Service Manual
TDS 410, 420 & 460
Digitizing Oscilloscopes
070–8036–02
Please check for change information at the rear
of this manual.
Third Edition: February 1994
Last Revised: May 31, 1994
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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Instrument Serial Numbers
Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or stamped on the
chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the
serial number are assigned sequentially and are unique to each instrument. Those manufactured in the United
States have six unique digits. The country of manufacture is identified as follows:
B010000 Tektronix, Inc., Beaverton, Oregon, USA
E200000 Tektronix United Kingdom, Ltd., London
J300000 Sony/Tektronix, Japan
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands
Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit
alpha code to identify the country of manufacture (e.g., JP for Japan, HK for Hong Kong, IL for Israel, etc.).
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
Printed in U.S.A.
Copyright E Tektronix, Inc., 1993, 1994. All rights reserved. Tektronix products are covered by U.S. and
foreign patents, issued and pending. The following are registered trademarks: TEKTRONIX, TEK, TEKPROBE,
and SCOPE-MOBILE.
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.
Table of Contents
Safety Summary xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xxi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Structure xxi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Conventions xxii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modules xxii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety xxii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols xxii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Manuals xxii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction xxiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Servicing xxiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strategy for Servicing xxiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ektronix Service xxiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty Repair Service xxiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair or Calibration Service xxiv. . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Service xxv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Product Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menus 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indicators 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Purpose Knob 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GUI 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal System 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger System 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquisition Control 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On-Board User Assistance 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Help 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Autoset 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Assistance 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cursor 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measure 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Signal Processing (DSP) 1-5. . . . . . . . . . . . . . . . . . . . . . . . .
Storage and I/O 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410, TDS 420 & TDS 460 Service Manual
v
Operating Information
Zoom 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal Traits 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranted Characteristics 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Conditions 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ypical Characteristics 1-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplying Operating Power 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Information 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Voltage 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Backup Power 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Environment 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ventilation Requirements 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applying and Interrupting Power 2-4. . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Up 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Down 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installed Options 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Performance Verification
Operating Information 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screen Layout 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Procedures 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Power Up 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use Help 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use the Status Menu 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Set Functions 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Set Complex Functions 2-12. . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Conventions 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brief Procedures 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Instructions 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vv
Contents
Conventions 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Tests 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verify Internal Adjustment, Self Compensation, and
Diagnostics 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Tests 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verify All Input Channels 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verify the Time Base 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verify the Main and Delayed Trigger Systems 4-9. . . . . . . . . . . . .
Performance Tests 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prerequisites 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Required 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Record 4-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System Checks 4-18. . . . . . . . . . . . . . . . . . . . . . . .
Check Offset Accuracy 4-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check DC Voltage Measurement Accuracy (Averaged) 4-20. . . . .
Check Analog Bandwidth 4-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Delay Match Between Channels 4-27. . . . . . . . . . . . . . . . . .
Time Base System Checks 4-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Accuracy for Long-Term Sample Rate, Delay
Time, and Delta Time Measurements 4-31. . . . . . . . . . . . . . . . .
Trigger System Checks 4-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Accuracy, Trigger Level or Threshold, DC Coupled 4-35. .
Sensitivity, Edge Trigger, DC Coupled 4-38. . . . . . . . . . . . . . . . . . . .
Maximum Input Frequency, Auxiliary Trigger 4-42. . . . . . . . . . . . . .
Check Video Trigger Sensitivity (Option 05 Equipped
Models Only) 4-44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Signal Check 4-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Probe Adjust Output 4-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
TDS 410, TDS 420 & TDS 460 Service Manual
Adjustment Procedures 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements for Performance 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Personnel 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warm-up Period 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Equipment 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Usage 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performing the Adjustments 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complete Adjustment 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Individual Adjustments 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Partial Adjustment 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment After Repair 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Dependencies 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vvv
Maintenance
Equipment Required 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Instructions 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Installation 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Installation 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software-Based Adjustments 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Adjustment 5-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compensate the Probe 5-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measure the Probe Bandwidth 5-11. . . . . . . . . . . . . . . . . . . . . . . . . .
Adjust the Probe — High Frequency Response 5-14. . . . . . . . . . .
Monitor Assembly Adjustment 5-20. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Information 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedures Not In This Section 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventing ESD 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Precautions 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Susceptibility to ESD 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Care 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning Procedures 6-5. . . . . . . . . . . . . . . . . . . . . .
Inspection — Exterior 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Procedure — Exterior 6-6. . . . . . . . . . . . . . . . . . . . . . . . .
Inspection — Interior 6-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Procedure — Interior 6-8. . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v vvv
Removal and Installation Procedures 6-9. . . . . . . . . . . . . . . . . . . . . . . . .
Preparation — Please Read 6-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Modules 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Removal 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Instructions 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Summary of Procedures 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access Procedure 6-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedures for Module Removal and Installation 6-21. . . . . . . . . . .
Front-Panel Knobs and Shafts 6-21. . . . . . . . . . . . . . . . . . . . . . . . . .
Line Fuse and Line Cord 6-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Cover, Rear Cover, Cabinet, Rear EMI Gasket,
and Cabinet Handle and Feet 6-24. . . . . . . . . . . . . . . . . . . . . . .
Trim Ring, Menu Elastomer, Menu Buttons, and Front
EMI Gaskets 6-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A06 Front-Panel Assembly, ESD Shield, and Menu Flex
and Probe Code Flex Circuits 6-31. . . . . . . . . . . . . . . . . . . . . . .
A05 Attenuator Assembly and Shield 6-34. . . . . . . . . . . . . . . . . . . .
A26 Monitor Assembly 6-37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents
Options
A08 Jumper Board Assembly, D1 Bus, and Board Supports 6-40.
A03 CPU Assembly 6-41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A02 Display Assembly 6-43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A09 DSP Assembly 6-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A01 Backplane Assembly and its Mount 6-46. . . . . . . . . . . . . . . . . .
Back-up Batteries 6-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A25 Low Voltage Power Supply and its Mount 6-51. . . . . . . . . . . . .
Fan and Fan Mount 6-54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Filter 6-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A07 Auxiliary Power Supply 6-58. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A04 Acquisition Assembly 6-60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Chassis 6-62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly for Cleaning 6-62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6-65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics 6-65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Updates 6-66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Equipment 6-67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Console Port Set Up 6-67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Parts List
Diagrams
Mechanical Parts List
Options and Accessories 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Electrical Parts List 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts List 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10-2. . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410, TDS 420 & TDS 460 Service Manual
ix
x
Contents
List of Illustrations
Figure 2-1: Power-Cord Plug Identification 2-3. . . . . . . . . . . . . . . . . . . . . .
Figure 2-2: Map of Display Functions 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-1: Map of Display Functions 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-2: Verifying Adjustments and Signal Path Compensation 4-5. .
Figure 4-3: Universal Test Hookup for Functional T ests 4-7. . . . . . . . . . .
Figure 4-4: Initial Test Hookup 4-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-5: Initial Test Hookup 4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-6: Initial Test Hookup (TDS 410 and TDS 420) 4-23. . . . . . . . . . .
Figure 4-7: Initial Test Hookup (TDS 460) 4-23. . . . . . . . . . . . . . . . . . . . . . .
Figure 4-8: Measurement of Analog Bandwidth 4-26. . . . . . . . . . . . . . . . . .
Figure 4-9: Initial Test Hookup 4-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-10: Measurement of Channel Delay 4-30. . . . . . . . . . . . . . . . . . . .
Figure 4-11: Initial Test Hookup 4-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-12: Measurement of Accuracy — Long-Term and
Delay-Time 4-33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-13: Initial Test Hookup 4-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-14: Initial Test Hookup 4-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-15: Measurement of Trigger Sensitivity 4-40. . . . . . . . . . . . . . . . .
Figure 4-16: Initial Test Hookup 4-42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-17: Confirming Auxiliary Triggering at Maximum
Triggering Frequency 4-43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-18: Initial Test Hookup 4-44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-19: Adjusting Sync Pulse Amplitude 4-45. . . . . . . . . . . . . . . . . . . .
Figure 4-20: Measurement of Video Sensitivity 4-46. . . . . . . . . . . . . . . . . . .
Figure 4-21: Initial Test Hookup 4-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-22: Measurement of Probe Compensator Limits 4-49. . . . . . . . . .
TDS 410, TDS 420 & TDS 460 Service Manual
Figure 5-1: Hookup for Probe Compensation 5-9. . . . . . . . . . . . . . . . . . . .
Figure 5-2: Performing Probe Compensation 5-10. . . . . . . . . . . . . . . . . . . .
Figure 5-3: Proper and Improper Probe Compensation 5-10. . . . . . . . . . . .
Figure 5-4: Exposing the Inner Probe Tip 5-11. . . . . . . . . . . . . . . . . . . . . . . .
Figure 5-5: Initial Test Hookup (TDS 410 and TDS 420 Only) 5-12. . . . . .
Figure 5-6: Initial Test Hookup (TDS 460 Only) 5-12. . . . . . . . . . . . . . . . . . .
Figure 5-7: Exposing the Probe Body 5-14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5-8: Initial Test Hookup (TDS 410 and TDS 420 Only) 5-15. . . . . .
Figure 5-9: Initial Test Hookup (TDS 460 Only) 5-15. . . . . . . . . . . . . . . . . . .
Figure 5-10: Probe Test Hookup (TDS 410 and TDS 420 Only) 5-17. . . .
Figure 5-11: Probe Test Hookup (TDS 460 Only) 5-17. . . . . . . . . . . . . . . . .
Figure 5-12: Locations of Probe Adjustments 5-18. . . . . . . . . . . . . . . . . . . .
xx
Figure 5-13: Adjustments vs. Front-Corner Response 5-19. . . . . . . . . . . . .
Figure 5-14: Monitor Adjustment Locations 5-21. . . . . . . . . . . . . . . . . . . . . .
Figure 5-15: Five and Ten Percent Luminance Patches 5-22. . . . . . . . . . .
Figure 5-16: Composite Pattern for Focusing 5-23. . . . . . . . . . . . . . . . . . . .
Figure 5-17: External Graticule Limit Lines 5-25. . . . . . . . . . . . . . . . . . . . . .
Figure 6-1: Oscilloscope Orientation 6-11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-2: Cabinet and Front-Panel Mounted Modules 6-15. . . . . . . . . . .
Figure 6-3: Internal Modules 6-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-4: Cables and Cable Routing 6-20. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-5: Knob and Shaft Removal 6-22. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-6: Line Fuse and Line Cord Removal 6-23. . . . . . . . . . . . . . . . . . .
Figure 6-7: Front Cover, Rear Cover, Cabinet, EMI Gasket, and
Cabinet Handle and Feet Removal 6-25. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-8: Trim Ring, Menu Elastomer, and Menu Buttons
Removal 6-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-9: EMI Gasket Removal and Installation 6-30. . . . . . . . . . . . . . . .
Figure 6-10: A06 Front-Panel Assembly, ESD Shield, and Menu
Flex and Probe Code Flex Circuits Removal 6-32. . . . . . . . . . . . . . . . . .
Figure 6-1 1: Disassembly of the Front-Panel Assembly 6-33. . . . . . . . . . .
Figure 6-12: A05 Attenuator Removal 6-35. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-13: A26 Monitor Assembly Removal 6-39. . . . . . . . . . . . . . . . . . . .
Figure 6-14: A08 Jumper Board Assembly, D1 Bus, and
Board Supports Removal 6-41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-15: A03 CPU Removal 6-42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-16: A02 Display Assembly Removal 6-44. . . . . . . . . . . . . . . . . . . .
Figure 6-17: A09 DSP Assembly Removal 6-46. . . . . . . . . . . . . . . . . . . . . .
Figure 6-18: A01 Backplane Assembly and its Mount Removal 6-48. . . . .
Figure 6-19: Battery Removal 6-50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-20: A25 Low Voltage Power Supply Removal 6-52. . . . . . . . . . . .
Figure 6-21: Fan and Fan Mount Removal 6-55. . . . . . . . . . . . . . . . . . . . . .
Figure 6-22: Line Filter Removal 6-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-23: Auxiliary Power Supply Removal 6-59. . . . . . . . . . . . . . . . . . .
Figure 6-24: A04 Acquisition Board Removal 6-61. . . . . . . . . . . . . . . . . . . .
Figure 6-25: Accessing the Protection Switch 6-66. . . . . . . . . . . . . . . . . . . .
Figure 6-26: Console Port Connections 6-69. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-27: Primary Troubleshooting Procedure 6-70. . . . . . . . . . . . . . . . .
Figure 6-28: A03 CPU Board Connector P1 6-71. . . . . . . . . . . . . . . . . . . . .
Figure 6-29: Module Isolation Troubleshooting Procedure 6-72. . . . . . . . .
Figure 6-30: Low Voltage Power Supply Troubleshooting Procedure 6-74
Figure 6-31: Power Supply Overload Troubleshooting Procedure 6-76. . .
Figure 6-32: A25 Low Voltage Power Supply Module (Right Side) 6-77. .
Figure 6-33: Monitor Troubleshooting Procedure 6-78. . . . . . . . . . . . . . . . .
Figure 6-34: Horizontal and Vertical Sync Signals 6-79. . . . . . . . . . . . . . . .
xxx
Contents
Figure 6-35: A Video Signal with White, Black, and Blanking Levels 6-79
Figure 6-36: A26 Monitor Connector J440 6-80. . . . . . . . . . . . . . . . . . . . . . .
Figure 6-37: A07 Auxiliary Power Connectors J4 and J7 6-80. . . . . . . . . .
Figure 6-38: A02 Display Connector J2 6-81. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-39: Processor/Front Panel Troubleshooting Procedure 6-82. . . .
Figure 6-40: A06 Front Panel Board Power Connectors J101
and J106 6-83. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-41: Attenuator/Acquisition Troubleshooting Procedure 6-84. . . .
Figure 6-42: A08 Jumper and A05 Attenuator Boards Signal
Locations 6-85. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-43: Acquisition and Attenuator Power Troubleshooting
Procedure 6-86. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-44: A04 Acquisition Board Power Connector 6-87. . . . . . . . . . . . .
Figure 6-45: Backplane Troubleshooting Procedure 6-88. . . . . . . . . . . . . .
Figure 6-46: A01 Backplane Module 6-90. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6-47: I2C Isolation Troubleshooting Procedure 6-91. . . . . . . . . . . . .
Figure 6-48: Console Troubleshooting Procedure 6-92. . . . . . . . . . . . . . . .
Figure 9-1: TDS 400 Interconnections 9-2. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9-2: TDS 400 Block Diagram 9-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10-1: External and Front Panel Modules 10-7. . . . . . . . . . . . . . . . . .
Figure 10-2: Internal Modules 10-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10-3: Cables and Routing 10-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410, TDS 420 & TDS 460 Service Manual
x xxx
xx
Contents
List of Tables
Table 1-1: Record Length vs. Divisions per Record 1-3. . . . . . . . . . . . . . .
Table 1-2: Nominal Traits — Signal Acquisition System 1-7. . . . . . . . . . .
Table 1-3: Nominal Traits — Time Base System 1-8. . . . . . . . . . . . . . . . .
Table 1-4: Nominal Traits — Triggering System 1-9. . . . . . . . . . . . . . . . . .
Table 1-5: Nominal Traits — Display System 1-9. . . . . . . . . . . . . . . . . . . .
Table 1-6: Nominal Traits — Data Storage 1-9. . . . . . . . . . . . . . . . . . . . . .
