2. Press the front-panel button SAVE/RECALL, the main-menu button Recall Factory Setup, and then the side-menu button OK Confirm Factory Init. 3. Press AUTOSET. 4. Set the VOLTS/DIV to 1 V. Use the vertical POSITION knob to center the waveform vertically on screen. 5. Set the SEC/DIV to 250 ms. 6. Check that a square wave probe-compensation signal of about five divisions in amplitude is on screen. 7. Check that one period of the square wave probe-compensation signal is about four horizontal divisions on screen. 8. Check that the horizontal POSITION knob positions the signal left and right on screen when rotated. 9. Press the front-panel button TRIGGER MENU, the main-menu button Mode, and then the side-menu button Normal. 10. Check that the trigger-level readout for the main trigger system changes with the trigger LEVEL knob. 11. Check that the trigger-level knob can trigger and untrigger the square-wave signal as you rotate it. (Leave the signal untriggered.) 12. Check that pressing SET LEVEL TO 50% triggers the signal that you just left untriggered. 13. Press the front-panel button ACQUIRE, the main-menu button Mode, and then the side-menu button Sample. 14. Check that the oscilloscope displays an actively acquiring waveform on-screen. (Note that there is noise present on the peaks of the square wave.) 15. Press the side-menu button Peak Detect. Check that the oscilloscope displays an actively acquiring waveform on screen with the noise "peak detected." 16. Press the side-menu button Envelope. Check that the oscilloscope displays an actively acquiring waveform on screen with the noise displayed. 17. Press the side-menu button Average. Check that the oscilloscope displays an actively acquiring waveform on screen with the noise reduced.

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18. Press WAVEFORM OFF to remove Channel 1 from the display. 19. Press CH 2 and move the probe to the CH 2 input. 20. Repeat steps 3 through 17 for Channel 2. 21. Disconnect the probe from the channel input and the PROBE COMP terminal.

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Operating Basics

Operating Basics
This chapter begins with eight illustrations that identify and describe each control and connector on the TDS 300 Series oscilloscope. Next, Operating Basics covers these additional topics: H H H Using the menu system Using probes Using autoset

Display and Power Controls

The Side Menu buttons provide access to side menu selections. See page 2­9 for more information about the user interface.

The CLEAR MENU button clears all menus from the screen.

The ON/STBY button toggles instrument power.

The Main Menu buttons provide access to main menu selections. See page 2­9 for more information about the user interface.

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Vertical Controls

The Vertical POSITION knob controls the vertical position of the selected waveform. The Waveform Select buttons display and select waveforms (CH1, CH2, MATH, REF1, and REF2). A light next to a button illuminates when that waveform is selected.

The VERTICAL MENU button calls up the vertical operations menu. For more information about vertical operations, see page 3­3.

Connector to chassis ground.

The SCALE knob controls the vertical scale of the selected waveform. The WAVEFORM OFF button turns off the selected waveform.

Probe compensation output. See page 2­12 for instructions on how to compensate the probes.

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Horizontal Controls

The Horizontal POSITION knob controls the horizontal position of all waveforms. The HORIZONTAL MENU button calls up the horizontal operations menu. For more information about horizontal operations, see page 3­6. The SCALE knob controls the horizontal scale of the active waveforms.

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Trigger Controls
The Trigger LEVEL knob controls the trigger. The TRIGGER MENU button calls up the trigger menu. See page 3­11 for more information about triggering.

The SET LEVEL TO 50% button sets the trigger level at the midpoint between the peaks of the trigger signal.

The FORCE TRIGGER button forces the oscilloscope to start acquiring a waveform regardless of whether a trigger event occurs. This button has no effect if the acquisition system is stopped.

The trigger status lights indicate the status of the triggering system. The TRIG'D light illuminates when the instrument recognizes a valid trigger. The READY light illuminates when the instrument can accept a valid trigger and is waiting for that event to occur.

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Miscellaneous Controls
The MEASURE button calls up the automated measurements menu. See page 3­17 for more information about automated measurements. The UTILITY button calls up the utility menu. See page 3­59 for more information about utilities. The floppy disk drive provides mass storage for waveforms, setups, and hard copies. The RUN/STOP button starts and stops acquisition.

