Tektronix TLS 216 Service Manual

Service Manual

TLS 216 Logic Scope

070-8831-02

This document applies for firmware version 1.00 and above.

Warning

The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to the Safety Summary prior to performing service.

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

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

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

Printed in the U.S.A. T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000 TEKTRONIX and TEK are registered trademarks of T ektronix, Inc. BusForm, GURU, and QUICKCLIP are trademarks of T ektronix, Inc.

TLS 216 WARRANTY

T ektronix 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, T ektronix, 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 T ektronix, with shipping charges prepaid. T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the T ektronix 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. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than T ektronix 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 CUST OMER 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.

P6240 WARRANTY

T ektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, T ektronix, 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.

Specification

List of Figures vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Tables ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual Structure xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Modules xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Symbols xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Instructions xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Manuals xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Before Servicing xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Strategy for Servicing xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ektronix Service xviii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warranty Repair Service xviii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair or Calibration Service xviii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Self Service xix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Information

Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warranted Characteristics 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Characteristics 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Nominal Traits 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supplying Operating Power 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Cord Information 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Voltage 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Memory Backup Power 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Environment 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating T emperature 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ventilation Requirements 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Applying and Interrupting Power 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power On 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Off 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repackaging Instructions 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Operating Instructions 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screen Layout 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Basic Procedures 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Table of Contents

How to Power On 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Use Help 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Display Logic Scope Status 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Reset the Logic Scope 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Set Functions from the Front Panel 2–9. . . . . . . . . . . . . . . . . . . . . . . . .

How to Set Functions from Menus 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Set Complex Functions 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Instructions for Waveform Groups 2–15. . . . . . . . . . . . . . . . . . .

Vertical Readout 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Adjust the Vertical Setup 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Scale and Position Waveform Groups 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Set Up from the Vertical Controls Menu 2–17. . . . . . . . . . . . . . . . . . . . . . . . .

How to Select Groups and Channels 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Select a Group 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Select a Channel 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Remove a Group from the Display 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Create a Waveform Group 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Define a Group 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Delete a Group 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How to Choose the Group Display Mode 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Select a Group Mode 2–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Display Only the Selected Channel 2–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Define Group Thresholds and Height 2–24. . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Remove a Group from the Display 2–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o Find More Information 2–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Theory of Operation

Circuit Description 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Logic Conventions 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Overview 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification

Introduction 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1S 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Information 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Brief Procedures 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Self Tests 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional T ests 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Tests 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation: Clear Probe Calibrations 4–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify Internal Adjustment, Self Calibration, and Diagnostics 4–5. . . . . . . . . .

Verify Probe Function and Calibration 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify All Input Channels 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify the Time Base 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verify the Main and Delayed Trigger Systems 4–11. . . . . . . . . . . . . . . . . . . . . . .

Verify the File System 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Prerequisites 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Record 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Adjustment Procedures

Table of Contents

Signal Acquisition System Checks 4–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy of Offset (Zero Setting) 4–25. . . . . . . . . . . . . . . . . . . . . . . . . . .

Check DC Gain and Voltage Measurement Accuracy 4–26. . . . . . . . . . . . . . . . .

Check Analog Bandwidth 4–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Delay Between Channels 4–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time Base System Check 4–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy for Long-T erm Sample Rate, Delay Time, and Delta Time

Measurements 4–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trigger System Checks 4–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy for Logic Triggering 4–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Accuracy, T rigger Threshold 4–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sensitivity, Edge Trigger 4–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Signal Checks 4–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Outputs — Probe Compensator 4–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Outputs — Main and Delayed Trigger 4–53. . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedures 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Requirements for Performance 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Personnel 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warm-Up Period 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Access 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Peripherals 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Instructions 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hardware Installation 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Software Installation 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Software-Based Adjustments 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Assembly Adjustment 5–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rotation, Brightness, and Contrast Adjustment 5–9. . . . . . . . . . . . . . . . . . . . . .

Maintenance

TLS 216 Service Manual

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iii

Table of Contents

Inspection — Exterior 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning Procedure — Exterior 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection — Interior 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning Procedure — Interior 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubrication 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal and Installation Procedures 6–9. . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation — Please Read 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Modules 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Instructions 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Summary of Procedures 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Access Procedure 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for External Modules 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front-Panel Knobs 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line Fuse and Line Cord 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EMI Gaskets 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear Cover and Cabinet 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Cover, T rim Ring, Menu Buttons, and Input Panel 6–21. . . . . . . . . . . . . . .

A12 Front-Panel Assembly and Probe Calibrator 6–23. . . . . . . . . . . . . . . . . . . .

Display-Frame Assembly 6–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cabinet Modules 6–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for Outer-Chassis Modules 6–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input Cable Assembly 6–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Probe Flex Circuit Replacement 6–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fan 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A14 D1 Bus and Analog-Power and Digital-Power Cables 6–33. . . . . . . . . . . . .

A23 SerPar Assembly 6–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A11 Processor/Display Board 6–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T op Cover and Board Brackets 6–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear-Panel Cables 6–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A10 Acquisition Board 6–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Floppy Disk 6–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear Chassis 6–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for Inner-Chassis Modules 6–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A16 Low Voltage Power Supply 6–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A30 Display Assembly and Supply Fuse 6–48. . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Subpanel 6–52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main Chassis 6–54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Disassembly for Cleaning 6–54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 6–57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostics 6–57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Firmware Updates 6–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting Procedures 6–59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options

Options and Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Electrical Parts List

Diagrams

Table of Contents

Options A1–A5: International Power Cords 7–1. . . . . . . . . . . . . . . . . . . . . . . . .

Option B1: Service Manual 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1B: Coaxial Adapter Set 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1K: K420 Instrument Cart 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warranty-Plus Service Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1P: HC100 4 Pen Plotter 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1R: Rackmounted Logic Scope 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 2P: Phaser 200e Color Printer 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 9C: Certificate of Calibration and T est Data Report 7–2. . . . . . . . . . . . .

Standard Accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessory Software 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warranty Information 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Symbols 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mechanical Parts List

Replaceable Parts List 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Table of Contents

List of Figures

Figure 2–1: Map of Display Functions 2–8. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–2: Vertical Readout Displaying Two Group Readouts 2–15. . . . .

Figure 2–3: The Vertical Readout and Vertical Controls Menu 2–17. . . . .

Figure 2–4: Groups — Valid and Invalid 2–20. . . . . . . . . . . . . . . . . . . . . . .

Figure 2–5: Display Modes 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–1: Map of Display Functions 4–3. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–2: Verifying Adjustments and Signal-Path

Compensation 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–3: Test Hookup for Functional Tests 4–8. . . . . . . . . . . . . . . . . . .

Figure 4–4: Square Wave Calibration and DC Baseline Signals 4–9. . . .

Figure 4–5: Measurement of DC Offset Accuracy at Zero Setting 4–26. . .

Figure 4–6: Test Hookup for DC Gain and Accuracy Tests 4–27. . . . . . . .

Figure 4–7: Measurement of DC Gain Accuracy 4–28. . . . . . . . . . . . . . . . .

Figure 4–8: Measurement of DC Accuracy 4–30. . . . . . . . . . . . . . . . . . . . . .

Figure 4–9: Test Hookup for Analog Bandwidth Test 4–32. . . . . . . . . . . . .

Figure 4–10: Measurement of Analog Bandwidth 4–33. . . . . . . . . . . . . . . .

Figure 4–11: Test Hookup for Channel Delay Test 4–34. . . . . . . . . . . . . . . .

Figure 4–12: Measurement of Channel Delay 4–35. . . . . . . . . . . . . . . . . . .

Figure 4–13: Test Hookup for Time Base System Check 4–37. . . . . . . . . . .

Figure 4–14: Measurement of Accuracy — Long-Term and

Delay Time 4–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–15: Test Hookup for Logic Trigger Check 4–40. . . . . . . . . . . . . .

Figure 4–16: Test Hookup for Trigger Threshold Check 4–43. . . . . . . . . .

Figure 4–17: Measurement of Trigger-Level Accuracy 4–45. . . . . . . . . . . .

Figure 4–18: Test Hookup for Main Edge Trigger Sensitivity

Checks 4–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–19: Measurement of Trigger Sensitivity 4–48. . . . . . . . . . . . . . . .

Figure 4–20: Test Hookup for AUX TRIGGER Input Sensitivity

Check 4–49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–21: Test Hookup for Probe Compensator Check 4–51. . . . . . . . .

Figure 4–22: Measurement of Probe Compensator Limits 4–52. . . . . . . . .

Figure 4–23: Test Hookup for Main Trigger Output Check 4–53. . . . . . . .

Figure 4–24: Measurement of Main Trigger Output Limits 4–54. . . . . . . .

Figure 5–1: Accessing the Protection Switch 5–8. . . . . . . . . . . . . . . . . . . .

Figure 5–2: Five and Ten Percent Luminance Patches 5–10. . . . . . . . . . . .

Figure 6–1: External Modules 6–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Table of Contents

Figure 6–2: Outer-Chassis Modules 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–3: Inner-Chassis Modules 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–4: Knob Removal 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–5: Line Fuse and Line Cord Removal 6–18. . . . . . . . . . . . . . . . . .

Figure 6–6: Rear Cover and Cabinet Removal 6–21. . . . . . . . . . . . . . . . . .

Figure 6–7: Front Cover, Trim Ring, Menu Buttons, and Input Panel

Removal (Front Cover not Shown) 6–22. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–8: A12 Front-Panel Assembly Removal 6–24. . . . . . . . . . . . . . . . .

Figure 6–9: Disassembly of Front-Panel Assembly 6–25. . . . . . . . . . . . . . .

Figure 6–10: Cabinet Modules Removal 6–28. . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–11: Input Cable Assembly Routing 6–30. . . . . . . . . . . . . . . . . . . .

Figure 6–12: Cable Tie Removal for New Installations 6–31. . . . . . . . . . . .

Figure 6–13: A14 D1 Bus and Analog-Power and Digital-Power Cables

Removal 6–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–14: Circuit Board Assembly Removal 6–35. . . . . . . . . . . . . . . . . .

Figure 6–15: Remove Circuit Board From Assembly 6–36. . . . . . . . . . . . .

Figure 6–16: A11 Processor/Display Removal 6–38. . . . . . . . . . . . . . . . . . .

Figure 6–17: Board Bracket Removal 6–39. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–18: A10 Acquisition Board Removal 6–42. . . . . . . . . . . . . . . . . . .

Figure 6–19: Floppy Disk Removal 6–44. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–20: Rear Chassis Removal 6–46. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–21: A16 Low Voltage Power Supply Removal 6–48. . . . . . . . . . .

Figure 6–22: Display Assembly Removal 6–50. . . . . . . . . . . . . . . . . . . . . . .

Figure 6–23: Display-Driver Board Removal 6–51. . . . . . . . . . . . . . . . . . . .

Figure 6–24: Front Subpanel Removal 6–53. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–25: Accessing the Protection Switch 6–58. . . . . . . . . . . . . . . . . . .

Figure 6–26: Primary Troubleshooting Procedure 6–60. . . . . . . . . . . . . . .

Figure 6–27: Module Isolation Troubleshooting Procedure 6–62. . . . . . . .

Figure 6–28: Power Supply Voltage Measurement Locations 6–63. . . . . . .

Figure 6–29: A16 Low Voltage Power Supply Module Isolation

Troubleshooting Procedure 6–64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–30: Display Troubleshooting Procedure 6–66. . . . . . . . . . . . . . . .

Figure 6–31: Horizontal and Vertical Sync Signals 6–67. . . . . . . . . . . . . . .

