Tektronix TDS 380 User manual

User Manual
TDS 340A, TDS 360 & TDS 380
Digital Real-Time Oscilloscopes
070-9459-04
Copyright 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 97070–1000
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
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–2
1–3
1–5
1–7
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
2–12
2–15
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manipulating Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1
3–3
Vertical Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Math Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3
3–6
3–8
Getting Started
Operating Basics
Reference
Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–11
Edge Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–11
3–14
Taking Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–17
Automated Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taking Measurements with Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–17
3–21
Controlling Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controlling the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the FFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–25
3–27
3–31
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Considerations for Using FFTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–31
3–32
3–36
Making Hard Copies (Option 14 Equipped Instruments Only) . . . . .
3–41
Configuring Hard Copy Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving a Hard Copy to Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–41
3–43
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Table of Contents
Saving and Recalling Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–45
Using Reference Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Viewing a Waveform on a Spreadsheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–45
3–47
3–49
Saving and Recalling Front-Panel Setups . . . . . . . . . . . . . . . . . . . . . . .
3–51
Using Internal Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–52
3–52
Using the File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Utility Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–55
3–59
Setting the Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–60
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–1
Warranted Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal Traits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–1
A–5
A–7
Appendix B: Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . .
B–1
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Test Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Base System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sine Wave Generator Leveling Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1
B–3
B–4
B–5
B–5
B–10
B–11
B–14
Appendix C: Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . .
C–1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C–1
C–3
C–3
C–4
C–4
Appendix D: General Care and Cleaning . . . . . . . . . . . . . . . . . . . . . . .
D–1
General Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D–1
D–1
Appendices
Glossary
Index
ii
TDS 340A, TDS 360 & TDS 380 User Manual
Table of Contents
List of Figures
Figure 1–1: The ON/STBY button . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–2: Line fuse removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–3: Verifying adjustments and signal path compensation . . .
Figure 1–4: Hookup for functional test . . . . . . . . . . . . . . . . . . . . . . . . .
1–3
1–4
1–6
1–7
Figure 2–1: Using menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: A pop-up menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Connecting a probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: Probe compensation setup . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–5: Compensation waveform . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–6: How probe compensation affects signals . . . . . . . . . . . . .
Figure 2–7: Location of probe compensation adjustment . . . . . . . . . .
Figure 2–8: The AUTOSET button . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–10
2–11
2–12
2–13
2–13
2–14
2–14
2–15
Figure 3–1: The VERTICAL MENU button . . . . . . . . . . . . . . . . . . . .
Figure 3–2: The vertical menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–3: Inverting a waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–4: The HORIZONTAL MENU button . . . . . . . . . . . . . . . . .
Figure 3–5: The horizontal menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–6: The MATH button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–7: A math waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–8: The TRIGGER MENU button . . . . . . . . . . . . . . . . . . . . .
Figure 3–9: The edge trigger menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–10: The video trigger menu . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–11: The video scan-rate menu . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–12: The MEASURE button . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–13: The measure menu and active measurements . . . . . . . .
Figure 3–14: The CURSOR button . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–15: The cursor menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–16: Paired cursor measurements of a sine wave . . . . . . . . . .
Figure 3–17: The ACQUIRE button . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–18: The acquire menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–19: The DISPLAY button . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–20: The display menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–21: System response to an impulse . . . . . . . . . . . . . . . . . . . .
Figure 3–22: Define FFT waveform menu . . . . . . . . . . . . . . . . . . . . . .
3–3
3–4
3–5
3–6
3–6
3–8
3–9
3–11
3–12
3–14
3–15
3–17
3–18
3–22
3–22
3–23
3–25
3–25
3–27
3–27
3–32
3–33
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iv
Figure 3–23: Cursor measurement of an FFT waveform . . . . . . . . . .
Figure 3–24: FFT time domain record vs. FFT frequency
domain record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–25: How aliased frequencies appear in an FFT . . . . . . . . . .
Figure 3–26: Windowing the FFT time domain record . . . . . . . . . . . .
Figure 3–27: The HARDCOPY button . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–28: The UTILITY button . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–29: The system I/O menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–30: The reference waveform buttons . . . . . . . . . . . . . . . . . . .
Figure 3–31: A reference waveform menu . . . . . . . . . . . . . . . . . . . . . .
Figure 3–32: Save Format menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–33: The SAVE/RECALL button . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–34: The save/recall menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–35: File utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–36: File system — Labelling menu . . . . . . . . . . . . . . . . . . . . .
Figure 3–37: The UTILITY button . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–38: The utility pop-up menu . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–39: Date and time display . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–35
3–36
3–38
3–39
3–41
3–42
3–42
3–45
3–46
3–48
3–51
3–51
3–55
3–57
3–59
3–60
3–61
Figure A–1: TDS 340A, TDS 360, and TDS 380 dimensions . . . . . . . .
A–11
Figure B–1: Menu locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–2: Hookup for DC voltage measurement accuracy
check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–3: Hookup for analog bandwidth check . . . . . . . . . . . . . . . .
Figure B–4: Measuring analog bandwidth . . . . . . . . . . . . . . . . . . . . . .
Figure B–5: Hookup for sample rate check . . . . . . . . . . . . . . . . . . . . .
Figure B–6: Hookup for trigger sensitivity check . . . . . . . . . . . . . . . .
Figure B–7: Measuring trigger sensitivity . . . . . . . . . . . . . . . . . . . . . .
Figure B–8: Hookup for sine wave generator leveling . . . . . . . . . . . . .
B–2
B–6
B–8
B–9
B–10
B–12
B–13
B–15
TDS 340A, TDS 360 & TDS 380 User Manual
Table of Contents
List of Tables
Table 2–1: Autoset defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–15
Table 3–1: Measurement definitions . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–19
Table A–1: Warranted characteristics — signal acquisition system .
Table A–2: Warranted characteristics — time base system . . . . . . . .
Table A–3: Warranted characteristics — triggering system . . . . . . .
Table A–4: Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–5: Warranted characteristics — environmental . . . . . . . . . .
Table A–6: Typical characteristics — signal acquisition system . . . .
Table A–7: Typical characteristics — triggering system . . . . . . . . . .
Table A–8: Typical characteristics — probe compensator output . . .
Table A–9: Typical characteristics — data handling . . . . . . . . . . . . .
Table A–10: Nominal traits — signal acquisition system . . . . . . . . . .
Table A–11: Nominal traits — time base system . . . . . . . . . . . . . . . . .
Table A–12: Nominal traits — triggering system . . . . . . . . . . . . . . . .
Table A–13: Nominal traits — display system . . . . . . . . . . . . . . . . . . .
Table A–14: Nominal traits — I/O interface option . . . . . . . . . . . . . .
Table A–15: Nominal traits — power distribution system . . . . . . . . .
Table A–16: Nominal traits — mechanical characteristics . . . . . . . .
Table A–17: Certifications and compliances . . . . . . . . . . . . . . . . . . . .
A–1
A–2
A–3
A–3
A–4
A–5
A–6
A–6
A–7
A–7
A–8
A–8
A–9
A–9
A–9
A–10
A–12
Table B–1: Test equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–2: DC accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–3
B–7
Table C–1: VGA output connector pins . . . . . . . . . . . . . . . . . . . . . . . .
Table C–2: International power cords . . . . . . . . . . . . . . . . . . . . . . . . .
Table C–3: Language options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table C–4: Standard accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table C–5: Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table C–6: Accessory cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C–1
C–1
C–2
C–3
C–3
C–4
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TDS 340A, TDS 360 & TDS 380 User Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use the
product only as specified.
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.
Avoid Electric Shock
To avoid injury or loss of life, do not connect or disconnect probes or test leads
while they are connected to a voltage source.
Ground the Product
This product is grounded through the grounding conductor of the power cord. To
avoid electric shock, the grounding conductor must be connected to earth
ground. Before making connections to the input or output terminals of the
product, ensure that the product is properly grounded.
Do Not Operate Without
Covers
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
Use Proper Fuse
To avoid fire hazard, use only the fuse type and rating specified for this product.
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in an
Explosive Atmosphere
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.
TDS 340A, TDS 360 & TDS 380 User Manual
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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.
Provide Proper Ventilation
To prevent product overheating, provide proper ventilation.
Do Not Operate With
Suspected Failures
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
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.
viii
TDS 340A, TDS 360 & TDS 380 User Manual
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.
Compliances
Consult the product specifications for Overvoltage Category and IEC Classifications.
TDS 340A, TDS 360 & TDS 380 User Manual
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General Safety Summary
x
TDS 340A, TDS 360 & TDS 380 User Manual
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
Getting Started contains a brief product description; information needed to
power on the oscilloscope, and a brief procedure to verify that it functions.
H
Operating Basics contains user interface, probe, and autoset information.
H
Reference contains task-oriented descriptions of oscilloscope features. The
features are described in order from most basic to more specialized.
H
Appendix A: Specifications contains typical, nominal, and warranted
specifications for the oscilloscope.
H
Appendix B: Performance Verification contains procedures you can use to
verify that oscilloscope is operating within warranted specifications.
H
Appendix C: Options and Accessories describes other products that are
useful with the oscilloscope.
H
Appendix D: General Care and Cleaning describes how to care for and clean
the oscilloscope.
H
Glossary contains a glossary of terms.
H
Index contains a full index.
Related Manuals
These other manuals are available for the TDS 300 Two-Channel Digital
Real-Time Oscilloscopes:
H
The Reference gives you a quick overview of how to operate your oscilloscope.
H
The XYZ’s of Analog and Digital Oscilloscopes provides introductory
instruction on basic oscilloscope theory.
H
The Programmer Manual provides complete information about controlling
the oscilloscope through the Option 14 Communications Board.
H
The Service Manual provides information to troubleshoot and repair the
oscilloscope at the module level.
TDS 340A, TDS 360 & TDS 380 User Manual
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Preface
xii
TDS 340A, TDS 360 & TDS 380 User Manual
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
Two input channels, each with a record length of 1,000 samples and 8-bit
vertical resolution. Both channels acquire waveforms simultaneously.
H
2 Gigasample/second maximum sample rate (TDS 380); 1 Gigasamples/
second maximum sample rate (TDS 360); 500 Megasamples/second
maximum sample rate (TDS 340A).
H
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).
H
A full complement of advanced functions including on-screen readout,
AUTOSET, cursors, continuously updated automatic measurements, and
FFT.
H
Waveform averaging, waveform enveloping, and hardware peak detection.
H
Floppy disk drive for mass storage of waveforms, setups, and hard copies.
H
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.
TDS 340A, TDS 360 & TDS 380 User Manual
1–1
Getting Started
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 1–2).
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 1–2) 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 1–1).
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TDS 340A, TDS 360 & TDS 380 User Manual
Getting Started
ON/STBY button
Figure 1–1: 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 1–2.) 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 1–2.)
TDS 340A, TDS 360 & TDS 380 User Manual
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Getting Started
Power connector
Fuse
Fuse drawer
Figure 1–2: Line fuse removal
5. Reinstallation: Do in reverse steps 4 through 2 to reinstall the line fuse and
then the line cord.
1–4
TDS 340A, TDS 360 & TDS 380 User Manual
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 1–3.) If any of the
labels read Fail, the oscilloscope has failed the self test. Contact your
Tektronix representative for assistance.
TDS 340A, TDS 360 & TDS 380 User Manual
1–5
Getting Started
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 1–3: 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 1–3.) If Pass does not appear, the oscilloscope has failed the
performance verification; return it to Tektronix for servicing.
1–6
TDS 340A, TDS 360 & TDS 380 User Manual
Getting Started
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 0–5.
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 1–4.)
Figure 1–4: Hookup for functional test
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Getting Started
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 s.
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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TDS 340A, TDS 360 & TDS 380 User Manual
Getting Started
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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Getting Started
1–10
TDS 340A, TDS 360 & TDS 380 User Manual
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
Using the menu system
H
Using probes
H
Using autoset
Display and Power Controls
The Side Menu buttons provide
access to side menu selections.
See page 2–9 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 2–9 for
more information about the user interface.
TDS 340A, TDS 360 & TDS 380 User Manual
2–1
Operating Basics
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.
Connector to chassis ground.
Probe compensation output. See
page 2–12 for instructions on how to
compensate the probes.
2–2
The VERTICAL MENU button calls up
the vertical operations menu. For more
information about vertical operations,
see page 3–3.
The SCALE knob controls the vertical
scale of the selected waveform.
The WAVEFORM OFF button turns
off the selected waveform.
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
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 3–6.
The SCALE knob controls the horizontal
scale of the active waveforms.
TDS 340A, TDS 360 & TDS 380 User Manual
2–3
Operating Basics
Trigger Controls
The Trigger LEVEL knob controls the
trigger.
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.
2–4
The TRIGGER MENU button calls up
the trigger menu. See page 3–11 for
more information about triggering.
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.
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
Miscellaneous Controls
The MEASURE button calls up the
automated measurements menu. See
page 3–17 for more information about
automated measurements.
The UTILITY button calls up the utility
menu. See page 3–59 for more
information about utilities.
The floppy disk drive provides
mass storage for waveforms,
setups, and hard copies.
The AUTOSET button automatically sets
up the instrument to produce a usable
display of the input signals. See
page 2–15 for more information about
the autoset function.
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 3–45 for more
information about saving and recalling
waveforms. See page 3–51 for more
information about saving and recalling
setups.
The RUN/STOP button starts
and stops acquisition.
The HARDCOPY button starts print
operations. See page 3–41 for more
information about making hard copies.
The ACQUIRE button calls up the
acquisition menu. See page 3–25 for
more information about controlling
acquisition.
The CURSOR button calls up the cursor
menu. See page 3–21 for information
about making measurements with cursors.
The DISPLAY button calls up the display
menu. See page 3–27 for information
about controlling the display.
TDS 340A, TDS 360 & TDS 380 User Manual
2–5
Operating Basics
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).
Cursor measurement
readouts. See page 3–21
for more information about
cursors.
Trigger level indicator
Trigger point indicator
The side menu offers a
choice of specific
actions.
Channel ground
indicator
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.
The main menu offers a
choice of major actions.
2–6
The Time base readout shows the
time base setting. M indicates
(M)ain time base, D indicates
(D)elayed time base.
When in video-trigger mode,
the readout displays source
and trigger feature (Field 1,
Field 2, or Lines).
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
Inputs
The channel BNC inputs (CH1 and
CH2) accept electrical signals for
display.
The EXT TRIG input accepts external
trigger signals. See page 3–12 for
more information about external
triggering.
TDS 340A, TDS 360 & TDS 380 User Manual
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Operating Basics
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.
The power connector accepts line voltage
to power the instrument. See page 0–1 for
a list of power cord and connector options.
The fuse drawer holds the line fuse. See
page 1–3 for fuse replacement procedures.
You can use the Centronics, RS-232, and GPIB
interfaces to transmit hardcopy data; see page
3–41 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.
2–8
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
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 2–10 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 2–1 as necessary.
TDS 340A, TDS 360 & TDS 380 User Manual
2–9
Operating Basics
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 2–1: 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.
2–10
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
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).
H
If the function has subfunctions, they appear on the side menu (step 3).
H
The leftmost bottom menu button sometimes activates a pop-up menu
(as shown in Figure 2–2). You can cycle through the pop-up menu
options by repeatedly pressing the button. Each selection calls up
different bottom and side menus.
Figure 2–2: 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.
TDS 340A, TDS 360 & TDS 380 User Manual
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Operating Basics
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 2–3.
Figure 2–3: 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 2–4. Attach the
probe ground clip to the outer ring of the CH 2 BNC.
2–12
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
Figure 2–4: Probe compensation setup
2. Press AUTOSET. The oscilloscope displays the compensation waveform. It
should resemble the waveform shown in Figure 2–5.
Figure 2–5: Compensation waveform
TDS 340A, TDS 360 & TDS 380 User Manual
2–13
Operating Basics
3. Check that the waveform indicates correct compensation (see Figure 2–6). If
the waveform indicates over or undercompensation, use the alignment tool
provided with the probe to adjust the compensation as shown in Figure 2–7.
Probe compensated correctly
Probe overcompensated
Probe undercompensated
Figure 2–6: How probe compensation affects signals
Compensation adjustment
Figure 2–7: Location of probe compensation adjustment
2–14
TDS 340A, TDS 360 & TDS 380 User Manual
Operating Basics
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 2–8).
