Tektronix TDS 694C User manual

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User Manual
TDS 694C
Digital Real-Time Oscilloscope
071-0473-00
This document supports firmware version 1.0 and
above.

Copyright ©Tektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and
are protected by United States copyright laws and international treaty provisions.
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the
Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the
Commercial Computer Software – Restricted Rights clause at FAR 52.227-19, as applicable.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years
from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either
will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the
defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time or
difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

TDS 694C User Manual i
Table of Contents
General Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Manuals xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 694C Features 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Specification 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Up 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Putting into Service 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Overview 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Interface Maps 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tutorial 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example 1: Displaying a Waveform 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example 2: Displaying Multiple Waveforms 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example 3: Taking Automated Measurements 2–20. . . . . . . . . . . . . . . . . . . . . . . . . .
Example 4: Saving Setups 2–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Overview 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquiring and Displaying Waveforms 3–5. . . . . . . . . . . . . . . . . . . . . . . . .
Coupling Waveforms to the Oscilloscope 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting up Automatically: Autoset and Reset 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Channels 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scaling and Positioning Waveforms 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Choosing an Acquisition Mode 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customizing the Display 3–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customizing the Display Color 3–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zooming on Waveforms 3–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering on Waveforms 3–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering Concepts 3–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering from the Front Panel 3–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering on a Waveform Edge 3–49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering Based on Logic 3–53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering on Pulses 3–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delayed Triggering 3–82. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Waveforms 3–89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taking Automated Measurements 3–90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taking Cursor Measurements 3–100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii TDS 694C User Manual
Taking Graticule Measurements 3–105. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Histograms 3–106. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optimizing Measurement Accuracy: SPC and Probe Cal 3–110. . . . . . . . . . . . . . . . . .
Saving Waveforms and Setups 3–117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving and Recalling Setups 3–117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving and Recalling Waveforms and Acquisitions 3–120. . . . . . . . . . . . . . . . . . . . . .
Managing the File System 3–124. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printing a Hardcopy 3–129. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communicating with Remote Instruments 3–139. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determining Status and Accessing Help 3–143. . . . . . . . . . . . . . . . . . . . . . . .
Displaying Status 3–143. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying the Banner 3–145. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Help 3–145. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Features for Advanced Applications 3–147. . . . . . . . . . . . . . . . . . . . . .
Limit Testing 3–147. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Math 3–152. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fast Fourier Transforms 3–155. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Differentiation 3–174. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Integration 3–179. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
Appendix A: Options and Accessories A–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Algorithms B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Packaging for Shipment C–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Probe Selection D–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix E: Inspection and Cleaning E–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix F: Programmer Disk F–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index