Figure 6–32: A Video Signal with White, Black, and Blanking Levels 6–67

Figure 6–33: Processor/Acquisition Troubleshooting Procedure 6–68. . . .

Figure 6–34: Processor/Front Panel Troubleshooting Procedure 6–69. . . .

Figure 6–35: Acquisition Troubleshooting Procedure 6–70. . . . . . . . . . . . .

Figure 6–36: Acquisition Troubleshooting Procedure (Cont.) 6–71. . . . . .

TLS 216 Service Manual

vii

Table of Contents

Figure 6–37: A11 DRAM Processor/Display Module

(View of Right Side) 6–72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–38: A11 DRAM Processor/Display Module

(View of Upper Left Corner) 6–73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–39: A11 DRAM Processor/Display Module

(View of Lower Left Corner) 6–74. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–1: TLS 216 Block Diagram 9–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–2: TLS 216 Interconnect Diagram 9–4. . . . . . . . . . . . . . . . . . . . .

Figure 10–1: Cabinet and Front Panel 10–5. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–2: Outer-Chassis Modules 10–7. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–3: Inner-Chassis Modules 10–8. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–4: Floppy Disk 10–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–5: Cabling 10–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–6: Accessories 10–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii

TLS 216 Service Manual

List of Tables

Table of Contents

Table 1–1: Warranted Characteristics: Input System 1–3. . . . . . . . . . . .

Table 1–2: Warranted Characteristics: Signal Acquisition System 1–3. .

Table 1–3: Warranted Characteristics: Time Base System 1–5. . . . . . . .

Table 1–4: Warranted Characteristics: Triggering System 1–5. . . . . . . .

Table 1–5: Warranted Characteristics: Output Ports and Power

Distribution System 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–6: Warranted Characteristics: Environmental 1–6. . . . . . . . . . .

Table 1–7: Typical Characteristics: Input System 1–9. . . . . . . . . . . . . . . .

Table 1–8: Typical Characteristics: Signal Acquisition System 1–9. . . . .

Table 1–9: Typical Characteristics: Triggering System 1–10. . . . . . . . . . .

Table 1–10: Typical Characteristics: Display and Data Handling

Systems 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–11: Typical Characteristics: Operating Environment 1–11. . . . .

Table 1–12: Nominal Traits: Input System 1–13. . . . . . . . . . . . . . . . . . . . .

Table 1–13: Nominal Traits: Signal Acquisition System 1–13. . . . . . . . . . .

Table 1–14: Nominal Traits: Time Base System 1–14. . . . . . . . . . . . . . . . .

Table 1–15: Nominal Traits: Triggering System 1–14. . . . . . . . . . . . . . . . .

Table 1–16: Nominal Traits: Display System 1–14. . . . . . . . . . . . . . . . . . . .

Table 1–17: Nominal Traits: GPIB Interface and Output Ports 1–14. . . .

Table 1–18: Nominal Traits: Fuse Rating 1–15. . . . . . . . . . . . . . . . . . . . . . .

Table 1–19: Nominal Traits: Mechanical 1–15. . . . . . . . . . . . . . . . . . . . . . .

Table 2–1: Power-Cord Conductor Identification 2–2. . . . . . . . . . . . . . . .

Table 2–2: Power Cord Identification 2–3. . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–3: Effects of Corrupted Data 2–5. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–1: Test Equipment 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–2: DC Accuracy 4–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–3: Settings For Logic Trigger Accuracy Checks 4–40. . . . . . . . . .

Table 5–1: Calibration Tests 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–2: Adjustments Required for Module Replaced 5–4. . . . . . . . . .

Table 5–3: Adjustments and Dependencies 5–4. . . . . . . . . . . . . . . . . . . . .

Table 5–4: Test Equipment, Fixtures, and Supplies 5–4. . . . . . . . . . . . . .

Table 5–5: GPIB Board Configuration 5–6. . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–1: Relative Susceptibility to Static-Discharge Damage 6–2. . . . .

Table 6–2: External Inspection Check List 6–6. . . . . . . . . . . . . . . . . . . . .

Table 6–3: Internal Inspection Check List 6–6. . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Table of Contents

Table 6–4: Tools Required for Module Removal 6–11. . . . . . . . . . . . . . . . .

Table 6–5: Normal Supply Voltages (Measured on J26 and J27 on the

A11 DRAM Processor/Display Module) 6–63. . . . . . . . . . . . . . . . . . . .

Table 6–6: No-Load Supply Voltages (Measured on J5 and J6 on the

A16 Low Voltage Power Supply Module) 6–63. . . . . . . . . . . . . . . . . . .

Table 7–1: International Power Cords 7–1. . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–2: Standard Accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–3: Optional Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–4: Accessory Software 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TLS 216 Service Manual

Service Safety Summary

Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service

procedures.

Do Not Service Alone

Disconnect Power

Use Caution When

Servicing the CRT

Use Care When Servicing

With Power On

Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present.

To avoid electric shock, disconnect the main power by means of the power cord or, if provided, the power switch.

To avoid electric shock or injury, use extreme caution when handling the CRT. Only qualified personnel familiar with CRT servicing procedures and precautions should remove or install the CRT.

CRTs retain hazardous voltages for long periods of time after power is turned off. Before attempting any servicing, discharge the CRT by shorting the anode to chassis ground. When discharging the CRT, connect the discharge path to ground and then the anode. Rough handling may cause the CRT to implode. Do not nick or scratch the glass or subject it to undue pressure when removing or installing it. When handling the CRT, wear safety goggles and heavy gloves for protection.

Dangerous voltages or currents may exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components.

X-Radiation

TLS 216 Service Manual

To avoid electric shock, do not touch exposed connections.

To avoid x-radiation exposure, do not modify or otherwise alter the high-voltage circuitry or the CRT enclosure. X-ray emissions generated within this product have been sufficiently shielded.

Service Safety Summary

xii

TLS 216 Service Manual

Preface

Manual Structure

This is the Service Manual for the TLS 216 Logic Scope. Before using this manual to service the logic scope, please read all topics in this preface. Also, read the introduction that follows this preface, as it describes the strategy (module replacement) used to service this product.

This manual is divided into sections, such as Specifications and Theory of Operation. Further, it is divided into subsections, such as Product Description and Removal and Installation Procedures.

The following is a brief description of each manual section. H Specifications — contains a product description of the logic scope and

tables of the characteristics and descriptions that apply to it.

H Operating Information — includes installation and operating instructions

at the level needed to safely power on and service this logic scope. Instructions for shipment of the logic scope are also found in this section.

H Theory of Operation — contains circuit descriptions that support general

service and fault isolation.

H Performance Verification — contains a collection of procedures for

confirming that this logic scope functions properly and meets warranted limits.

H Adjustment Procedures — contains a collection of procedures for adjusting

this Logic Scope to meet warranted limits.

H Maintenance — contains information and procedures for doing preventive

and corrective maintenance of this logic scope. Instructions for cleaning, for module removal and installation, and for fault isolation to a module are found here.

H Options — contains information on servicing any of the factory-installed

options that may be present in your logic scope.

H Electrical Parts List — contains a statement referring you to Replaceable

Parts, where both electrical and mechanical modules are listed. See below.

H Diagrams — contains a block diagram and an interconnection diagram

useful for isolating failed modules.

TLS 216 Service Manual

xiii

Preface

Conventions

H Mechanical Parts List — includes a table of all replaceable modules, their

descriptions, and their Tektronix part numbers.

This manual uses certain conventions which you should become familiar with before doing service.

Modules

Safety

Symbols

This manual refers to any replaceable component, assembly, or part of this logic scope 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, each chassis part of the logic scope is a module.

Symbols and terms related to safety appear in the Safety Summary found at the beginning of this manual.

Besides the symbols related to safety, this manual uses the following symbols:

STOP. The STOP label appears with information that must be read in order to correctly do service and to avoid incorrectly using or applying service procedures.

The clock icon labels procedure steps which require a pause to wait for the logic scope 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.

Operating Instructions

xiv

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

H Names of front-panel controls and menu labels appear in boldface print. H Names also appear in the same case (initial capitals, all uppercase, etc.) in

the manual as is used on the logic scope front panel and menus. Front panel

names are all upper case letters, for example, GROUP MENU and

GROUP 1. H Instruction steps are numbered. The number is omitted if there is only one

step.

TLS 216 Service Manual

Preface

H When steps require that you make a sequence of selections using front-panel

controls and menu buttons, an arrow ( ➞ front panel button and a menu, or between menus. Also, whether a name is a main menu or side menu item is clearly indicated: Press HORIZONTAL

MENU Trigger Position (main) ➞ Set to 20% (side).

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

1. Press the front-panel button HORIZONTAL MENU.

2. Press the main menu button Record Length.

3. Press the side menu button 500 points in 10 divs.

4. Press the main menu button Trigger Position

5. Press the side menu button Set to 20%

➞ Record Length (main) ➞ 500 points in 10 divs (side) ➞

) marks each transition between a

Related Manuals

Sometimes you may have to make a selection from a popup menu: Press

TRIGGER MENU

repeatedly press the main menu button Type until Edge is highlighted in the pop-up menu.

The following documents are related to the use or service of the logic scope. The TLS 216 User Manual contains a tutorial to quickly show you how to

operate the logic scope and an in depth discussion of how to more completely use its features. Applications are also discussed.

The TLS 216 Programmer Manual (Tektronix part number 070-8835-00) describes using a computer to control the logic scope through the GPIB interface.

The TLS 216 Reference (Tektronix part number 070-8833-00) gives you a quick overview of how to operate your logic scope.

➞ Type (main) ➞ Edge (pop-up). In this example, you

TLS 216 Service Manual

Preface

xvi

TLS 216 Service Manual

Introduction

Before Servicing

This introduction describes what you should do before attempting servicing of the TLS 216 Logic Scope, outlines the strategy for servicing that this manual supports, and lists service that you can obtain from Tektronix.

This manual is for servicing the TLS 216 Logic Scope. To prevent injury to yourself or damage to the logic scope, do the following before you attempt service:

H Be sure you are a qualified service person; H Read the Safety Summary and Preface found at the beginning of this manual; H Read Strategy for Servicing, below, and Installation in Section 2.

When using this manual for servicing, be sure to heed all warnings, cautions, and notes.

When performing any procedure, be sure to read any introduction it may provide. These introductions provide information needed to do the service safely, correctly, and efficiently.

Strategy for Servicing

TLS 216 Service Manual

NOTE. Throughout this manual, any field-replaceable component, assembly, or part of this logic scope is referred to generically as a module.

This manual contains all the information needed for periodic maintenance of the logic scope. (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 fresh unit obtained from the factory.

All modules are listed in Section 10, Mechanical Parts List. To isolate a failure to a module, use the fault isolation procedures found in Section 6, Maintenance

Information. To remove and replace any failed module, follow the instructions in Removal and Installation Procedures, also found in Section 6.

xvii

Introduction

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 logic scope. 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

Repair or Calibration

Service

Tektronix warrants this product for three years from date of purchase, excluding probes for which the warranty is one year. (The warranties appear following the title page and copyright page near the front of this manual.) Tektronix technicians provide warranty service at most Tektronix service locations worldwide. Your Tektronix product catalog lists all service locations worldwide.

The following services may be purchased to tailor repair and/or calibration of your TLS 216 Logic Scope to fit your requirements.

Option 9C. When you order your TLS 216 Logic Scope with Option 9C, it is shipped with a Certificate of Calibration and Test Data Report. This certificate provides traceability to the National Institute of Standards and Technology (NIST). It certifies procedures used to calibrate the logic scope comply with U. S. Military Standard 45662A.

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.

xviii

H Annual maintenance agreements that provide for either calibration and repair

or calibration only of the logic scope. Of these services, the annual maintenance agreement offers a particularly

cost-effective approach to service for many owners of the TLS 216 Logic Scope. 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 logic scope is out of service when calibration or repair is required.