The AUTOSET button automatically sets up the instrument to produce a usable display of the input signals. See page 2­15 for more information about the autoset function.

The HARDCOPY button starts print operations. See page 3­41 for more information about making hard copies.

The General Purpose Knob controls many side-menu functions, including the cursors. The SELECT button switches control from cursor to cursor.

The SAVE/RECALL button calls up the save/recall menu. See page 3­45 for more information about saving and recalling waveforms. See page 3­51 for more information about saving and recalling setups. The CURSOR button calls up the cursor menu. See page 3­21 for information about making measurements with cursors.

The ACQUIRE button calls up the acquisition menu. See page 3­25 for more information about controlling acquisition.

The DISPLAY button calls up the display menu. See page 3­27 for information about controlling the display.

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Display Map

Trigger position (T).

Indicates position of vertical bar cursors in the waveform record.

The waveform record icon.

Shows what part of the waveform record is displayed.

The value entered with the general purpose knob. When the general purpose knob is first assigned, the knob icon appears here.

The Status Readouts show trigger status and acquisition status (mode and sampling rate or number of acquisitions).

Trigger level indicator Trigger point indicator Channel ground indicator

Cursor measurement readouts. See page 3­21 for more information about cursors.

The side menu offers a choice of specific actions.

The Channel readout shows the vertical scale of all active channels.

The Trigger readout shows the trigger source and level and whether the oscilloscope is triggered on the rising or falling edge of the waveform. When in video-trigger mode, the readout displays source and trigger feature (Field 1, Field 2, or Lines).

The main menu offers a choice of major actions.

The Time base readout shows the time base setting. M indicates (M)ain time base, D indicates (D)elayed time base.

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Inputs

The channel BNC inputs (CH1 and CH2) accept electrical signals for display.

The EXT TRIG input accepts external trigger signals. See page 3­12 for more information about external triggering.

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Rear-Panel Connectors

The Option 14 Panel (Option 14 instruments only) allows access to three communications interfaces: a Centronics parallel port, an RS-232 interface, and a GPIB interface. It also includes a VGA video-compatible output port and a power connector for the optional TDS4F5P printer upgrade kit. You can use the Centronics, RS-232, and GPIB interfaces to transmit hardcopy data; see page 3­41 for hard copy procedures. You can use the GPIB and RS-232 interfaces to operate and program the oscilloscope from a GPIB controller; refer to the TDS 340A, TDS 360 & TDS 380 Programmer Manual for more information.

The power connector accepts line voltage to power the instrument. See page 0­1 for a list of power cord and connector options.

The fuse drawer holds the line fuse. See page 1­3 for fuse replacement procedures.

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Using the Menu System
TDS 300 Series oscilloscopes use an intuitive user interface. This interface reduces front-panel clutter while allowing easy access to specialized functions through the menu structure. The procedure on page 2­10 illustrates how to navigate in the menu structure. If you are unfamiliar with this menu system, you may want to run through the procedure several times to learn how you can access functions and subfunctions. Refer to Figure 2­1 as necessary.

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1 Press any of the front-panel menu buttons.

2 Select an item from the main (bottom) menu
or use leftmost button to pop up selections.

3 Select an item from the side menu, if displayed.

4 Adjust menu item values with general purpose knob.

Figure 2­1: Using menus 1. Push one of the indicated front-panel buttons to call up a menu of functions. This first menu is the main menu. Sometimes the main menu will be a side menu (step 3), but most main menus are bottom menus.

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2. Push a bottom menu button to select a function. One of three things result: H If the function has no subfunctions, it becomes active. If it is a variable function, you can now use the General Purpose Knob to adjust it (step 4). If the function has subfunctions, they appear on the side menu (step 3). The leftmost bottom menu button sometimes activates a pop-up menu (as shown in Figure 2­2). You can cycle through the pop-up menu options by repeatedly pressing the button. Each selection calls up different bottom and side menus.

H H

Figure 2­2: A pop-up menu 3. Push a side-menu button to select a subfunction. 4. Use the General Purpose Knob to alter variable-function or subfunction settings. 5. Press the CLEAR MENU button to remove a menu from the screen.