Table of Contents
TDS 694C User Manual iii
List of Figures
Figure 1–1: Rear Panel Controls Used in Start Up 1–7. . . . . . . . . . . . . . .
Figure 1–2: ON/STBY Button 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–1: Deskew Fixture Connections
(two P6249 probes shown) 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Connecting a Probe for the Examples
(P6249 shown) 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: SETUP Button Location 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: The Setup Menu 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–5: Trigger Controls 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–6: The Display After Factory Initialization 2–13. . . . . . . . . . . . .
Figure 2–7: The VERTICAL and HORIZONTAL Controls 2–14. . . . . . .
Figure 2–8: TRIGGER Controls 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–9:AUTOSET Button Location 2–16. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–10: The Display After Pressing Autoset 2–16. . . . . . . . . . . . . . . .
Figure 2–11: The Channel Buttons and Lights 2–17. . . . . . . . . . . . . . . . . . .
Figure 2–12: The Vertical Main Menu and Coupling
Side Menu 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–13: The Menus After Changing Channels 2–20. . . . . . . . . . . . . .
Figure 2–14: Measure Main Menu and Select Measurement
Side Menu 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–15: Four Simultaneous Measurement Readouts 2–23. . . . . . . . .
Figure 2–16: General Purpose Knob Indicators 2–24. . . . . . . . . . . . . . . . .
Figure 2–17: Snapshot of Channel 1 2–26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–18: Save/Recall Setup Menu 2–27. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: The Channel Readout 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–2: Waveform Selection Priority 3–9. . . . . . . . . . . . . . . . . . . . . . .
Figure 3–3: Scaling and Positioning 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–4: Vertical Readouts and Channel Menu 3–12. . . . . . . . . . . . . . .
Figure 3–5: Record View and Time Base Readouts 3–14. . . . . . . . . . . . . . .
Figure 3–6: Horizontal Controls 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–7:Acquisition: Input Analog Signal,
Sample, and Digitize 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–8: Several Points May be Acquired for
Each Point Used 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–9: Real-Time Sampling 3–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
iv TDS 694C User Manual
Figure 3–10: How the Acquisition Modes Work 3–21. . . . . . . . . . . . . . . . .
Figure 3–11: Acquisition Menu and Readout 3–22. . . . . . . . . . . . . . . . . . . .
Figure 3–12:Acquire Menu — Stop After 3–23. . . . . . . . . . . . . . . . . . . . . .
Figure 3–13: Aliasing 3–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–14: Display Menu — Style 3–26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–15: Trigger Point and Level Indicators 3–27. . . . . . . . . . . . . . . . .
Figure 3–16: Display Menu — Setting 3–30. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–17: Display Menu — Palette Colors 3–32. . . . . . . . . . . . . . . . . . .
Figure 3–18: Display Menu — Map Reference Colors 3–33. . . . . . . . . . . .
Figure 3–19: Display Menu — Restore Colors 3–34. . . . . . . . . . . . . . . . . . .
Figure 3–20: Zoom Mode with Horizontal Lock Set to None 3–37. . . . . . .
Figure 3–21: Dual Window (Preview) Mode 3–38. . . . . . . . . . . . . . . . . . . . .
Figure 3–22: Dual Zoom — Shown Dual Window
(Preview) Mode 3–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–23: Triggered Versus Untriggered Displays 3–42. . . . . . . . . . . . .
Figure 3–24: Trigger Holdoff Time Ensures Valid Triggering 3–44. . . . . .
Figure 3–25: Slope and Level Controls Help Define the Trigger 3–45. . . .
Figure 3–26: TRIGGER Controls and Status Lights 3–46. . . . . . . . . . . . . .
Figure 3–27: Example Trigger Readouts — Edge
Trigger Selected 3–48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–28: Record View, Trigger Position, and Trigger Level Bar
Readouts 3–49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–29: Edge Trigger Readouts 3–50. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–30: Main Trigger Menu — Edge Type 3–50. . . . . . . . . . . . . . . . .
Figure 3–31: Violation Zones for Setup/Hold Triggering 3–56. . . . . . . . . .
Figure 3–32: Logic Trigger Readouts — State Class Selected 3–57. . . . . .
Figure 3–33: Logic Trigger Menu 3–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–34: Logic Trigger Menu — Time Qualified TRUE 3–60. . . . . . .
Figure 3–35: Triggering on a Setup/Hold Time Violation 3–64. . . . . . . . . .
Figure 3–36: TLA 714 to TDS 694C 3–66. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–37: TLA 720 to TDS 694C 3–66. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–38: Pulse Trigger Readouts 3–70. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–39: Main Trigger Menu — Glitch Class 3–72. . . . . . . . . . . . . . . .
Figure 3–40: Main Trigger Menu — Runt Class 3–75. . . . . . . . . . . . . . . . .
Figure 3–41: Main Trigger Menu — Slew Rate Class 3–80. . . . . . . . . . . . .
Figure 3–42: Delayed Runs After Main 3–83. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–43: Delayed Triggerable 3–83. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–44: How the Delayed Triggers Work 3–85. . . . . . . . . . . . . . . . . . .
Figure 3–45: Delayed Trigger Menu 3–87. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
TDS 694C User Manual v
Figure 3–46: Histogram, Graticule, Cursor and
Automated Measurements 3–89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–47: Measurement Readouts with Statistics 3–93. . . . . . . . . . . . . .
Figure 3–48: Measure Menu 3–94. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–49: Measure Menu — Gating 3–95. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–50: Measure Menu — Reference Levels 3–97. . . . . . . . . . . . . . . .
Figure 3–51: Measure Delay Menu — Delay To 3–98. . . . . . . . . . . . . . . . . .
Figure 3–52: Snapshot Menu and Readout 3–99. . . . . . . . . . . . . . . . . . . . . .
Figure 3–53: Cursor Types 3–101. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–54: Cursor Modes 3–102. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–55: H Bars Cursor Menu and Readouts 3–103. . . . . . . . . . . . . . . .
Figure 3–56: Paired Cursor Menu and Readouts 3–104. . . . . . . . . . . . . . . .
Figure 3–57: Histogram Menu and Vertical Histogram 3–107. . . . . . . . . . .
Figure 3–58: Performing a Signal Path Compensation 3–111. . . . . . . . . . . .
Figure 3–59: Probe Cal Menu and Gain Compensation Display 3–113. . . .
Figure 3–60: Re-use Probe Calibration Data Menu 3–115. . . . . . . . . . . . . . .
Figure 3–61: Save/Recall Setup Menu 3–118. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–62: Save Waveform Menu 3–121. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–63: More Menu 3–123. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–64: File Utilities 3–125. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–65: File System — Labeling Menu 3–126. . . . . . . . . . . . . . . . . . . . .
Figure 3–66: Utility Menu — System I/O 3–131. . . . . . . . . . . . . . . . . . . . . . .
Figure 3–67: Hardcopy Formats 3–132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–68: Date and Time Display 3–133. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–69: Connecting the Oscilloscope Directly to the
Hardcopy Device 3–134. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–70: Connecting the Oscilloscope and Hardcopy
Device Via a PC 3–137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–71: Typical GPIB Network Configuration 3–140. . . . . . . . . . . . . .
Figure 3–72: Stacking GPIB Connectors 3–140. . . . . . . . . . . . . . . . . . . . . . .
Figure 3–73: Connecting the Oscilloscope to a Controller 3–141. . . . . . . . .
Figure 3–74: Utility Menu 3–142. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–75: Status Menu — System 3–144. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–76: Banner Display 3–145. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–77: Initial Help Screen 3–146. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–78: Comparing a Waveform to a Limit Template 3–148. . . . . . . .
Figure 3–79:Acquire Menu — Create Limit Test Template 3–149. . . . . . . .
Figure 3–80: More Menu 3–153. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–81: Dual Waveform Math Main and Side Menus 3–154. . . . . . . .