TLS 216 Service Manual

Introduction

Self Service

Tektronix supports repair to the module level by providing Module Exchange and Module Repair and Return.

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 center. It is not updated to match current modules of the same type. Again, each module comes with a 90-day service warranty.

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.

TLS 216 Service Manual

xix

Introduction

TLS 216 Service Manual

Performance Verification

Product Description

The Tektronix TLS 216 Logic Scope is a superb tool for analyzing and debugging digital circuits. Its performance addresses the needs of digital designers and troubleshooters of such circuits with the following features:

H sixteen channels, equipped with sixteen 2.5 pF FET probes, for acquiring

waveforms from digital circuits

H three display modes — displays analog waveforms, digital BusForms, and

dual-threshold timing diagrams

H four threshold level presets based on four logic families, TTL, CMOS,

+ECL, and –ECL, for deriving digital levels for BusForm diagram displays

H five trigger types — Edge, Pulse, Pattern, State, and Sequence H 500 MHz maximum bandwidth, a 2 Gigasamples/second maximum

digitizing rate, eight-bit digitizers, and up to a 2,000-sample record length per channel

H full GPIB software programmability and hardcopy output using GPIB,

RS-232, or Centronics ports

H complete measurement and documentation capability H intuitive operation using graphic icons and the more familiar and traditional

horizontal and vertical knobs

H on-line help at the touch of a button

and timing

TLS 216 Service Manual

1–1

Product Description

1–2

TLS 216 Service Manual

W arranted Characteristics

This subsection lists the various warranted characteristics that describe the

TLS 216, including both electrical and environmental characteristics.

Warranted characteristics are quantifiable performance limits that are warranted.

NOTE. In these tables, those warranted characteristics that are checked (either directly or indirectly) in the Performance Verification, found in Section 1, appear in boldface type under the column Name.

Performance Conditions

The electrical characteristics found in these tables of warranted characteristics apply when the +20_ C and +30_ C, has had a warm-up period of at least 20 minutes, and is operating at an ambient temperature between +4_ C and +50_ C (unless otherwise noted), and has passed both the signal path compensation and probe calibration routines.

TLS 216 has been adjusted at an ambient temperature between

T able 1–1: Warranted Characteristics: Input System

Name Description Input Resistance with Coaxial Adapter 50  ±1%

Input Resistance with P6240 Probe 1 M ±15% at DC Input Dynamic Range with Coaxial Adapter ±5 V (DC + Peak AC). Input Dynamic Range with P6240 Probe +15 V to –12 V (DC + Peak AC). Maximum Input Voltage with Coaxial Adapter ±5 V (DC + Peak AC). Maximum Input Voltage with P6240 Probe ±25 V (DC + Peak AC). Maximum Input Voltage (Instrument Front Panel) ±5 V (DC + Peak AC).

T able 1–2: W arranted Characteristics: Signal Acquisition System

Name Description DC Gain Accuracy with P6240 Probe ±1.5% for time base settings of 50 mV/Div to 2 V/Div. DC Gain Accuracy with Coaxial Adapter ±4.0% for time base settings of 50 mV/Div to 2 V/Div.

TLS 216 Service Manual

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Warranted Characteristics

T able 1–2: W arranted Characteristics: Signal Acquisition System (Cont.)

Name Description DC Voltage Measurement Accuracy, Averaged, with

Coaxial Adapter

DC Voltage Measurement Accuracy, Averaged, with P6240 Probe

DC Voltage Measurement Accuracy, Not Averaged, with Coaxial Adapter

DC Voltage Measurement Accuracy, Not Averaged, with P6240 Probe

Offset Accuracy V/Div Setting Offset Accuracy

For an average of 16 waveforms:

±(4.0% × | reading – Offset | + Offset Accuracy + (0.06 Div x V/Div))

Delta Volts between any two averages of 16 waveforms acquired under the same setup and ambient conditions:

±(4.0% × | reading | + (0.1 Divs x V/Div) + 0.3 mV)

For an average of 16 waveforms:

±(1.5% × | reading – Offset | + Offset Accuracy + (0.06 Div x V/Div))

Delta Volts between any two averages of 16 waveforms acquired under the same setup and ambient conditions:

±(1.5% × | reading | + (0.1 Divs x V/Div) + 0.3 mV)

Any sample:

±(4.0% × | reading – Offset | + Offset Accuracy + (0.13 Divs x V/Div) + 0.6 mV)

Delta Volts between any two samples acquired under the same setup and ambient conditions:

±(4.0% × | reading | + (0.26 Divs x V/Div) + 1.2 mV)

Any sample:

±(1.5% × | reading – Offset | + Offset Accuracy + (0.13 Divs x V/Div) + 0.6 mV)

Delta Volts between any two samples acquired under the same setup and ambient conditions:

±(1.5% × | reading | + (0.26 Divs x V/Div) + 1.2 mV)

50 mV/Div to 499 mV/Div 2% of of fset ± .3 Divs x V/Div

500 mV/Div to 2 V/Div 2% of offset ± .2 Divs x V/Div

Analog Bandwidth with P6240 Probe or Coaxial Adapter Limits given for an ambient temperature range of 0_ C to +30_ C.

Derate upper bandwidth frequencies by 5.0 MHz for each _ C above +30_ C.

V/Div Setting 200 mV/Div to 2 V/Div DC to 500 MHz 100 mV/Div to 199 mV/Div DC to 450 MHz 50 mV/Div to 99.9 mV/Div DC to 350 MHz

Delay Between Channels with Coaxial Adapter 200 ps for any two channels with equal V/Div settings.

1–4

Bandwidth

TLS 216 Service Manual

Warranted Characteristics

T able 1–2: W arranted Characteristics: Signal Acquisition System (Cont.)

Name Description Delay Between Channels with P6240 Probe v500 ps for any two channels with equal V/Div settings.

Cross T alk (Channel Isolation) w100:1 at 100 MHz and w30:1 at the rated bandwidth for the

sensitivity rating of the channel, for any two channels having equal V/Div settings.

T able 1–3: Warranted Characteristics: Time Base System

Name Description Sample Rate and Delay Time Accuracy "100 ppm over any interval w1 ms. Seconds/Div Time Base Accuracy "100 ppm over any interval w1 ms. Delta Time Measurement Accuracy Conditions T ime Measurement Accuracy

Single shot sample mode, ±(1 WI1 + 100 ppm × | Reading | + 20 MHz Bandwidth selected 1.1 ns)

Repetitive, w8 averages, ±(1 WI bandwidth selected 180 ps)

The Waveform Interval (WI) is the time between the samples in the waveform record.

+ 100 ppm × | Reading | +

T able 1–4: Warranted Characteristics: Triggering System

Name Description Edge Trigger Accuracy Any channel: 0.50 Divs from DC to 50 MHz, increasing to 3.0 Divs

at 500 MHz.

Pulse-, Sequence-, or Pattern-Type Trigger Time Accuracy (Single Channel)

Pulse-, Sequence-, or Pattern-Type Trigger T ime Accuracy (Multiple Channels)

Pulse-, Sequence-, or Pattern-Type Trigger Minimum T ime Interval 500 ps. Edge-Type T rigger Minimum Pulse Width 800 ps. Pulse-Type Trigger Rearm Time 2.5 ns. Pulse-Type T rigger Minimum Pulse Width 2.0 ns. Pattern-Type T rigger Minimum Pattern Width 4.0 ns.

Width or Limit Setting Trigger Time Accuracy

2.4 ns to 35 ns ±(5% of setting + 0.5 ns) 35 ns to 1 ms ±(10% of setting + 0.5 ns)

1.02 ms to 1 s ±(.01% of setting +50 ns) Width or Limit Setting Trigger Time Accuracy

2.4 ns to 35 ns ±(5% of setting + 2.5 ns) 35 ns to 1 ms ±(10% of setting + 2.5 ns)

1.02 ms to 1 s ±(.01% of setting +50 ns)

TLS 216 Service Manual

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Warranted Characteristics

T able 1–4: Warranted Characteristics: Triggering System (Cont.)

Name Description

Pattern-Type T rigger Rearm T ime 4.5 ns. Sequence-T ype Trigger Rearm Time 4.5 ns. Sequence-T ype T rigger Minimum Pulse Width 4.0 ns. State-Type Trigger Setup and Hold Times Setup: 4.0 ns; hold time: 4.0 ns. Trigger Threshold Accuracy ±2% of (threshold setting – offset setting) + 0.2 Divs +

offset accuracy

Auxiliary Trigger Input Sensitivity DC to 50 MHz input frequency with V

= 0.8 V.

IN(LO)

= 2.0 V and

IN(HI)

T able 1–5: Warranted Characteristics: Output Ports and Power Distribution System

Name Description Main and Delayed Trigger Output Logic Levels Logic-High (V

): 2.5 V open circuit, 1.0 V into a 50 

OUT(HI)

load to ground. Logic-Low (V

): 0.7 V into a load of 4 mA; 0.25 V

OUT(LO)

into a 50  load to ground.

Source Voltage 90 to 250 VAC

, continuous range.

RMS

Source Frequency 47 Hz to 440 Hz. Power Consumption 350 W. Probe Compensator Output Voltage and Frequency Output voltage: 0.5 V (base to top) ±2% into a 50  load;

frequency: 1 kHz ±5%.

T able 1–6: Warranted Characteristics: Environmental

Name Description

Temperature (Operating and Nonoperating)

Electrostatic Discharge Susceptibility Up to 8 kV with no change to control settings, or impairment of

Operating: +4_ C to +50_ C. Nonoperating: –22_ C to +60_ C

normal operation; up to 15 kV with no damage that prevents recovery of normal operation by the user.

1–6

TLS 216 Service Manual

Warranted Characteristics

T able 1–6: W arranted Characteristics: Environmental (Cont.)

Name Description

Emissions The instrument meets or exceeds the EMC requirements of the

following standards:

Vfg. 243/1991 Amended per Vfg. 46/1992 FCC Code of Federal Regulations, 47 CFR, Part 15,

Subpart B, Class A

Third Party Certification UL: 1244, Ninth Edition

CSA: C22.2 No. 231-M89

TLS 216 Service Manual

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Warranted Characteristics

1–8

TLS 216 Service Manual

Typical Characteristics

This subsection contains tables that list the various typical characteristics that describe the TLS 216 Logic Scope.

Typical characteristics describe typical or average performance. Typical characteristics are not warranted.

T able 1–7: Typical Characteristics: Input System

Name Description

Input Resistance (Instrument Front Panel) 75 W  ±1% at DC Probe Input Capacitance 2.5 pF maximum.

T able 1–8: Typical Characteristics: Signal Acquisition System

Name Description

Effective Bits For a 9-division (peak-to-peak) sine wave output:

Output Frequency 98 MHz 5.5 bits 245 MHz 5.0 bits

490 MHz 4.5 bits Input Current 60 mA at an ambient temperature 30_ C. Step Response Rise Time V/Div Setting Rise Time

50 mV/Div to 99.9 mV/Div 1.0 ns

100 mV/Div to 199 mV/Div 900 ps

200 mV/Div to 2 V/Div 800 ps Step Response Settling Time with Coaxial Adapter V/Div ±Step Settling Error at

Setting

50 mV/Div to 5.0 V 0.5% 0.2% 0.1%

99.9 mV/Div

100 mV/Div to 5.0 V 1.0% 0.5% 0.2%

199 mV/Div

200 mV/Div to 5.0 V 1.0% 0.5% 0.2%

2 V/Div

Response 20 ns 100 ns 20 ms

2 GS/s Sample Rate

TLS 216 Service Manual

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Typical Characteristics

T able 1–9: Typical Characteristics: Triggering System

Name Description

Trigger Position Accuracy (All Types) Acquisition Mode Accuracy

Sample or Average ±(1 WI

Envelope ±(2 WI Edge-Type Trigger Jitter 0.5 ns peak-to-peak for 100 records. Pulse-, Pattern-, State-, or Sequence-Type Trigger Sensitivity 1.0 Div from DC to 200 MHz, with a minimum slew rate of

25 Divs/ms at the trigger level threshold. Pulse-, Pattern-, or Sequence-Type Trigger T ime Range and

Resolution

Range: 2.4 ns to 1 s.