Autoset
Figure 2–8: The AUTOSET button
Table 2–1 specifies the changes autoset makes in your oscilloscope setup.
Table 2–1: Autoset defaults
Control
Changed by autoset to
Selected channel
If none already displayed, numerically lowest of the displayed
channels
Acquire Mode
Sample
Acquire Stop After
RUN/STOP button only
Display Style
Vectors
Display Intensity — Overall
If less than 50%, set to 75%
Display Format
YT
Horizontal Position
Centered within the graticule window
Horizontal Scale
As determined by the signal frequency
Horizontal Time Base
Main Only
Trigger Position
Unchanged
Trigger Type
Edge
Trigger Source
Numerically lowest of the displayed channels (the selected
channel)
Trigger Level
Midpoint of data for the trigger source
Trigger Slope
Positive
Trigger Coupling
DC
TDS 340A, TDS 360 & TDS 380 User Manual
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Operating Basics
Table 2–1: Autoset defaults (Cont.)
2–16
Control
Changed by autoset to
Trigger Holdoff
500 ns
Vertical Scale
As determined by the signal level
Vertical Coupling
DC unless AC was previously set;
AC remains unchanged
Vertical Bandwidth
Full
Vertical Offset
0 volts
TDS 340A, TDS 360 & TDS 380 User Manual
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
Manipulating Waveforms
H
Triggering
H
Taking Measurements
H
Controlling Acquisition
H
Controlling the Display
H
Using the FFT
H
Making Hard Copies
H
Saving and Recalling Waveforms
H
Saving and Recalling Setups
H
Using the File System
H
Using the Utility Menu
TDS 340A, TDS 360 & TDS 380 User Manual
3–1
Introduction
3–2
TDS 340A, TDS 360 & TDS 380 User Manual
Manipulating Waveforms
There are two basic ways to manipulate waveforms acquired by TDS 300 Series
oscilloscopes.
H
You can change their display parameters with the vertical and horizontal
systems
H
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 3–1.
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 3–1: The VERTICAL MENU button
TDS 340A, TDS 360 & TDS 380 User Manual
3–3
Manipulating Waveforms
Figure 3–2 shows the vertical menu.
Figure 3–2: The vertical menu
Use the vertical menu to perform these tasks.
Select Input Coupling
Invert a Waveform
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 3–3 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%.
3–4
TDS 340A, TDS 360 & TDS 380 User Manual
Manipulating Waveforms
Normal waveform
Inverted waveform
Figure 3–3: Inverting a waveform
Select Bandwidth
Press the main-menu button Bandwidth. Use the side menu to switch between
20 MHz and full bandwidth.
Make Fine V/div
Adjustments
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.
Adjust Vertical Position
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.
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.
TDS 340A, TDS 360 & TDS 380 User Manual
3–5
Manipulating Waveforms
Horizontal Operations
To access horizontal system features, press the HORIZONTAL MENU button,
shown in Figure 3–4. Figure 3–5 shows the horizontal menu.
Horizontal menu
Figure 3–4: The HORIZONTAL MENU button
Figure 3–5: The horizontal menu
3–6
TDS 340A, TDS 360 & TDS 380 User Manual
Manipulating Waveforms
Use the horizontal menu to perform these tasks.
Select the Time Base
Adjust Trigger Position
Select Fit to Screen
Press the main-menu button Time Base. Use the side menu to select from these
options:
H
Press Main Only to show only the main time base.
H
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.
H
Press Delayed Only to show only the delayed time base.
H
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.
H
Press Set to Min to set the delay time to its minimum value.
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 2–6, 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.
H
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.
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Manipulating Waveforms
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 3–6.
Math
Figure 3–6: 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 3–7 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 3–31.
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Manipulating Waveforms
Figure 3–7: A math waveform
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Manipulating Waveforms
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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 3–8.
Trigger menu
Figure 3–8: 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 3–9.
Be sure the leftmost main menu selection indicates Type Edge.
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Triggering
Figure 3–9: The edge trigger menu
Use the edge trigger menu to perform these tasks.
Select the Trigger Source
Select Trigger Coupling
3–12
Press the main-menu button Source. Use the side menu to select from these
options:
H
Press Ch1 or Ch2 to set the trigger source to one of the input channels.
H
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.
H
Press AC to set the trigger source to the oscilloscope line voltage signal.
Press the main-menu button Coupling. Use the side menu to select from these
options:
H
Press DC to select DC coupling.
H
Press AC to select AC coupling.
H
Press HF Reject to select high-frequency reject mode. High-frequency
rejection removes the high-frequency portion of the triggering signal. This
TDS 340A, TDS 360 & TDS 380 User Manual
Triggering
allows only the low-frequency components to pass on to the triggering
system. High-frequency reject mode attenuates signals above 30 kHz.
Change Trigger Slope
Adjust Trigger Level
Select Trigger Mode
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.
H
Press Noise Reject to select noise reject mode. Noise rejection provides DC
low sensitivity, but it requires additional signal amplitude for stable
triggering.
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.)
H
Press Set to TTL to automatically set the trigger level to the TTL switching
threshold.
H
Press Set to ECL to automatically set the trigger level to the ECL switching
threshold.
H
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.)
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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Triggering
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 3–10.
Figure 3–10: The video trigger menu
Use the video trigger menu to perform these tasks.
Select Trigger Source,
Mode, and Holdoff
Select Trigger Point
3–14
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
Press Field 1 to trigger on field 1 of the video signal.
H
Press Field 2 to trigger on field 2 of the video signal.
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Triggering
H
Press Any Field to trigger on any field of the video signal.
H
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 3–4).
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 3–11):
H
Press Rate 1 to select a scan rate of 15 to 20 kHz.
H
Press Rate 2 to select a scan rate of 20 to 25 kHz.
H
Press Rate 3 to select a scan rate of 25 to 35 kHz.
H
Press Rate 4 to select a scan rate of 35 to 50 kHz.
H
Press Rate 5 to select a scan rate of 50 to 65 kHz.
Figure 3–11: 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 3–12.
Measure
Figure 3–12: The MEASURE button
The MEASURE button activates the measure menu, shown in Figure 3–13.
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Taking Measurements
Figure 3–13: 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
3–13. For definitions of the available measurements, see Table 3–1.
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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Taking Measurements
Table 3–1: Measurement definitions
Name
Definition
Period
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.
Frequency
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.
Positive Width
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.
Negative Width
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.
Rise time
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.
Fall Time
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.
Positive Duty Cycle
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.
Negative Duty Cycle
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 +
Burst Width
Positive
Overshoot
Voltage measurement over the entire waveform or gated region.
PositiveOvershoot +
Negative
Overshoot
Max–High
Amplitude
100%
Voltage measurement. Measured over the entire waveform or gated region.
NegativeOvershoot + Low–Min
Amplitude
100%
High
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.
Low
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.
Maximum
Voltage measurement. The maximum amplitude. Typically the most positive peak voltage.
Measured over the entire waveform or gated region.
Minimum
Voltage measurement. The minimum amplitude. Typically the most negative peak voltage.
Measured over the entire waveform or gated region.
Peak to Peak
Voltage measurement. The absolute difference between the maximum and minimum amplitude in
the entire waveform or gated region.
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Taking Measurements
Table 3–1: Measurement definitions (Cont.)
Name
Definition
Amplitude
Voltage measurement. The high value less the low value measured over the entire waveform or
gated region.
Amplitude = High – Low
Mean
Voltage measurement. The arithmetic mean over the entire waveform or gated region.
Cycle Mean
Voltage measurement. The arithmetic mean over the first cycle in the waveform, or the first cycle in
the gated region.
Cycle RMS
Voltage measurement. The true Root Mean Square voltage over the first cycle in the waveform, or
the first cycle in the gated region.
RMS
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.
Using Gating
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.
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Taking Measurements
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
Set Reference Levels
Press the main-menu button High–Low 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.
H
Press Min–Max to set the levels to the lowest amplitude (most negative) and
highest amplitude (most positive) samples.
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
Press Set Levels in to toggle the units of the reference levels. Switch
between volts and percent.
H
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 3–14. The CURSOR
button calls up the cursor menu, shown in Figure 3–15.
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Taking Measurements
Cursor
Figure 3–14: The CURSOR button
Figure 3–15: 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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Taking Measurements
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 3–16).
Figure 3–16: 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 measured value(s) at the upper right corner of the display next to
the D sign(s). Figure 3–16 shows a sine wave with a 5.48 Vp-p and a 13.2 ms
period (6.6 ms × 2).
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Taking Measurements
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Controlling Acquisition
To access the acquisition controls, press the front panel button ACQUIRE,
shown in Figure 3–17.
Acquire
Figure 3–17: The ACQUIRE button
The ACQUIRE button activates the acquire menu, shown in Figure 3–18.
Figure 3–18: The acquire menu
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Controlling Acquisition
Use the acquire menu to perform these tasks.
Select Acquisition Mode
Press the main-menu button Mode. Use the side menu to select from these
modes.
H
Press Sample to select sample mode.
H
Press Peak Detect to select peak detect mode. Peak detect mode only
operates at horizontal SCALE settings of 25 s or slower.
H
Press Envelope to select envelope mode. Use the General Purpose Knob to
adjust the number of envelopes (2, 4, 8, 16, 32, 64, 128, 256, or R).
H
Press Average to select average mode. Use the General Purpose Knob to
adjust the number of acquisitions to average (2, 4, 8, 16, 32, 64, 128, or
256).
NOTE. Average is the only available acquisition mode if an FFT math waveform
is displayed.
Activate Single-Sequence
Mode
Press the main-menu button Stop After and then the side-menu button Single
Acquisition Sequence.
When in single-sequence mode, the oscilloscope acquires a single sequence,
displays it, and then waits for you to press the RUN/STOP button.
The definition of a sequence depends on the present acquisition mode. In sample
or peak detect mode, a sequence is a single acquisition. In envelope or average
mode, a sequence is a number of acquisitions equal to the number of envelopes
or averages.
For example, when both average and single-sequence mode are active and the
number of averages is 16, the oscilloscope collects 16 acquisitions, averages
them, displays the resulting waveform, and then stops until you press the
RUN/STOP button.
To deactivate single-sequence mode, press RUN/STOP button only in the side
menu.
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Controlling the Display
To access the display controls, press the front panel button DISPLAY, shown in
Figure 3–19.
Display
Figure 3–19: The DISPLAY button
The DISPLAY button activates the display menu, shown in Figure 3–20.
Figure 3–20: The display menu
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Controlling the Display
Use the display menu to perform these tasks.
Select Display Style
Adjust Display Intensity
Add or Remove the
Trigger ‘T’
Select Graticule Type
Select Display Format
3–28
Press the main-menu button Style. Use the side menu to select from these
display styles:
H
Press Vectors to select vector display style. The oscilloscope draws a vector
between each pair of waveform points.
H
Press Dots to select dot display mode. The oscilloscope displays only the
waveform points.
H
Press Vector Accumulate or Dot Accumulate to set the display to accumulate
dots. Use the General Purpose Knob to adjust the time limit (from 500 ms to
10 s in 250 ms increments or R). The display accumulates dots until it
reaches the time limit. It then clears the waveform and starts over. Dot
Accumulate mode shows the latest acquired waveform in dot format, while
Vector Accumulate mode shows it in vector format.
Press the main-menu button Intensity. Use the side menu to select from the
following menu items:
H
Press Overall to adjust the intensity of the screen as a whole. Use the
General Purpose Knob to vary screen intensity.
H
Toggle Text/Grat to switch the text and graticule between bright and dim.
H
Toggle Waveform to switch the waveform between bright and dim.
H
Press Contrast to adjust the contrast between the bright and dim settings. Use
the General Purpose Knob to vary the contrast level from 100% to 250%.
(When you set contrast to 200%, the dim setting is half as bright as the
bright setting.)
By default, TDS 300 oscilloscopes display a ‘T’ at the trigger point. Press the
main-menu button Readout Options and then toggle the Display ‘T’ @ Trigger
Point button to remove and add this feature.
Press the main-menu button Graticule and then use the side menu to switch
between a full graticule, a frame, a grid, or cross hairs.
Press the main-menu button Format and then use the side menu to switch
between YT and XY modes.
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Controlling the Display
Add or Remove the
Date/Time Stamp
You can display the current date and time on screen so that it appears in the
display, on hard copies you print, and with any files you store on the floppy disk.
To enable the date and time stamp in the display, do the following steps:
1. Press the front-panel button DISPLAY and then the main-menu button
Readout Options.
2. Press the side-menu button Display Date and Time to toggle the setting to
On.
3. The date and time are backed up by a battery and need not be set each time
you power up the oscilloscope. If the date and time are not correct, skip steps
4 and 5 and continue with step 1 of Setting the Date and Time on page 3–60.
Then redo this procedure.
4. Press Clear Menu to remove the menu from the display so the date and time
can be displayed. See Figure 3–39. (The date and time is removed from the
display when menus are displayed.)
5. Press HARDCOPY to print your date/time stamped hardcopy.
NOTE. To set the date and time, refer to Setting the Date and Time on page 3–60.
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Controlling the Display
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Using the FFT
Using the Fast Fourier Transform (FFT), you can transform a waveform from a
display of its amplitude against time to one that plots the amplitudes of the
various discrete frequencies the waveform contains. Use FFT math waveforms in
the following applications:
H
Testing impulse response of filters and systems
H
Measuring harmonic content and distortion in systems
H
Characterizing noise in DC power supplies
H
Analyzing vibration
H
Analyzing harmonics in 50 and 60 Hz power lines
Description
The FFT computes and displays the frequency content of a waveform you
acquire as an FFT math waveform. This frequency domain waveform is based on
the following equation:
N
–1
2
1
X(k) +
N
n+
–
x(n)e
j2nk
N
for : k + 0 to N–1
*N
2
Where: x(n) is a point in the time domain record data array
X(k) is a point in the frequency domain record data array
n is the index to the time domain data array
k is the index to the frequency domain data array
N is the FFT length
j is the square root of –1
The resulting waveform is a display of the magnitude of the various frequencies
the waveform contains with respect to those frequencies. For example, Figure 3–21 shows the non-transformed impulse response of a system in channel 1
at the top of the screen. The FFT-transformed magnitude appears in the math
waveform below the impulse. The horizontal scale for FFT math waveform is
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Using the FFT
always expressed in frequency/division with the beginning (left-most point) of
the waveform representing zero frequency (DC).
Normal waveform of an
impulse response
FFT waveform of the
magnitude response
Figure 3–21: System response to an impulse
Operation
To obtain an FFT of your waveform, do these basic tasks:
Displaying an FFT
H
Acquire and display it normally (that is, in the time domain) in your choice
of input channels.
H
Transform it to the frequency domain using the math waveform menu.
H
Use cursors or automated measurements to measure its parameters.
Perform the following steps to display an FFT math waveform:
1. Connect the waveform to the desired channel input and select that channel.
2. Adjust the vertical and horizontal scales and trigger the display (or press
AUTOSET).
The topic Offset, Position, and Scale, on page 3–37, provides in-depth
information about optimizing your setup for FFT displays.
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Using the FFT
3. Press the front-panel MATH button to display a math waveform.
4. Press the FFT side-menu button to select the FFT waveform. To select a
different source channel, press the FFT side-menu button repeatedly. See
Figure 3–22.
Figure 3–22: Define FFT waveform menu
NOTE. The FFT math waveform vertical scale factor is dBVRMS , which is dB
relative to 1 VRMS (0 dB =1 VRMS) .
5. Press the HORIZONTAL MENU button and then press the main-menu
button Fit to Screen.
6. Press the side-menu button On to display a complete frequency spectrum,
from DC to the Nyquist frequency.
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Using the FFT
Cursor Measurements of
an FFT
Once you have displayed an FFT math waveform, use cursors to measure its
frequency amplitudes.
1. Be sure MATH is selected in the channel selection buttons.
2. Press the front-panel button CURSOR, the main-menu button Function, and
then the side-menu button H Bars.
3. Use the general purpose knob to align the selected cursor (solid line) to the
top (or to any amplitude on the FFT waveform you choose).