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Using the Probes
The TDS 340A, TDS 360, and TDS 380 come with two standard-accessory probes. Use these probes to conduct signals to the oscilloscope. For detailed probe specifications and instructions, see the instruction manual packaged with the probe.

Connecting a Probe

To connect a probe to the oscilloscope, attach the BNC end of the probe to either the CH 1 or CH 2 input. Be sure to twist the probe end clockwise until the BNC is fully locked. See Figure 2­3.

Figure 2­3: Connecting a probe

Compensating a Probe

Use the following procedure to compensate the probe every time you set up your oscilloscope. 1. Attach the probe BNC connector to the CH 1 input and attach the probe tip to the PROBE COMP output signal as shown in Figure 2­4. Attach the probe ground clip to the outer ring of the CH 2 BNC.

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Figure 2­4: Probe compensation setup 2. Press AUTOSET. The oscilloscope displays the compensation waveform. It should resemble the waveform shown in Figure 2­5.

Figure 2­5: Compensation waveform

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3. Check that the waveform indicates correct compensation (see Figure 2­6). If the waveform indicates over or undercompensation, use the alignment tool provided with the probe to adjust the compensation as shown in Figure 2­7.

Probe compensated correctly

Probe overcompensated

Probe undercompensated

Figure 2­6: How probe compensation affects signals

Compensation adjustment

Figure 2­7: Location of probe compensation adjustment

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Using Autoset
The TDS 300 Series autoset feature produces a stable, triggered display of almost any input signal. To use autoset, connect a signal to either the CH 1 or CH 2 input connector, and press the AUTOSET button (shown in Figure 2­8).
Autoset

Figure 2­8: The AUTOSET button Table 2­1 specifies the changes autoset makes in your oscilloscope setup. Table 2­1: Autoset defaults
Control Selected channel Acquire Mode Acquire Stop After Display Style Display Intensity -- Overall Display Format Horizontal Position Horizontal Scale Horizontal Time Base Trigger Position Trigger Type Trigger Source Trigger Level Trigger Slope Trigger Coupling Changed by autoset to If none already displayed, numerically lowest of the displayed channels Sample RUN/STOP button only Vectors If less than 50%, set to 75% YT Centered within the graticule window As determined by the signal frequency Main Only Unchanged Edge Numerically lowest of the displayed channels (the selected channel) Midpoint of data for the trigger source Positive DC

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Table 2­1: Autoset defaults (Cont.)
Control Trigger Holdoff Vertical Scale Vertical Coupling Vertical Bandwidth Vertical Offset Changed by autoset to 500 ns As determined by the signal level DC unless AC was previously set; AC remains unchanged Full 0 volts

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Reference

Introduction
This chapter describes common tasks where you can use the TDS 300 oscilloscope. The tasks listed below are in a functional order, starting with the most basic and then moving to the more specialized: H H H H H H H H H H H Manipulating Waveforms Triggering Taking Measurements Controlling Acquisition Controlling the Display Using the FFT Making Hard Copies Saving and Recalling Waveforms Saving and Recalling Setups Using the File System Using the Utility Menu

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Manipulating Waveforms
There are two basic ways to manipulate waveforms acquired by TDS 300 Series oscilloscopes. H H You can change their display parameters with the vertical and horizontal systems You can add, subtract, and multiply them with the waveform math feature

Vertical Operations
To access the vertical-system features, press the VERTICAL MENU button, shown in Figure 3­1. NOTE. The VERTICAL MENU button calls up the vertical menu only if a channel waveform (CH 1 or CH 2) is selected. If a math or reference waveform is selected, the VERTICAL MENU button calls up the math or reference waveform menu.

Vertical menu

Figure 3­1: The VERTICAL MENU button

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Figure 3­2 shows the vertical menu.

Figure 3­2: The vertical menu Use the vertical menu to perform these tasks.