Table 1-7: Nominal Traits — GPIB Interface, Video Output, and
Power Fuse 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-8: Nominal Traits — Mechanical 1-10. . . . . . . . . . . . . . . . . . . . . . . .
Table 1-9: Warranted Characteristics — Signal Acquisition System 1-12.
Table 1-10: Warranted Characteristics — Time Base System 1-14. . . . . .
Table 1-11: Warranted Characteristics — Triggering System 1-15. . . . . .
Table 1-12: Warranted Characteristics — Probe Compensator
Output 1-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-13: Power Requirements 1-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-14: Warranted Characteristics — Environmental, Safety,
and Reliability 1-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-15: Typical Characteristics — Signal Acquisition System 1-18. .
Table 1-16: Typical Characteristics — Time Base System 1-19. . . . . . . . .
Table 1-17: Typical Characteristics — Triggering System 1-19. . . . . . . . .
Table 1-18: Typical Characteristics — Data Handling 1-20. . . . . . . . . . . . .
Table 2-1: Power Cord Conductor Identification 2-2. . . . . . . . . . . . . . . . . .
Table 2-2: Effects of Corrupted Data 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-1: Test Equipment 4-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-2: DC Offset Accuracy 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-3: Analog Bandwidth (TDS 410 and TDS 420) 4-25. . . . . . . . . . . .
Table 4-4: Analog Bandwidth (TDS 460) 4-25. . . . . . . . . . . . . . . . . . . . . . . .
Table 5-1: Adjustments Required for Module Replaced 5-3. . . . . . . . . . .
Table 5-2: Adjustments and Dependencies 5-4. . . . . . . . . . . . . . . . . . . . .
Table 5-3: Test Equipment, Fixtures, and Supplies 5-5. . . . . . . . . . . . . . .
Table 5-4: GPIB Board Configuration 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6-1: Relative Susceptibility to Static-Discharge Damage 6-3. . . . .
Table 6-2: External Inspection Check List 6-6. . . . . . . . . . . . . . . . . . . . . . .
Table 6-3: Internal Inspection Check List 6-7. . . . . . . . . . . . . . . . . . . . . . .
Table 6-4: Tools Required for Module Removal 6-12. . . . . . . . . . . . . . . . . .
Table 6-5: Access Instructions for Modules in Figure 6-2 6-14. . . . . . . . . .
Table 6-6: Access Instructions for Modules in Figure 6-3 6-16. . . . . . . . . .
Table 6-7: Access (and Removal) Instructions for Cables
in Figure 6-4 6-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 410, TDS 420 & TDS 460 Service Manual
xx
Table 6-8: Troubleshooting Test Equipment, Fixtures, and Supplies 6-67
Table 6-9: Connections for a 9 to 25 Pin Null Modem Cable 6-68. . . . . . .
Table 6-10: Diagnostic Failure Priority List 6-73. . . . . . . . . . . . . . . . . . . . . .
Table 6-11: Normal Output Voltage 6-75. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6-12: Power Supply Maximum Current 6-77. . . . . . . . . . . . . . . . . . . .
Table 6-13: Front Panel Connector Voltages 6-83. . . . . . . . . . . . . . . . . . . .
Table 6-14: Channel and P1 Signal Locations 6-85. . . . . . . . . . . . . . . . . . .
Table 6-15: A05 Attenuator Board Power 6-86. . . . . . . . . . . . . . . . . . . . . . .
Table 6-16: A04 Acquisition Board Power 6-86. . . . . . . . . . . . . . . . . . . . . . .
Table 6-17: Regulator Voltages 6-89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6-18: J7 Voltages 6-89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6-19: J8 Front Panel Voltages 6-89. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-1: International Power Cords 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-2: Standard Accessories 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-3: Probe Accessories 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-4: Optional Accessories 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-5: Probe Accessories 7-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7-6: Accessory Software 7-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xx
Contents
Service Safety Summary
Please take a moment to review these safety precautions. They are provided
for your protection and to prevent damage to the digitizing oscilloscope. This
safety information applies to all operators and service personnel.
Symbols and Terms
These two terms appear in manuals:
H
statements identify conditions or practices that could result in
damage to the equipment or other property.
H
statements identify conditions or practices that could result in
personal injury or loss of life.
These two terms appear on equipment:
H
CAUTION
indicates a personal injury hazard not immediately accessible
as one reads the marking, or a hazard to property including the equipment
itself.
H
DANGER
indicates a personal injury hazard immediately accessible as
one reads the marking.
This symbol appears in manuals:
Static-Sensitive Devices
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
These symbols appear on equipment:
DANGER
High Voltage
Protective
ground (earth)
terminal
ATTENTION
Refer to
manual
xxx
Specific Precautions
Observe all of the following precautions to ensure your personal safety and to
prevent damage to either the digitizing oscilloscope or the equipment connected to it.
Do Not Perform Service While Alone
Do not perform internal service or adjustment of this product unless another
person capable of rendering first aid and resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product. To avoid personal
injury, do not touch exposed connections or components while power is on.
Disconnect power before removing protective panels, soldering, or replacing
components.
Power Source
The digitizing oscilloscope is intended to operate from a power source that will
not apply more than 250 V
either supply conductor and ground. A protective ground connection, through
the grounding conductor in the power cord, is essential for safe system operation.
between the supply conductors or between
RMS
Grounding the Digitizing Oscilloscope
The digitizing oscilloscope is grounded through the power cord. To avoid
electric shock, plug the power cord into a properly wired receptacle where
earth ground has been verified by a qualified service person. Do this before
making connections to the input or output terminals of the digitizing oscilloscope.
Without the protective ground connection, all parts of the digitizing oscilloscope are potential shock hazards. This includes knobs and controls that may
appear to be insulators.
Use the Proper Power Cord
Use only the power cord and connector specified for your product. Use only a
power cord that is in good condition.
Use the Proper Fuse
To avoid fire hazard, use only the fuse specified in the parts list for your product, and which is identical in type, voltage rating, and current rating.
x xxx
Safety Summary
Do Not Remove Covers or Panels
To avoid personal injury, do not operate the digitizing oscilloscope without the
panels or covers.
Do Not Operate in Explosive Atmospheres
The digitizing oscilloscope provides no explosion protection from static discharges or arcing components. Do not operate the digitizing oscilloscope in an
atmosphere of explosive gasses.
Electric Overload
Never apply a voltage to a connector on the digitizing oscilloscope that is
outside the range specified for that connector.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
xx
xx
Safety Summary
Preface
This service manual provides service information for the TDS 410, TDS 420,
and TDS 460 Digitizing Oscilloscopes.
If servicing a TDS 410, follow the procedures for the TDS 420, but
ignore all references to CH 3 and CH 4.
Manual Structure
This manual is divided into sections, such as
Operation
and
Sections containing procedures also contain introductions to those proce-
dures. Be sure to read these introductions, because they provide information
needed to do the service correctly and efficiently. The following is a brief
description of each manual section.
H
H
H
H
. Further, it is divided into subsections, such as
Removal and Installation Procedures.
Specifications
scope and tables of the characteristics and descriptions that apply to it.
Operating Information
this manual is structured, as well as general information and operating
instructions at the level needed to safely power up and service this oscilloscope. A statement of the service strategy that this manual supports, as
well as instructions for shipment of the digitizing oscilloscope, are found in
this section.
Theory of Operation
service and fault isolation.
Performance Verification
firming that this digitizing oscilloscope functions properly and meets
warranted limits.
— contains a product description of the digitizing oscillo-
— is this section. It includes a description of how
— contains circuit descriptions that support general
— contains a collection of procedures for con-
Specifications and Theory of
Product Description
TDS 410, TDS 420 & TDS 460 Technical Reference
Adjustment Procedures
H
ing this digitizing oscilloscope to meet warranted limits.
Maintenance
H
and corrective maintenance of the digitizing oscilloscope. Instructions for
cleaning, for module removal and installation, and for fault isolation to a
module are found here.
Options
H
options that may be present in your oscilloscope.
Electrical Parts List
H
cal Parts List,
See below
H
Diagrams
useful for isolating failed modules.
— contains information and procedures for doing preventive
— contains information on servicing any of the factory-installed
where both electrical and mechanical modules are listed.
.
— contains a block diagram and an interconnection diagram
— contains a collection of procedures for adjust-
— contains a statement referring you to the
Mechani-
xx
H
Mechanical Parts List
descriptions, and their Tektronix part numbers
— includes a table of all replaceable modules, their
.
Manual Conventions
This manual uses certain conventions which you should become familiar with
before doing service.
Modules
Throughout this manual, any replaceable component, assembly, or part of this
digitizing oscilloscope is referred to generically as a module. In general, a
module is an assembly, like a circuit board, rather than a component, like a
resistor or an integrated circuit. Sometimes a single component is a module;
for example, the chassis of the oscilloscope is a module.
Safety
Symbols and terms related to safety appear in the Safety Summary found at
the beginning of this manual.
Symbols
Besides the symbols related to safety, this manual uses the following symbols:
The “stop sign” icon labels information which must be read in order to
correctly do service and to avoid incorrectly using or applying service
procedures.
Related Manuals
The clock icon labels procedure steps which require a pause to wait
for the oscilloscope to complete some operation before you can
continue.
Various icons such as the example icon at the left are used in procedures to help identify certain readouts and menu functions on screen.
These other manuals are available for the TDS 410, TDS 420, and TDS 460
Digitizing Oscilloscopes.
H
H
H
Reference
The
scope.
User
The
Programmer Manual
The
and remote control of the oscilloscope through the GPIB.
gives you a quick overview of how to operate your oscillo-
provides instructions on how to operate your oscilloscope.
provides complete information on programming
xxx
Preface
Introduction
This section contains general information critical to safe and effective servicing of this oscilloscope, the manual service strategy, and a description of
repair and warranty services available from Tektronix.
Before Servicing
Strategy for
Servicing
This manual is for servicing the TDS 410, TDS 420, & TDS 460 Digitizing
Oscilloscopes. To prevent injury to yourself or damage to the oscilloscope, do
the following before you attempt service:
H
Be sure you are a qualified service person;
H
Read the Safety Summary found at the beginning of this manual;
H
When using this manual for servicing, be sure to heed all warnings, cautions,
and notes.
This manual contains all the information needed for periodic maintenance of
your oscilloscope. (Examples of such information are procedures for checking
performance and for readjustment.) Further, it contains all information for
corrective maintenance down to the module level. This means that the procedures, diagrams, and other troubleshooting aids help isolate failures to a
specific module, rather than to components of that module. Once a failure is
isolated, replace the module with a fully tested module obtained from the
factory.
Strategy for Servicing
Read
tion.
If servicing a TDS 410, follow the procedures for the TDS 420, but
ignore all references to CH 3 and CH 4.
Throughout this manual, any field-replaceable component, assembly,
or part of this oscilloscope is referred to generically as a module.
and
Supplying Operating Power
in this sec-
TDS 410, TDS 420 & TDS 460 Service Manual
All modules are listed in Section 10,
to a module, use the fault isolation procedures found in Section 6,
nance.
Removal and Installation Procedures
To remove and replace any failed module, follow the instructions in
Mechanical Parts List.
, also found in Section 6.
To isolate a failure
Mainte-
x xxx
Tektronix Service
Tektronix provides service to cover repair under warranty as well as other
services that may provide a cost-effective answer to your service needs.
Whether providing warranty repair service or any of the other services listed
below, Tektronix service technicians, trained on Tektronix products, are best
equipped to service your digitizing oscilloscope. Tektronix technicians are
appraised of the latest information on improvements to the product as well as
the latest new options to the product.
Warranty Repair Service
Tektronix warrants this product for three years from date of purchase, excluding probes for which the warranty is one year. (The warranty appears on the
back of the title page in this manual.) Tektronix technicians provide warranty
service at most Tektronix service locations worldwide. Your Tektronix product
catalog lists all service locations worldwide.
Repair or Calibration Service
The following services may be purchased to tailor repair and/or calibration of
your digitizing oscilloscope to fit your requirements.
Option 9C — When you order your digitizing oscilloscope with option 9C, it
is shipped with a
provides traceability to the National Institute of Standards and Technology
(NIST). It certifies procedures used to calibrate the oscilloscope comply with
U. S. Military Standard 45662A.
Certificate of Calibration and Test Data.
This certificate
At-Depot Service — Tektronix offers several standard-priced adjustment
(calibration) and repair services:
H
A single repair and/or adjustment.
H
Calibrations using equipment and procedures that meet the traceability
standards specific to the local area.
H
Annual maintenance agreements that provide for either calibration and
repair or calibration only of the oscilloscope.
Of these services, the annual maintenance agreement offers a particularly
cost-effective approach to service for many owners of the TDS 420 &
TDS 460 Digitizing Oscilloscopes. Such agreements can be purchased to
span several years.
On-Site Service — The annual maintenance agreement can be purchased
with on-site service, with repair and calibration done at your facility. This
service reduces the time your oscilloscope is out of service when calibration
or repair is required.
xx
Introduction
Self Service
Tektronix supports repair to the module level by providing
and
Module Repair and Return
.
Module Exchange
Module Exchange — This service reduces down time for repair by allowing
you to exchange most modules for remanufactured ones. Tektronix ships you
an updated and tested exchange module from the Beaverton, Oregon service
center, typically within 24 hours. Each module comes with a 90-day service
warranty.
Module Repair and Return — This service returns to you within 10 days
the same module that you shipped to Tektronix. The module shipped is repaired, tested, and returned to you from the Beaverton, Oregon service
not
center. It is
each module comes with a 90-day service warranty.
updated to match current modules of the same type. Again,
For More Information — Contact your local Tektronix service center or
sales engineer for more information on any of the repair or adjustment services just described.
TDS 410, TDS 420 & TDS 460 Service Manual
xx
xx
Introduction
Specifications
Product Description
This subsection begins with a general description of the traits of the
TDS 400 Digitizing Oscilloscopes. Three subsections follow, one for each of
three classes of traits:
characteristics
.
nominal traits, warranted characteristics,
and
typical
General
Tektronix TDS 400 Digitizing Oscilloscopes are portable instruments suitable
for use in a variety of test and measurement applications and systems. Key
features include:
H
Four input channels on the TDS 420 and TDS 460 (two input channels on
the TDS 410), each with a record length of 500 to 15,000 points and 8-bit
vertical resolution. (Option 1M extends the maximum record length to
60,000 points.)
H
Simultaneous acquisition of waveforms in all channels at the maximum
digitizing rate of 100 Megasamples/second. All channels acquire at the
full analog bandwidth of 150 MHz (TDS 410 and TDS 420) or 350 MHz
(TDS 460) and all have the same features.
H
Video triggering capabilities (with Option 5, Video Trigger).
H
Full programmability and printer/plotter output.
H
Advanced functions, such as continuously updated measurements.
H
Specialized display modes, such as infinite and variable persistence.
H
A unique graphical user interface (GUI), an on-board help mode, and a
logical front-panel layout which combine to deliver a new standard in
usability.
H
Advanced waveform math (with Option 2F, Advanced DSP Math). Compute and display the integral of a waveform, the differential of a waveform, and the FFT (Fast Fourier Transform) of a waveform.
User Interface
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
This digitizing oscilloscope uses a combination of front-panel buttons, knobs,
and on-screen menus to control its many functions. The front-panel controls
are grouped according to function: vertical, horizontal, trigger, and special.
Within each group, any function likely to get adjusted often, such as vertical
positioning or the time base setting, is set directly by its own front-panel knob.