Time Range

2.4 ns to 10 ns 0.2 ns

10.5 ns to 20 ns 0.5 ns

21 ns to 50 ns 1 ns

52 ns to 100 ns 2 ns

+ 1.5 ns)

Time Resolution

104 ns to 200 ns 4 ns

210 ns to 500 ns 10 ns

520 ns to 1 s 20 ns Trigger Holdoff Range 0.5 ns to 10 s. “Set Trigger Level to 50%” Minimum Operable Frequency 50 Hz. Delayed Trigger Time Range 16.5 ns to 250 ns at 10 ms or faster; 15.152 ns to 250 s at 25 ms

or slower. Delayed Trigger Events Range 2 to 10 million events. Auxiliary Trigger Input Logic Levels V

= 2.0 V and V

IN(HI)

IN(LO)

= 0.8 V.

Auxiliary Trigger Input Characteristics Input is TTL compatible.

The Waveform Interval (WI) is the time between the samples in the waveform record.

T able 1–10: Typical Characteristics: Display and Data Handling Systems

Name Description

Video Display Resolution 640 pixels horizontally by 480 pixels vertically in a display area of

12.8 cm (5.04 in.) horizontally by 9.6 cm (3.78 in.) vertically.

Nonvolatile Memory Capacity Reference waveforms (4), stored setups (10), and calibration

constants are retained in nonvolatile memory. Nonvolatile Memory Retention Time 5 years. Floppy Disk Drive 3.5” floppy disk, 1.44 Mbyte, DOS 4.0 format for storing

waveforms, hard copies, and instrument setups.

1–10

TLS 216 Service Manual

T able 1–11: T ypical Characteristics: Operating Environment

Name Description

Typical Characteristics

Humidity (Operating and Nonoperating)

Altitude (Operating and Nonoperating)

Random Vibration (Operating and Nonoperating)

Nonoperating:

to 90% relative humidity from –22_ C to +40_ C to 50% relative humidity from –22_ C to +50_ C

Operating:

to 80% relative humidity from +4_ C to +29_ C to 20% relative humidity from +4_ C to +50_ C

Operating: to 4570 m (15,000 ft.). Nonoperating: to 12190 m (40,000 ft.).

Operating: 0.31 g Nonoperating: 3.04 g

from 5 to 500 Hz, 10 minutes each axis

RMS

from 5 to 500 Hz, 10 minutes each axis.

RMS

TLS 216 Service Manual

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Typical Characteristics

1–12

TLS 216 Service Manual

Nominal Traits

This subsection contains a collection of tables that list the various nominal traits that describe the TLS 216, including both electrical and mechanical traits.

Nominal traits are described using simple statements of fact such as “16, all identical” for the trait “Input Channels, Number of,” rather than in terms of limits that are performance requirements.

T able 1–12: Nominal Traits: Input System

Name Description

Input Probe Type Tektronix P6240 only. Input Coaxial Adapter Type T ektronix part number 013–0282–00. Probe Input Coupling DC. Input Probe Connector Type Amp Inc. Amplimite coax Mix, Amp part number 750019–1.

Mates with Amp part number 750020–1.

T able 1–13: Nominal Traits: Signal Acquisition System

Name Description

Input Channels, Number of 16, all identical; identified as Ch1, Ch2,... Ch16. Input Coupling DC only. Samplers, Number of 16, all identical; one per channel. Digitized Bits, Number of 8 bits. V/Div Gain Sensitivity Settings 50 mV/Div to 2 V/Div in a 1–2–5 sequence. V/Div Fine Gain Range and Resolution Range: adjustable between the V/Div step gain setting and the

next lower step gain setting.

Resolution: 1% of the lower step gain setting. Offset Voltage Range and Resolution Range: +15 V to –12 V. Resolution: 5 mV. Position Range ±5 divisions. Position Accuracy 0.1 divisions. Analog Bandwidth Selections 20 MHz and FULL (500 MHz) bandwidth.

TLS 216 Service Manual

1–13

Nominal Traits

T able 1–14: Nominal Traits: Time Base System

Name Description

Seconds/Division Range 0.5 ns/div to 5 s/div .

Seconds/Division Step Settings Sample-Rate Range, Real-Time Sample-Rate Range, Interpolated Record Length Selection 500 samples, 1000 samples, 2000 samples.

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.

0.5 ns/Div to 5 s/div in a 1–2.5–5 sequence.

10 Samples/s to 2 GS/s on 16 channels simultaneously. 5 GSamples/s to 100 GSamples/s.

T able 1–15: Nominal Traits: Triggering System

Name Description

Trigger Threshold Range and Resolution (Any Trigger Source)

Line Trigger Level 0 V . Triggers at all 0 volt crossings regardless of whether positive

Range: ±10 Divs; Resolution: 0.02 Divs.

going or negative going.

T able 1–16: Nominal Traits: Display System

Name Description

Contrast Ratio > 100:1. Waveform Display Graticule Single Graticule: 401 × 501 pixels, 8 ×10 divisions, where

divisions are 1 cm by 1 cm

Waveform Display Color Scale 16 colors in infinite persistence and variable persistence display

styles.

T able 1–17: Nominal Traits: GPIB Interface and Output Ports

Name Description

Video Output, VGA DB-15 rear panel video connector, noninterlaced; levels comply

with ANSI Standard R5343A. GPIB Interface GPIB interface complies with IEEE Std 488-1987. RS-232 Interface RS-232 interface complies with EIA/TIA 574. Centronics Interface Centronics interface complies with Centronics interface standard

C332-44 Feb 1977, REV A.

1–14

TLS 216 Service Manual

T able 1–18: Nominal Traits: Fuse Rating

Name Description

Fuse Rating Either of two fuses may be used.

0.25I × 1.25I (UL 198.6, 3AG): 6 A FAST, 250 V. 5 mm × 20 mm (IEC 127): 5A (T), 250 V .

T able 1–19: Nominal Traits: Mechanical

Name Description

Weight 12.3 kg (29 lbs) with front cover.

24.7 kg (54 lbs), when packaged for shipment.

Dimensions Height: 193 mm (7.6 in) with the feet installed.

Width: 445 mm (17.5 in), with handle.

Nominal Traits

Depth: 434 mm (17.1 in), with front cover installed. Cooling Method Forced-air circulation with no air filter. Finish Type Tektronix Blue vinyl-clad material on an aluminum cabinet. Construction Material Chassis parts constructed of aluminum alloy; front panel

constructed of plastic laminate; circuit boards constructed of glass

laminate. Cabinet is aluminum and is clad in Tek Blue vinyl

material. Weight of Rackmounted Instrument and Rackmount Conversion

Kit

Dimensions of Rackmount Instrument Height: 178 mm (7 in).

2.3 kg (5 lbs) for the rackmount conversion kit only; 3.6 kg (8 lbs)

when packaged for shipment.

12.3 kg (29 lbs) plus weight of rackmount parts for the rack-

mounted instrument (Option 1R).

20.5 kg (54 lbs) when the rackmounted instrument is packaged for

domestic shipment.

Width: 483 mm (19 in).

Depth: 559 mm (22 in).

TLS 216 Service Manual

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Nominal Traits

1–16

TLS 216 Service Manual

Installation

This section contains the information needed to operate the TLS 216 Logic Scope when servicing it. The following topics are included:

H Installation details how to put the logic scope into service. It covers power

requirements, power connection, and operating environment. It also details considerations for applying, interrupting, and removing power and provides instructions for repackaging the logic scope for shipment.

H General Operating Instructions describe how to turn on the logic scope and

how to make basic operational settings from the front panel. It also covers operation of the on-board Help and Status features.

H Operating Instructions for Waveform Groups briefly describe basic

principles for creating waveform groups and how to control them. (The logic scope displays a waveform only as part of a waveform group.)

Supplying Operating Power

CAUTION. Read all information and heed all cautions in this section before connecting the

CAUTION. AC POWER SOURCE AND CONNECTION. The logic scope operates from a single-phase power source. It has a three-wire power cord and two-pole, three-terminal grounding type plug. The voltage to ground (earth) from either pole of the power source must not exceed the maximum rated operating voltage, 250 volts.

Before making connection to the power source, be sure the logic scope suitable two-pole, three-terminal grounding-type plug.

GROUNDING. This logic scope 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.

logic scope to a power source.

has a

TLS 216 Service Manual

2–1

Installation

CAUTION. 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 input or output terminals of the logic scope.

Power Cord Information

A power cord with appropriate plug configuration is supplied with each logic scope. 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 Table 2–2, Power

Cord Identification.

T able 2–1: Power-Cord Conductor Identification

Conductor Color Alternate Color

Ungrounded (Line) Brown Black Grounded (Neutral) Light Blue White Grounded (Earthing) Green/Y ellow Green

2–2

TLS 216 Service Manual

T able 2–2: Power Cord Identification

Plug Configuration Normal Usage Option Number

Installation

North America 115 V

Europe 230 V

United Kingdom 230 V

Australia 230 V

Standard

Operating Voltage

TLS 216 Service Manual

North America 230 V

Switzerland 230 V

This logic scope operates with any line voltage from 90–250 VAC

RMS

with any line frequency from 47–63 Hz. There are two fuses, either of which may be used throughout the line voltage and frequency ranges. (The two fuses are not totally interchangeable as each requires a different fuse cap.)

2–3

Installation

Memory Backup Power

Operating Environment

Operating Temperature

Memory modules with on-board batteries allow the logic scope to retain some types of data upon loss of the AC power source. The stored adjustment constants, saved front-panel settings, current front-panel settings (logic scope status), and waveforms saved in memory are retained.

The on-board batteries of the memory modules have a shelf life of about five years. Partial or total loss of stored settings upon power on may indicate that the memory modules need to be replaced.

The following environmental requirements are provided to ensure proper operation and long logic scope life.

The logic scope can be operated where the ambient air temperature is between 4

_ C and +50_ C and can be stored in ambient temperatures from –22_ C to

+60

_ 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 logic scope is cooled by air drawn in and exhausted through its cabinet side panels by an internal fan. To ensure proper cooling of the logic scope, allow at least two inches clearance on both sides and 3/4 inch on the bottom of the logic scope. (The feet on the bottom of the logic scope provide the required clearance when set on flat surfaces.) The top of the logic scope does not require ventilation clearance.

CAUTION. If air flow is restricted, the may temporarily shut down.

Applying and Interrupting Power

Consider the following information when you power on or power off the logic scope, or when power is interrupted due to an external power failure.

Power On

Upon power on, the logic scope runs its power-on self check. If it passes, the logic scope displays a “passed” status message and a prompt to press CLEAR MENU to continue. If it fails, the logic scope displays a diagnostic log that identifies the area(s) that failed and a prompt to press CLEAR MENU to

internal power supply of the logic scope

2–4

TLS 216 Service Manual

Power Off

Installation

continue. See Section 6, Maintenance, for information on diagnostics and fault isolation.

CAUTION. DO NOT power off the logic scope when either running a signal path compensation or when doing any of the adjustments described in Section 5, Adjustment Procedures. To do so might result in the loss of internally stored adjustment constants.