Select Input Coupling

Press the main-menu button Coupling. Use the side menu to select DC, AC, or ground (GND) coupling. Press the main-menu button Invert. Use the side menu to turn invert off and on. When you turn invert on, the selected waveform "flips" (reverses polarity) around the zero volt axis. Figure 3­3 shows an inverted pulse signal. NOTE. Invert flips the waveform, but it does not alter the trigger level accordingly. To obtain a stable trigger after inverting a waveform, press SET LEVEL TO 50%.

Invert a Waveform

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Normal waveform Inverted waveform

Figure 3­3: Inverting a waveform

Select Bandwidth

Press the main-menu button Bandwidth. Use the side menu to switch between 20 MHz and full bandwidth. Press the main-menu button Fine Scale to activate the General Purpose Knob. Then use the knob to make precise adjustments to the vertical scale setting. Press the main-menu button Position to activate the General Purpose Knob. Then, use the knob to adjust vertical position or use the side menu to set the vertical position to 0 divisions. Vertical position is limited to a range of "5 divisions. NOTE. This selection performs the same function as the vertical POSITION knob.

Make Fine V/div Adjustments Adjust Vertical Position

Adjust Vertical Offset

Press the main-menu button Offset to activate the General Purpose Knob. Then use the knob to adjust offset or use the side menu to set the offset to 0 V. Offset performs a function similar to the vertical POSITION knob, but it has a wider range. Use offset to view a waveform that has a large DC bias.

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Horizontal Operations
To access horizontal system features, press the HORIZONTAL MENU button, shown in Figure 3­4. Figure 3­5 shows the horizontal menu.

Horizontal menu

Figure 3­4: The HORIZONTAL MENU button

Figure 3­5: The horizontal menu

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Use the horizontal menu to perform these tasks.

Select the Time Base

Press the main-menu button Time Base. Use the side menu to select from these options: H H Press Main Only to show only the main time base. Press Intensified to show both the main and delayed time bases. The oscilloscope intensifies a portion of the waveform; this intensified zone indicates the location of the delayed time base with respect to the main. Use the horizontal SCALE knob to change the length of the zone and the General Purpose Knob to change its position. Press Delayed Only to show only the delayed time base. Use the General Purpose Knob to adjust the delay time (the interval between the main and delayed time bases). You adjust the delay time in coarse increments when Main Only or Intensified are selected and in fine increments when Delayed Only is selected. The side menu selection Delayed Runs After Main shows the delay time. Press Set to Min to set the delay time to its minimum value.

H H

H

Adjust Trigger Position

Press the main-menu button Trigger Position. Use the General Purpose Knob to adjust horizontal trigger position or use the side menu to set the trigger position to near the beginning, middle, or end of the waveform record. (The TDS 380 maximum pretrigger is 75%.) Press the main-menu button Fit to Screen. Use the side menu to select from these options: H Press Off to display 500 points of the 1000-point waveform record. The waveform record icon, described on page 2­6, shows the location of the displayed portion of the waveform record. Use the horizontal POSITION knob to adjust the portion of the waveform record to display. Press On to display the entire 1000-point waveform record. If you use this setting to display FFT math waveforms, you can view a complete frequency spectrum, from DC to the Nyquist frequency.

Select Fit to Screen

H

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Displaying Math Waveforms
A TDS 300 Series oscilloscope performs math operations on one or both channel waveforms. Using one channel waveform, the oscilloscope can calculate a Fast Fourier Transform (FFT) to display the frequency content of a signal. Using both channel waveforms, the oscilloscope can add or multiply them or subtract one from the other and display the result as a math waveform. To activate the math waveform, press the MATH button, shown in Figure 3­6.

Math

Figure 3­6: The MATH button To choose one of the arithmetic math functions, select a formula from the side menu (Ch1 + Ch2, Ch1 ­ Ch2, Ch2 ­ Ch1, or CH1 * Ch2). Figure 3­7 shows a square wave on Channel 2 added to a sine wave on Channel 1. For more information about the FFT math function, refer to the section Using the FFT on page 3­31.

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Figure 3­7: A math waveform

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Triggering
TDS 300 Series oscilloscopes have two triggers: a standard edge trigger and a video trigger. To access trigger settings and features, press the TRIGGER MENU button, shown in Figure 3­8.