4. Press SELECT to select the other cursor. Use the general purpose knob to
align the selected cursor to the bottom (or to any amplitude on the FFT
waveform you choose).
5. Read the amplitude between the two cursors from the D: readout. Read the
amplitude of the selected cursor relative to 1 VRMS (0 dB) from the @:
readout (See Figure 3–23).
6. Press the side-menu button V Bars. Use the general purpose knob to align
one of the two vertical cursors to a point of interest along the horizontal axis
of the waveform.
7. Press SELECT to select the alternate cursor.
8. Align the alternate cursor to another point of interest on the FFT waveform.
9. Read the frequency difference between the cursors from the D: readout.
The cursor units will always be in Hz, regardless of the setting in the Time
Units side menu.
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Using the FFT
Figure 3–23: Cursor measurement of an FFT waveform
10. Press the main-menu button Function and then the side-menu button Paired.
11. Use the technique just outlined to place the vertical bar of each paired cursor
to the points along the horizontal axis you are interested in.
12. Read the amplitude between the short horizontal bar of the two paired
cursors from the top-most D: readout. Read the amplitude of the short
horizontal bar of the selected (solid) cursor relative to 1 VRMS (0 dB) from
the @: readout. Read the frequency between the long horizontal bars of both
paired cursors from the bottom D: readout.
Automated Measurements
of an FFT
You can also use automated measurements to measure FFT math waveforms.
Use the same procedure as is found under Taking Measurements on page 3–17.
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Using the FFT
Considerations for Using FFTs
There are several characteristics of FFTs that affect how they are displayed and
should be interpreted. Read the following topics to learn how to optimize the
oscilloscope setup for good display of your FFT waveforms.
FFTs Transform Time
Records to Frequency
Records
A 1000-point time-domain record is input for the FFT. Figure 3–24 shows the
transformation of that time-domain data record into a frequency-domain record.
The resulting frequency-domain record is initially 1000 points that contain both
positive and negative frequencies. Since the negative values mirror the positive
values, only the positive 500 values are kept. Then, each value is repeated to
make a 1000-point frequency-domain record.
1000-point time-domain record
FFT
Negative frequencies
Positive frequencies
Each point duplicated
1000-point frequency-domain record
Figure 3–24: FFT time domain record vs. FFT frequency domain record
FFT Frequency Range and
Resolution
When you turn on an FFT waveform, the oscilloscope displays the magnitude of
the FFT frequency domain record. The resolution between the discrete frequencies displayed in this waveform is determined by the following equation:
F +
Sample Rate
Sample Rate
+
FFT Length
500 samples
Where: DF is the frequency resolution in Hz.
Sample Rate is the sample rate of the source waveform.
FFT Length is the number of independent points in the FFT.
The sample rate also determines the range these frequencies span; they span from
zero to one-half the sample rate of the waveform record. (The value of one-half
the sample rate is often referred to as the Nyquist frequency or point.) For
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Using the FFT
example, a sample rate of 20 Megasamples/second would yield an FFT with a
range of 0 to 10 MHz. The sample rates available for acquiring data records vary
over a range the limits of which depend on your oscilloscope model. The
oscilloscope displays the sample rate in the acquisition readout at the top of the
oscilloscope screen.
Offset, Position, and Scale
To properly display your FFT waveform, scale the source waveform so it is not
clipped.
H
You should scale and position the source waveform so it is contained on
screen. (Off screen waveforms may be “clipped,” which will result in errors
in the FFT waveform).
Alternately, to get maximum vertical resolution, you can display source
waveforms with amplitudes up to two divisions greater than that of the
screen. If you do, turn on Pk-Pk in the measurement menu and monitor the
source waveform for clipping.
H
Use vertical position and vertical offset to position your source waveform.
As long as the source waveform is not clipped, its vertical position and
vertical offset will not affect your FFT waveform except at DC. (DC
correction is discussed below.)
Normally, the output of a standard FFT computation yields a DC value that is
twice as large as it should be with respect to the other frequencies.The displayed
output of the FFT on a TDS 300 oscilloscope is corrected for these errors to
show the true value for the DC component of the input signal. The Position and
Offset must be set to zero for the source waveform in the Vertical menu. When
measuring the amplitude at DC, remember that 1 VDC equals 1 VRMS and the
display is in dB.
Undersampling (Aliasing)
Aliasing occurs when the oscilloscope acquires a source waveform with
frequency components outside of the frequency range for the current sample rate.
In the FFT waveform, the actual higher frequency components are undersampled, and therefore, they appear as lower frequency aliases that “fold back”
around the Nyquist point (see Figure 3–25).
The greatest frequency that can be input into any sampler without aliasing is
one-half the sample frequency. Since source waveforms often have a fundamental frequency that does not alias but have harmonic frequencies that do, you
should have methods for recognizing and dealing with aliases:
H
Be aware that a source waveform with fast edge transition times creates
many high frequency harmonics. These harmonics typically decrease in
amplitude as their frequency increases.
H
Sample the source signal at rates that are at least 2X that of the highest
frequency component having significant amplitude.
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Using the FFT
H
Filter the input to bandwidth limit it to frequencies below that of the Nyquist
frequency.
H
Recognize and ignore the aliased frequencies.
If you think you have aliased frequencies in your FFT, select the source channel
and adjust the horizontal scale to increase the sample rate. Since you increase the
Nyquist frequency as you increase the sample rate, the alias signals should
“unfold” and appear at their proper frequency.
Amplitude
Nyquist frequency
point
Frequency
Aliased frequencies
Actual frequencies
Figure 3–25: How aliased frequencies appear in an FFT
FFT Windows
The oscilloscope multiplies the FFT time domain record by a Hanning window
before it inputs the record to the FFT function. Figure 3–26 shows how the time
domain record is processed.
The FFT windowing acts like a bandpass filter between the FFT time domain
record and the FFT frequency domain record. The shape of the window controls
the ability of the FFT to resolve (separate) the frequencies and to accurately
measure the amplitude of those frequencies. The Hanning window is optimized
for low leakage and good amplitude measurement accuracy on the different
frequency components of the signal.
If possible, adjust the trigger position so that the most interesting parts of the
signal in the time domain record are positioned in the center region of the
window so that the tapering does not cause severe errors.
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Using the FFT
Time domain record
×
Hanning window
Time domain record after
windowing
FFT
Frequency domain record
Figure 3–26: Windowing the FFT time domain record
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Using the FFT
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Making Hard Copies
(Option 14 Equipped Instruments Only)
By using the Option 14 Communications Interface, you can make hard copies of
waveforms with the oscilloscope. To make a hard copy, connect your hard copy
device to the appropriate interface on the rear panel and press the HARDCOPY
button, shown in Figure 3–27.
Hardcopy
Figure 3–27: The HARDCOPY button
To abort a hard copy enter the System I/O menu as described in the next section
and press the main-menu button Clear Spool.
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Making Hard Copies
Configuring Hard Copy Output
Before you can successfully make a hard copy, you need to configure the hard
copy output to match your hard copy device. Use this procedure to configure the
hard copy output:
1. Press the UTILITY button, shown in Figure 3–28.
Utility
Figure 3–28: The UTILITY button
2. Repeatedly press the System main-menu button until I/O is highlighted in
the pop-up menu. This activates the system I/O menu, shown in Figure 3–29.
Figure 3–29: The system I/O menu
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Making Hard Copies
3. Press the main-menu button Hcp Port. Use the side menu to select Centronics, GPIB, or RS-232C.
4. Press the main-menu button Hcp Layout. Use the side menu to select
Landscape or Portrait.
5. Press the main-menu button Hcp Format. Use the side menu to select your
printer format (press the lowermost side-menu button, labeled –more– x of 3,
to page through the formats as necessary). Formats available are Thinkjet,
Deskjet, Laserjet, Epson, Interleaf, TIF, PCX, BMP, EPS (Encapsulated
PostScript), DPU 411/II, and DPU 412.
6. If you are using the GPIB as your hard copy port, press the main-menu
button GPIB. Then press the side-menu button Hardcopy (Talk Only).
7. If you are using the RS-232C as your hard copy port, press the main-menu
button RS-232C. Then press, in turn, each side-menu button until the desired
parameter settings are displayed in the side menu. Or, if its settings are
appropriate, press Set RS-232 Parameters to Default Values. Remember, the
parameter settings you select must be compatible with the settings of your
hardcopy device or personal computer. (For additional RS-232 information
see the TDS 340A, TDS 360 & TDS 380 Programmer Manual.)
You are now ready to make a hard copy. Press the front-panel HARDCOPY
button.
Saving a Hard Copy to Disk
You can send a “hard copy” (the screen image) to a floppy disk to use later in
your documentation. You cannot recall hard copies from the disk back into the
oscilloscope. To save a hard copy to disk do the following steps:
1. Insert a formatted 720 Kbyte or 1.44 Mbyte floppy disk into the slot at the
top of the oscilloscope.
NOTE. To format disks, delete hard copy files you save to disk, and otherwise
manage the disk storage, see Using the File System on page 3–55.
2. Press the front-panel button UTILITY and then press the main-menu button
System to select the I/O menu.
3. Press the main-menu button Hcp Port and then press the side-menu button
File. The file list and its scrollbar will appear.
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Making Hard Copies
4. Turn the general purpose knob to place the scroll bar over the file in which to
store the hard copy.
NOTE. Upon power on, the oscilloscope creates the “wild card” file
TEK?????.FMT for storing hard copies, where “.FMT” is replaced by the hard
copy format you select. Selecting this file and pressing HARDCOPY stores a
hard copy in a uniquely named, sequentially numbered file. For instance, if the
selected format is Thinkjet, the oscilloscope saves the first hard copy you save to
the file TEK00001.TJ, the second to TEK00002.TJ, and so on.
5. Press HARDCOPY to copy the screen image to the selected file.
Saving files to the floppy disk provides a convenient way to store hard copies for
later recall and display at a remote site. You can load them into your desktop
publishing software that runs on a compatible PC.
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Saving and Recalling Waveforms
You can save waveforms into and recall them from reference waveforms that
reside in nonvolatile memory. You can also save and recall waveforms to and
from files on a floppy disk.
Using Reference Waveforms
TDS 300 Series oscilloscopes have two reference waveforms. You can use the
reference waveforms to store “live” waveforms (channel and math waveforms).
You can also shift a stored waveform from one reference waveform to the other.
Reference waveforms respond just like live waveforms to changes in vertical
position and scale, but they do not respond to horizontal scale adjustments.
There is no way to horizontally expand a reference waveform.
NOTE. The TekSecure feature (page 3–59) erases both reference waveforms and
fills them with null data.
Saving to a Reference
Waveform
To save a live waveform to a reference waveform, press one of the referencewaveform buttons (REF 1 or REF 2) shown in Figure 3–30.
Ref 1
Ref 2
Figure 3–30: The reference waveform buttons
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Saving and Recalling Waveforms
If the selected reference waveform does not contain null data, it appears on the
screen. A side menu also appears; select one of these options from the side menu
(see Figure 3–31).
H
Press Save CH1 to Ref(x) to save the channel 1 waveform to the selected
reference waveform.
H
Press Save CH2 to Ref(x) to save the channel 2 waveform to the selected
reference waveform.
H
Press Save MATH to Ref(x) to save the math waveform to the selected
reference waveform.
H
Press Save Ref(y) to Ref(x) to save the unselected reference waveform to the
selected reference waveform. (For example, Ref2 to Ref1 or Ref1 to Ref2.)
H
Press Horizontal Position to toggle between the Lock and Independent
modes. In Lock mode, the horizontal position of the selected reference
waveform is locked to the live waveforms. In Independent mode, the
selected reference waveform is independently positionable.
NOTE. When saving to a reference waveform, the previous contents of the
reference waveform are overwritten.
Figure 3–31: A reference waveform menu
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Saving and Recalling Waveforms
The reference waveforms maintain their contents indefinitely, regardless of the
power state or setup of the instrument. To remove a selected reference waveform
from the display, press WAVEFORM OFF.
Recalling a Reference
Waveform
To recall a reference waveform simply press its front panel button (REF 1 or
REF 2).
Using the Disk
You can save waveforms to a floppy disk in several useful formats for mass
storage or transfer to other applications. You can recall waveforms for display as
reference waveforms.
Selecting the Save Format
To select the file format that the oscilloscope uses to save waveforms to a file,
press the front-panel button SAVE/RECALL, and then the main-menu button
Save Format. Three format choices are available using the side-menu buttons:
H
Internal creates files (.ISF) in the internal format of the oscilloscope
H
MathCad creates files (.DAT) in a format usable by MathCad
DAT files are supported by the MathCad numerical analysis program. DAT
file data is read line by line and placed into variables in the MathCad
document. You then do whatever calculations are required. The DAT format
begins with four values acting as a header containing the record length, time
per sample interval, trigger location, and trigger offset, followed by a linear
array of ASCII floating-point Y values. The recordLength, pre–trigger
sample count and trigger offset are in samples. The horizontal scale per
sample is in x units and the y value is in y units.
H
Spreadsheet creates files (.CSV) in a format usable by most spreadsheets
(Excel, Lotus 1-2-3, and Quattro Pro)
CSV files (Comma Separated Values) contain comma separated X and Y
ASCII values on CRLF terminated lines (a 2 dimensional array). Each value
is a floating point number. There is one line for each point in a waveform
record. The X and Y values are displayed in the units of seconds and Volts.
All scaling to sample increments and offsetting has been done. Zero on the X
scale is the trigger point, with negative values being pretrigger and positive
values being posttrigger.
Refer to Viewing a Waveform on a Spreadsheet on page 3–49 for an example
of using this format.
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Saving and Recalling Waveforms
Figure 3–32: Save Format menu
Saving a Waveform to the
Disk
To store a waveform to disk, insert a formatted 720 Kbyte or 1.44 Mbyte floppy
disk into the slot at the top of the oscilloscope. Press the main-menu button Save
Wfm and then the side-menu button To File. Use the general purpose knob to
select the exact file from the resulting scrollbar list. Finally, press the side-menu
button Save To Selected File to complete the operation.
Recalling a Waveform
from the Disk
To recall a waveform from disk to an internal reference memory, press the
front-panel button SAVE/RECALL and then the main-menu button Recall Wfm
To Ref. Use the general purpose knob to select the exact file from the resulting
scrollbar list. Only files with .ISF extensions are displayed. Finally, press either
the side-menu button To Ref1 or To Ref2 to complete the operation.
NOTE. You can only recall waveforms saved with the .ISF extension. You cannot
read files saved with .DAT or .CSV extensions back into the oscilloscope.
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Saving and Recalling Waveforms
Viewing a Waveform on a Spreadsheet
To save a waveform and view the waveform data using a spreadsheet (this
example uses EXCEL):
1. With a disk in the disk drive, press the front-panel button SAVE/RECALL,
the main-menu button Save Format, and then the side-menu button
Spreadsheet.
2. Press the main-menu button Save Wfm, the side-menu button To File, and
then the side-menu button Save to Selected File.
3. Remove the disk and place it in your computer drive.
4. Start EXCEL.
5. Using the EXCEL File menu, select Open. From the List Files of Type
menu, select Text Files (*.prn, *.txt, *.csv). From the Drives menu, select
the drive containing the waveform file. From the File Name menu, select the
name of the waveform file. Now select OK.
For information on the CSV data format, see Selecting the Save Format on
page 3–47.
Running the File Utilities
To run file utilities, see Using the File System on page 3–55.
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Saving and Recalling Waveforms
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Saving and Recalling Front-Panel Setups
TDS 300 Series oscilloscopes can store up to ten front-panel setups in internal
memory for an indefinite period. You can also save and recall setups to and from
a floppy disk. To access front-panel save and recall features, press the SAVE/RECALL button, shown in Figure 3–33.
Save/Recall
Figure 3–33: The SAVE/RECALL button
Pressing the button activates the save/recall menu, shown in Figure 3–34.
Figure 3–34: The save/recall menu
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Saving and Recalling Front-Panel Setups
Using Internal Memory
Internal, nonvolatile memory contains locations to store up to ten oscilloscope
setups.
NOTE. The Tek Secure feature (page 3–59) will erase all saved setups.