1Ć1
Product Description
Menus
Those functions for which control settings are usually changed less often,
such as vertical coupling and horizontal mode, are set indirectly. That is,
pressing one (sometimes two) front-panel button, such as vertical menu,
displays a menu of functions at the bottom of the screen that are related to
that button. (For the button vertical menu, the menu displayed contains
functions such as coupling and bandwidth.) Using the buttons below this
menu to select a function, such as coupling, displays a
for that function, such as AC, DC, or GND (ground) coupling, at the right side
of the screen. Use the buttons to the right of the menu to select a setting,
such as DC.
side
menu of settings
main
Indicators
Several on-screen readouts help you keep track of the settings for various
functions, such as vertical and horizontal scale and trigger level. There are
also readouts to display the results of measurements made using cursors or
using the automatic parameter extraction feature (called measure) and readouts to display the status of the instrument.
Signal Acquisition
System
General Purpose Knob
Menus can also be used to assign the general purpose knob to adjust a
selected parameter function. The method employed is the same as for
a function, except the final selection in the side menu causes the general
ing
adjust
purpose knob to
cursors on screen, or the setting for the fine gain of a channel.
some function, such as the position of measurement
select-
GUI
The user interface also makes use of a GUI, or Graphical User Interface, to
make setting functions and interpreting the display more intuitive. Some
menus and status are displayed using iconic representations of function
settings such as those shown here for full, 100 MHz, and 20 MHz bandwidth.
Such icons allow you to more readily determine status or the available settings.
The signal acquisition system provides vertical channels with calibrated
vertical scale factors from 1 mV to 10 V per division. All input channels can be
acquired simultaneously .
You can display, vertically position, and offset each input channel. You can
also limit their bandwidth (to either 100 MHz or 20 MHz), specify their vertical
coupling, and adjust their fine gain.
1Ć2
Specifications
Product Description
Besides the input channels, up to three math waveforms and four reference
waveforms are available for display. (A math waveform results when you
specify operations, such as add or invert; a reference waveform results when
you save a live waveform in a reference memory.)
Horizontal System
There are three horizontal display modes: main only, main intensified, and
delayed only. Y ou can select among various horizontal record length settings
(see Table 1-1).
Table 1-1: Record Length vs. Divisions per Record
Record Length
1, 2
Divisions per Record
(50 Points/Division)
60,000 1200 divs
30,000 600 divs
15,000 300 divs
5,000 100 divs
2,500 50 divs
1,000 20 divs
500 10 divs
1
The 30,000 and 60,000 point record lengths are available only with Option 1M.
2
The maximum record length of 60,000 points for oscilloscopes equipped with Option 1M
reduces to 15,000 points when operating in Hi Res or Average acquisition mode.
Both the delayed only display and the intensified zone on the main intensified
display can be delayed by time with respect to the main trigger. Both can be
set to display immediately after the delay (delayed runs after main mode); the
delayed display can also be set to display at the first valid trigger after the
delay (delayed triggerable mode).
The delayed display (or the intensified zone) can also be delayed by a selected number of events. In such a case, the events source is the delayed
trigger source. For any events signal, the delayed-trigger system conditions
the signal by determining the source, coupling, etc., of that signal.
At time base settings of 20 ms per division or slower the records are displayed using Roll mode. Both untriggered roll and triggered roll modes are
available.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć3
Product Description
Trigger System
Acquisition Control
The triggering system comprises a complete set of features for triggering the
signal-acquisition system. In edge trigger mode, you can select the source,
slope, coupling, mode (auto or normal), and holdoff.
Oscilloscopes ordered with Option 5 also have the video trigger mode. This
trigger mode allows triggering on NTSC-standard, PAL-standard, SECAMstandard, or custom video waveforms. You can configure the triggering for
interlaced or non-interlaced scanning, different scan rates, field selection, line
selection, and for delay by line or time.
You can choose where the trigger point is located within the acquired waveform record by selecting the amount of pretrigger data displayed. Presets of
10%, 50%, and 90% of pretrigger data can be selected in the horizontal
menu, or the General Purpose knob can be assigned to set pretrigger data to
any value within the limits of trigger position resolution.
Depending on your measurement requirements, you can specify the mode
and manner in which signals are acquired and processed:
H
You can select equivalent-time sampling on repetitive signals or interpolation of points sampled on non-repetitive signals. Both can increase the
apparent sample rate on the waveform when maximum real-time rates
are reached.
On-Board User
Assistance
H
Peak-detect, high-resolution, sample, envelope, and average modes can
be used to acquire signals.
H
The acquisition can be set to stop after a single acquisition (or sequence
of acquisitions if acquiring in average or envelope modes).
Two features that help you set up this digitizing oscilloscope to make your
measurements are help and autoset.
Help
Help displays operational information about any front-panel control. When
help mode is in effect, manipulating any front-panel control causes the digitizing oscilloscope to display information about that control. When help is first
invoked, an introduction to help is displayed on screen.
Autoset
Autoset automatically sets up the digitizing oscilloscope for a viewable display
based on the input signal.
1Ć4
Specifications
Product Description
Measurement
Assistance
Once you have set up to make your measurements, the features cursor and
measure can help you quickly make those measurements.
Cursor
Two types of cursors are provided for making parametric measurements on
the displayed waveforms. Voltage can be measured between the positions of
H Bar (horizontal) cursors, and time can be measured between V Bar (vertical) cursors. These are delta measurements; that is, measurements based on
the difference between two cursors.
Both V Bar and H Bar cursors can also be used to make absolute measurements—measurements relative to a defined level or event. In the case of the
H Bars, either cursor can be selected to read out its voltage with respect to
the ground reference level of any channel; in the case of the V Bars, its time
with respect to the trigger point (event) of the acquisition.
For time measurements, units can be either seconds or Hertz (for 1/time).
Measure
Measure can automatically extract parameters from the signal input to the
digitizing oscilloscope. Any four out of the more than 20 parameters available
can be displayed to the screen. The displayed parameters are extracted
continuously and the results updated on-screen as the digitizing oscilloscope
continues to acquire waveforms.
Storage and I/O
Digital Signal Processing (DSP)
An important component of the multiprocessor architecture of this digitizing
oscilloscope is Tektronix proprietary digital signal processor, the DSP. This
dedicated processor supports advanced analysis of your waveforms when
doing such compute-intensive tasks as interpolation, waveform math, and
signal averaging. It also teams with a custom display system to deliver specialized display modes (see
You can save acquired waveforms in any of four nonvolatile REF (reference)
memories. Any or all of the saved waveforms can be displayed for comparison with the waveforms being currently acquired.
You can choose the source and destination of waveforms to be saved. You
can save any of the input channels to any REF memory or move a stored
reference from one REF memory to another. You can also write reference
waveforms into a REF memory location via the GPIB interface.
The digitizing oscilloscope is fully controllable and capable of sending and
receiving waveforms over the GPIB interface (IEEE Std 488.1-1987/IEEE Std
488.2-1987 standard). This feature makes the instrument ideal for making
automated measurements in a production or research and development
Display
, later in this description).
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć5
Product Description
environment that calls for repetitive data taking. Self-compensation and
self-diagnostic features built into the digitizing oscilloscope to aid in fault
detection and servicing are also accessible using commands sent from a
GPIB controller.
Another standard feature is hardcopy. This feature allows you to output
waveforms and other on-screen information to a variety of graphic printers
and plotters from the digitizing oscilloscope front panel, providing hard copies
without requiring you to put the digitizing oscilloscope into a system-controller
environment. The hard copies obtained are WYSIWYG (What-You-See-IsWhat-You-Get), based on what is displayed at the time hardcopy is invoked.
A VGA-compatible video output, available at the rear panel, is also standard
with the TDS 400 digitizing oscilloscope.
Display
The TDS 400 Digitizing Oscilloscopes offer flexible display options. You can
customize the following attributes of your display:
H
Intensity: waveforms, readouts, graticule, etc.
H
Style of waveform display(s): vectors or dots, intensified or non-intensified
samples, and infinite or variable persistence
H
Display format: XY or YT and graticule type
Zoom
This digitizing oscilloscope also provides an easy way to focus in on those
waveform features you wish to examine up close. By invoking zoom, you can
magnify the waveform parameter using the vertical and horizontal controls to
expand (or contract) and position it for viewing.
1Ć6
Specifications
Nominal traits are described using simple statements of fact such as “Four, all
identical” for the trait “Input Channels, Number of,” rather than in terms of
limits that are performance requirements.
Table 1-2: Nominal Traits — Signal Acquisition System
Nominal Traits
Name
Description
Bandwidth Selections 20 MHz, 100 MHz, and FULL (TDS 410 and TDS 420: 150 MHz,
TDS 460: 350 MHz)
Digitizers, Number of TDS 410: Two, both identical
TDS 420 and TDS 460: Four, all identical
Digitized Bits, Number of 8 bits
1
Input Channels, Number of TDS 410: Two, both identical, called CH 1 and CH 2
TDS 420 and TDS 460: Four, all identical, called CH 1 through CH 4
Input Coupling DC, AC, or GND
Input Resistance Selections
Ranges, Offset, All Channels Volts/Div Setting
1 M
W or 50
W
1 mV/div to 99.5 mV/div
100 mV/div to 995 mV/div
1 V/div to 10 V/div
Offset Range
V
V
V
Range, Position divisions
Range, Sensitivity
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 resolved by the 8-bit A-D Converter, 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 1 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.
2
1 mV/div to 10 V/div
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć7
Nominal Traits
Table 1-2: Nominal Traits — Signal Acquisition System (Cont.)
Name Description
Rise Time
(TDS 410 and TDS 420)
3
Volts/Div Setting
5 mV/div–10 V/div
2 mV/div–4.98 mV/div
1 mV/div–1.99 mV/div
Rise Time
2.3 ns
3.2 ns
3.9 ns
Rise Time
(TDS 460)
3
Rise time is defined by the following formula:
3
Volts/Div Setting
5 mV/div–10 V/div
2 mV/div–4.98 mV/div
1 mV/div–1.99 mV/div
RiseĄTimeĄ(ns)+
BWĄ(MHz
350
Rise Time
1.0 ns
1.4 ns
3.5 ns
)
Table 1-3: Nominal Traits — Time Base System
Name
Range, Sample-Rate
1,3
Range, Equivalent Time or Interpolated Waveform Rate
2,3
Description
2.5 Samples/s to 100 MSamples/s
200 MSamples/s to 50 GSamples/s
Range, Seconds/Division 1 ns/div to 20 s/div
Range, Time Base Delay Time 0 to 20 seconds (settings of 20 ms and slower are displayed in roll
mode)
Reference Frequency, Time Base 100 MHz
Record Length Selection 500 points, 1,000 points, 2,500 points, 5,000, and 15,000 points.
Record lengths of 30,000 and 60,000 points are available with Op-
tion 1M.
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 range of waveform rates for equivalent time or interpolated waveform records.
3
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 interpola tion 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.
4
The maximum record length of 60,000 points available with Option 1M is selectable with all acquisition modes except Hi Res and
Average. In Hi Res and Average, the maximum record length is 15,000 points.
1Ć8
4
Specifications
Table 1-4: Nominal Traits — Triggering System
Nominal Traits
Name
Description
Range, Events Delay 1 to 9,999,999
Ranges, Trigger Level or Threshold Source
Any Channel
Line
Range
screen
Volts
Table 1-5: Nominal Traits — Display System
Name
Description
Video Display Resolution 640 pixels horizontally by 480 pixels vertically in a display area of
5.04 inches horizontally by 3.78 inches vertically
Waveform Display Graticule A single graticule 401 501 pixels (8 10 divisions, with divisions
that are 1 cm by 1 cm)
Waveform Display Grey Scale 16 levels in infinite-persistence and variable-persistence display
styles
Table 1-6: Nominal Traits — Data Storage
Name
Description
Capacity, Nonvolatile Waveform Memory Standard Instrument: Total capacity is 60,000 points.
Option 1M Equipped Instrument: Total capacity is 60,000 points
(one to four waveforms acquired with any combination of record
lengths that add up to 60,000 points). For available record lengths,
see “Record Length Selection” on page 1-8 of this section.
Capacity, Nonvolatile Setup Memory Ten setups.
Batteries1 Required Two lithium poly-carbon monofluoride. Both are type BR2/3A, UL
listed. Both are rated at 3.0 volt, 1.2 amp-hour.
1
Batteries are not accessible from the outside of the instrument; therefore, they can only be replaced by a service technician.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć9
Nominal Traits
Table 1-7: Nominal Traits — GPIB Interface, Video Output, and Power Fuse
Name
Description
Interface, GPIB GPIB interface complies with IEEE Std 488.1-1987 and IEEE Std
488.2-1987.
Output, Video Provides a video signal, non-interlaced, with levels that comply with
ANSI RS343A. Output is through a rear-panel DB9 connector.
Fuse Rating Either of two fuses1 may be used: a .25I 1.25I (UL 198.6, 3AG):
5 A FAST, 250 V, or a 5 mm 20 mm, (IEC 127): 4 A (T), 250 V.
1
Each fuse type requires its own fuse cap.
Table 1-8: Nominal Traits — Mechanical
Name
Description
Cooling Method Forced-air circulation with no air filter.
Construction Material Chassis parts constructed of aluminum alloy; front panel constructed
of plastic laminate; circuit boards constructed of glass-laminate. Plas-
tic parts are polycarbonate.
Finish Type Tektronix Blue textured finish on aluminum cabinet.
Weight Standard digitizing oscilloscope
8.6 kg (19.0 lbs), oscilloscope only.
10.2 kg (22.5 lbs), with front cover, accessories, and accessories
pouch installed.
14.5 kg (32.0 lbs), when packaged for domestic shipment.
Rackmount digitizing oscilloscope
8.2 kg (18.0 lbs) plus the weight of rackmount parts, for the rackmounted digitizing oscilloscope (Option 1R).
16.3 kg (36.0 lbs), when the rackmounted digitizing oscilloscope
is packaged for domestic shipment.
Rackmount conversion kit
4.5 kg (10.0 lbs), parts only; 7.9 kg (17.5 lbs), parts plus package
for domestic shipping.
1Ć10
Specifications
Table 1-8: Nominal Traits — Mechanical (Cont.)
Name Description
Overall Dimensions Standard digitizing oscilloscope
Height 191 mm (7.5 in), when feet and accessories pouch are
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), oscilloscope only; 490 mm (19.28 in),
with optional front cover installed; 564 mm (22.2 in), with
handle fully extended.
Rackmount digitizing oscilloscope
Height 178 mm (7.0 in).
Width 483 mm (19.0 in).
Depth 472 mm (18.6 in), without front-panel handles; 517 mm
(20.35 in), with front-panel handles installed.
Nominal Traits
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć11
Warranted Characteristics
Performance
Conditions
Table 1-9: Warranted Characteristics — Signal Acquisition System
This subsection lists the various
warranted characteristics
that describe the
TDS 400 Digitizing Oscilloscopes. Included are electrical and environmental
characteristics.
Warranted characteristics
limits which are warranted. This subsection lists only
characteristics. A list of
are described in terms of quantifiable performance
warranted
typical characteristics
starts on page 1-18.
NOTE
In these tables, those warranted characteristics that are checked in
the procedure
boldface type under the column
The electrical characteristics found in these tables of warranted characteristics
apply when the oscilloscope is 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 0_C and +50_C (unless
otherwise noted).
Performance Tests
, found in Section 4, appear in
Name.
Name
Accuracy, DC Voltage Measurement,
Averaged
Description
Measurement Type
Average of ≥16 waveforms
DC Accuracy
1.5% |(reading –
1
Net Offset
)| + Offset
Accuracy + 0.06 div)
Delta volts between any two averages of ≥16 waveforms
Accuracy, DC Gain
1
Net Offset = Offset – (Position x 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
DC Gain Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and DC
Voltage Measurement Accuracy (Averaged).