Trigger menu

Figure 3­8: The TRIGGER MENU button This button calls up one of two menus: the edge trigger menu or the video trigger menu. Press the leftmost main-menu button to switch between the two trigger menus.

Edge Triggering
The edge trigger triggers on the rising or falling edge of the input signal. You can access edge-trigger settings through the edge trigger menu, shown in Figure 3­9. Be sure the leftmost main menu selection indicates Type Edge.

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Triggering

Figure 3­9: The edge trigger menu Use the edge trigger menu to perform these tasks.

Select the Trigger Source

Press the main-menu button Source. Use the side menu to select from these options: H H Press Ch1 or Ch2 to set the trigger source to one of the input channels. Press Ext or Ext/10 to set the trigger source to the EXT TRIG input on the front panel. Ext/10 attenuates the external input signal by a factor of ten. Note that while the instrument can trigger on external trigger signals, it cannot display them. Press AC to set the trigger source to the oscilloscope line voltage signal.

H

Select Trigger Coupling

Press the main-menu button Coupling. Use the side menu to select from these options: H H H Press DC to select DC coupling. Press AC to select AC coupling. Press HF Reject to select high-frequency reject mode. High-frequency rejection removes the high-frequency portion of the triggering signal. This

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Triggering

allows only the low-frequency components to pass on to the triggering system. High-frequency reject mode attenuates signals above 30 kHz. H Press LF Reject to select low-frequency reject mode. Low-frequency rejection is the opposite of high-frequency rejection. Low-frequency reject mode attenuates signals below 80 kHz. Press Noise Reject to select noise reject mode. Noise rejection provides DC low sensitivity, but it requires additional signal amplitude for stable triggering.

H

Change Trigger Slope

Press the main-menu button Slope. Use the top two side-menu buttons to switch between positive-going and negative-going slope. Press the main-menu button Level. Use the side menu to select from these options: H Use the General Purpose Knob to adjust trigger level. (Note that this selection performs the same function as the trigger LEVEL knob on the front panel.) Press Set to TTL to automatically set the trigger level to the TTL switching threshold. Press Set to ECL to automatically set the trigger level to the ECL switching threshold. Press Set to 50% to set the trigger level to the midpoint of the trigger source signal. (Note that this selection performs the same function as the SET LEVEL TO 50% button on the front panel.)

Adjust Trigger Level

H H H

Select Trigger Mode

Press the main-menu button Mode. Use the side menu to select either Auto or Normal mode. In normal trigger mode, the oscilloscope waits for a valid trigger from the trigger signal source. In auto trigger mode, the oscilloscope produces an internal trigger in the absence of other trigger events. At horizontal scale settings of 100 ms per division and slower, auto trigger mode switches to an untriggered roll display. When the display is in "roll" mode the envelope and average acquisition modes does not work properly, and the display does not show a trigger "T" on the waveform.

Adjust Holdoff

Press the main-menu button Holdoff to activate the General Purpose Knob. Use the knob to adjust holdoff; the TDS 300 Series have a holdoff range of 500 ns to 10 s. Press the side-menu button Set to Min to quickly set the holdoff to 500 ns.

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Video Triggering
The video trigger triggers on field 1, field 2, any field, or lines of an NTSC or PAL standard video signal. It can also trigger on nonstandard video signals with similar sync signals. You can access video trigger settings through the video trigger menu, shown in Figure 3­10.

Figure 3­10: The video trigger menu Use the video trigger menu to perform these tasks.

Select Trigger Source, Mode, and Holdoff

These main menu selections perform exactly as in the edge trigger menu, because the two triggers share these parameters. For example, if you set the edge trigger holdoff to 2.3 ms and then switch to the video trigger, its holdoff will also be 2.3 ms. Press the main-menu button Trigger On to select the part of the video signal on which the oscilloscope will trigger. Use the side menu to select from these options: H H Press Field 1 to trigger on field 1 of the video signal. Press Field 2 to trigger on field 2 of the video signal.

Select Trigger Point

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H H

Press Any Field to trigger on any field of the video signal. Press Lines to trigger on all lines of the video signal.