Saving the Current Setup
Recalling a Setup
To save the current setup, press the front-panel button SAVE/RECALL and then
the main-menu button Save Current Setup. Select a setup from the side menu
(press the lowermost side-menu button, labeled –more– x of 3, to page through
the setups). Finally, press the side-menu button OK Overwrite Saved Setup.
To recall a setup from internal memory, press the front-panel button SAVE/RECALL and then press the main-menu button Recall Saved Setup. Select a
destination setup memory from the side menu (press the lowermost side-menu
button, labeled –more– x of 3, to page through the setups).
Recalling a setup does not change the menu that is currently displayed. If you
recall a setup that is labeled factory in the side menu, you recall the factory
setup. (The conventional method for recalling the factory setup is described
below.)
Recalling the Factory
Setup
3–52
To recall the default factory setup, press the front-panel button SAVE/RECALL
and then press the main-menu button Recall Factory Setup. Press the side-menu
button OK Confirm Factory Init to complete the initialization.
TDS 340A, TDS 360 & TDS 380 User Manual
Saving and Recalling Front-Panel Setups
Using the Disk
The disk drive can provide mass storage for an unlimited number of oscilloscope
setups.
NOTE. Setups are not transferable between different oscilloscope models or
software versions.
Saving the Current Setup
To save a setup on a formatted disk, insert a formatted 720 Kbyte or 1.44 Mbyte
floppy disk into the slot at the top of the oscilloscope. Press the front-panel
button SAVE/RECALL, the main-menu button Save Setup, and then the
side-menu button To File. Use the general purpose knob to select the exact file
from the resulting scrollbar list. Finally, press the side-menu Save To Selected
File to complete the operation.
Recalling a Setup
To recall a setup stored on disk, press the front-panel button SAVE/RECALL,
the main-menu button Recall Setup, and then the side-menu button From File.
Use the general purpose knob to select the exact file from the resulting scrollbar
list. Only files with .set extensions will be displayed. Finally, press the sidemenu Recall From Selected File to complete the operation.
Running the File Utilities
To run file utilities, see Using the File System on page 3–55.
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Saving and Recalling Front-Panel Setups
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Using the File System
The TDS 300 oscilloscopes provide file utilities and a floppy disk drive for
saving hard copies, setups, and waveforms. This section describes how to
manage (delete, rename, and so forth) these files using the file system. Read the
sections listed under For More Information on page 3–58 for information on
saving hard copies, setups, and waveforms.
Accessing the File Utilities
The File Utilities menu lets you delete, rename, copy, print files, create a new
directory, operate the confirm delete and overwrite lock, and format disks.
To bring up the File Utilities menu:
1. Press the SAVE/RECALL button.
2. Press File Utilities in the main menu to bring up the File Utilities side menu.
(See Figure 3–35.)
Figure 3–35: File utilities
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Using the File System
NOTE. The amount of free space on the disk is shown in the upper right corner of
the display. The display shows the amount in Kbytes (or in Mbytes if the free
space is 1 Mbyte or more).
Bytes are only shown if the free space is less than 1 Kbyte. Kbytes are only
shown if the free space is 1 Kbyte or more, but less than 1 Mbyte. 1 Mbyte is
shown if the free space is 1 Mbyte or more.
Deleting a File or
Directory
To delete a file or directory, turn the general purpose knob until it scrolls the
cursor over the name of the file or directory to delete. Then, press the side-menu
button Delete.
To delete all files in the file list, set the cursor to the *.* selection.
The oscilloscope deletes directories recursively. That means it deletes both the
directory and all its contents.
Renaming a File or
Directory
To rename a file or directory, turn the general purpose knob until it scrolls the
cursor over the name of the file or directory to rename. For example, to rename
the target file whose default name is set the cursor over its name.
Then, press the side-menu button Rename.
The labelling menu should appear. Turn the general purpose knob or use the
main-menu arrow keys to select each letter. Press Enter Char from the main
menu to enter each letter. When you have entered the name, press the side–menu
button OK Accept. (See Figure 3–36).
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Using the File System
Figure 3–36: File system — Labelling menu
Copying a File or
Directory
To copy a file or directory, turn the general purpose knob until it scrolls the
cursor over the name of the file to copy. Then, press the side menu button Copy.
The file menu reappears with the names of directories to copy to. Select a
directory and press the side-menu button Copy <name> to Selected Directory.
To copy all files, select the *.* entry.
The oscilloscope copies all directories recursively. That means it copies both the
directory and all its contents.
Printing a File
To print a file, turn the general purpose knob until it scrolls the cursor over the
name of the file to print. Then, press the side-menu button Print.
The Print-To side menu should appear. Select the port to print to from GPIB,
RS-232, or Centronics. (See Figure 3–36.) Then the oscilloscope sends the file in
its raw form out the port. The device (printer) receiving the file must be capable
or printing the particular file format.
Creating a Directory
To create a new directory, press the side-menu button Create Directory.
The labelling menu appears. Turn the general purpose knob or use the mainmenu arrow keys to select each letter. Press Enter Char from the main menu to
enter each letter. When you have entered the name, press the side-menu button
OK Accept. (See Figure 3–36.)
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Using the File System
Setting Confirm Delete
To turn on or off the confirm delete message, toggle the side-menu button
Confirm Delete.
When the confirm delete option is OFF, the oscilloscope can immediately delete
files or directories. When the confirm option is ON, the oscilloscope warns you
before it deletes files and gives you a chance to reconsider.
Setting Override Lock
To turn on or off the file overwrite lock, toggle the side-menu button Overwrite
Lock.
When overwrite lock is on, the oscilloscope will not permit you to write over an
existing file of the same name. An important reason to allow overwriting is to let
you write files using a target file name that contains wild card characters (“?”).
This means the oscilloscope creates sequential files whose names are similar
except for the sequential numbers that go in the real name in the place of the
question marks.
Formatting a Disk
For More Information
To format a 720 Kbyte or 1.44 Mbyte disk, turn the general purpose knob until it
scrolls the cursor over the name of the drive to format in. (fd0:) Then, press the
side-menu button Format.
See Making Hard Copies, on page 3–41.
See Saving and Recalling Front-Panel Setups, on page 3–51.
See Saving and Recalling Waveforms, on page 3–45.
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Using the Utility Menu
The utility menu is actually four menus in one. Access these menus by pressing
the UTILITY button (Figure 3–37) and then the leftmost main-menu button. The
pop-up menu (see Figure 3–38) shows these options.
H
The Config menu offers Tek Secure (which overwrites all setup and
reference memories) and the software version identifier as main menu
selections.
H
The I/O menu (Option 14 instruments only) pertains to making hardcopies
(see page 3–41) and remote operations (refer to the TDS 340A, TDS 360 &
TDS 380 Programmer Manual).
H
The Cal menu, which you should only use in conjunction with the adjustment procedures.
H
The Diag menu, which you should only use in conjunction with the Self
Test.
Utility
Figure 3–37: The UTILITY button
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Using the Utility Menu
Figure 3–38: The utility pop-up menu
Setting the Date and Time
If you need to set the date and time of the oscilloscope, do the following steps:
1. Press the front-panel button UTILITY, the main-menu button System, and
then select the popup-menu item Config
2. Press the main-menu button Set Date & Time.
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Using the Utility Menu
.
Date and Time display
Figure 3–39: Date and time display
3. Press the side-menu button Year, Day Month, Hour, or Minute. Use the
general purpose knob to set the parameter you have chosen to the value
desired.
4. Repeat step 3 to set other parameters as desired.
5. Press the side menu button OK Enter Date/Time to put the new settings into
effect. This sets the seconds to zero.
NOTE. When setting the clock, you can set to a time slightly later than the
current time and wait for it to catch up. When current time catches up to the time
you have set, pressing Ok Enter Date/Time synchronizes the set time to the
current time.
6. Press CLEAR MENU to see the date/time displayed with the new settings. If
the date and time is not in the display, you need to enable it. Refer to Add or
Remove Date/Time Stamp on page 3–29 for information about how to enable
the date and time display.
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Using the Utility Menu
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Appendices
Appendix A: Specifications
This appendix contains complete specifications for the TDS 340A, TDS 360, and
TDS 380. The specifications are divided into three subsections, one for each of
three classes of traits: Warranted Characteristics, Typical Characteristics, and
Nominal Traits.
Warranted Characteristics
Warranted characteristics are described in terms of quantifiable performance
limits that are warranted. This subsection lists only warranted characteristics.
NOTE. In these tables, those warranted characteristics that are checked in the
Performance Tests, starting on page 0–5, appear in boldface type under the
column Name.
Performance Conditions
The electrical characteristics found in these tables of warranted characteristics
apply when the oscilloscope has been adjusted at an ambient temperature
between +20_ C and +30_ C, has had a warm-up period of at least 20 minutes,
and is operating at an ambient temperature between –10_ C and +55_ C (unless
otherwise noted).
Table A–1: Warranted characteristics — signal acquisition system
The minimum single pulse widths for guaranteed 50% or greater amplitude capture are as follows:
Name
Description
Accuracy, DC Voltage Measurement,
Ave age A
Average
Acquisition
q i i i Modee
Measurement type
DC accuracy
Average of ≥16 waveforms
±(2.0% × |(reading – Net Offset1)| + Offset
Accuracy + 0.1 div)
Delta volts between any two averages of
≥16 waveforms acquired under the same
setup and ambient conditions
±(2.0% × |reading| + 0.15 div + 0.3 mV)
Accuracy, DC Gain, Sample or
Average Acquisition Modes
±2%
Pulse Response, Peak Detect and
Envelope
vel pe Modee
Sec/Div setting
Minimum pulse width
5 s/div – 25 ms/div
10 ns
TDS 340A: 10 ms/div – 5 ns/div
TDS 360: 10 ms/div – 2.5 ns/div
TDS 380: 10 ms/div – 1 ns/div
The greater of 10 ns or
0.02 × sec/div setting
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Appendix A: Specifications
Table A–1: Warranted characteristics — signal acquisition system (Cont.)
The minimum single pulse widths for guaranteed 50% or greater amplitude capture are as follows:
Name
Description
Accuracy, Offset
Volts/Div setting
Offset accuracy
2 mV/div – 99.5 mV/div
±(0.4% × |Net Offset1|
+ 3 mV + 0.1 div × V/div setting)
100 mV/div – 995 mV/div
±(0.4% × |Net Offset1|
+ 30 mV + 0.1 div × V/div setting)
1 V/div – 10 V/div
±(0.4% × |Net Offset1|
+ 300 mV + 0.1 div × V/div setting)
Analog Bandwidth, DC Coupled
TDS 340A: DC – ≥100 MHz
TDS 360: DC – ≥200 MHz; DC – ≥180 MHz for 2 mV/div
TDS 380: DC – ≥400 MHz; DC – ≥250 MHz for 2 mV/div
Cross Talk (Channel Isolation)
≥100:1 at 50 MHz with equal Volts/Div settings on each channel
Input Impedance, DC-Coupled
TDS 340A: 1 MW ±1% in parallel with 20 pF ±2.0 pF
TDS 360: 1 MW ±1% in parallel with 20 pF ±2.0 pF
TDS 380: 1 MW ±1% in parallel with 12 pF ±2.0 pF
Input Voltage, Maximum
±300 V (DC or AC) CAT II; derate at 20 dB/decade above 100 kHz to 13 V peak AC at
3 MHz and above
Lower Frequency Limit, AC Coupled2
≤10 Hz
1
Net Offset = Offset – (Position × Volts/Div). Net offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.
2
The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X, passive probes are used.
Table A–2: Warranted characteristics — time base system
Name
Description
Accuracy, Long Term Sample Rate and
Delay Time
±100 ppm over any ≥1 ms interval
Accuracy, Delta Time Measurements1, 2
For single-shot acquisitions using sample acquisition mode and a bandwidth limit setting
of FULL:
±(1 WI + 100 ppm × |Reading| + 0.6 ns)
For repetitive acquisitions using average acquisition mode with ≥16 averages and a
bandwidth limit setting of FULL:
±(1 WI + 100 ppm × |Reading| + 0.4 ns)
1
For input signals ≥5 divisions in amplitude and a slew rate of ≥2.0 divisions/ns at the delta time measurement points.
Signal must be acquired at a volts/division setting ≥5 mV/division.
2
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for Sample
Rate Range and Equivalent Time or Interpolated Waveform Rates in Table A–11 on page A–8.
A–2
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix A: Specifications
Table A–3: Warranted characteristics — triggering system
Name
Description
Accuracy, Trigger Level, DC Coupled
Trigger source
Sensitivity
CH1 or CH2
±(3% of |Setting – Net Offset1| + 0.2 div ×
volts/div setting + Offset Accuracy)
External
±(6% of |Setting| + 20 mV)
External/10
±(6% of |Setting| + 200 mV)
Trigger source
Sensitivity
CH1 or CH2
TDS 340A: 0.35 division from DC to 20
MHz, increasing to 1 div at 100 MHz
Sensitivity, Edge-Type Trigger, DC
Coupled
ple
TDS 360: 0.35 division from DC to 50 MHz,
increasing to 1 div at 200 MHz
TDS 380: 0.35 division from DC to 50 MHz,
increasing to 1 div at 400 MHz
External
TDS 340A: 50 mV from DC to 20 MHz,
increasing to 150 mV at 100 MHz
TDS 360: 50 mV from DC to 50 MHz,
increasing to 150 mV at 200 MHz
TDS 380: 50 mV from DC to 50 MHz,
increasing to 500 mV at 400 MHz
External/10
TDS 340A: 500 mV from DC to 20 MHz,
increasing to 1.5 V at 100 MHz
TDS 360: 500 mV from DC to 50 MHz,
increasing to 1.5 V at 200 MHz
TDS 380: 500 mV from DC to 50 MHz,
increasing to 5.0 V at 400 MHz
Input Impedance, External Trigger
1 MW ±2% in parallel with 20 pF ±2 pF
Maximum Input Voltage,
External Trigger
±300 V (DC or AC) CAT II; derate at 20 dB/decade above 100 kHz to 13 V peak AC at
3 MHz and above
1
Net Offset = Offset – (Position × Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.
Table A–4: Power Requirements
Name
Description
Source Voltage and Frequency
90 to 132 VACRMS, continuous range, for 47 Hz through 440 Hz
132 to 250 VACRMS, continuous range, for 47 Hz through 63 Hz
Power Consumption
≤65 Watts (120 VA)
TDS 340A, TDS 360 & TDS 380 User Manual
A–3
Appendix A: Specifications
Table A–5: Warranted characteristics — environmental
Name
Description
Atmospherics
Temperature without diskette in floppy disk drive:
+4_ C to +50_ C, operating;
–22_ C to +60_ C, non-operating
Temperature with diskette in floppy disk drive:
+10_ C to +50_ C, operating or non-operating
Relative humidity without diskette in floppy disk drive:
to 80% at or below +29_ C, or to 20% from +30_ C to +50_ C, operating;
to 90% at or below +40_ C, or to 5% from +41_ C to +50_ C, non-operating;
Relative humidity with diskette in floppy disk drive:
to 80% at or below +29_ C, or to 20% from +30_ C to +50_ C, operating or
non-operating
Altitude:
To 15,000 ft (4570 m), operating;
to 40,000 ft (12190 m), non-operating
Dynamics
Random vibration without diskette in floppy disk drive:
0.31 g RMS, from 5 to 500 Hz, 10 minutes each axis, operating;
2.46 g RMS, from 5 to 500 Hz, 10 minutes each axis, non-operating
A–4
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix A: Specifications
Typical Characteristics
Typical characteristics are described in terms of typical or average performance.
Typical characteristics are not warranted.