Table of Contents
vi TDS 694C User Manual
Figure 3–82: System Response to an Impulse 3–157. . . . . . . . . . . . . . . . . . . .
Figure 3–83: Define FFT Waveform Menu 3–158. . . . . . . . . . . . . . . . . . . . . .
Figure 3–84: FFT Math Waveform in Math1 3–160. . . . . . . . . . . . . . . . . . . .
Figure 3–85: Cursor Measurement of an FFT Waveform 3–161. . . . . . . . . .
Figure 3–86: Waveform Record vs. FFT Time Domain Record 3–163. . . . .
Figure 3–87: FFT Time Domain Record vs. FFT Frequency
Domain Record 3–164. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–88: How Aliased Frequencies Appear in an FFT 3–168. . . . . . . . .
Figure 3–89: Windowing the FFT Time Domain Record 3–171. . . . . . . . . .
Figure 3–90: FFT Windows and Bandpass Characteristics 3–174. . . . . . . .
Figure 3–91: Derivative Math Waveform 3–176. . . . . . . . . . . . . . . . . . . . . . .
Figure 3–92: Peak-Peak Amplitude Measurement of a
Derivative Waveform 3–177. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–93: Integral Math Waveform 3–181. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–94: H Bars Cursors Measure an Integral Math
Waveform 3–182. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–1: MCross Calculations B–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–2: Fall Time B–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–3: Rise Time B–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–4: Choosing Minima or Maxima to Use for Envelope
Measurements B–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure D–1: Typical High Voltage Probes D–3. . . . . . . . . . . . . . . . . . . . . . .
Figure D–2:A6303 Current Probe Used in the
AM 503S Opt. 03 D–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure F–1: Equipment Needed to Run the Example Programs F–1. . . .