The video trigger can only trigger on negative-going sync. If you need to trigger on the positive-going sync of a signal, simply invert the signal from the vertical menu (see page 3­4).

Select Scan Rate

Press the main-menu button Scan Rate to select the scan rate frequency range. Use the side menu to select from the following rates (see Figure 3­11): H H H H H Press Rate 1 to select a scan rate of 15 to 20 kHz. Press Rate 2 to select a scan rate of 20 to 25 kHz. Press Rate 3 to select a scan rate of 25 to 35 kHz. Press Rate 4 to select a scan rate of 35 to 50 kHz. Press Rate 5 to select a scan rate of 50 to 65 kHz.

Figure 3­11: The video scan-rate menu

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Triggering

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Taking Measurements
TDS 300 Series oscilloscopes have two features that make it easy for you to measure data from a displayed waveform: automated measurements and cursors.

Automated Measurements
The oscilloscope can perform 21 different automated measurements on a waveform (four measurements at any one time). To access these measurements, press the MEASURE button, shown in Figure 3­12.
Measure

Figure 3­12: The MEASURE button The MEASURE button activates the measure menu, shown in Figure 3­13.

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Figure 3­13: The measure menu and active measurements Use the measure menu to perform the following tasks.

Activate a Measurement

Use this procedure to activate a measurement for the selected waveform: 1. Press the main-menu button Select Measrmnt for.... 2. If necessary, press the lowermost side-menu button (labeled ­more­ x out of 6) to page through the available measurements until the measurement you want to take appears in the side menu. 3. Then press one of the top four side-menu buttons to activate a particular measurement. The measured values appear to the left of the side menu, as shown in Figure 3­13. For definitions of the available measurements, see Table 3­1. NOTE. Measurements only remain active while the channel is active. If you activate several measurements for a channel and then press the WAVEFORM OFF button, the measurements disappear just like the waveform.

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Table 3­1: Measurement definitions
Name Period Frequency Positive Width Negative Width Rise time Definition Timing measurement. Time it takes for the first complete signal cycle to happen in the waveform or gated region. The reciprocal of frequency. Measured in seconds. Timing measurement for the first cycle in the waveform or gated region. The reciprocal of the period. Measured in Hertz (Hz) where 1 Hz = 1 cycle per second. Timing measurement of the first pulse in the waveform or gated region. The distance (time) between MidRef (default 50%) amplitude points of a positive pulse. Timing measurement of the first pulse in the waveform or gated region. The distance (time) between MidRef (default 50%) amplitude points of a negative pulse. Timing measurement. Time taken for the leading edge of the first pulse in the waveform or gated region to rise from a Low Ref value (default = 10%) to a High Ref value (default = 90%) of its final value. Timing measurement. Time taken for the falling edge of the first pulse in the waveform or gated region to fall from a High Ref value (default = 90%) to a Low Ref value (default =10%) of its final value. Timing measurement of the first cycle in the waveform or gated region. The ratio of the positive pulse width to the signal period expressed as a percentage. PositiveDutyCycle + PositiveWidth 100% Period Timing measurement of the first cycle in the waveform or gated region. The ratio of the negative pulse width to the signal period expressed as a percentage. NegativeWidth 100% Period Timing measurement. The duration of a burst. Measured over the entire waveform or gated region. NegativeDutyCycle + Voltage measurement over the entire waveform or gated region. PositiveOvershoot + Negative Overshoot High Low Maximum Minimum Peak to Peak Max­High Amplitude 100%

Fall Time

Positive Duty Cycle

Negative Duty Cycle

Burst Width Positive Overshoot

Voltage measurement. Measured over the entire waveform or gated region. NegativeOvershoot + Low­Min Amplitude 100%

The value used as 100% whenever High Ref, Mid Ref, and Low Ref values are needed (as in fall time and rise time measurements). Measured over the entire waveform or gated region. The value used as 0% whenever High Ref, Mid Ref, and Low Ref values are needed as in fall time and rise time measurements. Measured over the entire waveform or gated region. Voltage measurement. The maximum amplitude. Typically the most positive peak voltage. Measured over the entire waveform or gated region. Voltage measurement. The minimum amplitude. Typically the most negative peak voltage. Measured over the entire waveform or gated region. Voltage measurement. The absolute difference between the maximum and minimum amplitude in the entire waveform or gated region.