Table A–6: Typical characteristics — signal acquisition system
Name
Description
Accuracy, DC Gain, Envelope
Acquisition Mode
±3% for sec/div settings from 5 Sec/Div to 25 msec/div;
±2% for sec/div settings from 10 ms/div to 5 ns/div (TDS 340A);
±2% for sec/div settings from 10 ms/div to 2.5 ns/div (TDS 360);
±2% for sec/div settings from 10 ms/div to 1 ns/div (TDS 380)
Accuracy, DC Voltage Measurement,
S m le Ac
isitio Mode
o e
Sample
Acquisition
Measurement type
DC accuracy
Any Sample
±(2.0% × (|reading – Net Offset1|) + Offset
Accuracy + 0.13 div + 0.6 mV)
Delta Volts between any two samples2
acquired under the same setup and
ambient conditions
±(2.0% × |reading| + 0.26 div + 1.2 mV)
Frequency Limit, Upper, 20 MHz Bandwidth Limited
20 MHz
Step Response Settling Error
Volts/Div
setting
e i g
Step
a pli e
amplitude
Settling error (%)3
100 ns
20 ms
2 mV/div – 99.5 mV/div
≤2 V
≤1.0
≤0.1
100 mV/div – 995 mV/div
≤20 V
≤1.5
≤0.2
1 V/div – 10 V/div
≤200 V
≤2.5
≤0.2
Common Mode Rejection Ratio (CMRR)
100:1 at 60 Hz, reducing to 20:1 at 50 MHz, with equal Volts/Div and Coupling settings
on each channel.
1
Net Offset = Offset – (Position × Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.
2
The samples must be acquired under the same setup and ambient conditions.
3
The values given are the maximum absolute difference between the value at the end of a specified time interval after the
mid-level crossing of the step, and the value one second after the mid-level crossing of the step, expressed as a
percentage of the step amplitude.
TDS 340A, TDS 360 & TDS 380 User Manual
A–5
Appendix A: Specifications
Table A–7: Typical characteristics — triggering system
Name
Description
Error, Trigger Position, Edge Triggering
Acquire mode
Trigger-position error1,2
Sample, Average
±(1 WI + 2 ns)
Peak Detect, Envelope
±(2 WI + 2 ns)
Source
Typical sensitivity
CH1 or CH2
External
External/10
0.6 division of video sync signal
75 mV of video sync signal
750 mV of video sync signal
Sensitivity, Video-Type Trigger
Lowest Frequency for Successful Operation 50 Hz
of “Set Level to 50%” Function
Sensitivity, Edge Type Trigger, Not DC
Coupled
o le 3
Trigger coupling
Typical signal level for stable triggering
AC
Same as DC-coupled limits4 for frequencies above
60 Hz. Attenuates signals below 60 Hz.
Noise Reject
Three and one half times the DC-coupled limits.4
High Frequency Reject
One and one half times times the DC-coupled limits4
from DC to 30 kHz. Attenuates signals above 30 kHz.
Low Frequency Reject
One and one half times the DC-coupled limits4 for
frequencies above 80 kHz. Attenuates signals below
80 kHz.
1
The trigger position errors are typically less than the values given here. These values are for triggering signals having a
slew rate at the trigger point of ±0.5 division/ns.
2
The waveform interval (WI) is the time between the samples in the waveform record. Also, see the footnote for the
characteristics Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table A–11 on page A–8.
3
The minimum sensitivity for obtaining a stable trigger. A stable trigger results in a uniform, regular display triggered on
the selected slope. The trigger point must not switch between opposite slopes on the waveform, and the display must not
“roll” across the screen on successive acquisitions. The TRIG’D LED stays constantly lighted when the SEC/DIV setting
is 2 ms or faster but may flash when the SEC/DIV setting is 10 ms or slower.
4
See the characteristic Sensitivity, Edge-Type Trigger, DC Coupled in Table A–3, which begins on page A–3.
Table A–8: Typical characteristics — probe compensator output
Name
Description
Output Voltage and Frequency,
Pro e Compensator
om e s tor
Probe
Characteristic
A–6
Voltage
5.0 V (low-high) into a 1 MW load
Frequency
1 kHz
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix A: Specifications
Table A–9: Typical characteristics — data handling
Name
Description
Time, Data-Retention, Nonvolatile
Memory1,2
≥5 Years
1
The time that reference waveforms, stored setups, and calibration constants are retained when there is no power to the
oscilloscope.
2
Data is maintained by a lithium poly-carbon monofluoride battery.
Nominal Traits
Nominal traits are described using simple statements of fact such as “Two,
identical” for the trait “Input Channels, Number of,” rather than in terms of
limits that are performance requirements.
Table A–10: Nominal traits — signal acquisition system
Name
Description
Bandwidth Selections
20 MHz and FULL
Digitizers, Number of
Two, identical, digitized simultaneously
Digitized Bits, Number of
8 bits1
Input Channels, Number of
Two, identical, called CH 1 and CH 2
Input Coupling
DC, AC, or GND
Ranges, Offset, All Channels
Volts/Div setting
Offset range
2 mV/div – 99.5 mV/div
±1 V
100 mV/div – 995 mV/div
±10 V
1 V/div – 10 V/div
±100 V
Range, Position
±5 divisions
Range, Sensitivity2
2 mV/div to 10 V/div
Rise Time
TDS 340A: 3.5 ns
TDS 360: 1.75 ns
TDS 380: 875 ps
TekProbe Interface
Level one probe coding
1
Displayed vertically with 25 digitization levels (DLs) per division and 10.24 divisions dynamic range with zoom off. A DL
is the smallest voltage level change that the 8-bit A-D Converter can resolve, with the input scaled to the volts/division
setting of the channel used. Expressed as a voltage, a DL is equal to 1/25 of a division times the volts/division setting.
2
The sensitivity ranges from 2 mV/div to 10 V/div in a 1–2–5 sequence of coarse settings. Between consecutive coarse
settings, the sensitivity can be finely adjusted with a resolution of 1% of the more sensitive setting. For example, between
50 mV/div and 100 mV/div, the volts/division can be set with 0.5 mV resolution.
TDS 340A, TDS 360 & TDS 380 User Manual
A–7
Appendix A: Specifications
Table A–11: Nominal traits — time base system
Name
Description
Range, Sample-Rate1,2
TDS 340A: 10 Samples/s to 500 MSamples/s in a 1–2–5 sequence
TDS 360: 10 Samples/s to 1 GSamples/s in a 1–2–5 sequence
TDS 380: 10 Samples/s to 2 GSamples/s in a 1–2–5 sequence
Range, Seconds/Division
TDS 340A: 5 ns/div to 5 s/div in a 1–2.5–5 sequence
TDS 360: 2.5 ns/div to 5 s/div in a 1–2.5–5 sequence
TDS 380: 1 ns/div to 5 s/div in a 1–2.5–5 sequence
Range, Time Base Delay Time
16.5 ns to 50 seconds
Record Length
1,000 samples
1
The range of real-time rates, expressed in samples/second, at which a digitizer samples signals at its inputs and stores
the samples in memory to produce a record of time-sequential samples
2
The Waveform Rate (WR) is the equivalent sample rate of a waveform record. For a waveform record acquired by
real-time sampling of a single acquisition, the waveform rate is the same as the real-time sample rate; for a waveform
created by interpolation of real-time samples from a single acquisition or by equivalent-time sampling of multiple
acquisitions, the waveform rate is faster than the real time sample rate. For all three cases, the waveform rate is
1/(Waveform Interval) for the waveform record, where the waveform interval (WI) is the time between the samples in the
waveform record.
Table A–12: Nominal traits — triggering system
Name
Description
Range, Hold Off
500 ns minimum to 10 seconds maximum
Ranges, Trigger Level
Source
Range
Any Channel
±12 divisions from center of screen
External
±1.5 Volts
External /10
±15 Volts
Line
±300 Volts
Formats and Field Rates, Video Trigger
Triggers from sync-negative composite video, 525 to 625 lines, 50 Hz to 60 Hz, interlaced
or noninterlaced systems with scan rates from 15 kHz to 65 kHz – such as NTSC, PAL, or
SECAM
TekProbe Interface, External Trigger
Level one probe coding
A–8
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix A: Specifications
Table A–13: Nominal traits — display system
Name
Description
CRT Type
7-inch (17.95 cm) diagonal, magnetic deflection; horizontal raster-scan; P31 green
phosphor
Video Display Resolution
640 pixels horizontally by 480 pixels vertically
Display area is 5.04 inch (12.92 cm) horizontally by 3.78 inch (9.69 cm) vertically
Waveform Display Graticule
A single graticule 401 × 501 pixels (8 × 10 divisions, with divisions that are approximately
1 cm by 1 cm)
Intensity Levels
Dim and Bright, with adjustable Overall Intensity and Contrast
Table A–14: Nominal traits — I/O interface option
Name
Description
GPIB
Part of Option 14 I/O interface or TD3F14A I/O interface field upgrade kit; complies with
IEEE Std 488–1987
RS-232
Part of Option 14 I/O interface or TD3F14A I/O interface field upgrade kit; a 9-pin male
DTE RS-232 interface that complies with EIA/TIA 574–90
Centronics
Part of Option 14 I/O interface or TD3F14A I/O interface field upgrade kit; a 25-pin, IBM
PC-type, parallel printer interface that complies electrically with Centronics C332–44,
Rev A
Video Signal Output
(Option 14 Only)
DB-9 rear panel Video connector; non-interlaced, with levels that comply with ANSI
RS343A
VGA compatible at a 30.6 kHz sync rate
Power Supply, Printer
(Option 14 Only)
Power supply connector to supply power to the Option 3P Printer Pack
Table A–15: Nominal traits — power distribution system
Name
Description
Fuse Rating
5 mm × 20 mm, 3.15 A (T), 250 V; or 1.25 in × 0.25 in, 3 A (T), 250 V
TDS 340A, TDS 360 & TDS 380 User Manual
A–9
Appendix A: Specifications
Table A–16: Nominal traits — mechanical characteristics
Name
Description
Weight
Standard
7.0 kg (15.5 lbs) stand-alone instrument;
8.6 kg (19 lbs) with front cover, accessories, and accessories pouch installed;
12.9 kg (28.5 lbs) when packaged for domestic shipment
Rackmount
6.6 kg (14.5 lbs), plus weight of rackmount parts (Option 1R);
14.7 kg (32.5 lbs) when the rackmounted oscilloscope is packaged for domestic shipment
Rackmount conversion kit
4.5 kg (10 lbs); 7.5 kg (17.5 lbs) when kit is packaged for domestic shipment
Overall Dimensions
Standard Instrument (Figure A–1)
Rackmount Instrument
A–10
Height:
191 mm (7.5 in) with feet and accessories pouch installed
165 mm (6.5 in) without the accessories pouch installed
Width:
362 mm (14.25 in) with handle
Depth:
471 mm (18.55 in) stand-alone instrument
490 mm (19.28 in) with front cover installed
564 mm (22.2 in) with handle extended
Height: 178 mm (7 in)
Width: 483 mm (19 in)
Depth: 472 mm (18.6 in) without handles; 517 mm (20.35 in) including handles
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix A: Specifications
471 mm
(18.55 in.)
327.2 mm
(12.88 in.)
165 mm
(6.5 in.)
308.1 mm
(12.13 in.)
569 mm
(22.4 in.)
381 mm
(15 in.)
Figure A–1: TDS 340A, TDS 360, and TDS 380 dimensions
TDS 340A, TDS 360 & TDS 380 User Manual
A–11
Appendix A: Specifications
Table A–17: Certifications and compliances
EC Declaration of Conformity
Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility and Low Voltage Directive
73/23/EEC for Product Safety. Compliance was demonstrated to the following specifications as
listed in the Official Journal of the European Communities:
EMC Directive 89/336/EEC:
EN 55011
EN 50081-1 Emissions:
EN 60555-2
EN 50082-1 Immunity:
IEC 801-2
IEC 801-3
IEC 801-4
IEC 801-5
Class B Radiated and Conducted Emissions 1
AC Power Line Harmonic Emissions
Electrostatic Discharge Immunity
RF Electromagnetic Field Immunity 2
Electrical Fast Transient/Burst Immunity
Power Line Surge Immunity
Low Voltage Directive 73/23/EEC:
EN 61010-1
Safety requirements for electrical equipment for measurement,
control, and laboratory use
Certifications
1
To maintain emission requirements when connecting to the I/O interface of this oscilloscope,
use only a high-quality, double-shielded (braid and foil) cable. The cable shield must have
low-impedance connections to both connector housings. The VGA cable must also have a
ferrite core at both ends. Acceptable cables are listed in Table C–6 on page 0–4.
2
Performance criteria: ≤±0.3 division waveform displacement, or ≤0.6 division increase in p-p
noise from 27 MHz to 500 MHz. Test conditions: both channel inputs terminated with
grounding caps, both channels set to 10 mV/div, both channels set to DC Coupling, trigger
source set to CH 1, acquisition mode set to Sample, and time base set to 250 ms/div.
Underwriters Laboratories listing to Standard UL3111–1 for Electrical Measuring and Test
Equipment. 3 4
Canadian Standards Association certified to Standard CAN/CSA-C22.2 No. 1010.1–92. 3
3
These standards are North American interpretations of IEC 1010.
4
Conditions for certification: operating temperature –10_ C to +55_ C, maximum operating
altitude 2000 m, Safety Class I (IEC 1010-1 Annex H), Overvoltage Catagory II (IEC 1010-1
Annex J), Pollution Degree 2 (IEC 1010-1).
FCC Compliance
Emissions comply with FCC Code of Federal Regulations 47, Part 15, Subpart B, Class A Limits
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.
Overvoltage Category
Category:
Examples of Products in this Category:
CAT III
Distribution-level mains, fixed installation
CAT II
Local-level mains, appliances, portable equipment
CAT I
Signal levels in special equipment or parts of equipment, telecommunications, electronics
Pollution Degree 2
A–12
Do not operate in environments where conductive pollutants may be present.
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
The procedure in this appendix verifies that the TDS 340A, TDS 360, and
TDS 380 oscilloscopes meet warranted specifications. Depending on what you
want to accomplish, you may prefer to perform another procedure you can find
elsewhere in this manual.
H
To rapidly confirm that this oscilloscope functions, just do the procedures
under Self Tests, which begin on page 1–5.
Advantages: This procedure is quick to do, requires no external equipment
or signal sources, and performs extensive functional and accuracy testing to
provide high confidence that the oscilloscope performs properly. You can use
it as a quick check before making a series of important measurements.
H
To further check functionality, do the procedures under Functional Tests that
begin on page 1–7.
Advantages: These procedures require minimal additional time to perform,
require no additional equipment other than a standard-accessory probe, and
more completely test the internal hardware of this oscilloscope. You can use
them to quickly determine if the oscilloscope is suitable for putting into
service, such as when it is first received.
H
If you need a more extensive confirmation of performance, do the Performance Tests in this appendix, beginning on page B–5, after doing the
Functional and Self Tests just referenced.
Advantages: These procedures add direct checking of warranted specifications. They require more time and suitable test equipment. (See Equipment
Required on page B–3.)
Conventions
Throughout these procedures the following conventions apply:
H
Each test procedure uses the following general format:
Title of Test
Equipment Required
Time Required
Prerequisites
Procedure
H
Refer to Figure B–1: “Main menu” refers to the menu that labels the seven
menu buttons under the display. “Side menu” refers to the menu that labels
TDS 340A, TDS 360 & TDS 380 User Manual
B–1
Appendix B: Performance Verification
the five buttons to the right of the display. “Pop-up menu” refers to a menu
that pops up when a main menu button is pressed.
H
Where instructed to use a front-panel button or knob, select from a main or
side menu, or verify a readout or status message, the name of the button or
knob appears in boldface type.
H
Instructions for menu selection follow this format: FRONT PANEL
BUTTON ! Pop-Up (if necessary) ! Main Menu Button ! Side Menu
Button. For example, “Push TRIGGER MENU ! Type: Video ! Trigger On ! Lines.”
STOP. This symbol denotes information you must read to do the procedure
properly.
Side Menu
Pop-Up Menu
Main Menu
Figure B–1: Menu locations
B–2
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
Test Equipment
These procedures use external, traceable signal sources to directly check
instrument performance. If your test equipment does not meet the minimum
requirements listed in Table B–1, your test results will be invalid.
Table B–1: Test equipment
Item number
and description
Minimum requirements
Example
Purpose
1.
Termination 50 W
(two required)
Impedance 50 W; connectors:
female BNC input, male BNC
output
Tektronix part number
011-0049-01
Checking delay between
channels
2.
Cable, Precision Coaxial
(two required)
50 W, 91 cm (36 in), male to
male BNC connectors
Tektronix part number
012-0482-00
Signal interconnection
3.
Connector,
Dual-Banana
Female-BNC to dual-banana
Tektronix part number
103-0090-00
Several accuracy tests
4.