In general, do not power off the logic scope when doing operations that affect the data types listed in Table 2–3. Wait for the logic scope to finish the operation when doing adjustments, saving waveforms, or saving setups.

Improper power off or unexpected loss of power to the logic scope can result in the following corruptions of non-volatile RAM (NVRAM). The following table describes the messages displayed when power is restored after an abnormal power off.

T able 2–3: Effects of Corrupted Data

Corrupted Data Type Results

Adjustment Constants:

Signal Path Compensation A signal path compensation is required. Voltage Reference A voltage reference adjustment is required

Frequency Response A frequency response adjustment is required

Error Log Errors logged are lost. Reference Waveforms Waveform Lost. Saved Setups Setup Lost.

Repackaging Instructions

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 logic scope dimensions.

If the logic scope is being shipped to a Tektronix Service Center, enclose the following information: the owner’s address, name and phone number of a contact person, type and serial number of the logic scope, reason for returning, and a complete description of the service required.

(Section 5).

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Installation

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.

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TLS 216 Service Manual

General Operating Instructions

This section describes how to turn on the TLS 216 Logic Scope and how to make basic operational settings from the front panel. It also covers operation of the onboard Help and Status features.

Before doing service, read these general operating instructions for servicing the logic scope. They prepare you to follow the operating instructions contained in the service procedures of this manual, such as the front-panel setup instructions required to do the Performance Verification in Section 4 or the Adjustments in Section 5.

NOTE. These instructions are at the level appropriate for servicing the logic scope. The complete operator instructions are found in the TLS 216 User

Manual.

NOTE. Unlike a conventional digitizing oscilloscope, the logic scope displays the waveform it acquires as groups instead of as individual waveforms. For instructions on using groups, see Operating Instructions for Waveform Groups on page 2–15.

Screen Layout

Basic Procedures

How to Power On

TLS 216 Service Manual

See Figure 2–1 to become familiar with the basic layout of the logic scope display and the components within that display.

Read the following procedures to learn how to power on the logic scope and how to use its front panel controls and menus to set logic scope functions.

Push the principal power switch found on the rear panel of the logic scope to the on (1) position, then push the ON/STBY (standby) switch to toggle the Logic Scope into operation.

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General Operating Instructions

CAUTION. The principal power switch at the rear panel is the true power disconnect switch. When connected to a power source and when the principal power switch is on, the internal power supplies and much of the other circuitry

logic scope are energized REGARDLESS of the setting of the ON/STBY

of the switch. The

ON/STBY (standby) switch simply toggles operation on and off.

How to Use Help

Brief status information. General purpose knob readout.

Graticule and waveform

groups

Group reference indicator

Vertical group, horizontal

scale, and trigger type

readouts.

To enter help mode, push the HELP front-panel button. 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.

Position of waveform record relative to the display screen.

Side menu area. Readouts for measurements move here when CLEAR MENU is pressed.

Pop-up menu

Readouts in lower graticule area move here when CLEAR MENU is pressed.

Figure 2–1: Map of Display Functions

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Main menu display area.

TLS 216 Service Manual

General Operating Instructions

How to Display Logic

Scope Status

How to Reset the

Logic Scope

How to Set Functions

from the Front Panel

Push the SHIFT, and then the STATUS front-panel buttons to display the status menu. You will find menu selections that display messages that reflect the state of the acquisition system, the eight waveform groups, and the trigger system.

Before beginning maintenance, you might want to set the controls of the logic scope to their factory defaults. To do so, press the SETUP front-panel button, press Recall Factory Setup in the main menu, and then press OK Confirm Factory Init in the side menu.

The following functions can be set using the front-panel knobs without accessing menus: vertical scale and position, horizontal scale and position, trigger level (Edge and Pulse type trigger only), and run/stop waveform acquisition. To adjust these functions, reset the logic scope as described above, and then do the following steps:

1. Input the waveform source(s) to the input channels (7). (Numbers in

parentheses call out front-panel controls in the illustrations accompanying these instructions.) The channels must be defined to be part of a logic scope waveform group (see How to Create a Waveform Group on page 2–20).

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General Operating Instructions

2. Select the group containing the waveform source(s) using the group buttons (8).

3. Locate the front-panel control and adjust the function to be set:

H To adjust vertical position and scale of the selected group, rotate the vertical

position and scale knobs (1). (The logic scope must be in Analog display mode to vertically size waveforms on screen; see To Select a Group Mode on page 2–23.)

H To adjust horizontal position and scale of the selected group, rotate the

horizontal position and scale knobs (2).

H To stop the logic scope from actively acquiring waveforms, press the button

RUN/STOP (3). Press RUN/STOP again to toggle to actively acquiring.

H To adjust trigger level (edge and pulse trigger type settings only), rotate the

THRESHOLD knob (6) or press the SET LEVEL TO 50% button (6). Level adjustment occurs on the trigger source selected in the trigger menu.

H To force a triggering of an acquisition, press FORCE TRIGGER (5).

How to Set Functions

from Menus

All other functions must be set using menus. To set such functions, do the following steps:

1. Press the button corresponding to the function to be set. (Push SHIFT (4)

before pressing the button if the function to be set is highlighted in blue on the front panel.)

2. 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 TRIGGER 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. Type is currently set to Edge.

3. Select a function from the main menu using the main-menu buttons (12). A

side menu for selecting among that the available settings for that function appears. Example: Push Source (13).

4. Select the setting for the function from the side menu (9) using the sidemenu buttons (11). Example: Push AC (10).

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General Operating Instructions

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 “pops up” a menu to supply additional choices or the side menu displays a field that can be varied to set parameters.

To set a function that uses a pop-up menu, do the following steps:

1. Push a main-menu button to pop up a menu (18) of subfunctions. Note the

upward pointing arrow or triangle in the main menu button. This triangle indicates that a pop-up menu appears when the main button is pushed. Example: Push Type (17).

Note the pop-up menu for Type is set to Edge. All the main-menu buttons to the right of the pop-up menu are labeled with subfunctions of Edge.

2. Pushing the button that popped up the menu (17) toggles through the pop-up menu choices. Example: Repeatedly push Type to toggle through the pop-up menu. Notice the other main-menu button labels change accordingly.

TLS 216 Service Manual

3. Complete the setting of the desired mode by selecting from the main menu and the side menu that results. Example: Push Mode & Holdoff (16), and then push Normal (15).

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General Operating Instructions

Indicates a pop menu

To adjust a function setting appearing in a side menu field, do the following steps: (The examples of possible menu selections in the substeps that follow assume you’ve pushed TRIGGER MENU and set Type to Edge.)

1. Push a main menu button that displays a side menu with a menu item(s) that contains a field (readout) that can be varied. Example: Push Threshold (21).

2. Push the side-menu button labeled with the menu item containing the field to select it for setting. Example: Push Threshold (19).

3. Use the general purpose knob (20) to adjust the field to the trigger level to the setting desired. Example: Turn the knob to –200 mV. Alternately, you could set the level using the keypad. Example: Enter –200, press SHIFT, then press m to set the threshold to –200 mV.

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TLS 216 Service Manual

General Operating Instructions

19 20

      — The general purpose knob is used to control many logic scope functions, such as cursor positioning, display intensities, delay time, gated measurements, number of events, trigger position, holdoff, offset, and 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

may vary numerical readouts, position objects (cursors) on screen, or select 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 2–1 on page 2–8.) This readout always reflects the name and value of the function that the general purpose knob is currently controlling.

H Whenever the general purpose knob assignment is changed, a knob icon

appears immediately to the right 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 Whenever the menu is removed, the general purpose knob is not assigned

and doesn’t control any function. (An exception is the cursor function. If cursors are turned on, removing the menu leaves the knob assigned to

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General Operating Instructions

control the cursors until reassigned by selecting another menu and function that uses the knob.)

H When the SHIFT button is lit, the general purpose knob becomes a coarse

adjustment. When the SHIFT button is not lit, the general purpose knob becomes a fine adjustment.

H The general purpose knob also has a SELECT button. This 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.

    — 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 Color: waveforms, readouts, graticule. 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 Graticule format: type. 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 Section 5, Adjustment Procedures.

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TLS 216 Service Manual

Operating Instructions for W aveform Groups

The TLS 216 Logic Scope receives input signals through its channels, but only displays those signals if the channels receiving them are assigned to waveform groups. This section briefly describes basic principles for creating waveform groups and how to control them.

NOTE. These instructions are at the level appropriate for servicing the logic scope. The complete operator instructions are found in the TLS 216 User Manual.

NOTE. These instructions do not cover the basic principles of operating the front-panel interface. For those instructions, see General Operating Instructions on page 2–7.

Vertical Readout

To determine the composition (first and last channel) of any group displayed, check the Vertical Readout at the bottom of the display. (See Figure 2–2.)

Selected Group

A Group Readout

First Channel

Group Label

Last Channel

Figure 2–2: Vertical Readout Displaying Two Group Readouts

Volts/Div or Group Mode

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Operating Instructions for Waveform Groups

The Vertical Readout includes group readouts. Each group readout lists each group by number and indicates its last and first channel. In addition, the Vertical Readout:

H displays only groups that are defined. H displays the label of the selected group in reverse video. (See Figure 2–2.) H displays OFF in the group readout for any group that is turned off in its

Display Mode menu.

H displays the volts/division setting next to the group label of groups that are

set to Analog mode with all channels in the group displayed. If set to Analog mode with only the selected channel displayed, the word Select replaces the volts/division readout. (See Choosing a Group Display Mode, which begins on page 2–22 for information about group modes.)

H displays the display mode, Bus or Timing, next to the group label of groups

set to BusForm or Timing Diagram modes.

H displays the contents of the group by listing the last and the first channel it

contains.

H displays only one of the two “pages” of live (as opposed to reference) groups

at a time: Group 1 through Group 4 or Group 5 through Group 8, whichever page contains the currently selected group.

H displays the reference group currently selected in the Group More menu. (If

MORE is lighted, the live group readouts are removed from the Vertical Readout.)

How to Adjust the Vertical Setup

To effectively use the vertical controls, consider how they operate with regard to the group display mode (group display modes are described on page 2–22):

H The vertical position, bandwidth, and offset controls operate directly on the

selected group regardless of its display mode: Analog, BusForm, or Timing Diagram.

H The Vertical SCALE knob adjusts the vertical size of a group displayed in

Analog mode on screen.

H Although the Vertical SCALE knob adjusts the scale used by the acquisition

hardware regardless of the group display mode, it does not alter the vertical size on screen of a group displayed in either BusForm or Timing Diagram mode. You set the vertical size directly in divisions of difference between the logic HIGH and LOW values that these two modes display.

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TLS 216 Service Manual

Operating Instructions for Waveform Groups

To Scale and Position

Waveform Groups

To Set Up from the

Vertical Controls Menu

To adjust the vertical scale and position of the selected waveform group, use the following procedure:

1. To vertically scale the selected waveform group, turn the Vertical SCALE

knob. Changing the vertical scale changes the volts per division setting to vertically expand or contract all waveforms in the group. (This knob controls the vertical size of the selected group only if its group display mode is Analog. See page 2–24 for sizing groups set to other modes.)

2. To vertically position the selected group, turn the Vertical POSITION knob.

This knob controls only the selected group and operates independently of the display mode.

NOTE. The instructions in the remainder of this section make use of the convention for procedure steps described in the preface to this manual (see

Conventions on page xiv).

To access the Vertical Controls menu, press GROUP MENU ➞ Vertical Controls (main). (See Figure 2–3.)

Group Reference Indicator

of the Selected Group

Group Reference Indicator

of an Unselected Group

Vertical Readout, Group 1 Selected

Figure 2–3: The Vertical Readout and Vertical Controls Menu

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Operating Instructions for Waveform Groups

Use this menu to set vertical offset and bandwidth (full or limited) of the selected group. You can also change the vertical position to a specific number of divisions from center screen from this menu instead of using the Vertical POSITION knob.