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Table 3­1: Measurement definitions (Cont.)
Name Amplitude Definition Voltage measurement. The high value less the low value measured over the entire waveform or gated region. Amplitude = High ­ Low Mean Cycle Mean Cycle RMS RMS Voltage measurement. The arithmetic mean over the entire waveform or gated region. Voltage measurement. The arithmetic mean over the first cycle in the waveform, or the first cycle in the gated region. Voltage measurement. The true Root Mean Square voltage over the first cycle in the waveform, or the first cycle in the gated region. Voltage measurement. The true Root Mean Square voltage over the entire waveform or gated region.

Remove a Measurement

Press the main-menu button Remove Measrmnt. Use the top four side-menu buttons to remove specific measurements or use the lowest side-menu button to remove all measurements. By default, TDS 300 Series oscilloscopes take automated measurements on the entire waveform record. If you want a measurement of only a portion of the waveform, you can use gating to mark the boundaries of that portion. Use this procedure to "gate" a signal: 1. Press the main-menu button Select Measrmnt for.... 2. If necessary, press the lowermost side-menu button (labeled ­more­ x out of 6) to page through the available measurements until the measurement you want to take appears in the side menu. 3. Then press one of the top four side-menu buttons to activate a particular measurement. 4. Press the main-menu button Gating. 5. Press the side-menu button Gate with V Bar Cursors. 6. Use the General Purpose Knob to set one cursor to the left edge of your gate. 7. Press SELECT. 8. Use the General Purpose Knob to set the other cursor to the right edge of the gate. All automated measurements now take data only from the portion of the waveform that is within the gate. 9. Press Gate Off to turn gating off.

Using Gating

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NOTE. Gate Off deactivates the gating function, but it does not deactivate the vertical cursors. Deactivate the cursors from the cursor menu as described in the next section.

Switch High-Low Setup

Press the main-menu button High­Low Setup to change the way the measurement system determines the high and low levels of waveforms. Use the side menu to select from these options: H Press Histogram to set the levels statistically. The oscilloscope attempts to find the highest density of points above and below the midpoint, ignoring spikes. This method works well for measuring square waves and pulse waveforms. Press Min­Max to set the levels to the lowest amplitude (most negative) and highest amplitude (most positive) samples.

H

Set Reference Levels

Press the main-menu button Reference Levels to set the high, middle, and low reference levels. The oscilloscope uses these levels for rise time, fall time, width, and overshoot measurements. Use the side menu to select from these options: H H Press Set Levels in to toggle the units of the reference levels. Switch between volts and percent. Press High Ref, Mid Ref, or Low Ref to select a particular reference level. Use the General Purpose Knob to alter the selected reference level. The defaults are 90%, 50%, and 10%, respectively.

Taking Measurements with Cursors
You can also take quantitative measurements of a waveform with the cursor system. To take measurements with cursors, follow this procedure: 1. Press the front panel button CURSOR, shown in Figure 3­14. The CURSOR button calls up the cursor menu, shown in Figure 3­15.

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Cursor

Figure 3­14: The CURSOR button

Figure 3­15: The cursor menu 2. If you want to take a time measurement in Hertz instead of seconds, press the main-menu button Time Units and use the side menu to switch between the two. 3. If the main menu selection Function is not highlighted, press its main-menu button. 4. Use the side menu to select the type of measurement you want to take. Select H Bars to take a voltage measurement, select V Bars to take a time measurement, or select Paired to take simultaneous voltage and time measurements.

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5. Use the General Purpose Knob to move one cursor to a desired measurement point. For example, if you wanted to measure both the peak-to-peak voltage and period of a sine wave, you would start by moving one paired cursor to a "valley" (see Figure 3­16).

Figure 3­16: Paired cursor measurements of a sine wave 6. Press SELECT. 7. Use the General Purpose Knob to move the second cursor to another desired measurement point. To continue the example, you would move the second cursor to the previous "peak." 8. Read the mea