Connector,
BNC “T”
Male-BNC to dual-female-BNC
Tektronix part number
103-0030-00
Checking trigger sensitivity
5.
Coupler,
Dual-Input
Female-BNC to dual-male-BNC
Tektronix part number
067-0525-02
Checking delay between
channels
6.
Generator, DC Calibration
Variable amplitude to ±110 V;
accuracy to 0.1%
Wavetek 9100 Calibration
System with Option 250
Checking DC offset, gain, and
measurement accuracy
7.
Generator,
Leveled Sine Wave,
Medium-Frequency
200 kHz to 250 MHz; variable
amplitude from 5 mV to 4 Vp-p
into 50 W
Wavetek 9100 Calibration
System with Option 250
Checking bandwidth and trigger
sensitivity
8.
Generator,
Leveled Sine Wave,
High-Frequency1
200 kHz to 400 MHz; variable
amplitude from 5 mV to 4 Vp-p
into 50 W
Rohde & Schwarz SMY with
URV 35 Power Meter and
NRV–Z8 Power Sensor
Checking bandwidth and trigger
sensitivity
9.
Generator, Time Mark
Variable marker frequency from
10 ms to 10 ns; accuracy within
2 ppm
Wavetek 9100 Calibration
System with Option 250
Checking sample rate and
delay-time accuracy
A P6109B (TDS 340A), P6111B
(TDS 360), or P6114B
(TDS 380) probe
Tektronix number
P6109B (TDS 340A), P6111B
(TDS 360), or P6114B
(TDS 380)
Signal interconnection
10. Probe, 10X,
included with this
instrument
1
The high frequency leveled sine wave generator is only required to verify the TDS 380, not the TDS 340A or TDS 360. If
you use the example equipment, refer to Sine Wave Generator Leveling Procedure on page B–14 for information on
obtaining a leveled output from an unleveled sine wave generator. If available, you can use a Tektronix SG504 Leveled
Sine Wave Generatior in place of the example equipment.
TDS 340A, TDS 360 & TDS 380 User Manual
B–3
Appendix B: Performance Verification
Test Record
Photocopy this page and use it to record the performance test results for your
instrument.
TDS 340A, TDS 360, and TDS 380 test record
Instrument Serial Number:
Temperature:
Date of Calibration:
Certificate Number:
RH %:
Technician:
Performance test
Minimum
Incoming
Outgoing
Maximum
200 mV
50 mV1
50 mV2
D at 50 mV
10 mV
5 mV
+97.1 V
+8.28 V
–581 mV
–881 mV
+286 mV
+54.6 mV
–982 mV
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
+98.9 V
+8.52 V
–619 mV
–919 mV
+314 mV
+65.4 mV
–998 mV
200 mV
50 mV1
50 mV2
D at 50 mV
10 mV
5 mV
+97.1 V
+8.28 V
–581 mV
–881 mV
+286 mV
+54.6 mV
–982 mV
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
+98.9 V
+8.52 V
–619 mV
–919 mV
+314 mV
+65.4 mV
–998 mV
CH1
42.5 mV
__________
__________
N/A
CH2
42.5 mV
__________
__________
N/A
–2.0 Div
__________
__________
+2.0 Div
stable trigger
stable trigger
__________
__________
__________
__________
N/A
N/A
DC Voltage Measurement Accuracy
CH1 VOLTS/DIV
CH2 VOLTS/DIV
1V
1V
Analog bandwidth
Long term sample rate and delay time accuracy
Edge trigger sensitivity, DC coupled
Main Trigger
Main Trigger – Falling
1
2
B–4
Generator set at –0.6 V.
Generator set at –0.9 V.
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
Performance Test Overview
The procedures are in three groupings: Signal Acquisition System Checks, Time
Base System Checks, and Triggering System Checks. They check all the
characteristics that appear in boldface type under Warranted Characteristics on
page A–1.
Prerequisites
The tests in this subsection comprise an extensive, valid confirmation of
performance and functionality when the following requirements are met:
H
The cabinet must be installed.
H
You must have performed and passed the procedures under Self Tests, on
page 1–5 and those under Functional Tests, on page 1–7.
H
The digitizing oscilloscope must have been operating for a warm-up period
of at least 20 minutes, and must be operating at an ambient temperature
between –10_ C and +55_ C.
Signal Acquisition System Checks
These procedures check signal acquisition system characteristics that are listed as
checked under Warranted Characteristics in the Specifications section.
Check DC Voltage
Measurement Accuracy
WARNING. Performance of this procedure requires input voltages up to 98 VDC.
Contact with live circuits could cause injury or death. Be sure to set the DC
calibration generator to 0 volts before connecting, disconnecting, and/or moving
the test hookup during the performance of this procedure.
Equipment Required: One dual-banana connector (Item 3), one DC calibration
generator (Item 6), and one precision coaxial cable (Item 2).
Time Required: Approximately 35 minutes.
Prerequisites: The oscilloscope must meet the prerequisites listed on
page B–5.
Procedure:
1. Set the output of a DC calibration generator to 0 volts.
TDS 340A, TDS 360 & TDS 380 User Manual
B–5
Appendix B: Performance Verification
2. Connect the output of a DC calibration generator through a dual-banana
connector followed by a 50 W precision coaxial cable to CH 1, as shown in
Figure B–2.
DC Calibrator
Output Sense
HI
LO
Dual banana to
BNC adapter
Coaxial cable
Figure B–2: Hookup for DC voltage measurement accuracy check
3. Press SAVE/RECALL SETUP ! Recall Factory Setup ! OK Confirm
Factory Init.
4. Press ACQUIRE ! Mode ! Average 16.
5. Press MEASURE ! Select Measurement.
6. Press the side menu button more until the menu label Mean appears in the
side menu. Press the side menu button Mean.
7. Set the vertical SCALE to one of the settings listed in Table B–2 that you
have not yet checked. (Start with the first setting listed.)
8. Press VERTICAL MENU ! Position.
9. Turn the General Purpose Knob to set the vertical position to the setting
listed in Table B–2. The baseline level moves off screen.
10. Press the main menu button Offset.
11. Use the General Purpose Knob to set vertical offset to the setting listed in
Table B–2 for the present vertical scale setting. The baseline level remains
off screen.
B–6
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
Table B–2: DC accuracy
Vertical scale
setting
Position
setting (divs)
Offset setting
Generator
setting
Accuracy limits
1V
+5
+100 V
+98 V
+97.1 V to +98.9 V
200 mV
+5
+10 V
+8.4 V
+8.28 V to +8.52 V
50 mV
–5
–1 V
–0.6 V
–581 mV to –619 mV
50 mV
–5
–1 V
–0.9 V
–881 mV to –919 mV
n at 50 mV
+286 mV to +314 mV
10 mV
–5
0V
+60 mV
+54.6 mV to +65.4 mV
5 mV
0
–1 V
–990 mV
–982 mV to –998 mV
12. Set the generator to the level and polarity indicated in Table B–2 for the
vertical scale, position, and offset settings you have made. The DC test level
should appear on screen. (If it does not return, the DC accuracy check has
failed for the present vertical scale setting of the current channel.)
13. Check that the readout for the measurement Mean readout on screen is
within the limits listed for the present vertical scale and position/offset/generator settings.
14. Repeat steps 7 through 13 until you have checked all the vertical scale
settings listed in Table B–2. Record the measurements for each of the 50 mV
settings.
15. Subtract the second 50 mV measurement from the first and compare the
result to the “D at 50 mV” limits in Table B–2.
16. Press WAVEFORM OFF; then, press CH 2.
17. Set the generator output to 0 V.
18. Move the test hookup to the CH 2 input.
19. Repeat steps 5 through 15 for channel 2.
20. Set the generator output to 0 V.
21. Disconnect the cable at the CH 2 input connector.
DC Gain Accuracy
Offset Accuracy
DC gain accuracy is verified by successful completion of the self tests and the
DC voltage measurement accuracy (in the previous procedure).
Offset accuracy is verified by successful completion of the Self Tests and the DC
voltage measurement accuracy (in the previous procedure).
TDS 340A, TDS 360 & TDS 380 User Manual
B–7
Appendix B: Performance Verification
Check Analog Bandwidth
Equipment Required: One leveled sine wave generator (Item 7 or 8), one 50 W
precision cable (Item 2), and one 50 W termination (Item 1).
Time Required: Approximately 20 minutes.
Prerequisites: See page B–5.
Procedure:
1. Connect, through a 50 W precision cable and a 50 W termination, the sine
wave output of a leveled sine wave generator to CH 1 (see Figure B–3). Set
the output of the generator to a reference frequency of 50 kHz.
NOTE. If you are verifying a TDS 380, you need a leveled sine wave generator
with a 400 MHz output frequency. Refer to Sine Wave Generator Leveling
Procedure on page B–14 for information on obtaining a leveled output from an
unleveled sine wave generator.
Leveled
Sine Wave
Generator
Output
50 W Termination
Figure B–3: Hookup for analog bandwidth check
1. Press SAVE/RECALL SETUP ! Recall Factory Setup ! OK Confirm
Factory Init.
2. Set the horizontal SCALE to 10 ms/div.
3. Press TRIGGER MENU ! Coupling ! Noise Rej.
4. Press ACQUIRE ! Mode ! Average 16.
5. Press MEASURE ! High–Low Setup ! Min–Max.
6. Press the main menu button Select Measurement. Now press the side menu
button more until the menu label Pk-Pk appears in the side menu. Press the
side menu button Pk-Pk.
7. Set the vertical SCALE to 10 mV/div.
B–8
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
8. Set the generator output so the CHx Pk-Pk readout equals 60 mV.
9. Press SET LEVEL TO 50% as necessary to trigger the display.
10. Increase the frequency of the generator output to 100 MHz (TDS 340A),
200 MHz (TDS 360), or 400 MHz (TDS 380).
11. Set the horizontal SCALE to 5 ns/div (TDS 340A), 2.5 ns/div (TDS 360), or
2.5 ns/div (TDS 380).
12. Press SET LEVEL TO 50% as necessary to trigger the display.
13. Check that the Pk-Pk readout on screen (as shown in
Figure B–4) is w42.5 mV.
First, increase the reference
frequency to the test frequency;
then decrease the horizontal
scale.
Second, read the results
from the readout of
measurement Pk-Pk.
Figure B–4: Measuring analog bandwidth
14. When finished checking, set the horizontal SCALE back to the 10 s/div
setting, and set the generator output frequency back to 50 kHz.
15. Press WAVEFORM OFF to remove Channel 1 from the display.
16. Press CH 2 and move the hookup to the CH 2 input.
17. Press TRIGGER MENU ! Source ! CH 2.
18. Repeat steps 6 through 13 for CH 2.
TDS 340A, TDS 360 & TDS 380 User Manual
B–9
Appendix B: Performance Verification
19. Disconnect the test hook up from the CH 2 input connector.
Time Base System Checks
This procedure checks those characteristics that relate to the Main and Delayed
time base system and are listed as checked under Warranted Characteristics in
the Specifications section.
Check Long-Term Sample
Rate and Delay Time
Accuracy
Equipment Required: One time-marker generator (Item 9), one precision
coaxial cable, (Item 2) and one 50 W termination (Item 1).
Time Required: Approximately 5 minutes.
Prerequisites: See page B–5.
Procedure:
1. Connect, through a 50 W precision coaxial cable and a 50 W termination, the
time-mark output of a time-marker generator to CH 1, as shown in Figure
B–5. Set the output of the generator for 10 ms markers.
Time-Mark
Generator
Output
50 W Termination
Figure B–5: Hookup for sample rate check
2. Press SAVE/RECALL SETUP ! Recall Factory Setup ! OK Confirm
Factory Init.
3. Set the vertical SCALE to 500 mV/div.
4. Press SET LEVEL TO 50%; use the vertical POSITION knob to center
the test signal on screen.
5. Set the horizontal SCALE to 1 ms/div.
6. Press HORIZONTAL MENU ! Trigger Position ! Set to 10%.
B–10
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
7. Adjust the horizontal POSITION to move the trigger T to the right and on
to the screen. Continue to position the trigger T to align it to the center
vertical graticule line.
8. Press the main menu button Time Base; then press the side menu button
Delayed Only.
9. Set the horizontal SCALE of the D (delayed) time base to 1 ms/div. Then
use the General Purpose knob to set delay time to 10 ms.
10. Set the horizontal SCALE of the D (delayed) time base to 500 ns/div.
NOTE. When you change the SEC/DIV in step 10, the delay time readout
changes to 10.00001 or 9.99999. This is normal and has no effect on the
verification
11. Check that the rising edge of the marker crosses the center horizontal
graticule line at a point within ±2.0 divisions of the graticule center.
NOTE. One division of displacement from the center graticule corresponds to
a 50 ppm time base error.
12. Disconnect the test hookup.
Delta Time Measurement
Accuracy
Delta time measurement accuracy is verified by successful completion of the
previous procedure.
Trigger System Checks
These procedures check those characteristics that relate to the trigger system and
are listed as checked under Warranted Characteristics in the Specifications
section.
Check Edge Trigger
Sensitivity, DC Coupled
Equipment Required: One leveled sine wave generator (Item 7 or 8), two
precision 50 W coaxial cables (Item 2), one 50 W termination (Item 1), and one
BNC T connector (Item 4).
Time Required: Approximately 10 minutes.
Prerequisites: See page B–5.
TDS 340A, TDS 360 & TDS 380 User Manual
B–11
Appendix B: Performance Verification
Procedure:
1. Press SAVE/RECALL SETUP ! Recall Factory Setup ! OK Confirm
Factory Init.
2. Set the vertical SCALE to 500 mV/div.
3. Set the horizontal SCALE to 10 ns/div.
4. Press TRIGGER MENU ! Mode ! Normal.
5. Press ACQUIRE ! Mode ! Average 16.
6. Connect one 50 W cable to the output of the sine wave generator. Attach a
BNC T connector to the other end of the cable. Connect a second 50 W cable
to the other side of the BNC T connector.
7. Connect the BNC T connector to CH 1; connect the cable to the EXT TRIG
input through a 50 W termination as shown in Figure B–6.
Leveled
Sine Wave
Generator
Output
To Ext Trigger
50 W
Termination
Figure B–6: Hookup for trigger sensitivity check
8. Set the generator frequency to 100 MHz (TDS 340A), 200 MHz (TDS 360),
or 400 MHz (TDS 380).
9. Press MEASURE ! High-Low Setup ! Min-Max.
10. Press the main menu button Select Measurement.
11. Press the side menu button –more– until Amplitude appears in the side
menu. Press the side menu button Amplitude.
12. Press SET LEVEL TO 50%.
13. Set the test signal amplitude for about one division on screen. Fine adjust the
generator output until the CH 1 Amplitude readout indicates the amplitude
is 500 mV. (Readout may fluctuate around 500 mV.)
14. Press TRIGGER MENU ! Slope.
B–12
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
15. Press SET LEVEL TO 50%. Check that a stable trigger is obtained for the
test waveform on both the positive and negative slopes (see Figure B–7).
(Use the side menu to switch between trigger slopes; use the trigger LEVEL
knob to stabilize the trigger if required.)
First, set a signal with an
amplitude at the minimum trigger
sensitivity.
Second, check for a stable
trigger at both the positive and
negative slope settings.
Figure B–7: Measuring trigger sensitivity
16. Press WAVEFORM OFF.
17. Press CH 2.
18. Press TRIGGER MENU ! Source ! Ch2.
19. Disconnect the hookup from CH 1 and connect it to CH 2.
20. Set the vertical SCALE to 500 mV/div.
21. Repeat steps 14 and 15 for Channel 2.
22. Press TRIGGER MENU ! Source ! EXT/10.
23. Press MEASURE ! Select Measrmnt ! Amplitude.
24. Increase the generator amplitude until the amplitude measurement reads
1.5 V if you are checking a TDS 340A or TDS 360. Increase the generator
amplitude until the amplitude measurement reads 4.0 V if you are checking a
TDS 380.
TDS 340A, TDS 360 & TDS 380 User Manual
B–13
Appendix B: Performance Verification
25. Repeat steps 14 and 15 for the external trigger.
26. Disconnect the test hookup.
Trigger Level Accuracy,
DC Coupled
Trigger level accuracy is verified by the successful completion of the Self Tests
and the DC voltage measurement accuracy procedure on page B–5.