How to Select Groups and Channels

The logic scope applies the control changes you make, such as vertical bandwidth, offset, position, and scale, to the selected group. To make these changes to a group, or to define a group (choose the channels the group contains, its display mode, and so on), you must first select it.

To Select a Group

To select a live waveform group (one that can acquire waveforms as opposed to a reference waveform group that can only store and display them) do the following steps.

1. Press any of group selection buttons GROUP 1 through GROUP 4 on the right side of the display to select any one of groups 1 – 4.

2. Press SHIFT and repeat step 1 to select any one of groups 5 – 8. Note that the labels GROUP 5 through GROUP 8 are shifted functions of the GROUP 1 through GROUP 4 buttons.

When selecting groups, note the following operating characteristics: H The logic scope highlights the selected group. It also displays its group

reference indicator (left of the graticule) and its group readout label in reverse video. (See Figure 2–3.)

H The logic scope creates the group automatically if you select a group not yet

defined. It creates it using the first channel not allocated to another group. It displays it using Analog display mode.

H The logic scope displays all groups except those undefined (deleted) or those

which have their display mode set to Off. (See page 2–19 to learn how to remove and return a group from the display.)

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H The logic scope ignores attempts to select undefined groups when the

defined groups have used up all 16 channels.

H The logic scope lights the LED above the button you press. The LED lights

regardless of whether you select a shifted group (5 – 8) or one that is not shifted (1 – 4). Therefore, if you are not sure which group is selected, look at the group readout. It always indicates the selected group.

H The logic scope does not depend on the selected group to determine its

trigger source. You define the trigger source independently in the Main Trigger menu or Delayed Trigger menu.

TLS 216 Service Manual

Operating Instructions for Waveform Groups

To select a reference waveform group (as opposed to a live waveform group), do the following steps.

1. Press the MORE group selection button. The More Group menu will appear.

2. Press Reference Group (main). Select from Ref1 (side) through Ref4 (side).

NOTE. If references are empty (appear shaded in the Select Ref menu), you cannot display them. If a reference group is turned off in its Display Mode menu, selecting it switches its display mode to Analog, so it is automatically displayed.

To Select a Channel

To Remove a Group from

the Display

The logic scope also applies a limited number of control changes based on the selected channel in the selected group. For example, Autoset, which automatically adjusts control settings based on the signals at its input channels, uses the selected channel to determine the logic scope control setup. Also Measure, the automatic measure feature, takes most automatic measurements on the selected channel.

To designate one channel as the selected channel within the selected group, perform the following steps.

1. Select a live or reference group as previously described.

2. Press Group Definition (main) ➞ Selected Channel (side). Use the general

purpose knob or key pad to designate the selected channel in the group.

To remove a group from display, do the following steps.

1. Press the group selection button (GROUP 1 through GROUP 8) to select

the group you want to remove from the display.

2. Press the GROUP OFF button to remove the currently selected group. To display a group that is turned off, turn it on in the group mode menu:

TLS 216 Service Manual

Press GROUP MENU ➞ Group Definition (main) ➞ Analog, Bus, or Timing Diagram (side).

NOTE. Turning a group off does not make its channels available for including in other groups. Turning off a group that includes a channel providing a trigger source does not turn that channel off as a trigger source. Turning off a group does remove any automated measurements of channels in that group.

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Operating Instructions for Waveform Groups

How to Create a Waveform Group

The logic scope operates on channels and the waveforms they acquire only as individual groups. To perform even basic operations on any waveform, such as displaying, vertically positioning, and vertically scaling it, you must first know how to include it in a group.

To more fully understand what a group is, consider its characteristics. Groups contain one or up to sixteen channels. You must assign a channel to a

group for it to be displayed. See Figure 2–4. Groups use only contiguous channels. For example, a group can contain

channels 5 through 10, but not channels 5 through 8 plus 10. Groups cannot share channels. For example if Group 1 contains channel 10, no

other group can include channel 10. Groups are the objects you display, vertically scale, and vertically position. You

can adjust a single channel like a group if you make it the only channel in a group and adjust that group.

Groups can be displayed in any of three display modes: Analog, BusForm, or Timing Diagram.

CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 CH 7 CH 8 CH 9 CH 10 CH 11 CH 12 CH 13 CH 14 CH 15 CH 16

Groups can have multiple channels (up to 16)

Groups can have one channel

Groups cannot share channels

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Figure 2–4: Groups — Valid and Invalid

TLS 216 Service Manual

Operating Instructions for Waveform Groups

To Define a Group

To define a waveform group, you select the group, specify the channels it contains, and designate one of the channels as the selected channel. To do so, perform the following steps.

1. Press any of group selection buttons GROUP 1 through GROUP 4 on the right side of the display. Or press SHIFT, and then press any of group selection buttons GROUP 5 through GROUP 8. (The MORE selection button allows you to select internally stored Ref groups of saved waveforms for display.)

2. Press Group Definition (main) ➞ First Channel (side). Use the key pad to select the first channel in the group.

3. Press Last Channel (side). Use the key pad to select the last channel in the group.

4. Press Selected Channel (side). Use the key pad to designate the selected channel in the group.

Several operating characteristics can be observed when you perform the steps just listed:

H Selecting a group not yet defined creates the group using a single channel.

The logic scope uses the lowest numbered channel not yet assigned to a group.

To Delete a Group

H When defining a first channel or last channel, the logic scope ignores the

input of any channels belonging to another group.

H Attempting to increase the first channel to a higher numbered channel than

that set for last channel sets both the first and last channels to the higher numbered channel. This operation results in a single channel group.

H Attempting to decrease the last channel to a lower numbered channel than

that set for first channel sets both the first and last channels to the lower numbered channel. This operation results in a single channel group.

You can also increment the first, last, and selected channels by repeatedly pressing their menu button in the side menu after selection.

To delete a group, do the following steps:

1. Press the group selection button (GROUP 1 through GROUP 8) to select the group you want to delete.

2. Press Group Definition (main) ➞ Delete Group (side). The logic scope takes the following actions:

H Removes the group and its vertical readout from the display.

TLS 216 Service Manual

H Removes any automated measurements on channels in the group.

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Operating Instructions for Waveform Groups

H Releases all channels in the group so that they are available for including in

existing groups or new groups you create.

NOTE. Channels selected as trigger sources in the trigger menus continue to be the trigger source regardless of whether it belongs to a group that is displayed, turned off, or deleted (belongs to no group at all).

How to Choose the Group Display Mode

The logic scope displays the waveform groups you define in your choice of three display modes: Analog, BusForm, and Timing Diagram.

Analog displays each waveform in the group as the analog of its input signal. All waveforms in the group have superimposed ground references. (See Figure 2–5.) The logic scope scales Analog groups vertically on screen when you use the Vertical SCALE knob. Also, the group reference indicator for the group (left side of screen) points to the ground reference level for the group in Analog mode if vertical offset is set to zero.

Analog Mode

(Indicator Points To Ground)

BusForm Mode

(Indicator Points To Midlevel)

Timing Diagram Mode

(Indicator Points To Midlevel of

the Last Channel)

Analog mode is the only group display mode that can be switched between a display of all the channels in a group and display of a single channel in a group.

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Figure 2–5: Display Modes

TLS 216 Service Manual

Operating Instructions for Waveform Groups

BusForm displays each waveform in the group as one or more of three digital logic levels defined as HIGH, LOW, or indefinite (between HIGH and LOW). The level of each waveform displayed depends on how the instantaneous level of its input signal compares with two threshold levels that you define.

As with Analog mode, all waveforms in the group have superimposed ground references. (The group reference indicator points to the midlevel for the group instead of the ground level.) However, in BusForm mode the logic scope does not display waveform height in volts/division but as a number of divisions that you specify between the HIGH and LOW levels (group height).

Timing Diagram displays each waveform in the group as one or more of three digital logic levels like BusForm. However, unlike BusForm, the logic scope vertically offsets the ground reference of each waveform, so that the waveforms are separated vertically on screen. (The group reference indicator points to the midlevel of the last channel (highest numbered) included in the group.)

OFF removes the display of all waveforms in the group. Only the waveforms are turned off; the group reference indicator, trigger position, and trigger bar indicators remain on screen. You can select, position, and scale a group regardless of whether it is on or off.

To Select a Group Mode

To Display Only the

Selected Channel

To select a group display mode, do the following steps:

1. Press any of group selection buttons GROUP 1 through GROUP 4 on the right side of the display. Or press SHIFT, and then press any of group selection buttons GROUP 5 through GROUP 8. (The MORE button allows you to select internally stored Ref waveform groups for display and manipulation.)

The selected group is indicated by the lighted LED above each button.

2. Press GROUP MENU ➞ Display (main) ➞ Analog, Bus, Timing Diagram, or OFF (side). (See Figure 2–5.)

For groups displayed in Analog mode, you can remove the display of all but the selected channel. To toggle between a display of all the channels in a group and a display of only the selected channel, do the following steps:

1. Press GROUP MENU ➞ Display (main) ➞ Analog (side).

2. Press Analog (side) again to toggle between the All and Select settings.

Note that the logic scope replaces the volt/division setting with the word Select when you toggle to that setting.

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Operating Instructions for Waveform Groups

To Define Group

Thresholds and Height

If displaying waveform groups in BusForm or Timing Diagram display mode, you must set the display thresholds and group height. To set these parameters for the currently selected group, do the following steps:

1. Press GROUP MENU ➞ Display Thresholds (main).

2. Press Vhigh, min and use the general purpose knob or keypad to set the

voltage level the waveform group must exceed to be displayed as a HIGH.

3. Press Vlow, max and use the general purpose knob or keypad to set the

voltage level the waveform group must not exceed to be displayed as a LOW.

4. Press Display Thresholds (main) ➞ Height in Divs (side) and use the

keypad to set the height of all waveforms in the currently selected group.

NOTE. Although the Vertical Scale knob does not size BusForm and Timing Diagram mode groups on screen, you should set it to a level that displays your digital waveforms properly. For example, if your waveforms are clipped in Analog mode, they will be clipped in BusForm and Timing Diagram modes as well (“Clipping” appears on screen). Adjust the Vertical Scale knob until clipping stops.

To Remove a Group from

the Display

To remove the display of a group, do the following step: Select the group and press the GROUP OFF button. (Alternately, you could set

the display mode to Off in the Display Mode menu.) Removing the display of a group also removes from the display any automated

measurements being made on any waveforms in that group.

To Find More Information

For the complete operator instructions for the logic scope, see the TLS 216 User Manual.

For general operating instructions on operating front-panel controls and menus, see General Operating Instructions on page 2–7 of this section.

For a general description of the logic scope, see Product Description in Section 1 of this manual.

For general instructions for operating the internal diagnostic routines of the logic scope, see on General Operating Instructions page 2–7.

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Theory of Operation

Circuit Description

This section describes the electrical operation of the TLS 216 Logic Scope using the major circuit blocks or modules.

This section has two main parts:

H Logic Conventions describes how logic functions are discussed and

H Module Overview describes circuit operation from a functional-circuit block

Logic Conventions

The TLS 216 Logic Scope 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.

represented in this manual.

perspective.

Module Overview

General

Input Signal Path

Active-low signals are indicated by a tilde prefixed to the signal name (~RESET). Signal names are considered to be either active-high, active-low, or to have both active-high and active-low states.

This module overview describes the basic operation of each functional circuit block as shown in Figure 9-2.

The Tektronix TLS 216 Logic Scope is a 16-channel instrument. Each channel provides a calibrated vertical scale factor. All of the 16 channels can be simultaneously acquired at the maximum digitizing rate of 2 GSamples/sec.