3
.5%
2
1.5% |reading| + 0.1 div +
0.3 mV)
1Ć12
Specifications
Table 1-9: Warranted Characteristics — Signal Acquisition System (Cont.)
Name Description
Warranted Characteristics
Accuracy, Offset Volts/Div Setting
1 mV/div–9.95 mV/div
10 mV/div–99.5 mV/div
100 mV/div–995 mV/div
1 V/div–10 V/div
Accuracy, Position
Analog Bandwidth, DC-50W Coupled
and DC-1 MW
ry Probe Attached
(TDS 410 and TDS 420)
4
with Standard-accesso-
(Position Volts/div) + Offset Accuracy + 0.04 div)
Volts/Div
5 mV/div–10 V/div
2 mV/div–4.98 mV/div
1 mV/div–1.99 mV/div
Analog Bandwidth, DC-50W Coupled
and DC-1 MW with Standard-accessory Probe Attached
(TDS 460)
Volts/Div
5 mV/div–10 V/div
2 mV/div–4.98 mV/div
1 mV/div–1.99 mV/div
Cross Talk (Channel Isolation) Volts/Div
u
500 mV/div
≤9.95 mV/div
10 mV/div–500 mV/div
Offset Accuracy
|Net Offset1|
+ 0.9 mV + 0.1 div)
|Net Offset1|
+1.5 mV + 0.1 div)
|Net Offset1|
+ 15 mV + 0.1 div)
|Net Offset1|
+ 150 mV + 0.1 div)
Bandwidth
5
DC–150 MHz
DC–110 MHz
DC–90 MHz
Bandwidth
5
DC–350 MHz
DC–250 MHz
DC–100 MHz
Isolation
≥40:1 at 50 MHz for any two
channels having equal volts/division settings
≥40:1 at 50 MHz for any two
channels having equal volts/division settings
≥80:1 at 100 MHz and ≥30:1 at
full bandwidth for any two channels having equal volts/division
settings
Delay Between Channels, Full Bandwidth, Equivalent Time
1
Net Offset = Offset – (Position x Volts/Div). Net Offset is the voltage level at the center of the A-D converter’s dynamic range.
Offset Accuracy is the accuracy of this voltage level.
4
Position Accuracy is confirmed in the Performance Verification Procedure (Section 4) by passing the checks for Offset Accuracy
and DC Voltage Measurement Accuracy (Averaged).
5
The limits given are for the ambient temperature range of 0C to +30C. Reduce the upper bandwidth frequencies by 2.5 MHz for
each
C above +30C.
TDS 410, TDS 420 & TDS 460 Technical Reference
≤200 ps between CH 1 and CH 2 (all models) and between CH 3 and
CH 4 (TDS 420 and TDS 460) when both channels have equal volts/
division and coupling settings
≤450 ps for any other combination of two channels with equal volts/division and coupling settings (TDS 420 and TDS 460).
1Ć13
Warranted Characteristics
Table 1-9: Warranted Characteristics — Signal Acquisition System (Cont.)
Name Description
Input Impedance, DC-1 MW Coupled 1 MW pF. Matched between chan-
nels to within
capacitance
Input Impedance, DC-50W Coupled
50
W
with VSWR ≤1.2:1 from DC–150 MHz
(TDS 410 and TDS 420)
Input Impedance, DC-50W Coupled
50
W VSWR ≤1.6:1 from DC–350 MHz
(TDS 460)
Input Voltage, Maximum, DC-1 MW,
AC-1 MW, or GND Coupled
Volt/Div
0.1 V/div–10 V/div
Rating
decade above 10 MHz until the minimum
rating of
reached
1 mV/div–9.99 mV/div
decade above 10 kHz until the minimum
reached
Input Voltage, Maximum, DC-50W or
rating of
5 V rms, with peaks less than or equal to V
AC-50W Coupled
Lower Frequency Limit, AC Coupled ≤10 Hz when AC–1 MW coupled; ≤200 kHz when AC-50W coupled
6
The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X, passive probes are used.
Table 1-10: Warranted Characteristics — Time Base System
Name
Description
dB/
dB/
6
Accuracy, Long Term Sample Rate
50 ppm over any ≥1 ms interval
and Delay Time
Accuracy, Absolute Time and Delay
Time Measurements
1, 2
For single-shot acquisitions using sample or high-resolution acquisition modes and a bandwidth limit setting of 100 MHz:
1 WI + 150 ppm of |Reading| + 450 ps)
For single-shot acquisitions using sample or high-resolution acquisition modes and a bandwidth limit setting of 20 MHz:
1 WI + 150 ppm of |Reading| + 1.3 ns)
For repetitive acquisitions using average acquisition mode with ≥8 averages and a bandwidth limit setting of FULL:
1 WI + 150 ppm of |Reading| + 200 ps)
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 have been acquired at a volts/division setting ≥ 5 mV/division and not in Events mode.
2
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for
Range
and
Equivalent Time or Interpolated Waveform Rates
in Table 1-3 on page 1-8.
Sample Rate
1Ć14
Specifications
Table 1-10: Warranted Characteristics — Time Base System (Cont.)
Name Description
Warranted Characteristics
Accuracy, Delta Time
Measurement
1, 2
For single-shot acquisitions using sample or high-resolution acquisition modes and a bandwidth limit setting of 100 MHz:
1 WI + 150 ppm of |Reading| + 650 ps)
For repetitive acquisitions using average acquisition mode with ≥8 averages and a bandwidth limit setting of FULL:
1 WI + 150 ppm of |Reading| + 300 ps)
1
For input signals ≥ 5 divisions in amplitude and a slew rate of
must have been acquired at a volts/division setting
2
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for
Range
and
Equivalent Time or Interpolated Waveform Rates
≥ 5 mV/division and not in Events mode.
≥ 2.0 divisions/ns at the delta time measurement points. Signal
in Table 1-3 on page 1-8.
Table 1-11: Warranted Characteristics — Triggering System
Name
Accuracy, Trigger Level or Thresh-
old, DC Coupled
Description
Offset1| + 0.2 div volts/div setting + Offset
Accuracy) for any channel as trigger source and for signals having
rise and fall times ≥ 20 ns.
Sensitivity, Edge-Type Trigger, DC
Coupled
2
0.35 division from DC to 50 MHz, increasing to 1 division at 350 MHz
(TDS 410 and TDS 420) or 500 MHz (TDS 460) for any channel as
trigger source
Sample Rate
Sensitivity, Video-Type, TV Field and
TV Line
2
0.6 division of video sync signal
Pulse Width, minimum, Events-Delay 5 ns
Auxiliary Trigger Input Connector: BNC at rear panel
Input Load: equivalent to three TTL gate loads
Input Voltage (maximum): –5 VDC to +10 VDC
Auxiliary Trigger, Maximum Input
Frequency
1
Net Offset = Offset – (Position x 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 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.
10 MHz
Duty Cycle High and low levels must be stable for ≥ 50 ns
TDS 410, TDS 420 & TDS 460 Technical Reference
1Ć15
Warranted Characteristics
Table 1-12: Warranted Characteristics — Probe Compensator Output
Name
Output Voltage and Frequency,
Probe Compensator
Description
Characteristic
Voltage
Frequency
Limits
0.5 V (base-top) 1MW load
1 kHz
T able 1-13: Warranted Characteristics — Power Requirements
Name
Description
Source Voltage and Frequency 90 to 132 VAC rms, continuous range, for 48 Hz through 62 Hz
100 to 132 VAC rms, continuous range, for 48 Hz through 440 Hz
180 to 250 VAC rms, continuous range, for 48 Hz through 440 Hz
Power Consumption ≤240 Watts (370 VA)
1Ć16
Specifications
Warranted Characteristics
Table 1-14: Warranted Characteristics — Environmental, Safety, and Reliability
Name
Description
Atmospherics Temperature:
0_ C to +50_ C, operating;
–40_ C to +75_ C, non-operating
Relative humidity:
0 to 95%, at or below +30_ C; 0 to 75%, +31_ C to +50_ C
Altitude:
To 15,000 ft. (4570 m), operating;
to 40,000 ft. (12190 m), non-operating
Emissions
1,2
Meets or exceeds the requirements of the following standards:
Vfg. 243/1991 Amended per Vfg 46/1992
FCC 47 CFR, Part 15, Subpart B, Class A
EN50081-1 European Community Requirements
EN55022 Radiated Emissions Class B
EN55022 Conducted Emissions Class B
Susceptibility Meets or exceeds the requirements of the following standards:
EN50082-1 European Community Requirements
IEC 801-3 Radiated Susceptibility 3 V/meter from 27 MHz to
500 MHz unmodulated.
Performance Criteria: < + 0.2 division waveform
displacement, or < 0.2 division increase in p-p noise
when the oscilloscope is subjected to the EMI
specified in the standard.
IEC 801-2 Electrostatic Discharge, Performance Criteria B
Dynamics Random vibration3:
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
1
To maintain emission requirements when connecting to the IEEE 488 GPIB interface of this oscilloscope, use only a high-quality,
double-shielded (braid and foil) GPIB cable. The cable shield must have low impedance connections to both connector housings.
Acceptable cables are Tektronix part numbers 012-0991-00, -01, -02, and -03.
2
To maintain emission requirements when connecting to the VGA-compatible video output of this oscilloscope, use only a high-quality
double-shielded (braid and foil) video cable with ferrite cores at either end. The cable shield must have low impedance connections to
both connector housings. An acceptable cable is NEC
monitor connection is needed.)
3
Does not apply to rackmounted instrument
TDS 410, TDS 420 & TDS 460 Technical Reference
R
part number 73893013. (Use an appropriate adapter when other than a 9-pin
1Ć17
Typical Characteristics
This subsection contains tables that list the various
describe the TDS 400 Digitizing Oscilloscopes.
Typical characteristics
performance. Typical characteristics
This subsection lists only
istics starts on page 1-12.
Table 1-15: Typical Characteristics — Signal Acquisition System
Name
Accuracy, DC Voltage Measurement,
Not Averaged
Frequency Limit, Upper, 100 MHz Band-
width Limited
Frequency Limit, Upper, 20 MHz
Bandwidth Limited
are described in terms of typical or average
typical characteristics. A list of warranted character-
Description
Measurement Type
Any Sample
Delta Volts between any two
samples
2
100 MHz
20 MHz
typical characteristics
are not warranted.
DC Accuracy
1.5% (|reading – Net
1|
Offset
+ 0.13 div + 0.6 mV)
1.5% |reading| + 0.26 div
+ 1.2 mV)
that
) + Offset Accuracy
Nonlinearity
t
1 DL, differential; ≤ 1 DL, integral, independently based
Step Response Settling Error Volts/Div Setting Step
Settling Error (%)
3
4
Amplitude
1 mV/div–99.5 mV/div
100 mV/div–
≤2 V
≤20 V
20 ns
≤0.5
≤2.0
500 ns
≤0.2
≤0.5
20 ms
≤0.1
≤0.2
995 mV/div
1 V/div–10 V/div
1
Net Offset = Offset – (Position x 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
A DL (digitization level) is the smallest voltage level change that can be resolved by the 8-bit A-D Converter, 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.
4
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.
≤200 V
≤2.0
≤0.5
≤0.2
1Ć18
Specifications
Table 1-16: Typical Characteristics — Time Base System
T ypical Characteristics
Name
Description
Aperture Uncertainty For real-time or interpolated records having duration ≤1 minute:
≤(50 ps + 0.03 ppm Record Duration) RMS
For equivalent time records:
≤(50 ps + 0.06 ppm WI
1
) RMS
Fixed Error in Sample Time ≤50 ps
1
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for
Range
and
Equivalent Time or Interpolated Waveform Rates
in Table 1-3 on page 1-8.
Sample Rate
Table 1-17: Typical Characteristics — Triggering System
Name
Error, Trigger Position, Edge Triggering Acquire Mode
Holdoff, Variable, Main Trigger
Description
Sample, Hi-Res, Average
Peak Detect, Envelope
Main Horizontal Scale
≤100 ns/div
≥100 ms/div
Otherwise
Minimum
Holdoff
1 ms
1 s
10
sec/div
Trigger-Position Error
ns)
ns)
Maximum Holdoff
5 Min Holdoff
5 Min Holdoff
5 Min Holdoff
1,2
Lowest Frequency for Successful Op-
20 Hz
eration of “Set Level to 50%” Function
Sensitivity, Edge Trigger, Not DC
Coupled
3
Trigger Coupling
AC
Typical Signal Level for Stable Triggering
Same as DC-coupled limits
4
for frequen-
cies above 60 Hz. Attenuates signals
below 60 Hz.
Noise Reject
High Frequency Reject
Three and one-half times the DC-coupled
4
limits.
One and one-half times the DC-coupled
4
from DC to 30 kHz. Attenuates
limits
signals above 30 kHz.
Low Frequency Reject
One and one-half times the DC-coupled
4
limits
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
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
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
division/ns.
and
Equivalent Time or Interpolated Waveform Rates
Sensitivity, Edge-Type Trigger, DC Coupled
in Table 1-3 on page 1-8.
in Table 1-11, which begins on page 1-15.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć19
T ypical Characteristics
Table 1-17: Typical Characteristics — Triggering System (Cont.)
Name Description
Frequency, Maximum for Events Delay590 MHz
Width, Minimum Pulse and Rearm,
Events Delay
6
Video Mode (Option 05 Equipped Instruments Only)
5 ns
Line Rate Class: Four classes are provided as follows.
H
NTSC, which provides a default line rate compatible with the
NTSC standard (525/60)
H
PAL, which provides a default line rate compatible with the PAL
standard (625/50)
H
SECAM, which provides a default line rate compatible with the
SECAM standard (625/50)
H
Custom, which provides user selectable line rate ranges (see
“Custom Line Rate Ranges” below)
Custom Line Rate Ranges: 15 kHz–20 kHz, 20 kHz–25 kHz,
25 kHz–35 kHz, and 35 kHz–64 kHz
Holdoff: Automatically adjusts to 50 ms (nominal) for NTSC class;
to 140 ms (nominal) for PAL and SECAM
Triggerable on Field Selections: Odd, Even, or Both
Delayed Acquisition: Settable for delay by line number or runs after
time delay
5
The maximum frequency for a delaying events input.
6
The minimum pulse width and rearm width required for recognizing a delaying event.
Table 1-18: Typical Characteristics — Data Handling
Name
Time, Data-Retention, Nonvolatile
Memory
1,2
Description
Internal batteries, installed at time of manufacture, have a life of
≥5 years when operated and/or stored at an ambient temperature
from 0_ C to 50_ C. Retention time of the nonvolatile memories is
equal to the remaining life of the batteries.
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 lithium poly-carbon monofluoride.
1Ć20
Specifications
Operating Information
Installation
This section contains information about supplying operating power, the operating environment, applying and interrupting power, repackaging for shipment,
and installed options.
Supplying Operating
Power
Read all information and heed all warnings in this section before
connecting the digitizing oscilloscope to a power source.
WARNING
AC POWER SOURCE AND CONNECTION. The digitizing
oscilloscope operates from a single-phase power source. It has a
three-wire power cord and a two-pole three-terminal grounding type
plug. The voltage to ground (earth) from either pole of the power
source must not exceed the 250 V rms maximum rated operating
voltage.
Before making connection to the power source, be sure the
digitizing oscilloscope has a suitable two-pole three-terminal
grounding-type plug.