This completes the performance verification procedure.
Sine Wave Generator Leveling Procedure
Some procedures in this manual require a sine wave generator to produce the
necessary test signals. If you do not have a leveled sine wave generator, use the
following procedure to level the output amplitude of your sine wave generator
using a power meter.
Equipment Required: Sine wave generator, level meter and power sensor,
power splitter, and one precision coaxial cable.
Time Required: About 5 minutes.
Prerequisites: See page B–5.
Procedure:
1. Connect the equipment as shown in Figure B–8.
2. Set the sine wave generator to a reference frequency of 50 kHz.
3. Adjust the sine wave generator amplitude to the required number of
divisions as measured by the oscilloscope.
4. Note the reading on the level meter.
5. Change the sine wave generator to the desired new frequency.
6. Input the correction factor for the new frequency into the level meter.
7. Adjust the sine wave generator amplitude until the level meter again reads
the value noted in step 4. The signal amplitude is now correctly set for the
new frequency.
B–14
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix B: Performance Verification
Sine wave
generator
Level
meter
Digitizing oscilloscope
Input
Output
Power splitter
Attenuators
(if necessary)
Power sensor
Figure B–8: Hookup for sine wave generator leveling
TDS 340A, TDS 360 & TDS 380 User Manual
B–15
Appendix B: Performance Verification
B–16
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix C: Options and Accessories
This appendix describes the various options as well as the standard and optional
accessories that are available for the TDS 340A, TDS 340A, and TDS 380.
Options
Options include the following.
Option 14: I/O Interfaces
This option includes GPIB, RS-232, and Centronics interfaces, VGA video
output, and power for the DPU 411 printer. It also includes the TDS 340A,
TDS 360 & TDS 380 Programmer Manual.
You can connect a remote display to the VGA 9-pin D connector on the rear
panel. Table C–6 on page C–4 gives the part number of a properly shielded
cable that is commercially available.
Because display manufacturers use different pin combinations and connectors,
you may find the information in Table C–1 helpful.
Table C–1: VGA output connector pins
Options A1–A5:
International Power Cords
Pin
Signal
2
Video (monochrome analog)
4
Horizontal sync @ 31.5 kHz (VGA rate)
5
Vertical sync
6, 7, 8
Ground
Besides the standard North American, 110 V, 60 Hz power cord, Tektronix ships
any of five alternate power cord configurations with the oscilloscope when
ordered by the customer (see Table C–2).
Table C–2: International power cords
Option
Power Cord
A1
Universal European — 220 V, 50 Hz
A2
UK — 240 V, 50 Hz
A3
Australian — 240 V, 50 Hz
TDS 340A, TDS 360 & TDS 380 User Manual
C–1
Appendix C: Options and Accessories
Table C–2: International power cords (Cont.)
Language Options
Option
Power Cord
A4
North American — 240 V, 60 Hz
A5
Switzerland — 220 V, 50 Hz
Language options provide user documentation in following local languages (see
Table C–3 for options and manual part numbers):
Table C–3: Language options
Warranty-Plus Service
Options
C–2
Language option
Language
User manual
Reference
Std
English
070-9459-XX
070-9434-XX
L1
French
070-9431-XX
L3
German
070-9432-XX
L4
Spanish
070-9433-XX
L5
Japanese
070-9440-XX
L7
Simple Chinese
070-9437-XX
L8
Standard Chinese
070-9438-XX
L9
Korean
070-9439-XX
070-9441-XX
The following options add to the services available with the standard warranty.
(The standard warranty appears immediately following the title page in this
manual.)
H
Option M2: Tektronix provides three years of warranty plus two years
remedial service.
H
Option M3: Tektronix provides three years of warranty plus two years
remedial service and four oscilloscope calibrations.
H
Option M8: Tektronix provides four calibrations and four performance
verifications, one of each in the second through the fifth years of service.
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix C: Options and Accessories
Standard Accessories
The standard accessories listed in Table C–4 come with the TDS 340A,
TDS 360, and TDS 380. (Refer to Table C–3 for manual part numbers.)
Table C–4: Standard accessories
Accessory
Reference
User Manual
U.S. Power Cord
Probes (quantity two) P6109B 10X Passive (TDS 340A)
Probes (quantity two) P6111B 10X Passive (TDS 360)
Probes (quantity two) P6114B 10X Passive (TDS 380)
Optional Accessories
You can order the optional accessories listed in Table C–5.
Table C–5: Optional accessories
Accessory
Part number
Scope Camera
C-9, Option 4, (includes Adapter
Hood 016-1154-01)
Oscilloscope Cart
K212
Rackmount Kit (for field conversion)
016-1166-00
Soft-Sided Carrying Case
016-1158-01
Carrying Case
016-0792-01
Deluxe Transit Case
016-1157-00
Front Cover
200-3232-02
Accessories Pouch
016-1159-00
I/O Interface Field Upgrade Kit
TD3F14A
Docuwave waveform capture utility software for the PC
S60 DWAV
Printer, bubble-jet, 360 dpi, 83 cps, plain paper
HC 220
Printer, portable thermal, 112 mm paper
DPU 411
Paper for DPU 411 printer, package of five rolls
006-7580-00
Programmer Manual
070-9442-XX
Service Manual
070-9435-XX
TDS 340A, TDS 360 & TDS 380 User Manual
C–3
Appendix C: Options and Accessories
Accessory Probes
These are other types of probes you can use with the TDS 340A, TDS 360, and
TDS 380. You can order the following probes separately:
H
P6101B 1X Passive Probe
H
P6129B Switchable 1X–10X Passive Probe (not recommended for the
TDS 360 or TDS 380)
H
P6408 TTL Logic Probe
H
P5100 High Voltage Probe
H
P5200 High-Voltage Differential Probe
H
AM503S DC/AC Current Probe System
H
P6561AS SMD Small-Geometry Probe
Accessory Cables
Table C–6 lists cables you can use with the TDS 340A, TDS 360, and TDS 380.
You can order them separately.
Table C–6: Accessory cables
C–4
Cable type
Part number
GPIB,1 meter (3.3 feet)
012-0991-01
GPIB, 2 meter (6.6 feet)
012-0991-00
RS-232, 9-pin female to 9-pin female connectors, null
modem, 76 inch (for AT style computers)
012-1379-00
RS-232, 9-pin female to 25-pin female connectors, null
modem, 76 inch (for PC style computers)
012-1380-00
RS-232, 9-pin female to 25-pin male connectors, null
modem, 9 feet (for serial interface printers)
012-1298-00
RS-232, 9-pin female to 25-pin male connectors, 15 feet
(for modems)
012-1241-00
Centronics, 25-pin male to 36-pin Centronics,
2.4 meter (8 feet) (for parallel printer interfaces)
012-1214-00
NECR VGA video cable. (Use an appropriate adapter
when other than a 9-pin monitor connection is needed.)
73893029
TDS 340A, TDS 360 & TDS 380 User Manual
Appendix D: General Care and Cleaning
General Care
Protect the oscilloscope from adverse weather conditions. The oscilloscope is not
waterproof.
CAUTION. To avoid damage to the oscilloscope, do not expose it to sprays,
liquids, or solvents.
Cleaning
Inspect the oscilloscope as often as operating conditions require. To clean the
oscilloscope exterior, perform the following steps:
1. Remove loose dust on the outside of the oscilloscope with a lint-free cloth.
Use care to avoid scratching the clear plastic display filter.
2. Use a soft cloth or paper towel dampened with water to clean the oscilloscope. You can use a 75% isopropyl alcohol solution for more efficient
cleaning.
CAUTION. To avoid damage to the surface of the oscilloscope, do not use any
abrasive or chemical cleaning agents.
TDS 340A, TDS 360 & TDS 380 User Manual
D–1
Appendix D: General Care and Cleaning
D–2
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary
Glossary
AC Coupling
A mode that blocks the DC component of a signal but passes the dynamic
(AC) component of the signal. Useful for observing an AC signal that is
normally riding on a DC signal.
Acquisition
The process of sampling signals from input channels, digitizing the samples,
processing the results into data points and assembling the data points into a
waveform record. The waveform record is stored in memory.
Active Cursor
The cursor that moves when you turn the General Purpose Knob. The @
readout on the display shows the position of the active cursor.
Aliasing
A false representation of a signal due to insufficient sampling of high
frequencies or fast transitions. A condition that occurs when an oscilloscope
digitizes at an effective sampling rate that is too slow to reproduce the input
signal. The waveform displayed on the oscilloscope may have a lower
frequency than the actual input signal.
Attenuation
The degree the amplitude of a signal is reduced when it passes through an
attenuating device such as a probe or attenuator, that is, the ratio of the input
measure to the output measure. For example, a 10X probe attenuates, or
reduces, the input voltage of a signal by a factor of 10.
Auto Trigger Mode
A trigger mode that causes the oscilloscope to automatically acquire if it
does not detect a triggerable event.
Autoset
A function of the oscilloscope that automatically produces a stable waveform
of usable size. Autoset sets up front-panel controls based on the characteristics of the active waveform. A successful autoset sets the volts per division,
time per division, and trigger level to produce a coherent and stable
waveform display.
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary–1
Glossary
Average Acquisition Mode
In this mode the oscilloscope acquires and displays a waveform that is the
averaged result of several acquisitions. This reduces the apparent noise. The
oscilloscope acquires data as in the sample mode and then averages it
according to a specified number of averages.
Cursors
Paired markers that you can use to make measurements between two
waveform locations. The oscilloscope displays the values (expressed in volts
or time) of the position of the active cursor and the distance between the two
cursors.
DC Coupling
A mode that passes both AC and DC signal components to the circuit.
Available for both the trigger system and the vertical system.
Digital Real-Time Digitizing
A digitizing technique that samples the input signal with a sample frequency
of four to five times the oscilloscope bandwidth. Combined with (sinx)/x
interpolation, all frequency components of the input up to the bandwidth are
accurately displayed.
Digitizing
The process of converting a continuous analog signal such as a waveform to
a set of discrete numbers representing the amplitude of the signal at specific
points in time.
Edge Trigger
Triggering occurs when the oscilloscope detects the source passing through a
specified voltage level in a specified direction (the trigger slope).
Envelope Acquisition Mode
A mode in which the oscilloscope acquires and displays a waveform that
shows the variation extremes of several acquisitions.
Fast Fourier Transform (FFT)
An algorithm used to transform a time-domain waveform into a frequencydomain waveform. The frequency-domain waveform shows the spectral
content of the time-domain waveform.
Gated Measurements
A feature that lets you limit automated measurements to a specified portion
of the waveform. You define the area of interest using the vertical cursors.
GPIB (General Purpose Interface Bus)
An interconnection bus and protocol that allows you to connect multiple
instruments in a network under the control of a controller. Also known as
IEEE 488 bus. It transfers data with eight parallel data lines, five control
lines, and three handshake lines.
Glossary–2
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary
Ground (GND) Coupling
Coupling option that disconnects the input signal from the vertical system.
Hard Copy
An electronic copy of the display in a format useable by a printer or plotter.
Holdoff, Trigger
A specified amount of time after a trigger signal that elapses before the
trigger circuit will accept another trigger signal. This helps ensure a stable
display.
Horizontal Bar Cursors
The two horizontal bars that you position to measure the voltage parameters
of a waveform. The oscilloscope displays the value of the active (moveable)
cursor with respect to ground and the voltage value between the bars.
Main Menu
A group of related controls for a major oscilloscope function that the
oscilloscope displays across the bottom of the screen.
Main Menu Buttons
Bezel buttons under the main menu display. They allow you to select items
in the main menu.
Normal Trigger Mode
A mode on which the oscilloscope does not acquire a waveform record
unless a valid trigger event occurs. It waits for a valid trigger event before
acquiring waveform data.
Pixel
A visible point on the display. The oscilloscope display is 640 pixels wide
by 480 pixels high.
Pop-Up Menu
A submenu of a main menu. Pop-up menus temporarily occupy part of the
waveform display area and present additional choices associated with the
main menu selection. You can cycle through the options in a pop-up menu
by repeatedly pressing the main menu button underneath the pop-up.
Pretrigger
The specified portion of the waveform record that contains data acquired
before the trigger event.
Record Length
The specified number of samples in a waveform.
Reference Memory
Memory in an oscilloscope used to store waveforms or settings. You can use
that waveform data later for processing. The oscilloscope saves the data even
if you turn it off or unplug it.
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary–3
Glossary
Roll
An acquisition mode useful at slow horizontal scale settings. Roll mode
allows you to view the waveform as it is acquired point-by-point. The
waveform appears to roll across the display.
Sample Acquisition Mode
The oscilloscope creates a record point by saving the first sample during
each acquisition interval. This is the default mode of the acquisition system.
Sample Interval
The time interval between successive samples in a time base. For real-time
digitizers, the sample interval is the reciprocal of the sample rate.
Sampling
The process of capturing an analog input, such as a voltage, at a discrete
point in time and holding it constant so that it can be quantized.
Selected Waveform
The waveform on which all measurements are performed and which is
affected by vertical position and scale adjustments.
Side Menu
Menu that appears to the right of the display. These selections expand on
main menu selections.
Side Menu Buttons
Bezel buttons to the right of the side menu display. They allow you to select
items in the side menu.
Signal Path Compensation (SPC)
The ability of the oscilloscope to minimize the electrical offsets in the
vertical, horizontal, and trigger amplifiers caused by ambient temperature
changes and component aging. You should run SPC at the following times:
when the ambient temperature varies more than 5_ C from the last SPC,
when using settings equal to or less than 5 mV per division, and when
performing critical measurements.
Tek Secure
This feature erases all waveform and setup memory locations (setup
memories are replaced with the factory setup). Then it checks each location
to verify erasure. This feature is useful where the oscilloscope is used to
gather security sensitive data.
Time base
The set of parameters that let you define the time and horizontal axis
attributes of a waveform record. The time base determines when and how
long to acquire record points.
Vertical Bar Cursors
The two vertical bars you position to measure the time parameter of a
Glossary–4
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary
waveform record. The oscilloscope displays the value of the active (moveable) cursor with respect to trigger and the time value between the bars.
Video Trigger
Triggering on the sync pulse of a composite video signal.
XY Format
A display format that compares the voltage level of two waveform records
point by point. It is useful for studying phase relationships between two
waveforms.
YT Format
The conventional oscilloscope display format. It shows the voltage of a
waveform record (on the vertical axis) as it varies over time (on the
horizontal axis).