A signal enters the logic scope through a probe attached to a logic scope input connector on the A10 Acquisition board.

Acquisition System — The acquisition system provides 50 inputs and, under control of the processor system, attenuation of input signals. It attenuates/amplifies the input signals, samples them, converts them to digital signals, and

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Circuit Description

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 A14 D1 Bus to the A11 DRAM Processor/Display board. This happens after a waveform acquisition is complete if the digital signal processor in the processor system requests the waveform.

Processor System — The processor system contains a 68020 microprocessor that controls the entire instrument. It includes the firmware. It also includes a GPIB interface. You can reprogram the firmware from a remote controller using the GPIB and an external software package.

The processor also includes a digital signal processor. This signal processor processes each waveform as directed by the system processor. Waveforms and any text to be displayed are passed on to the display system. The A11 DRAM Processor/Display board contains both the processor and display systems.

Voltage Controlled

Oscillator (VCO)

Tube Assembly

Front Panel

Display System — Text and waveforms are processed by different parts of the

display circuitry. The display system sends the text and waveform information to the tube assembly as a video signal. The display system also generates and sends vertical (VSYNC) and horizontal (HSYNC) sync signals to the tube assembly. A VGA-compatible video output is at the rear of the TLS 216.

Master clocks for the acquisition system are generated by the circuitry on the A10 Acquisition board. The circuitry makes up a phased locked loop. The master clock is divided down by the A10 Acquisition circuitry under control of the processor system.

All information (waveforms, text, graticules, and pictographs) is displayed by the A30/31/32 Display system. The A30 Display Driver board generates the high voltages necessary to drive the display tube. It also contains the video amplifier, horizontal oscillator, and the vertical and horizontal yoke driver circuitry.

The processor system sends instructions to and receives information from the Front Panel Processor on the A12 Front Panel board. The Front Panel Processor reads the front-panel switches and potentiometers. Any changes in their settings are reported to the processor system. The Front Panel Processor also turns the LEDs on and off and generates the bell signal.

3–2

Front-panel menu switches are also read by the Front Panel Processor. The processor sends any changes in menu selections to the processor system. The

TLS 216 Service Manual

Circuit Description

ON/STBY switch is one of the menu switches. However, it is not read by the Front Panel Processor, but passes through the A12 Front Panel board and the A11 DRAM Processor/Display board to the low voltage power supply.

The front panel also generates the probe compensation signals SIGNAL and GND.

Rear Panel

Low Voltage Power Supply

Fan

The GPIB connector provides access to stored waveforms, and allows external control of the logic scope.

You can output hardcopies to the GPIB, RS-232 and Centronics ports.

The low voltage power supply is a switching power converter with active power factor control. It supplies power to all of the circuitry in the logic scope.

The principal POWER switch, located on the rear panel, controls all power to the logic scope including the Low Voltage Power Supply. The ON/STBY switch, located on the front panel, also controls all of the power to the logic scope except for part of the circuitry in the Low Voltage Power Supply.

The power supply sends a power fail (~PF) warning to the processor system if the power is going down.

The fan provides forced air cooling for the logic scope. It connects to +25 V from the Low Voltage Power Supply by way of the A11 DRAM Processor/Display module.

TLS 216 Service Manual

3–3

Circuit Description

3–4

TLS 216 Service Manual

Introduction

The entire performance verification procedure includes both the Brief Procedures and the Performance Tests, found later in this section. You may not need to perform all of these procedures, depending on what you want to accomplish.

H To rapidly confirm that the logic scope functions and was adjusted properly,

just do the procedures under Self Tests, which begin on page 4–5. Advantages: These procedures are short, require no external signal sources,

and perform extensive functional and accuracy testing to provide high confidence that the logic scope will perform properly. You can use them as a quick check before making a series of important measurements.

Time Required: Approximately 55 minutes.

H To further check functionality, first do the Self Tests just mentioned; then do

the procedures under Functional Tests that begin on page 4–7. Advantages: These procedures require minimal additional time to perform,

require no additional equipment other than the standard-accessory probes and a floppy disk, and more completely test the internal hardware of the logic scope. You can use them to quickly verify that the primary features of the logic scope are operational.

Option 1S

Time Required: Approximately 45 minutes.

H If you desire a more extensive confirmation of performance, do the

Performance Tests, beginning on page 4–15, after doing the Functional and Self Tests just referenced.

Advantages: These procedures add direct and indirect checking of warranted specifications. They require more time to perform and suitable test equipment. (See Equipment Required beginning on page 4–15.)

Time Required: Approximately 11 hours, 35 minutes.

If you ordered this product as an Option 1S, you must obtain a complete set (16) of probes to do a complete performance verification. (Option 1S substitutes Coax Adapters for the probes normally shipped.) Alternately, you may choose to adapt the procedures as follows:

1. Perform the procedure Self Tests on page 4–5, skipping the test Verify Probe Function and Calibration on page 4–6.

TLS 216 Service Manual

4–1

Introduction

Operating Information

Conventions

2. Skip all of the procedure Functional Tests except for the test Verify the File

System on page 4–13.

3. If you desire a more extensive confirmation of performance, do the

procedure Performance Tests. When doing the Performance Tests, you must also skip the test Check Outputs — Probe Compensator on page 4–51, since that check requires a probe.

If you are not familiar with operating this logic scope, read the TLS 216 Reference or the TLS 216 User Manual. These manuals contain instructions that will acquaint you with the use of the front-panel controls and the menu system.

Throughout these procedures the following conventions apply. H Each test procedure uses the following general format.

Title of Test Equipment Required Time Required Prerequisites Procedure

H Each procedure consists of as many steps and substeps as required to do the

test. Steps and substeps are sequenced as follows:

1. First Step a. First Substep b. Second Substep

2. Second Step

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 menu buttons to the right of the display. “Pop-up menu” refers to a menu that pops up when a main-menu button is pressed.

4–2

TLS 216 Service Manual

Brief Status

Information

Graticule and Waveforms

Waveform Reference

Symbols: Ground Levels

and Waveform Sources

Introduction

H Instructions for making a menu selection will follow this format: FRONT

PANEL BUTTON

➞ Pop-Up (if necessary) ➞ Main Menu Button ➞

Side Menu Button. For example, “Press TRIGGER MENU ➞ T ype: Edge (pop-up)

➞ Source (main) ➞ AC (side).”

Position of Waveform

Record Relative to

the Screen and Display

General Purpose

Knob Readout

Side menu area. Readouts for measurements move here when CLEAR MENU is pressed.

Vertical Scale, Horizontal Scale, and Trigger Level

Readouts

Pop-up Menu

Main menu display area. Readouts

in lower graticule area move here

when CLEAR MENU is pressed.

Figure 4–1: Map of Display Functions

TLS 216 Service Manual

4–3

Introduction

4–4

TLS 216 Service Manual

Brief Procedures

Self Tests

The Self Tests use internal routines to confirm basic functionality and proper adjustment. The standard-accessory probes are the only equipment required.

The Functional Tests use the probe-calibration output at the front panel as a test-signal source to further verify that the logic scope functions properly. The standard accessory probes and a floppy disk are the only equipment required.

These procedures use internal routines to verify that the logic scope functions and was adjusted properly.

Verify Internal Adjustment,

Self Calibration, and

Diagnostics

Equipment Required: None. Time Required: Approximately 40 minutes after warm-up period. Prerequisites: Power on the logic scope and allow a 20 minute warm-up before

doing this procedure.

Procedure:

1. Verify that internal diagnostics pass: a. Press SHIFT; then press UTILITY

Area: All (pop-up). b. Disconnect all input signals and probes from all sixteen channels. c. Press Execute (main) d. Wait. The internal diagnostics do an exhaustive verification of proper

logic scope function. This verification will take up to two minutes. At

some time during the wait, a “clock” icon (shown at left) may appear on

screen. When the logic scope finishes the verification, the resulting

status will appear on the screen. e. Verify that no failures occur.

➞ OK Confirm Run Test (side).

➞ System: Diag/Err (pop-up) ➞

TLS 216 Service Manual

f. Press SHIFT; then press UTILITY g. Verify that the word Pass appears in the main menu under the Voltage

Reference, Frequency Response, and Pulse Trigger menu labels

(See Figure 4–2.)

➞ System: Cal (pop-up).

4–5

Brief Procedures

First, the CAL menu

is displayed.

Second, a signal path

compensation is run and is verified.

Third, the adjustment

sections are verified.

Verify Probe Function and

Calibration

Figure 4–2: Verifying Adjustments and Signal-Path Compensation

h. Press Signal Path (main)

➞ OK Compensate Signal Paths (side).

i. Wait. Signal-path compensation runs in about 16 minutes. While it

progresses, a “clock” icon (shown at left) is displayed on screen.

j. Verify that the word Pass appears under Signal Path in the main menu.

(See Figure 4–2.)

2. Return to regular service: Press CLEAR MENU to exit the system menus.

Equipment Required: Sixteen P6240 probes. Time Required: Approximately 15 minutes.

STOP. If your logic scope was ordered configured as Option 1S, it was shipped without the 16 probes included with the standard configured logic scope. You must have the probes to do the following steps and may wish to skip verification of probe function. Read the information under Option 1S on page 4–1 before continuing.

4–6

TLS 216 Service Manual

Brief Procedures

Procedure:

1. Connect the probes and preset the instrument controls: a. Connect 16 P6240 probes to the logic scope (one to each channel). b. Connect each probe tip to a PROBE CALIBRATION output terminal

(order is not important); ensure correct orientation of each probe (ground pins on the bottom).

Functional Tests

c. Press save/recall SETUP

Confirm Factory Init (side).

2. Run the probe calibration routine on all probes: a. Press GROUP MENU

(side). Use the numeric keypad to set the last channel to 16.

b. Press the main menu button Cal Probes; then press the side menu button

OK Compensate Probes. c. Wait. Calibration of all 16 probes will take about 4 minutes. d. Verify that no failures occur. If a failure occurs, consult the error log

[SHIFT – UTILITY

(main)] to pinpoint the faulty probe.

3. Return to regular service: Press CLEAR MENU to exit the system menus

and disconnect the probes.

The purpose of these procedures is to confirm that the logic scope functions properly. The only equipment required is two standard-accessory probes and a

3.5

I, 720 K or 1.44 Mbyte floppy disk.

➞ Recall Factory Setup (main) ➞ Ok

➞ Group Definition (main) ➞ Last Channel

➞ System: Diag/Err (pop-up) ➞ Error Log

TLS 216 Service Manual

STOP. These procedures verify functions; that is, they verify that the logic scope features operate. They DO NOT verify that they operate within limits.

Therefore, when the procedure calls 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 NOT interpret the quantities given as limits. To check operation within limits, proceed to the Performance Tests, which begin on page 4–15.

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 logic scope to certain default settings before verifying functions. If you make changes to these

4–7

Brief Procedures

settings other than those called out in the procedure you may obtain invalid results. In this case, just redo the procedure from step 1.

STOP. If your logic scope was ordered configured as Option 1S, it was shipped without the 16 probes included with the standard configured logic scope. You must have the probes to do the following steps and may wish skip all the function tests except the last. Read the information under Option 1S on page 4–1 before continuing.

Verify All Input Channels

Equipment Required: Two P6240 probes. Time Required: Approximately 30 minutes. Prerequisites: None. Procedure:

1. Install the test hookup and preset the logic scope controls:

P6240 (Not Connected Yet)

P6240

4–8

Figure 4–3: Test Hookup for Functional Tests

a. Install one probe on channel 1. Connect the probe tip to a PROBE

CALIBRATION signal output on the front panel. Connect the probe tip

of a second probe to a PROBE CALIBRATION signal output, but do not install it yet.

b. Press save/recall SETUP

➞ Recall Factory Setup (main) ➞ Ok

Confirm Factory Init (side).