GROUNDING. This instrument is safety Class 1 equipment (IEC
designation). All accessible conductive parts are directly connected
through the grounding conductor of the power cord to the grounded
(earthing) contact of the power plug.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
WARNING
The power input plug must be inserted only in a mating receptacle
with a grounding contact where earth ground has been verified by a
qualified service person. Do not defeat the grounding connection.
Any interruption of the grounding connection can create an electric
shock hazard.
For electric shock protection, the grounding connection must be
made before making connection to the oscilloscope input or output
terminals.
2Ć1
Installation
Power Cord Information
A power cord with appropriate plug configuration is supplied with each
digitizing oscilloscope. Table 2-1 gives the color coding of the conductors in
the power cord. If you require a power cord other than the one supplied, refer
to Figure 2-1.
Table 2-1: Power Cord Conductor Identification
Conductor
Ungrounded (Line) Brown Black
Grounded (Neutral) Light Blue White
Grounded (Earthing) Green/Yellow Green
Color Alternate Color
Operating Voltage
The line voltage ranges and their associated line frequency ranges over which
this oscilloscope operates are listed in Section 1
Voltage and Frequency
on page 1-16 for those ranges.
Specification.
CAUTION
Before stepping the source line voltage from one range to a higher
range, set the principal power switch (rear panel) to its OFF position. Failure to do so can damage the oscilloscope.
There are two fuses. Either fuse may be used throughout the line voltage and
frequency ranges. These two fuses are not totally interchangeable as each
requires a different fuse cap. The fuses and their caps are listed by part
number in Section 10,
Mechanical Parts List.
See
Source
2Ć2
Memory Backup Power
Replaceable lithium batteries maintain internal memory modules to allow the
digitizing oscilloscope to retain the following data upon loss of the AC power
source: stored adjustment constants, saved front-panel settings, current
front-panel settings (instrument status), and saved waveforms.
These batteries have a shelf life of about five years. Partial or total loss of
stored settings upon power-up may indicate that you need to replace the
batteries.
Operating Information
Installation
Standard*
North
American
115V
Option A3
Australian
230V
Option A1
Universal Euro
230V
Option A4*
North
American
230V
* Canadian Standards Association certification
includes these power plugs for use in the
North American power network
Figure 2-1: Power-Cord Plug Identification
Option A2
UK
230V
Option A5
Switzerland
230V
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
2Ć3
Installation
Operating
Environment
The following environmental requirements are provided to ensure proper
operation and long oscilloscope life.
Operating Temperature
Operate the oscilloscope where the ambient air temperature is between 0_ C
and +50_ C, and store the oscilloscope at an ambient temperature from
–40_ C to +75_ C. After storage at temperatures outside the operating limits,
allow the chassis to stabilize at a safe operating temperature before applying
power.
Ventilation Requirements
The digitizing oscilloscope is cooled by air drawn in and exhausted through its
cabinet side panels by an internal fan. To ensure proper cooling of the
oscilloscope, allow at least two inches clearance on both sides and
the bottom of the digitizing oscilloscope. (The feet on the bottom of the
oscilloscope provide the required clearance when set on flat surfaces.) The
top of the oscilloscope does not require ventilation clearance.
CAUTION
on
Applying and
Interrupting Power
If air flow is restricted, the power supply of the digitizing
oscilloscope may temporarily shut down.
Consider the following information when you power up or power down the
oscilloscope, or when power is interrupted due to an external power failure.
Power-Up
Upon power-up, the oscilloscope runs its power-on self check. If the self
check passes, the oscilloscope displays a “passed” status message and a
prompt to press CLEAR MENU to continue. If the self check fails, the oscilloscope displays a diagnostic log that identifies the area(s) that failed and a
prompt to press CLEAR MENU to continue. See Section 6,
information on diagnostics and fault isolation.
Maintenance
, for
2Ć4
Operating Information
Installation
Power-Down
CAUTION
DO NOT power down the oscilloscope when either running a signal
path compensation or when doing any of the adjustments described
in Section 5,
Adjustment Procedures.
loss of internally stored adjustment constants.
In general, do not power down the oscilloscope when doing operations that
affect the data types listed in Table 2-2. Wait for the oscilloscope to finish the
operation when doing adjustments, saving waveforms, or saving setups. After
operations complete, wait at least four more seconds before turning the
power off.
Improper power-down or unexpected loss of power to the oscilloscope can
result in corruption of non-volatile RAM (NVRAM). The following table
describes the messages displayed when power is restored after an abnormal
power-down.
To do so might result in the
Table 2-2: Effects of Corrupted Data
Corrupted Data Type
Results
Adjustment Constants:
H
Signal Path Compensation A signal path compensation is required.
H
Voltage Reference A voltage reference adjustment is re-
quired (Section 5).
H
Low or High Frequency
Response
H
Trigger Skew A trigger skew adjustment is required
Error Log
Reference Waveforms
Saved Setups
A frequency response adjustment is required (Section 5).
(Section 5).
Errors logged are lost.
Waveforms Lost.
Setups Lost.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
2Ć5
Installation
Repackaging
Instructions
Installed Options
Use a corrugated cardboard shipping carton having a test strength of at least
275 pounds and with an inside dimension at least six inches greater than the
oscilloscope dimensions. (If available, use the original shipping carton, which
meets these requirements.)
If the instrument is being shipped to a Tektronix Service Center, enclose the
following information: the owner’s address, the name and phone number of a
contact person, the type and serial number of the oscilloscope, the reason for
returning, and a complete description of the service required.
Seal the shipping carton with an industrial stapler or strapping tape.
Mark the address of the Tektronix Service Center and also your own return
address on the shipping carton in two prominent locations.
Your oscilloscope may be equipped with one or more options. Except for the
line-cord options described by Table 2-1 (on page 2-3 of this section), all
options and optional accessories are listed and described in Section 7,
Options
Tektronix Products catalog or contact your Tektronix Field Office.
. For further information and prices of oscilloscope options, see your
2Ć6
Operating Information
Operating Information
Before doing service, read the following operating instructions. These instructions are at the level appropriate for servicing this digitizing oscilloscope. The
complete operators instructions are found in the user manual.
Additional instructions are integrated into the service procedures found in later
sections of this manual. For instance, the procedures found in the section
Performance Verification
settings required to check each oscilloscope characteristic included there.
Also, the general instructions for operating the internal diagnostic routines are
found in Section 6,
Section 1 useful for understanding how the oscilloscope functions.
contain instructions for making the front-panel
Maintenance.
You may also find the
Product Description
in
Screen Layout
Basic Procedures
The screen layout is illustrated in Figure 2-2 on page 2-8. Note that the
figure illustrates a full graticule; you may also select a grid, crosshair, or frame
graticule from the display menu.
How to Power Up
Push the principal power switch found on the rear panel of the digitizing
oscilloscope, then push the ON/STBY (standby) switch to toggle the digitizing
oscilloscope into operation. The switch at the rear panel is the true power
disconnect switch. The ON/STBY(standby) switch simply toggles operation
on and off.
WARNING
The principal power switch at the rear panel is the true power
disconnect switch. The
operation on and off. When connected to a power source and when
the principal power switch is on, the some power supply circuitry in
this digitizing oscilloscope is energized regardless of the setting of
ON/STBY
the
switch.
ON/STBY
(standby) switch simply toggles
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
When connecting or disconnecting the line cord to or from the
power source, the principal power switch should be off.
2Ć7
Operating Information
Position of waveform
record relative to
the screen and display.
Waveform reference
symbols: ground levels
and waveform sources.
Graticule and waveforms.
Vertical scale,
horizontal scale, and
trigger level readouts.
Brief status
information.
General purpose
knob readout.
Side menu area.
Readouts for
measurements
move here when
CLEAR MENU is
pressed.
Main menu display area. Readouts in
lower graticule area move here when
CLEAR MENU is pressed.
Figure 2-2: Map of Display Functions
How to Use Help
Push the HELP front-panel button to enter help mode. Front-panel knobs and
buttons now display information about their function when turned or pushed.
Push HELP again to exit help mode.
To get help information on a menu item, display the menu desired (if you are
in help mode, exit help first). Push HELP. Now the menu buttons display
information about their function when pushed.
How to Use the Status Menu
Push the SHIFT button, and then press the STATUS front-panel button to
display the status menu. The messages reflect the state of the acquisition
system, whether it is running or stopped (and if it is stopped, why), as well as
setup-related information.
2Ć8
Operating Information
Operating Information
How to Set Functions
Most functions are set either by using one or two front-panel buttons or
knobs, or by pushing a front-panel button to use a main menu, and then a
side menu to set the function. The following steps illustrate both procedures.
1. Locate the block that contains the function to be set.
Vertical Controls and
Special Controls Block: Accesses
all functions except those in the
remaining three control blocks.
Inputs Block
Horizontal Controls Block
Trigger Controls Block
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
2Ć9
Operating Information
2. Select the waveform source(s). Position, scale, and set trigger level for
waveform source(s) directly from the front-panel. (Note that parenthesesenclosed numbers appear within the following steps. Each number refers
to the control(s) labeled with the same number in the figure that precedes
the step.)
12
3
4
5
8
7
a. Input waveforms into these channels (7). Example: CH 1.
b. Push any channel button (8) to display its waveform. The last channel
selected determines which waveform is positioned and scaled. The
indicator above the channel last selected is lighted. Example: Push
CH 1; then CH 2.
c. Vertically (1) and horizontally (2) scale and position the waveform(s)
selected. Example: Set the scale to 100 mV/div, and center the
waveform on screen.
d. Stop and start acquiring waveforms (3). Example: Push RUN/STOP if
not acquiring.
e. Adjust trigger level (5) to trigger the waveform(s) selected, or use
these buttons (6) to either set a trigger level at the mid-amplitude
level of the selected waveform or to force a single trigger. Example:
Push SET LEVEL TO 50%.
6
2Ć10
Operating Information
Operating Information
3. Set all other functions using menus.
a. Choose the waveform source (8) first if setting a vertical function;
else skip to step b. Example: Push CH 2.
b. Push SHIFT (4) if the function to be set is highlighted in blue; else
skip to step c.
9
10
11
14
13
12
c. Push the front-panel button that corresponds to the menu containing
the function. A main menu (14) for selecting among related functions
appears. Example: Push VERTICAL MENU.
Note the two labels: the top label is a function to choose from; the
bottom label tells you the current setting for that function. Offset is
–1.4 V
currently set to
.
d. Select a function from the main menu using the main menu but-
tons (12). A side menu for selecting among the available settings for
that function appears. Example: Push Coupling (13).
e. Select the setting for the function from the side menu (9) using the
side menu buttons (11). Example: Push AC (10).
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
2Ć11
Operating Information
How to Set Complex Functions
A few functions require more than just two levels (main and side) of menus to
completely specify their settings. In such cases, either the main menu, the
side menu, or both are modified to supply additional choices. The procedures
that follow show both schemes.
1. Set up a function using pop-up menus:
15
18
17
16
a. For some selections, pushing a main menu button pops up a menu
(18) of subfunctions. Example: Push SHIFT; then push UTILITY. Now
push System (17).
Note the pop-up menu for System is set to I/O (input/output). All the
main menu buttons to the right of the pop-up menu are labeled with
subfunctions of I/O.
b. Pushing the button that popped up the menu (17) toggles through the
pop-up menu choices. Example: Repeatedly push System to toggle
through the pop-up menu. Notice the other main-menu button labels
change accordingly. Toggle back to I/O.
c. Complete the setting of the desired mode by selecting from the main
menu and the side menu that results. Example: Push Configure (16),
and then push Hardcopy (Talk only) (15).
2Ć12
Operating Information
Operating Information
2. Set up a function using the general purpose knob (20). (The examples of
possible menu selections in the substeps that follow assume you have
pushed TRIGGER MENU.)
2019
21
a. Pushing some main menu buttons displays a side menu with labels
containing readouts that you can vary. Example: Push Level (21).
b. Pushing the side-menu button assigns the knob to control the readout
appearing in the button label. It also copies the readout to the general
purpose knob readout area in the right corner of the screen. Example:
Push Level (19).
c. Use the general purpose knob (20) to adjust the trigger level to the
setting desired. Example: Turn the knob to –20 mV.
More About the General Purpose Knob — As you have just seen, the
general purpose knob is used to extend the number of choices available to a
side menu button. The general purpose knob can also be assigned to control
the following functions:
H
Cursor positioning
H
Display intensities
H
Delay time
H
Number of events
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
H
Trigger position
2Ć13
Operating Information
H
Holdoff
H
Offset
H
Variable persistence
In all cases, the menus are used to select the function to which the general
purpose knob is assigned. The following attributes apply to this knob:
H
Depending on the function it is assigned to control, the general purpose
knob varies numerical readouts, positions objects (cursors) on screen, or
selects between icon-label settings that show up in side-menu labels.
H
The general purpose knob has a readout area at the upper-right corner of
the screen. (See Figure 2-2.) This readout always reflects the name and
value of the function that the general purpose knob is currently controlling.
H
The general purpose knob is affected by the SHIFT button. Pressing shift
toggles the knob between its fine and coarse modes. Fine mode is used
for most adjustments; coarse mode is used to traverse large parts of the
adjustment range in less time.
H
Whenever the general purpose knob assignment is changed, a knob icon
appears immediately to the left of the general purpose knob readout to
notify you of the assignment change. The icon is removed as soon as you
use the general purpose knob to change the value of the function it is
assigned to.
H
To assign the general purpose knob to control a function, display the
menu containing the function; then select the function. (Note that not all
functions can be controlled by the general purpose knob.)
H
Whenever the menu is removed, the general purpose knob is not assigned and does not control a function. (An exception is the cursor function. If cursors are turned on, removing the menu leaves the knob
assigned to control the cursors until reassigned by selecting another
menu and function that uses the knob.)
H
The general purpose knob also has a TOGGLE button. The toggle button
is used to toggle the knob between the control of either of the two cursors
displayed when H-bar or V-bar cursors are turned on in the cursor menu.
2Ć14
Operating Information
Operating Information
Display and Utility Menus — Using the techniques described for using
menus, you can access and change functions in the display menu and utilities
menu. In the Display menu, you can set the following functions:
H
Intensity: waveforms, readouts, graticule, etc.
H
Style of waveform display(s): vectors or dots, intensified or non-intensified
samples, and infinite or variable persistence.
H
Display format: XY or YT.
H
Graticule format: full, grid, crosshair, and frame.
H
Waveform interpolation filter and readout options.
From the Utility menu, you can configure the GPIB port (talk/listen, address,
etc.) and access internal routines for self diagnostics and self compensation.
Instructions for setting up communication over the GPIB are found in Sec-
Adjustment Procedures
tion 5,
.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
2Ć15
Operating Information
2Ć16
Operating Information
Theory of Operation
Circuit Description
This section describes the electrical operation of the Tektronix TDS 410,
TDS 420, & TDS 460 Digitizing Oscilloscopes using the major circuit blocks or
modules.
This section has two main parts:
H
Logic Conventions describes how logic functions are discused and
represented in this manual.
H
Module Overview describes circuit operation from a functional-circuit
block perspective.
Logic Conventions
Module Overview
The digitizing oscilloscope contains many digital logic circuits. This manual
refers to these circuits with standard logic symbols and terms. Unless otherwise stated, all logic functions are described using the positive-logic convention: the more positive of the two logic levels is the high (1) state, and the
more negative level is the low (0) state. Signal states may also be described
as “true” meaning their active state or “false” meaning their non-active state.
The specific voltages that constitute a high or low state vary among the
electronic devices.
Active-low signals are indicated by a tilde prefixed to the signal name (~RESET). Signal names are either active-high, active-low, or have both activehigh and active-low states.