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary–5
Glossary
Glossary–6
TDS 340A, TDS 360 & TDS 380 User Manual
Index
Index
A
B
Aborting a hard copy, 3–41
AC input coupling, 3–4
AC trigger coupling, 3–12
AC trigger source, 3–12
Accessories
cables, C–4
optional, C–3–C–4
pouch, C–3
probes, C–4
standard, C–3–C–4
ACQUIRE button, 2–5, 3–25
Acquire menu, 3–25
Acquisition, 3–25
autoset default, 2–15
average mode, 3–26
defined, Glossary–1
envelope mode, 3–26
mode, 3–26
nominal specifications, A–7
peak detect mode, 3–26
performance verification, B–5
sample mode, 3–26
single sequence mode, 3–26
typical specifications, A–5
warranted specifications, A–1
Active cursor, Glossary–1
Air intake space, 1–2
Aliasing, 3–37, Glossary–1
Amplitude measurement, 3–20
Analog bandwidth, 1–1
Applications, FFT math waveforms, 3–31
Attenuation, Glossary–1
Auto trigger mode, 3–13, Glossary–1
Automated measurements, 1–1, 3–17
of FFT math waveforms, 3–35
Autoset, 1–1, 2–15, Glossary–1
defaults, 2–15
AUTOSET button, 2–5, 2–15
Average acquisition mode, 3–26, Glossary–2
Bandwidth
analog, 1–1
autoset default, 2–16
selecting, 3–5
Burst width measurement, 3–19
TDS 340A, TDS 360 & TDS 380 User Manual
C
Cables, C–4
Cal menu, 3–59
Calibration test record, B–4
Camera, C–3
Carrying case, C–3
soft sided, C–3
Centronics interface, 2–8, 3–42
cables, C–4
CH 1, 2–2
CH 1 input, 2–7
CH 2, 2–2
CH 2 input, 2–7
Channel ground indicator, 2–6
CLEAR MENU button, 2–1
Clipping, FFT math waveforms, 3–37
Compensating a probe, 2–12
Compensation, output, 2–2
Config menu, 3–59
Connecting a probe, 2–12
Connector, chassis ground, 2–2
Contrast, 3–28
Controls
display, 2–1
horizontal system, 2–3
power, 2–1
trigger, 2–4
vertical system, 2–2
Conventions, performance verification, B–1–B–16
Cooling space, 1–2
Index–1
Index
Coupling
AC, 3–4, Glossary–1
DC, 3–4
ground, 3–4, Glossary–3
input, 3–4
trigger, 3–12
AC, 3–12
DC, 3–12
HF reject, 3–12
LF reject, 3–13
noise reject, 3–13
Current probe, C–4
CURSOR button, 2–5, 3–21
Cursor menu, 3–34
Cursor readout
H-Bars, 3–34
Paired cursors, 3–35
V-Bars, 3–34
Cursors, 1–1, 3–21, Glossary–2
menu, 3–22
paired, 3–22
readouts, 2–6
vertical bar indicators, 2–6
with FFT waveforms, 3–34
Cycle mean, measurement, 3–20
Cycle RMS, measurement, 3–20
Display
contrast, 3–28
controls, 2–1, 3–27
dot accumulate, 3–28
dots, 3–28
format, 3–28
autoset default, 2–15
intensity, 3–28
autoset default, 2–15
text and graticule, 3–28
waveform, 3–28
map, 2–6
menu, 3–27
menu locations, B–2
nominal specifications, A–9
persistence, 3–28
style, 3–28
autoset default, 2–15
vector accumulate, 3–28
vectors, 3–28
DISPLAY button, 2–5, 3–27
Dot accumulate, 3–28
Dot display, 3–28
Duty cycle, measurement, 3–19
D
ECL switching threshold, 3–13
Edge trigger, Glossary–2
Envelope acquisition mode, 3–26, Glossary–2
Environmental, safety, and reliability, warranted
specifications, A–4
Equipment list, for performance verification,
B–3–B–16
EXT TRIG input, 2–7, 3–12
External triggering, 3–12
Data handling, typical specifications, A–7
Date/Time stamp
displaying, 3–29
setting, 3–60
DC coupling, Glossary–2
input, 3–4
trigger, 3–12
DC offset, 3–37
for DC correction of FFTs, 3–37
with math waveforms, 3–37
Deluxe transit case, C–3
Diag menu, 3–59
Digitizing, Glossary–2
Dimensional drawing, A–11
Disk drive, 3–55–3–58
See also File system
Index–2
E
TDS 340A, TDS 360 & TDS 380 User Manual
Index
F
Factory setup, 3–52
Fall time measurement, 3–19
Fast Fourier Transforms (FFTs), applications, 3–31
FFT, definition, Glossary–2
FFT frequency domain record, 3–36
FFT math waveform, 3–31
aliasing, 3–37
automated measurements of, 3–35
DC correction, 3–37
derivation of, 3–31
frequency range, 3–36
frequency resolution, 3–36
procedure for displaying, 3–32
procedure for measuring, 3–34
record length, 3–36
undersampling, 3–37
window, 3–38
File system, 3–55–3–58
confirm delete, 3–58
copying a file, 3–57
creating a directory, 3–57
deleting a file, 3–56
formatting a disk, 3–58
override lock, 3–58
printing a file, 3–57
renaming a file, 3–56
Fit to screen, 3–7
FORCE TRIGGER button, 2–4
Frame graticule, 3–28
Frequency measurement, 3–19
Front panel
cover, C–3
inputs, 2–7
setups, saving and recalling, 3–51
Full graticule, 3–28
Fuse, 1–2
drawer, 2–8
removal and replacement, 1–3–1–4
specifications, 1–2
G
Gated measurements, Glossary–2
Gating, 3–20
General Purpose Knob, 2–5, 2–11, 3–5, 3–7, 3–13,
3–20, 3–21, 3–23, 3–26, 3–28
icon, 2–6
readout, 2–6
TDS 340A, TDS 360 & TDS 380 User Manual
GPIB interface, 3–42, Glossary–2
cables, C–4
port, 2–8
talk only, 3–43
Graphical user interface, 1–1, 2–9
Graticule, full or frame, 3–28
Graticule intensity, 3–28
Ground coupling, 3–4, Glossary–3
H
H Bars, 3–22
Hanning window, 3–38
Hard copy, 3–41, Glossary–3
abort, 3–41
configuring output, 3–41
format, 3–42
layout, 3–42
output ports, 2–8
port, 3–42
saving to disk, 3–43
HARDCOPY button, 2–5, 3–41
HF reject trigger coupling, 3–12
High frequency reject, 3–12
High measurement, 3–19
High Ref, 3–19, 3–21
High voltage probe, C–4
High-low setup, 3–21
Histogram, 3–21
Holdoff, Glossary–3
adjustment, 3–13
autoset default, 2–16
range, 3–13
Horizontal bar cursors, Glossary–3
HORIZONTAL MENU button, 2–3, 3–6
Horizontal position lock, reference waveforms, 3–46
Horizontal system, 3–6
controls, 2–3
menu, 3–6
menu button, 2–3
position, autoset default, 2–15
POSITION knob, 2–3
scale, autoset default, 2–15
scale control, 2–3
scale readout, 2–6
Index–3
Index
I
I/O interface field upgrade kit, C–3
Input channels, 1–1
Input coupling, 3–4
Inputs
CH 1 and CH 2, 2–7
EXT TRIG, 2–7
Installation, 1–2
Instruction manual, xi
Intensity, 3–28
autoset default, 2–15
text and graticule, 3–28
waveform, 3–28
Interfaces
Centronics, 2–8
GPIB, 2–8
nominal specifications, A–9
RS-232, 2–8
user, 2–9
Inverting a waveform, 3–4
L
Landscape output, 3–42
LEVEL knob, 2–4
LF reject trigger coupling, 3–13
Line cord removal, 1–3–1–4
Logic probe, C–4
Low frequency reject, 3–13
Low measurement, 3–19
Low Ref, 3–19, 3–21
M
Main menu, 2–6, 2–10, Glossary–3
buttons, 2–1, 2–11, Glossary–3
MATH button, 2–2, 3–8
Math waveform, 3–8
FFT. See FFT math waveform
menu, 3–3, 3–9
Maximum measurement, 3–19
Mean measurement, 3–20
MEASURE button, 2–5, 3–17
Measure menu, 3–18
Measurement definitions, 3–19
Index–4
Measurements, 3–17
amplitude, 3–20
automated, 1–1, 3–17
activating, 3–18
burst width, 3–19
cycle mean, 3–20
cycle RMS, 3–20
fall time, 3–19
frequency, 3–19
gated, Glossary–2
high, 3–19
low, 3–19
maximum, 3–19
mean, 3–20
minimum, 3–19
negative duty cycle, 3–19
negative overshoot, 3–19
negative width, 3–19
peak to peak, 3–19
period, 3–19
positive duty cycle, 3–19
positive overshoot, 3–19
positive width, 3–19
removing, 3–20
rise time, 3–19
RMS, 3–20
Mechanical characteristics, nominal specifications,
A–10
Menu locations, B–2
Menus
acquisition, 3–25
cal, 3–59
config, 3–59
cursor, 3–22
diagnostics, 3–59
display, 3–27
edge trigger, 3–12
horizontal system, 2–3, 3–6
math, 3–3, 3–9
measure, 3–18
pop-up, Glossary–3
reference waveform, 3–3, 3–46
save/recall setup, 3–51
system I/O, 3–59
trigger, 2–4
utility, 3–59
vertical system, 3–3, 3–4
video trigger, 3–14, 3–15
Mid Ref, 3–19, 3–21
Min-max, 3–21
Minimum measurement, 3–19
TDS 340A, TDS 360 & TDS 380 User Manual
Index
N
Negative duty cycle measurement, 3–19
Negative overshoot measurement, 3–19
Negative width measurement, 3–19
Noise reject trigger coupling, 3–13
Nominal specifications, A–7
Normal trigger mode, 3–13, Glossary–3
NTSC standard video signal, 3–14
Nyquist frequency, 3–37
O
Offset, 3–5
autoset default, 2–16
vertical, 3–37
ON/STBY button, 1–2, 2–1
Option 14, 2–8, 3–59, C–1
Optional accessories, C–3
Options, C–1
I/O interfaces, C–1
power cords, C–1
warranty-plus service, C–2
Options and accessories, C–1
Oscilloscope cart, C–3
P
Paired cursors, 3–22
PAL standard video signal, 3–14
Peak Detect mode, 3–26
Peak to peak measurement, 3–19
Performance tests, A–1
Performance verification
equipment required, B–3
functional test, 1–7–1–10
general instructions, B–1–B–16
of warranted characteristics, B–5–B–16
partial vs. complete. See Performance Verification,
General Instructions
prerequisites, B–5–B–16
purpose and extent of. See Performance Verification,
General Instructions
self tests, 1–5–1–6
test record, B–4
trigger checks, B–11
Period measurement, 3–19
Pixel, Glossary–3
Pop-up menu, 2–11, Glossary–3
Portrait output, 3–42
Position, vertical, 3–37
TDS 340A, TDS 360 & TDS 380 User Manual
POSITION knob
horizontal, 2–3
vertical, 2–2
Positive duty cycle measurement, 3–19
Positive overshoot measurement, 3–19
Positive width measurement, 3–19
Power
connector, 1–2, 2–8
controls, 2–1
cord, 1–2
clamp, 1–2
option, C–1
removal, 1–3–1–4
distribution system, nominal specifications, A–9
on, 1–2–1–4
requirements, warranted, A–3
Pretrigger, Glossary–3
PROBE COMP output, 2–12
Probe compensation
output, 2–2
typical specifications, A–6
waveform, 2–13
Probes, 2–12, C–3
accessory, C–4
compensating, 2–12
connecting, 2–12
current, C–4
high voltage, C–4
logic, C–4
specifications, 2–12
Product description, 1–1
Programmer manual, xi, 2–8, 3–59, C–1
Programming
via GPIB, 2–8
via RS-232, 2–8
R
Rackmount kit, C–3
Readout, cursor
H-Bars, 3–34
Paired cursors, 3–35
V-Bars, 3–34
Readouts, 1–1
cursor, 2–6
general purpose knob, 2–6
horizontal scale, 2–6
status, 2–6
trigger, 2–6
trigger position (horizontal), 2–6
vertical scale, 2–6
READY indicator, 2–4
Index–5
Index
Rear panel, 2–8
label, 1–2
power connector, 1–2, 2–8
Recalling
front panel setups, 3–51
the factory setup, 3–52
waveforms, 3–47
Record length, 1–1, Glossary–3
REF 1, 2–2
button, 3–45
REF 2, 2–2
button, 3–45
Reference, xi
levels, 3–21
memory, Glossary–3
section, 3–1
waveform menu, 3–3, 3–46
waveforms, 3–45
horizontal lock, 3–46
removing from the display, 3–47
Related manuals, xi
Remote control
GPIB port, 2–8
RS-232 port, 2–8
Removing a measurement, 3–20
Resolution, vertical, 1–1
Rise time measurement, 3–19
RMS measurement, 3–20
Roll, acquisition mode, 3–13, Glossary–4
RS-232 port, 2–8
RUN/STOP button, 2–5, 3–26
S
Sample
acquisition mode, Glossary–4
interval, Glossary–4
mode, 3–26
rate, 1–1
Sampling, Glossary–4
Save format, 3–47
SAVE/RECALL SETUP button, 2–5, 3–51
Save/recall setup menu, 3–51
Saving front panel setups, 3–51
Saving waveforms, 3–45
Index–6
Scale, vertical, 3–37
SCALE knob
horizontal, 2–3
vertical, 2–2
Scope camera, C–3
Seconds per division, fastest setting, 1–1
SELECT button, 2–5, 3–20, 3–23
Selected waveform, Glossary–4
Service options, C–2
SET LEVEL TO 50% button, 2–4, 3–13
Side menu, 2–6, Glossary–4
buttons, 2–1, Glossary–4
Signal path, compensation, Glossary–4
Single sequence mode, 3–26
SPC, Glossary–4
Specifications, A–1
Standard accessories, C–3
Start up, 1–2
Status readouts, 2–6
System I/O, 3–42
System I/O menu, 3–59
T
Tek Secure, 3–52, 3–59, Glossary–4
TekSecure, 3–45
Test record, B–4
Text intensity, 3–28
Time base, 3–7, Glossary–4
delayed, 3–7
delayed runs after main, 3–7
fastest setting, 1–1
intensified zone, 3–7
main, 3–7
nominal specifications, A–8
performance verification, B–10
readout, 2–6
warranted specifications, A–2
Time base setting, autoset default, 2–15
Time/Date stamp
displaying, 3–29
setting, 3–60
Transit case, C–3
TRIG’D indicator, 2–4
TDS 340A, TDS 360 & TDS 380 User Manual
Index
Trigger
controls, 2–4
coupling
AC, 3–12
autoset default, 2–15
DC, 3–12
HF reject, 3–12
LF Reject, 3–13
noise reject, 3–13
edge, 3–11, Glossary–2
edge menu, 3–12
external, 3–12
holdoff
adjustment, 3–13
autoset default, 2–16
range, 3–13
horizontal position adjustment, 3–7
horizontal position readout, 2–6
level
adjustment, 3–13
autoset default, 2–15
indicator, 2–6
set to 50%, 3–13
LEVEL knob, 3–13
mode, 3–13
normal, 3–13
roll, 3–13
nominal specifications, A–8
point indicator, 2–6
position, autoset default, 2–15
readout, 2–6
slope, 3–13
autoset default, 2–15
source, 3–12
AC, 3–12
autoset default, 2–15
T, 3–28
type, autoset default, 2–15
typical specifications, A–6
video, 3–11, 3–14
menu, 3–14, 3–15
point adjustment, 3–14
source, mode, and holdoff, 3–14
warranted specifications, A–3
TDS 340A, TDS 360 & TDS 380 User Manual
TRIGGER MENU button, 2–4, 3–11
Triggering, 3–11
edge, 3–11
external, 3–12
on the ECL switching threshold, 3–13
on the TTL switching threshold, 3–13
video, 3–14
TTL switching threshold, 3–13
Typical specifications, A–5
U
User interface, 2–9
UTILITY button, 2–5, 3–41
Utility menu, 3–59
V
V Bars, 3–22
Vector
accumulate, 3–28
display, 3–28
Vertical bar
cursors, Glossary–4
indicators, 2–6
VERTICAL MENU button, 2–2, 3–3
Vertical position, for DC correction of FFTs, 3–37
Vertical resolution, 1–1
Vertical scale readout, 2–6
Vertical system, 3–3
controls, 2–2
coupling, autoset default, 2–16
fine scale adjustments, 3–5
menu, 3–4
menu button, 2–2
offset, autoset default, 2–16
offset adjustment, 3–5
position adjustments, 3–5
POSITION control, 2–2
scale, autoset default, 2–16
scale control, 2–2
VGA display, C–1
Video trigger, 3–14
source, mode, and holdoff, 3–14
trigger point adjustment, 3–14
Index–7
Index
W
Warranted specifications, A–1
performance conditions for, A–1
Warranty-plus service options, C–2
WAVEFORM OFF button, 2–2, 3–18, 3–47
Waveform Rate, A–8
Waveform record, FFT, 3–36
Waveform record icon, 2–6
Waveforms
intensity, 3–28
inverting, 3–4
math, 3–8
recalling from disk, 3–48
recalling reference waveforms, 3–47
reference, 3–45
horizontal lock, 3–46
saving to a reference waveform, 3–45
saving to disk, 3–48
selecting, 2–2
Index–8
Width measurement, 3–19
Window, Hanning, 3–38
X
XY
format, Glossary–5
mode, 3–28
XYZs of Analog and Digital Oscilloscopes, xi
Y
YT
format, Glossary–5
mode, 3–28
TDS 340A, TDS 360 & TDS 380 User Manual