Table of Contents
TDS 694C User Manual vii
List of Tables
Table 1–1: Key Features of TDS 694C 1–3. . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Fuse and fuse cap part numbers 1–7. . . . . . . . . . . . . . . . . . . .
Table 3–1: Autoset defaults 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–2: XY Format pairs 3–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–3: Pattern and State Logic 3–54. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–4: Pulse trigger definitions 3–70. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–5: Measurement definitions 3–90. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–6: Measurement definitions 3–109. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–7: Probe cal status 3–116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–1: Options A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–2: Standard accessories A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–3: Optional accessories A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–4: Recommended probe cross reference A–3. . . . . . . . . . . . . . . .
Table A–5: Accessory software A–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table E–1: External inspection check list E–2. . . . . . . . . . . . . . . . . . . . . .

Table of Contents
viii TDS 694C User Manual

TDS 694C User Manual ix
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Use Proper Voltage Setting. Before applying power, ensure that the line selector is
in the proper position for the power source being used.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Connect the ground lead of the probe to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With SuspectedFailures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/DampConditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
To Avoid Fire or
Personal Injury

General Safety Summary
x TDS 694C User Manual
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
CAUTION
Refer to Manual WARNING High Voltage Double
Insulated ProtectiveGround
(Earth) Terminal
Acquisition circuitry in the TDS 694C is very susceptible to damage from
electrostatic discharge and from overdrive signals.
To prevent electrostatic damage to the TDS 694C, be sure to operate the
oscilloscope only in a static-controlled environment. Be sure to discharge to
ground any electrostatic charge that may be present on cables and probes before
attaching them to the oscilloscope.
To prevent damage from electrostatic discharge, install short-circuit terminations
on unused input connectors. Always use a wrist strap with internal impedance
(provided with your instrument) when handling your oscilloscope or making
connections.
Symbols and Terms
Electrostatic Discharge

TDS 694C User Manual xi
Preface
This is the User Manual for the TDS 694C Oscilloscopes
The chapter Getting Started briefly describes the TDS 694C Oscilloscopes,
prepares you to install it, and tells you how to put it into service.
The chapter Operating Basics covers basic principles of the operation of the
oscilloscope. The operating interface illustrations and the tutorial examples
rapidly help you understand how your oscilloscope operates.
The chapter Reference teaches you how to perform specific tasks. See page 3–1
for a complete list of operating tasks covered in that chapter.
The Appendices provide an options listing, an accessories listing, and other
useful information.
Related Manuals
The following documents are related to the use or service of the oscilloscope.
HThe TDS Family Digitizing Oscilloscopes Programmer Manual (a diskette
that is included with the user manual) describes using a computer to control
the oscilloscope through the GPIB interface.
HThe TDS 500D, TDS 600C & TDS 700D Digitizing Oscilloscopes Reference
(Quick Reference) gives you a quick overview of how to operate the
oscilloscope.
HThe TDS 500D, TDS 600C, & TDS 700D Technical Reference (Performance
Verification and Specifications) tells how to verify the performance of the
oscilloscope and lists its specifications.
HThe TDS 500B, TDS 600B, TDS 600B, & TDS 700A Service Manual
provides information for maintaining and servicing the oscilloscope to the
module level.
Conventions
In this manual, you will find various procedures which contain steps of
instructions for you to perform. To keep those instructions clear and consistent,
this manual uses the following conventions:
HIn procedures, names of front panel controls and menu labels appear in
boldface print.