This module overview describes the basic operation of each functional circuit
block as shown in Figure 9-2.
General
The digitizing oscilloscope is a portable, multichannel instrument. Each channel provides a calibrated vertical scale factor. All channels can be acquired
simultaneously.
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
Input Signal Path
A signal enters the oscilloscope through a probe connected to a BNC on the
A05 Attenuator board.
3Ć1
Circuit Description
Attenuators — Circuitry in the attenuator selects the input coupling, the
termination, and the attenuation factor. The processor system controls the
attenuators. For example, if 50W input termination is selected and the input is
overloaded, the processor system switches the input to the 1 MW position.
The preamplifier in the A05 Attenuator amplifies the input signals.
Probe Coding Interface — Probe coding interface signals pass through
the A06 Front Panel to the processor system which in turn controls the
A05 Attenuator and the A04 Acquisition boards.
Jumper — Signals from the attenuators pass through the A08 Jumper board
to the acquisition system.
Acquisition System — The acquisition system converts the input signals
to digital signals and controls the acquisition process under direction of the
processor system. The acquisition system includes the trigger, acquisition
timing, and acquisition mode generation and control circuitry.
D1 Bus — The acquisition system passes the digital values representing the
acquired waveform through the D1 bus to the A09 DSP board (TriStar). This
happens after a waveform acquisition is complete if the digital signal processor (DSP) requests the waveform.
Processor System — The processor system consists of a 68020 micro-
processor that controls the entire instrument. It includes the firmware program
for the oscilloscope. The firmware can be reprogrammed by using the GPIB
and an external software package. The processor system also includes a
GPIB interface.
DSP — The digital signal processor processes each waveform as directed by
software downloaded from the system processor. Waveforms and any text to
be displayed are passed on to the A02 Display board.
Display — Text and waveforms are processed by different parts of the
A02 Display circuitry. The display sends the text and waveform information to
the A26 Monitor assembly as a video signal. The display circuitry also generates and sends vertical (VSYNC) and horizontal (HSYNC) sync signals to the
A26 Monitor assembly. A VGA-compatible video output is available at the rear
of the instrument.
Monitor Assembly
All information (waveforms, text, graticules, and pictographs) is displayed by
the A20 CRT Driver. The driver generates the high voltages necessary to
drive the CRT. It also contains the video amplifier, horizontal oscillator, and
the vertical and horizontal yoke driver circuitry. The monitor gets its supply
voltages from the A25 Low Voltage Power Supply through the A01 Backplane
and the A07 Auxiliary Power boards.
3Ć2
Theory of Operation
Circuit Description
Front Panel
The processor system sends instructions to and receives information from the
Front Panel Processor on the A06 Front Panel board. The Front Panel Processor reads the front-panel switches and pots. Any changes in their settings
are reported to the processor system. The Front Panel Processor also turns
the LEDs on and off, generates the bell signal, and generates the probe
compensation signal PROBE ADJ. The Front Panel Processor also processes the probe coding interface signals.
Menu Switches — Front-panel menu switches are also read by the Front
Panel Processor. The processor sends any changes in menu selections to the
processor system.
ON/STBY Switch — This switch is not read by the Front Panel Processor.
The signal passes through the A06 Front Panel board, the A03 CPU board,
and the A01 Backplane board to the low voltage power supply.
Rear Panel
The GPIB connector provides access to stored waveforms and allows external control of the oscilloscope. Other connectors accessible from the rear
panel are the AUX TRIGGER and VIDEO.
Aux Power
The A07 Auxiliary Power circuitry includes the principal power switch, fuse,
line trigger transformer, and line filter. It also distributes power to the monitor
and fan.
Low Voltage Power Supply
The low voltage power supply is a switching power converter. It supplies
power to all oscilloscope circuitry. The low voltage power supply sends all of
its power to the A01 Backplane where it is distributed to all other circuitry.
The principal POWER switch, located on the rear panel, controls all power to
the oscilloscope including the low voltage power supply. The ON/STBY
switch, located on the front panel, also controls all of the power to the oscilloscope except for part of the circuitry in the low voltage power supply.
Fan
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
The fan provides forced air cooling for the oscilloscope. It connects to +12 V
on the A01 Backplane through the A07 Auxiliary Power board.
3Ć3
Circuit Description
3Ć4
Theory of Operation
Performance Verification
Brief Procedures
The
Self Tests
adjustment. No test equipment is required to do these test procedures.
use internal routines to confirm basic functionality and proper
General Instructions
Functional Tests
The
test-signal source for further verifying that the oscilloscope functions properly.
A standard-accessory probe, included with this oscilloscope, is the only
equipment required.
These procedures verify the TDS 400 Digitizing Oscilloscopes.
Besides the
oscilloscope performance includes the
section. You may not need to perform all of these procedures, depending on
what you want to accomplish:
H
To rapidly confirm that this oscilloscope functions and is adjusted properly, just do the procedures under
Advantages: These procedures are quick to do, require no external
equipment or signal sources, and perform extensive functional and accuracy testing to provide high confidence that the oscilloscope will perform
properly. Use these procedures as a quick check before making a series
of important measurements.
H
To further check functionality, first do the
do the procedures under
Brief Procedures,
utilize the probe-adjust output at the front panel as a
the set of procedures that can be used to verify
Performance Tests
Self Tests
Functional Tests
, which begin on page 4-4.
Self Tests
that begin on page 4-6.
found later in this
just mentioned; then
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. Use these procedures to quickly determine if the oscilloscope is
suitable for putting into service, such as when it is first received.
H
If more extensive confirmation of performance is desired, do the
mance Tests
Tests
just referenced.
Advantages: These procedures add direct checking of warranted specifications. They require more time to perform and suitable test equipment is
required. (See
If you are not familiar with operating this oscilloscope, read
Instructions
with the use of the front-panel controls and the menu system.
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
, beginning on page 4-13, after doing the
Equipment Required
in Section 3 of this manual. These instructions will acquaint you
on page 4-13.)
Perfor-
Functional
General Operating
and
Self
4Ć1
Brief Procedures
Conventions
Throughout these procedures the following conventions apply:
H
Each test procedure uses the following general format:
Title of Test
Equipment Required
Prerequisites
Procedure
H
Each procedure consists of as many steps, substeps, and subparts as
required to do the test. Steps, substeps, and subparts are sequenced as
follows:
1. First Step
a. First Substep
H
First Subpart
H
Second Subpart
b. Second Substep
2. Second Step
H
In steps and substeps, the lead-in statement in italics instructs you what
to do, while the instructions that follow tell you how to do it: in the example step below,
SETUP. Now, press the main-menu button... .”
“Initialize the oscilloscope”
by doing “Press save/recall
Initialize the oscilloscope:
main-menu button Recall Factory Setup; then the side-menu button
OK Confirm Factory Init.
H
Where instructed to use a front-panel button or knob, or 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: “press SHIFT; then AC-
QUIRE MENU,” “press the main-menu button Coupling,” or “verify that
the status message is
The symbol at the left is accompanied by information you must read
to do the procedure properly.
Pass
Press save/recall SETUP. Now, press the
.”
4Ć2
Performance Verification
Brief Procedures
H
Refer to Figure 4-1: “Main menu” refers to the menu that labels the seven
menu buttons under the display; “side menu” refers to the menu that
labels the five buttons to the right of the display.
Position of waveform
record relative to
the screen and display.
Waveform reference
symbols: ground levels
and waveform sources.
Graticule and waveforms.
Vertical scale,
horizontal scale, and
trigger-level readouts.
Brief status
information.
General purpose
knob readout.
Side menu area.
Readouts for
measurements
move here when
CLEAR MENU is
pressed.
Main menu display area. Readouts in
lower graticule area move here when
CLEAR MENU is pressed.
Figure 4-1: Map of Display Functions
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
4Ć3
Brief Procedures
Self Tests
This procedure uses internal routines to verify that this 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.
Verify Internal Adjustment, Self Compensation, and
Diagnostics
Equipment Required: None.
Prerequisites:
warm-up before doing this procedure.
Procedure:
Verify that internal diagnostics pass:
1.
that the internal diagnostics passed.
Display the system diagnostics menu:
a.
H
H
H
Power on the digitizing oscilloscope and allow a 20 minute
Do the following substeps to verify
Press SHIFT; then press UTILITY.
Repeatedly press the main-menu button System until Diag/Err is
highlighted in the menu that pops up.
Repeatedly press the main-menu button Area until All is high-
lighted in the menu that pops up.
Run the system diagnostics:
b.
then press the side-menu button OK Confirm Run Test.
Wait:
c.
d.
e.
The internal diagnostics do an exhaustive verification of proper
oscilloscope function. This verification takes up to a minute. While it
progresses, a variety of test patterns flash on screen. When finished,
the resulting status appears on the screen.
Confirm no failures are found:
reported on-screen.
Confirm the four adjustment sections have passed status:
H
Press SHIFT; then press UTILITY.
H
Press the main menu button System until Cal is highlighted in
the pop-up menu.
H
Verify that the word
following menu labels: Voltage Reference, High Frequency
Response, Low Frequency Response, and Trigger Skew.
(See Figure 4-2.)
Press the main-menu button Execute;
Verify that no failures are found and
Pass
appears in the main menu under the
4Ć4
Performance Verification
First, display the CAL menu.
Second, verify Pass
status for the
adjustment
sections.
Third, run a signal
path compensation
and verify status is
Pass.
Brief Procedures
Figure 4-2: Verifying Adjustments and Signal Path Compensation
This oscilloscope lets you compensate the internal signal path used to acquire
the waveforms you acquire and measure. By executing the signal path compensation feature (SPC), you optimize the oscilloscope capability to make
accurate measurements based on the ambient temperature.
must
You
run an SPC anytime you wish to ensure that the measurements you
make are made with the most accuracy possible. You should also run an SPC
if the temperature has changed more than 5_C since the last SPC was performed.
Run the signal path compensation:
f.
Disconnect all input signals. Press
the main-menu button Signal Path; then press the side-menu button
OK Compensate Signal Paths.
NOTE
Failure to run the signal path compensation may result in the oscilloscope not meeting warranted performance levels.
g.
Wait:
signal path compensation runs in one to three minutes. While it
progresses, a “clock” icon (shown at left) displays on-screen. When
compensation completes, the status message updates to
in the main menu (see step h).
Pass
or
Fail
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
Confirm signal path compensation returns passed status:
h.
word
Pass
appears under Signal Path in the main menu. (See
Figure 4-2.)
Verify the
4Ć5
Brief Procedures
2.
Return to regular service:
nus.
Press CLEAR MENU to exit the system me-
Functional Tests
The purpose of these procedures is to confirm that this oscilloscope functions
properly. The only equipment required is one of the standard-accessory
probes.
These procedures verify functions; that is, they verify that oscilloscope features
limits.
Therefore, when the instructions in the functional tests 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,” etc., do
within limits is checked in
page 4-13.
DO NOT make changes to the front-panel settings that are not called
out in the procedures. Each verification procedure will require you to
set the oscilloscope to certain default settings before verifying functions. 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.
When you are instructed to press a menu button, the button may
already be selected (its label will be highlighted). If this is the case, it
is not necessary to press the button.
operate
NOT
. They do
interpret the quantities given as limits. Operation
Performance Tests
not
verify that they operate within
, which begin on
Verify All Input Channels
Equipment Required: One P6138 probe.
Prerequisites:
Procedure:
Install the test hookup and preset the oscilloscope controls:
1.
None.
4Ć6
Performance Verification
Brief Procedures
Figure 4-3: Universal Test Hookup for Functional Tests
Hook up the signal source:
a.
probe tip to PROBE ADJ on the front panel; leave the probe ground
unconnected.
Initialize the oscilloscope:
b.
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
Verify that all input channels operate:
2.
CH 1 first,
skipping substep a since CH 1 is already set up for verification
from step 1.
a.
Select an unverified channel:
H
Press WAVEFORM OFF to remove from display the channel just
verified.
H
Press the front-panel button that corresponds to the channel you
are to verify.
H
Move the probe to the channel you selected.
Set up the selected channel:
b.
Install the probe on CH 1. Connect the
Do the following substeps—test
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
H
Press AUTOSET to obtain a viewable, triggered display in the
selected channel.
H
Set the vertical SCALE to 100 mV. Use the vertical POSITION
knob to center the waveform vertically on screen.
H
Set the horizontal SCALE to 200 ms.
H
Press TRIGGER MENU.
H
Press the main-menu button Coupling; then press the side
menu-button HF Rej.
4Ć7
Brief Procedures
c.
Verify that the channel is operational:
statements are true.
H
The vertical scale readout for the channel under test shows a
setting of 100 mV, and a square-wave probe-compensation signal
about five divisions in amplitude is on-screen. (See Figure 4-1 on
page 4-3 to locate the readout.)
H
The vertical POSITION knob moves the signal up and down the
screen when rotated.
H
Turning the vertical SCALE knob counterclockwise decreases the
amplitude of the waveform on-screen, turning the knob clockwise
increases the amplitude, and returning the knob to 100 mV
returns the amplitude to about five divisions.
Confirm that the following
Verify that the channel acquires in all acquisition modes:
d.
SHIFT; then press ACQUIRE MENU. Use the side menu to select, in
turn, each of the five hardware acquire modes and confirm that the
following statements are true. Refer to the icons at the left of each
statement as you confirm those statements.
H
Sample mode displays an actively acquiring waveform onscreen. (Note that there is noise present on the peaks of the
square wave.)
H
Peak Detect mode displays an actively acquiring waveform
on-screen with the noise present in Sample mode “peak detected.”
H
Hi Res mode displays an actively acquiring waveform on-screen
with the noise that was present in Sample mode reduced.
H
Envelope mode displays an actively acquiring waveform onscreen with the noise displayed.
H
Average mode displays an actively acquiring waveform onscreen with the noise reduced like in Hi Res mode.
Test all channels:
e.
are verified.
Remove the test hookup:
3.
and the probe-adjust terminal.
Press
Repeat substeps a through d until all input channels
Disconnect the probe from the channel input
4Ć8
Verify the Time Base
Equipment Required: One P6138 probe.
Prerequisites:
Procedure:
Install the test hookup and preset the oscilloscope controls:
1.
a.
Hook up the signal source:
probe tip to PROBE ADJ on the front panel; leave the probe ground
unconnected. (See Figure 4-3 on page 4-7.)
None.
Install the probe on CH 1. Connect the
Performance Verification
b.
Initialize the oscilloscope:
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup; then press
the side-menu button OK Confirm Factory Init.
Modify default settings:
c.
H
Press AUTOSET to obtain a viewable, triggered display.
H
Set the horizontal SCALE to 200 ms.
H
Press VERTICAL MENU.
H
Press the main-menu button Bandwidth. Then press the sidemenu button 20 MHz.
H
Press CLEAR MENU to remove the vertical menu from the
screen.
Brief Procedures
Verify that the time base operates:
2.
a. One period of the square-wave probe-compensation signal is about
five horizontal divisions on-screen for the 200 ms horizontal scale
setting (set in step 1c).
b. Rotating the horizontal SCALE knob clockwise expands the wave-
form on-screen (more horizontal divisions per waveform period), and
that counterclockwise rotation contracts it, and that returning the
horizontal scale to 200 ms returns the period to about five divisions.
c. The horizontal POSITION knob positions the signal left and right
on-screen when rotated.
Remove the test hookup:
3.
and the probe-adjust terminal.
Disconnect the probe from the channel input
Confirm the following statements.
Verify the Main and Delayed Trigger Systems
Equipment Required: One P6138 probe.
Prerequisites:
Procedure:
Install the test hookup and preset the oscilloscope controls:
1.
None.
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
a.
Hook up the signal source:
probe tip to PROBE ADJ on the front panel; leave the probe ground
unconnected. (See Figure 4-3 on page 4-7.)
Initialize the oscilloscope:
b.
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
Modify default settings:
c.
Install the probe on CH 1. Connect the
4Ć9
Brief Procedures
H
Press AUTOSET to obtain a viewable, triggered display.
H
Set the horizontal SCALE for the M (main) time base to 200 ms.
H
Press VERTICAL MENU.
H
Press the main-menu button Bandwidth. Then press the sidemenu button 20 MHz.
H
Press TRIGGER MENU.
H
Press the main-menu button Mode & Holdoff.
H
Press the side-menu button Normal.
H
Press CLEAR MENU to remove the menus from the screen.
Verify that the main trigger system operates:
2.
statements are true.
H
The trigger-level readout for the main trigger system changes
with the trigger MAIN LEVEL knob.
H
The trigger-level knob can trigger and untrigger the square-wave
signal as you rotate it. (Leave the signal
H
Pressing SET LEVEL TO 50% triggers the signal that you just
left untriggered. (Leave the signal triggered.)
Verify that the delayed trigger system operates:
3.
a.
Select the delayed time base:
H
Press HORIZONTAL MENU.
H
Press the main-menu button Time Base.
H
Press the side-menu button Delayed Triggerable; then press the
side-menu button Delayed Only.
H
Set the horizontal SCALE for the D (delayed) time base to
200 ms.
Select the delayed trigger-level menu:
b.
Confirm that the following
un
triggered.)
4Ć10
H
Press SHIFT; then press DELAYED TRIG.
H
Press the main-menu button Level; then press the side-menu
button Level.
Confirm that the following statements are tru
c.
H
The trigger-level readout for the delayed trigger system changes
with the general purpose knob.
H
The general purpose knob can trigger and untrigger the squarewave probe-compensation signal as you rotate it. (Leave the
un
signal
H
Pressing the side-menu
triggered.)
button Set to 50% triggers the probecompensation signal that you just left untriggered. (Leave the
signal triggered.)
e:
Performance Verification
d.
Verify the delayed trigger counter:
H
Press the main-menu button Delay by
H
Press the side-menu button Events, just below the Triggerable
after Time selection.
H
Use the General Purpose knob to enter an event count of 325
events.
H
Verify that the trigger READY indicator on the front panel flashes
about once every second as the waveform is updated on-screen.
Time
Brief Procedures
.
Remove the test hookup:
4.
Disconnect the standard-accessory probe from
the channel input and the probe-adjust terminal.
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
4Ć11
Brief Procedures
4Ć12
Performance Verification
Performance Tests
This subsection contains a collection of procedures for checking that the
TDS 400 Digitizing Oscilloscopes perform as warranted.
The procedures are arranged in four logical groupings:
s,
System Check
utput Ports Checks
O
as checked in Section 1,
appear in boldface type under
can use form at the end of this section as a test record.
These procedures
procedures described on page 4-1. The basic procedures should be
done first, then these procedures performed if desired.
Time Base System Checks, Triggering System Checks
. They check all the characteristics that are designated
Specification.
Warranted Characteristics
extend
(The characteristics that are checked
the confidence level provided by the basic
Signal Acquisition
in Section 1.) You
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 on the digitizing oscilloscope.
H
You must have performed and passed the procedures under
found on page 4-4, and those under
H
A signal-path compensation
mended calibration interval and at a temperature within
present operating temperature. (If at the time you did the prerequisite
the temperature was within the limits just stated, consider this
Tests,
prerequisite met.)
must
Functional Tests,
have been done within the recom-
Self Tests,
found on page 4-6.
_
C of the
, and
Self
H
The digitizing oscilloscope must have been last adjusted at an ambient
temperature between +20_C and +30_C, must have been operating for
a warm-up period of at least 20 minutes, and must be operating at an
ambient temperature between 0_C and +50_C. (The warm-up requirement is usually met in the course of meeting the first prerequisite listed
above.)
Related Information—Read
start on page 4-1. Also, if you are not familiar with operating this digitizing
oscilloscope, read
manual before doing any of these procedures.
General Operating Instructions
General Instructions
Equipment Required
These procedures use external, traceable signal sources to directly check
warranted characteristics. The required equipment list follows this introduction.
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
and
Conventions
in Section 2 of this service
that
4Ć13
Performance Tests
Table 4-1: Test Equipment
Item Number and
Minimum Requirements Example Purpose
Description
1 Attenuator,10X
(two required)
Ratio: 10X; impedance 50 W;
connectors: female BNC input,
male BNC output
2 Attenuator, 5X
(two required)
Ratio: 5X; impedance 50 W;
connectors: female BNC input,
male BNC output
3 Termination,
50
W
Impedance 50 W; connectors:
female BNC input, male BNC
output
4 Termination,
75
W
Impedance 75 W; connectors:
female BNC input, male BNC
output
5 Cable, Precision
Coaxial (three
50 W, 36 in, male to male BNC
connectors
required)
6 Cable, Coaxial 75 W, 36 in, male to male BNC
connectors
7 Connector, Dual-
Female BNC to dual banana Tektronix part number
Banana (two required)
Tektronix part number
011-0059-02
Tektronix part number
011-0060-02
Tektronix part number
011-0049-01
Tektronix part number
011-0102-01
Tektronix part number
012-0482-00
Tektronix part number
012-1338-00
103-0090-00
Signal attenuation
Signal attenuation
Checking delay
match between
channels
Used to test Video
Option 05 equipped
instruments only
Signal interconnection
Used to test Video
Option 05 equipped
instruments only
Various accuracy
tests
8 Connector, BNC
Male BNC to dual female BNC Tektronix part number
“T”
9 Coupler, Dual-
Input
10 Generator, DC
Calibration
11 Generator, Lev-
eled Sine Wave,
Medium Fre-
Female BNC to dual male
BNC
Variable amplitude to 10 V;
accuracy to 0.1%
200 kHz to 250 MHz; Variable
amplitude from 5 mV to 4 V
p-p into 50
W
quency
12 Generator, Lev-
eled Sine Wave,
High Frequency
250 MHz to 500 MHz; Variable
amplitude from 5 mV to 4 V
p-p into 50 W; 6 MHz
reference
1
Requires a TM 500 or TM 5000 Series Power Module Mainframe.
103-0030-00
Tektronix part number
067-0525-02
Data Precision 8200, with
1 kV option installed
TEKTRONIX SG 503 Leveled
Sine Wave Generator
1
TEKTRONIX SG 504 Leveled
Sine Wave Generator
1
with SG
504 Output Head
Checking trigger
sensitivity
Checking delay
match between
channels
Checking DC offset
and measurement
accuracy
Checking analog
bandwidth and trigger sensitivity at low
frequencies
Checking analog
bandwidth and trigger sensitivity at
high frequencies
4Ć14
Performance Verification
Table 4-1: Test Equipment (Cont.)
Performance Tests
Item Number and
Description
13 Generator, Time
Mark
Variable marker frequency
from 10 ms to 10 ns; accuracy
within 2 ppm
14 Probe, 10X, in-
A P6138 probe Tektronix number P6138 Signal interconneccluded with this
instrument
15 Generator, Vid-
eo Signal
1
Requires a TM 500 or TM 5000 Series Power Module Mainframe.
Provides NTSC compatible
outputs
Test Record
Photocopy the next two pages and use them to record the performance test
results for your instrument.
PurposeExampleMinimum Requirements
TEKTRONIX TG 501 Time
Mark Generator
1
Checking samplerate and delay-time
accuracy
tion
TEKTRONIX TSG 1001 Checking video trig-
ger sensitivity
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
4Ć15
Performance Tests
TDS 410, TDS 420, & TDS 460 Test Record
Instrument Serial Number: Certificate Number:
Temperature: RH %:
Date of Calibration: Technician:
Performance T est Minimum Incoming Outgoing Maximum
Offset Accuracy
CH1 Offset +1 V
+10 V
+99.9 V
CH2 Offset +1 V
+10 V
+99.9 V
CH3 Offset +1 V
(TDS 420 & +10 V
TDS 460) +99.9 V
CH4 Offset +1 V
(TDS 420 & +10 V
TDS 460) +99.9 V
995 mV
9.935 V
99.2505 V
995 mV
9.935 V
99.2505 V
995 mV
9.935 V
99.2505 V
995 mV
9.935 V
99.2505 V
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
+1.005 V
+10.065 V
+100.5495 V
+1.005 V
+10.065 V
+100.5495 V
+1.005 V
+10.065 V
+100.5495 V
+1.005 V
+10.065 V
+100.5495 V
DC Voltage Measurement Accuracy (Averaged)
CH1 100 mV –20.8 mV __________ __________ +20.8 mV
CH2 100 mV –20.8 mV __________ __________ +20.8 mV
CH3 100 mV (TDS 420/460) –20.8 mV __________ __________ +20.8 mV
CH4 100 mV (TDS 420/460) –20.8 mV __________ __________ +20.8 mV
Analog Bandwidth
4Ć16
CH1 100 mV 424 mV __________ __________ N/A
CH2 100 mV 424 mV __________ __________ N/A
CH3 100 mV (TDS 420/460) 424 mV __________ __________ N/A
CH4 100 mV (TDS 420/460) 424 mV __________ __________ N/A
Delay Between Channels
Delay Between Channels N/A __________ __________ 450 ps
Time Base System
Long Term Sample Rate/
Delay Time @ 500 ns/10 ms
–3.0 Div __________ __________ +3.0 Div
Delta Time @ 5 ns (100 MHz) 49.592 ns __________ __________ 50.408 ns
Performance Verification
TDS 410, TDS 420, & TDS 460 Test Record (Cont.)
Trigger System (DC Coupled Threshold)
Performance Tests
MaximumOutgoingIncomingMinimumPerformance Test
Main Trigger
Main Trigger – Falling
Delayed Trigger
Delayed Trigger – Falling
–18 mV
–18 mV
–18 mV
–18 mV
__________
__________
__________
__________
__________
__________
__________
___________
+18 mV
+18 mV
+18 mV
+18 mV
Probe Compensator Output Signal
Frequency 950 Hz __________ __________ 1050 Hz
Voltage 475 mV __________ __________ 525 mV
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
4Ć17
Performance Tests
Signal Acquisition
System Checks
These procedures check those characteristics that relate to the signal-acquisition system and are listed as checked under
Section 1,
Check Offset Accuracy
Equipment Required: Two dual-banana connectors (Item 7), one BNC T
connector (Item 8), one DC calibration generator (Item 10), and two precision
coaxial cables (Item 5).
Prerequisites:
page 4-13.
1.
Dual Banana to
BNC Adapters
Warranted Characteristics
Specification.
The oscilloscope must meet the prerequisites listed on
Install the test hookup and preset the instrument controls:
DC Calibrator
Output Sense
HI
LO
in
Figure 4-4: Initial Test Hookup
Hook up the test-signal source:
a.
H
Set the output of a DC calibration generator to 0 volts.
H
Connect the output of a DC calibration generator through a
dual-banana connector followed by a 50 W precision coaxial cable
to one side of a BNC T connector.
H
Connect the Sense output of the generator through a second
dual-banana connector followed by a 50 W precision coaxial cable
to the other side of the BNC T connector. Now connect the
BNC T connector to CH 1.
Initialize the oscilloscope:
b.
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
Coaxial Cables
BNC T
Connector
1Ć18
Modify the default settings:
c.
H
Set the horizontal SCALE to 1 ms.
Performance Verification
Performance Tests
H
Press SHIFT; then ACQUIRE MENU.
H
Press the main-menu button Mode; then press the side-menu
button Hi Res.
H
Press DISPLAY .
H
Press the main-menu button Graticule; then press the side-menu
button Frame.
H
Press MEASURE.
H
Press the main-menu button Select Measurement for CHx; then
press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)
H
Press CLEAR MENU.
Confirm input channels are within limits for offset accuracy:
2.
ing substeps—test CH 1 first,
skipping substep a since CH 1 is already
set up to be checked from step 1.
WARNING
High voltages are used in this procedure. Before doing this or any
other procedure in this manual, read the Safety Summary found at
the beginning of this manual.
a.
Select an unchecked channel:
H
Press WAVEFORM OFF to remove the channel just confirmed
from the display. Then, press the front-panel button that corresponds to the channel you are to confirm.
H
Press MEASURE.
H
Press the main-menu button Select Measurement for CHx; then
press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)
Do the follow-
TDS 410, TDS 420, & TDS 460 Performance Verification
Table 4-2: DC Offset Accuracy
Vertical
Scale
Vertical
Position
Offset
Setting
Generator
Setting
Offset Accuracy
Limits
Setting
1mV 0 +1 V +1 V mV
100 mV 0 +10 V +10 V mV
1V 0 +99.9 V +99.9 V mV
1Ć19
Performance Tests
b.
Set the vertical scale:
listed in Table 4-2 that is not yet checked. (Start with the first setting
listed.)
Set the vertical SCALE to one of the settings
Set the offset:
c.
Offset main-menu button. Using the General Purpose knob, set the
offset as dictated by Table 4-2. (Start with the first setting listed.)
Set the generator:
d.
vertical scale as dictated by Table 4-2. (Start with the first setting
listed.)
Check against limits:
e.
H
Subtract the measured mean from the generator setting. The
result is the offset accuracy
H
CHECK that the offset accuracy is within the limits listed for the
current vertical scale setting.
H
Repeat substeps b through e until all vertical scale settings listed
in Table 4-2 are checked for the channel under test.
Test all channels:
f.
Disconnect the hookup:
3.
a.
Set the generator output to 0 V
b. Then disconnect the cable from the generator output at the input
connector of the channel last tested.
Press the VERTICAL MENU button and then the
Set the DC calibration generator to match the
Do the following subparts in the order listed.
Repeat substeps a through e for all input channels.
.
Check DC Voltage Measurement Accuracy (Averaged)
Equipment Required: Two dual-banana connectors (Item 7), one BNC T
connector (Item 8), one DC calibration generator (Item 10), and two precision
coaxial cables (Item 5).
Prerequisites:
page 4-13.
Procedure:
Install the test hookup and preset the instrument controls:
1.
a.
Hook up the test-signal source:
H
H
H
The oscilloscope must meet the prerequisites listed on
Set the output of a DC calibration generator to 0 volts.
Connect the output of a DC calibration generator through a
dual-banana connector followed by a 50 W precision coaxial cable
to one side of a BNC T connector (see Figure 4-5).
Connect the Sense output of the generator through a second
dual-banana connector followed by a 50 W precision coaxial cable
to the other side of the BNC T connector. Now connect the
BNC T connector to CH 1.
1Ć20
Performance Verification
Dual Banana to
BNC Adapters
DC Calibrator
Output Sense
Performance Tests
HI
LO
Figure 4-5: Initial Test Hookup
Initialize the oscilloscope:
b.
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
Modify the default settings:
c.
H
Press SHIFT; then ACQUIRE MENU.
H
Press the main-menu button Mode; then press the side-menu
button Average 16.
H
Press DISPLAY .
H
Press the main-menu button Graticule; then press the side-menu
button Frame.
H
Press MEASURE.
Coaxial Cables
BNC T
Connector
TDS 410, TDS 420, & TDS 460 Performance Verification
H
Press the main-menu button Select Measurement for CHx; then
press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)
H
Set the vertical SCALE to 100 mV.
H
Press the VERTICAL MENU button and then the Offset mainmenu button. Set the offset to 0 V.
H
Set the vertical POSITION to 0 V.