Preface
xii TDS 694C User Manual
HNames also appear in the same case (initial capitals or all uppercase) in the
manual as is used on the oscilloscope front panel and menus. Front panel names
are all upper case letters, for example, VERTICAL MENU and CH 1.
HInstruction steps are numbered. The number is omitted if there is only one step.
HWhen steps require that you make a sequence of selections using front panel
controls and menu buttons, an arrow ( ➞ ) marks each transition between a
front panel button and a menu, or between menus. Also, whether a name is a
main menu or side menu item is clearly indicated: Press VERTICAL
MENU ➞Coupling (main) ➞DC (side) ➞Bandwidth (main) ➞
250 MHz (side).
Using the convention just described results in instructions that are graphically
intuitive and simplifies procedures. For example, the instruction just given
replaces these five steps:
1. Press the front-panel button VERTICAL MENU.
2. Press the main-menu button Coupling.
3. Press the side-menu button DC.
4. Press the main-menu button Bandwidth.
5. Press the side-menu button 250 MHz.
Sometimes you may have to make a selection from a pop-up menu: Press
TRIGGER MENU ➞Type (main) ➞Edge (pop-up). In this example, you
repeatedly press the main menu button Type until Edge is highlighted in the
pop-up menu.

TDS 694C User Manual 1–1
Product Description
The Tektronix TDS 694C Digital Real-Time Oscilloscope is a superb tool for
acquiring, displaying, and measuring waveforms. Its performance addresses the
needs of both benchtop lab and portable applications with the following key
features:
HAn analog bandwidth of 3 GHz simultaneous on 4 channels
HA maximum sample rate of up to 10 GS/s simultaneous on 4 channels
HRecords lengths up to 120 K
HUp to 29 automatic measurements and measurement statistics (see Taking
Automated Measurements on page 3–88)
H1% DC vertical gain accuracy (see TDS 500D, TDS600B & TDS 700D
Technical Reference manual)
HInternal floppy disk storage and compatible with Iomega 100 Mbyte Zip
drive (see Saving Waveforms and Setups on page 3–115)
HOptional internal hard drive
HTrigger modes include edge, logic, pulse, delay, modes (see Triggering on
Waveforms on page 3–39)
HJava application support
HTLA 700 Logic Analyzer cross-triggering support

Product Description
1–2 TDS 694C User Manual
HAdvanced features include limit testing (see Limit Testing on page 3–145),
FFT (see Fast Fourier Transforms on page 3–153), waveform differentiation
and integrations (see Waveform Differentiation and Waveform Integration
starting on page 3–172), waveform histograms (see Displaying Histograms
on page 3–104)
HAdjustable channel deskew for increased measurement accuracy (see
Channel/Probe Deskew on page 3–109)
HFull GPIB programmability (see Communicating with Remote Instruments
on page 3–137 and the TDS Family Programmer Manual disk)
HWide array of probing solutions (see Accessory Probes on page 0–3 and
Probe Selection on page 0–1)
HCE, FCC, UL, and CAN/CSE compliant (see TDS 500D, TDS600B &
TDS 700D Technical Reference manual)
HAll 4 channels have 8-bit resolution. (See Table 1–1 on page 1–3.)
HDual Window Zoom, which shows a waveform magnified and unmagnified
on the same display (see Using Dual Window Mode on page 3–35)
HSample, envelope, average, and peak-detect modes (see Table 1–1,
on page 1–3.)

Product Description
TDS 694C User Manual 1–3
TDS 694C Features
Table 1–1 lists some key TDS 694C features that are covered in this manual.
Table 1–1: Key Features of TDS 694C
Feature TDS 694C
No. of channels 4
Digitizingrate,max. 10 GS/s
No. of Channels. @ maximum rate 4
AnalogBandwidth 3 GHz
RecordLengths,max. To 120 K/Channel
AdvancedDSPMath1Std.2
Storage,FloppyDisk Std.2
I/0includes RS–232 and Centronics3Std.2
iomega Zip Drive support Std.2
InputImpedance 50 Wonly
1Advanced digital signal processing provides FFTs, integrals, and derivatives of
waveforms. See Option 2F on page 0–2.
2Std. denotes a standard product feature as opposed to a feature included as part of
an option.
3GPIB I/O included with all models.