Confirm input channels are within limits for DC delta voltage accuracy:
2.
the following substeps—test CH 1 first,
skipping substep a since CH 1 is
already selected from step 1.
a.
Select an unchecked channel:
H
Set the generator output to 0 V.
H
Press WAVEFORM OFF to remove the channel just confirmed
from the display.
Do
1Ć21
Performance Tests
H
Press the front-panel button that corresponds to the next channel
you are to confirm.
H
Press MEASURE.
H
Press the main-menu button Select Measurement for CHx; then
press the side-menu button Mean. (You will have to press MORE
several times to access the Mean measurement.)
H
Move the test hook up to the channel you select.
H
Set the vertical SCALE to 100 mV.
H
Set the vertical POSITION to 0 V.
H
Press the VERTICAL MENU button and then the Offset mainmenu button. Set the offset to 0 V.
Set the generator:
b.
Record Measurement:
c.
and record this number on a piece of scratch paper.
Set the generator:
d.
Check against limits:
e.
H
Use this formula to calculate voltage measurement accuracy.
700 mV – (mean from step c – (present mean))
For example:
700 mV – (347 mV – (–358 mV)) = –5 mV
H
CHECK that the voltage measurement accuracy is within
"
20.8 mV.
Test all channels:
f.
Disconnect the hookup:
3.
a.
Set the generator output to 0 V
b. Then disconnect the cable from the generator output at the input
connector of the channel last tested.
Set the DC calibration generator to +0.35 V.
Read the mean at the measurement readout
Set the DC calibration generator to –0.35 V.
Do the following subparts in the order listed.
Repeat substeps a through e for all channels.
.
1Ć22
Check Analog Bandwidth
Equipment Required for TDS 410 and TDS 420: One medium-frequency
leveled sine-wave generator (Item 11), one 50 W precision cable (Item 5), and
two 10X attenuators (Item 1).
Equipment Required for TDS 460:
generator and its leveling head (Item 12), one 50 W precision cable (Item 5),
and two 10X attenuators (Item 1).
Prerequisites:
See page 4-13.
One high-frequency leveled sine-wave
Performance Verification
Procedure:
Install the test hookup and preset the instrument controls:
1.
a.
Initialize the oscilloscope:
H
Press save/recall SETUP. Then press the main-menu button
Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
b.
Modify the default settings:
H
Set the horizontal SCALE to 10 ms (TDS 410 and TDS 420) or
50 ns (TDS 460).
H
Press TRIGGER MENU.
H
Press the main-menu button COUPLING; then press the side
menu button Noise Rej.
H
Press SHIFT; then ACQUIRE MENU.
H
Press the main-menu button Mode; then press the side-menu
button Average 16.
Performance Tests
H
Press Measure. Now press the main-menu button High–Low
Setup; then press the side-menu button Min–Max.
Medium
Frequency
Sine Wave
Generator
Output
Figure 4-6: Initial Test Hookup (TDS 410 and TDS 420)
c.
TDS 410 and TDS 420: Hook up the test-signal source:
Connect,
through a 50 W precision cable, the sine-wave output of a mediumfrequency leveled sine-wave generator to CH 1. Set the output of the
generator to a reference frequency of 50 kHz.
TDS 410, TDS 420, & TDS 460 Performance Verification
1Ć23
Performance Tests
High
Frequency
Sine Wave
Generator
Output
Leveling Head
Figure 4-7: Initial Test Hookup (TDS 460)
TDS 460: Hook up the test-signal source:
d.
Connect, through its leveling head, the sine-wave output of a high-frequency leveled sine-wave
generator to CH 1. Set the output of the generator to a reference
frequency of 6 MHz.
Confirm the input channels are within limits for analog bandwidth:
2.
—
following substeps
test CH 1 first,
skipping substeps a and b since CH 1
is already set up for testing from step 1.
a.
Select an unchecked channel:
H
Press WAVEFORM OFF to remove the channel just confirmed
from display.
H
Press the front-panel button that corresponds to the channel you
are to confirm.
H
Move the leveling head to the channel you select.
b.
Match the trigger source to the channel selected:
H
Press TRIGGER MENU.
H
Press the main-menu button Source.
H
Press the side-menu button that corresponds to the channel
selected.
Do the
1Ć24
Set its input impedance:
c.
H
Press VERTICAL MENU; then press the main-menu button
Coupling.
H
Press the side-menu button W to toggle it to the 50 W setting.
Set the vertical scale:
d.
Set the vertical SCALE to one of the settings
listed in Table 4-3 (TDS 410 and TDS 420) or Table 4-4 (TDS 460)
not yet checked. (Start with the 100 mV setting.)
Performance Verification
Table 4-3: Analog Bandwidth (TDS 410 and TDS 420)
Performance Tests
Vertical
Scale
Attenuators
(10X)
Reference Amplitude
(at 50 MHz)
Horizontal
Scale
Test
Frequency
100 mV none 600 mV (6 divisions) 5 ns 150 MHz
1 V none 5 V (5 divisions) 5 ns 150 MHz
500 mV none 3 V (6 divisions) 5 ns 150 MHz
200 mV none 1.2 V (6 divisions) 5 ns 150 MHz
50 mV 1 300 mV (6 divisions) 5 ns 150 MHz
20 mV 1 120 mV (6 divisions) 5 ns 150 MHz
10 mV 1 60 mV (6 divisions) 5 ns 150 MHz
5mV 2 30 mV (6 divisions) 5 ns 150 MHz
2mV 2 12 mV (6 divisions) 5 ns 110 MHz
1mV 2 6 mV (6 divisions) 5 ns 90 MHz
Table 4-4: Analog Bandwidth (TDS 460)
Vertical
Scale
Attenuators
(10X)
Reference Amplitude
(at 6 MHz)
Horizontal
Scale
Test
Frequency
Limits
424 mV
3.535 V
2.121 V
848 mV
212 mV
84 mV
42 mV
21 mV
8.4 mV
4.2 mV
Limits
100 mV none 600 mV (6 divisions) 2 ns 350 MHz
1 V none 5 V (5 divisions) 2 ns 350 MHz
500 mV none 3 V (6 divisions) 2 ns 350 MHz
200 mV none 1.2 V (6 divisions) 2 ns 350 MHz
50 mV 1 300 mV (6 divisions) 2 ns 350 MHz
20 mV 1 120 mV (6 divisions) 2 ns 350 MHz
5mV 2 30 mV (6 divisions) 2 ns 350 MHz
2mV 2 12 mV (6 divisions) 2 ns 250 MHz
1mV 2 6 mV (6 divisions) 2 ns 100 MHz
e.
Display the test signal:
Do the following subparts to first display the
reference signal and then the test signal.
H
Press MEASURE; then press the main-menu button Select
Measurement for CHx.
H
Now press the side menu button more until the menu label Pk-Pk
appears in the side menu (its icon is shown at the left). Press the
side-menu button Pk-Pk.
424 mV
3.535 V
2.121 V
848 mV
212 mV
84 mV
21 mV
8.4 mV
4.2 mV
TDS 410, TDS 420, & TDS 460 Performance Verification
H
Press CLEAR MENU.
1Ć25
Performance Tests
H
Set the generator output so the CHx Pk-Pk readout equals the
reference amplitude in Table 4-3 (TDS 410 and TDS 420) or
Table 4-4 (TDS 460) that corresponds to the vertical scale set in
substep d.
H
Press the front-panel button SET LEVEL TO 50% as necessary
to trigger a stable display.
Measure the test signal:
f.
H
Increase the frequency of the generator output to the test frequency in Table 4-3 (TDS 410 and TDS 420) or Table 4-4 (TDS
460) that corresponds to the vertical scale set in substep d.
H
Set the horizontal SCALE to 5 ns (TDS 410 and TDS 420) or
2 ns (TDS 460).
H
Press SET LEVEL TO 50% as necessary to trigger the display.
H
Read the results at the CHx Pk-Pk readout, which automatically
measures the amplitude of the test signal. (See Figure 4-8.)
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 4-8: Measurement of Analog Bandwidth
Check against limits:
g.
H
CHECK that the Pk-Pk readout on screen is within the limits
listed in Table 4-3 (TDS 410 and TDS 420) or Table 4-4 (TDS
460) for the current vertical scale setting
.
1Ć26
H
When finished checking, set the horizontal SCALE back to the
10 ms (TDS 410 and TDS 420) or 50 ns (TDS 460) setting.
Performance Verification
Performance Tests
Checking the bandwidth of each channel at all vertical scale settings
is time consuming and unnecessary. Y ou may skip checking the
remaining vertical scale settings in Table 4-3 (TDS 410 and TDS 420)
or Table 4-4 (TDS 460) (that is, skip the following substep, h) if this
digitizing oscilloscope has performed as follows:
H
Passed the 100 mV vertical scale setting just checked in this
procedure.
H
Passed the
Diagnostics
Verify Internal Adjustment, Self Compensation, and
procedure found under
Self Tests,
on page 4-4.
NOTE
Passing the signal path compensation confirms the signal path for
all vertical scale settings for all channels. Passing the internal
diagnostics ensures that the factory-set adjustment constants that
control the bandwidth for each vertical scale setting have not
changed.
h.
Check remaining vertical scale settings against limits (optional):
H
If desired, finish checking the remaining vertical scale settings for
the channel under test by repeating substeps d through g for
each of the remaining scale settings listed in Table 4-3 (TDS 410
and TDS 420) or Table 4-4 (TDS 460) for the channel under test.
H
When doing substep e, skip the subparts that turn on the CHx
Pk-Pk measurement until you check a new channel.
H
Install/remove 10X attenuators between the generator leveling
head and the channel input as is needed to obtain the six division
reference signals listed in the table.
Test all channels:
i.
Disconnect the hookup:
3.
nector of the channel last tested.
Check Delay Match Between Channels
Equipment Required: One medium-frequency leveled sine-wave generator
(Item 11), one precision coaxial cable (Item 5), one 50 W terminator (Item 3),
and a dual-input coupler (Item 9).
Prerequisites:
Procedure:
DO NOT use the vertical position knob to reposition any channel
while doing this check. To do so invalidates the test.
Install the test hookup and preset the instrument controls:
1.
TDS 410, TDS 420, & TDS 460 Performance Verification
See page 4-13.
Repeat substeps a through g for all channels.
Disconnect the test hook up from the input con-
1Ć27
Performance Tests
a.
Initialize the front panel;
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
Modify the initialized front-panel control settings:
b.
H
Do
not
adjust the vertical position of any channel during this
procedure.
H
Set the horizontal SCALE to 1 ns.
H
Press SHIFT; then press ACQUIRE MENU.
H
Press the main-menu button Mode, and then press the sidemenu button Average 16.
Hook up the test-signal source:
c.
H
Connect the sine wave output of a medium-frequency sine wave
generator to a 50 W precision coaxial cable, a 50 W
and a dual-input coupler. (Refer to Figure 4-9.)
termination,
H
Connect the coupler to both CH 1 and CH 2.
coupler cables are of equal length.
Medium
Frequency
Sine Wave
Generator
Output
50
W
T erminator
Figure 4-9: Initial Test Hookup
Confirm all channels are within limits for channel delay:
2.
a.
Set up the generator:
Set the generator frequency to 250 MHz and
the amplitude for about five divisions in CH 1.
Ensure that the
Dual Input Coupler
1Ć28
Hint: as you are adjusting the generator amplitude, push SET LEVEL
TO 50% frequently to speed up the updating of the waveform ampli-
tude on screen.
Performance Verification
Performance Tests
b.
Save a CH 2 waveform:
Press CH 2; then press save/recall WAVE-
FORM. Now, press the main-menu button Save Waveform; then
press the side-menu button To Ref 2.
c. If you are testing a TDS 410, skip to step h.
Save a CH 3 waveform:
d.
Move the coupler from CH 2 to CH 3, so that
CH 1 and CH 3 are driven. Press CH 3; then press the side-menu
button To Ref 3.
Display all test signals:
e.
H
Press WAVEFORM OFF twice to remove CH 2 and CH 3 from
the display.
H
Move the coupler from CH 3 to CH 4, so that CH 1 and CH 4 are
driven. Press CH 4 to display.
H
Now, press the front-panel button MORE. Press the main-menu
buttons Ref 2 and Ref 3.
Measure the test signal:
f.
H
Locate the point on the rising edge of the left-most waveform
where it crosses the center horizontal graticule line. This is the
time reference point
time reference point
H
Press CURSOR; then press the side-menu button V Bars.
H
Press CLEAR MENU.
H
Rotate the General Purpose knob to align one cursor to the
reference point
cursor to the
time reference point
for this waveform. Note the corresponding
for right-most waveform. See Figure 4-10.
of the left-most waveform edge and the other
of the right-most waveform
edge. (Press TOGGLE to switch between the two cursors.) See
Figure 4-10.
time
H
Read the measurement results at the D: cursor readout, not the
@: readout on screen.
TDS 410, TDS 420, & TDS 460 Performance Verification
1Ć29
Performance Tests
First, display the live/reference
waveforms for all four channels.
Note their overlapping ground
Second, identify the time reference
points of those waveforms.
Third, turn on the cursor and align
the V bar cursors to the time
reference points.
Fourth, read the results
references.
here.
Figure 4-10: Measurement of Channel Delay
Check all channels against limit:
g.
CHECK that the cursor readout on
screen is 450 ps. If the cursor readout is 200 ps, skip substep h.
Check CH 1 to CH 2 and CH 3 to CH 4 against limit:
h.
H
Press WAVEFORM OFF four times to remove all waveforms.
H
Press CH 1.
H
Press MORE; then press the main-menu button Ref 2.
H
Measure the delay between CH 1 and Ref 2 using the method
described in substep f above.
H
CHECK that the cursor readout on screen is 200 ps.
H
If you are testing a TDS 410, skip to step 3.
H
Press WAVEFORM OFF twice to turn off CH 1 and Ref 2; then
press CH 4 to turn on CH 4.
H
Press MORE; then press the main-menu button Ref 3 to display
the CH 3 waveform stored in Ref 3.
H
Measure the delay between Ref 3 and CH 4 using the method
described in substep f above.
1Ć30
H
CHECK that the cursor readout on screen is 200 ps.
Disconnect the hookup:
3.
Disconnect the cable from the generator output
at the input connectors of the channels.
Performance Verification
Performance Tests
Time Base System
Checks
These procedures check those characteristics that relate to the Main and
Delayed time base system and are listed as checked under
acteristics
in Section 1,
Specification.
Warranted Char-
Check Accuracy for Long-Term Sample Rate, Delay Time,
and Delta Time Measurements
Equipment Required: One time-marker generator (Item 13) and one preci-
sion coaxial cable (Item 5).
Prerequisites:
Procedure:
Time-Mark
Generator
See page 4-13.
Output
Figure 4-11: Initial Test Hookup
Install the test hookup and preset the instrument controls:
1.
a.
Hook up the test-signal source
coaxial cable, the time-mark output of a time-marker generator to
CH 1. Set the output of the generator for 10 ms markers.
Initialize the oscilloscope:
b.
H
Press save/recall SETUP.
H
Press the main-menu button Recall Factory Setup.
H
Press the side-menu button OK Confirm Factory Init.
Modify the initialized front-panel control settings:
c.
H
Set the vertical SCALE to 500 mV.
H
Press VERTICAL MENU; then press the main-menu button
Coupling. Press the side-menu button W to change the coupling
setting to 50 W.
H
Press SET LEVEL TO 50%.
H
Use the vertical POSITION knob to center the test signal on
screen.
: Connect, through a 50 W precision
TDS 410, 420 & TDS 460 Service Manual (Company Confidential Final Draft)
4Ć31
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