TLS 216 Service Manual

Brief Procedures

c. Press GROUP MENU

➞ Cal Probes (main) ➞ OK Initialize Probes

(side).

d. Set the vertical SCALE to 500 mV. e. Press SET LEVEL TO 50%. f. Press GROUP MENU

➞ Group Definition (main) ➞ Last Channel

(side). Use the numeric keypad to set the last channel to 16.

2. Verify that all input channels operate: Do the following substeps — test

channel 1 first and then proceed to the other channels. a. Confirm that the following statements are true for the selected channel.

H A square-wave probe-calibration signal about one division in

amplitude is on screen. (See Figure 4–4.)

Selected Channel Shows a

Square-Wave Signal

Other Channels Show DC Baseline

Figure 4–4: Square Wave Calibration and DC Baseline Signals

H The vertical POSITION knob moves all signals up and down the

screen when rotated.

H Turning the vertical SCALE knob counterclockwise decreases the

amplitude of the waveform on screen (this may untrigger the signal), turning the knob clockwise increases the amplitude, and returning the knob to 500 mV returns the amplitude to about one division.

TLS 216 Service Manual

4–9

Brief Procedures

b. Press SHIFT; then press ACQUIRE MENU. Use the side menu to

select, in turn, each of the three acquisition 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 on screen.

(Note that there is noise present on the peaks of the square wave.)

H Envelope mode displays an actively acquiring waveform on screen

with the noise displayed.

H Average mode displays an actively acquiring waveform on screen

with the noise reduced. Now return the instrument to Sample mode.

c. Install the second probe (mentioned in step 1a) on the next channel in

numeric sequence. Leave the first probe installed on channel 1.

Verify the Time Base

d. Press GROUP MENU

➞ Group Definition (main) ➞ Selected

Channel (side). Press the side menu button Selected Channel again if necessary to increment the selected channel to the next channel to be tested.

e. Press SET LEVEL TO 50% as necessary to trigger the signal. f. Repeat substeps a through d until you have verified all sixteen input

channels.

3. Remove the test hookup: Disconnect the probes from the channel inputs and

the probe calibration terminals.

Equipment Required: One P6240 probe. Time Required: Approximately 5 minutes. Prerequisites: None. Procedure:

1. Install the test hookup and preset the logic scope controls: a. Install the probe on channel 1. Connect the probe tip to the PROBE

CALIBRATION signal on the front panel. (See Figure 4–3 on

page 4–8.)

4–10

b. Press save/recall SETUP

➞ Recall Factory Setup (main) ➞ Ok

Confirm Factory Init (side). c. Press SET LEVEL TO 50%. d. Set the vertical SCALE to 500 mV.

TLS 216 Service Manual

Brief Procedures

e. Set the horizontal SCALE to 250 ms. f. Press CLEAR MENU to remove the menus from the screen.

2. Verify that the time base operates: Confirm the following statements. a. One period of the square-wave probe-calibration signal is about four

horizontal divisions on screen.

b. Rotating the horizontal SCALE knob clockwise expands the waveform

on screen (more horizontal divisions per waveform period), counterclockwise rotation contracts it, and returning the horizontal scale to 250 ms returns the period to about four divisions.

c. The horizontal POSITION knob positions the signal left and right on

screen when rotated.

3. Remove the test hookup: Disconnect the probe from the channel input and the probe-calibration terminals.

Verify the Main and

Delayed Trigger Systems

Equipment Required: One P6240 probe. Time Required: Approximately 5 minutes. Prerequisites: None. Procedure:

1. Install the test hookup and preset the logic scope controls: a. Install the probe on channel 1. Connect the probe tip to the PROBE

CALIBRATION signal on the front panel. (See Figure 4–3 on

page 4–8.)

b. Press save/recall SETUP

Confirm Factory Init (side). c. Press SET LEVEL TO 50%. d. Set the vertical SCALE to 200 mV. e. Set the horizontal SCALE for the M (main) time base to 250 ms. f. Press TRIGGER MENU

2. Verify that the main trigger system operates: Confirm that the following

statements are true.

➞ Recall Factory Setup (main) ➞ Ok

➞ Mode & Holdoff (main) ➞ Normal (side).

TLS 216 Service Manual

a. The trigger Threshold readout in the main menu changes with the

trigger THRESHOLD knob.

4–11

Brief Procedures

b. The trigger THRESHOLD knob can trigger and untrigger the square-

wave signal as you rotate it. (Leave the signal untriggered.)

c. Pressing SET LEVEL TO 50% triggers the signal that you just left

untriggered. (Leave the signal triggered.)

3. Verify that the delayed trigger system operates: a. Press HORIZONTAL MENU

➞ Time Base (main) ➞ Delayed

Triggerable (side). b. Press the side-menu button Delayed Only. c. Set the horizontal SCALE for the D (delayed) time base to 250 ms. d. Press SHIFT; then press DELAYED TRIG

➞ Threshold (main) ➞

Threshold (side). e. Confirm that the following statements are true:

H The trigger Threshold readouts in the main and side menus change

as you turn the general purpose knob.

H The general purpose knob can trigger and untrigger the square-wave

signal as you rotate it. (Leave the signal untriggered.)

H Pressing SET LEVEL TO 50% triggers the signal that you just left

untriggered. (Leave the signal triggered.)

f. Press the main-menu button Delay by Time. g. Use the keypad to enter a delay time of 1 second. h. Verify that the trigger READY indicator on the front panel flashes about

once every second as the waveform is updated on screen.

4–12

4. Verify main and delayed triggering for the logic triggers: a. Press HORIZONTAL MENU

➞ Time Base (main) ➞ Main Only

(side).

b. Press TRIGGER MENU

➞ Type: Pattern (pop-up).

c. Verify that the screen shows a triggered square-wave signal. d. Press HORIZONTAL MENU ➞ Time Base (main) ➞ Delayed Only

(side).

e. Verify that the trigger READY indicator on the front panel flashes about

once every second as the waveform is updated on screen.

5. Remove the test hookup: Disconnect the standard-accessory probe from the channel input and the probe calibration terminals.

TLS 216 Service Manual

Brief Procedures

Verify the File System

Equipment Required: One 720 K or 1.44 Mbyte, 3.5

I DOS compatible disk

(formatted).

Time Required: Approximately 5 minutes. Prerequisites: None. Procedure:

1. Preset the logic scope controls: a. Insert the disk in the disk drive to the left of the monitor. b. Press save/recall SETUP

➞ Recall Factory Setup (main) ➞ Ok

Confirm Factory Init (side).

c. Set the horizontal SCALE to 250 ms (one click clockwise). Notice the

horizontal readout now displays 250 ms at the bottom of the screen.

2. Verify the file system works: a. Press save/recall SETUP

➞ Save Current Setup (main) ➞ To File

(side).

b. Turn the general purpose knob to select the file to save. Choose

TEK?????.SET. With this choice, you will save a file starting with TEK,

then containing 5-numbers, and a

.SET extension. For example, the first

time you run this on a blank, formatted disk or on the Example Programs Disk, the logic scope will assign the name

TEK00000.SET to your file.

If you ran the procedure again, the logic scope would increment the name and call the file

TEK00001.SET.

TLS 216 Service Manual

c. Press the side-menu button Save To Selected File. d. Set the horizontal SCALE to 500 ms, and then use the vertical POSI-

TION knob to place the channel 1 baseline trace two divisions above

center screen.

e. Press Recall Saved Setup (main)

➞ From File (side).

f. Turn the general purpose knob to select the file to recall. For example, if

you followed the instructions above and used a blank disk, you had the logic scope assign the name TEK00000.SET to your file.

g. Press the side-menu button Recall From Selected File. h. Verify that the logic scope retrieved the saved setup from the disk. Do

this by noting that the horizontal SCALE again reads 250 ms and the channel 1 baseline waveform is again vertically positioned near center screens as when you saved the setup.

3. Remove the test hookup: Remove the disk from the disk drive.

4–13

Brief Procedures

4–14

TLS 216 Service Manual

Performance Tests

This section contains a collection of procedures for checking that the TLS 216 performs as warranted.

The procedures appear in four logical groupings: Signal Acquisition System

Checks, Time Base System Checks, Triggering System Checks, and Output Signal Checks. They check (either directly or indirectly) all the characteristics that are

designated as checked in the Specifications. (The characteristics that are checked appear in boldface type under Warranted Characteristics beginning on page 1–3.)

Prerequisites

Equipment Required

The tests in this subsection comprise an extensive, valid confirmation of performance and functionality given the following prerequisites:

H The cabinet must be installed on the logic scope. H You must have performed and passed the procedures under Self Tests, found

on page 4–5, and those under Functional Tests, found on page 4–7.

H You must have performed Preparation: Clear Probe Calibrations, found on

page 4–24.

H The logic scope 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 4

_ C and +50_ C. (The warm-up requirement is usually met by

completing the Self Tests and Functional Tests.)

Read General Instructions and Conventions that start on page 4–1 before performing these procedures.

These procedures use external, traceable signal sources to directly check warranted characteristics. Table 4–1 shows the required equipment list.

T able 4–1: Test Equipment

Item Number and Description Minimum Requirements Example Purpose

1. Attenuator,10X (three required) Ratio: 10X; impedance 50 ; connectors: female BNC input, male BNC output

2. Attenuator, 2X Ratio: 2X; impedance 50 ; connectors: female BNC input, male BNC output

Tektronix part number 01 1–0059–02

Tektronix part number 01 1–0069–02

Signal Attenuation

TLS 216 Service Manual

4–15

Performance Tests

T able 4–1: Test Equipment (Cont.)

Item Number and Description PurposeExampleMinimum Requirements

3. Terminator, 50 W Impedance 50 W; connectors: female BNC input, male BNC output

4. Cable, Precision 50 W Coaxial

(three required)

5. Connector, Dual-Banana (two

50 W, 36 in, male to male BNC connectors

Female BNC to dual banana Tektronix part number

required)

6. Connector, BNC “T” Male BNC to dual female BNC T ektronix part number

7. Coupler, Dual-Input Female BNC to dual male BNC Tektronix part number

8. Generator, Calibration Variable amplitude to ±104 V; accuracy to 0.1%

Tektronix part number 01 1–0049–01

Tektronix part number

Signal Termination for Channel Delay Test

Signal Interconnection

012–0482–00

Various Accuracy Tests

103–0090–00

Checking Trigger Sensitiv-

103–0030–00

ity Checking Delay Between

067–0525–02

Channels

Data Precision 8200 Checking DC Offset, Gain,

and Measurement Accuracy

9. Generator , Leveled Sine Wave,

Medium-Frequency

200 kHz to 250 MHz; Variable amplitude from 5mV to 4 V

p-p

into

Tektronix SG 503 Leveled Sine Wave Generator

Checking Trigger Sensitivity at low frequencies

50 W

10. Generator, Leveled Sine Wave,

High-Frequency

250 MHz to 500 MHz; Variable amplitude from 500mV to 4 V 50 W; 6 MHz reference

p-p

Tektronix SG 504 Leveled Sine Wave Generator

into

a TM 500 Series Power

with

Checking Analog Bandwidth and Trigger Sensitiv-

ity at high frequencies Module with SG 504 Output Head

11. Generator, Time Mark Variable marker frequency from 10 ms to 10 ns; accuracy within 2 ppm

12. P6240 Probes, which are a

P6240 probes Tektronix part number

Standard Accessory to this

product

13. Adapter, Coaxial

(two required)

14. Adapter, SMA to BNC

Logic Scope channel input to female SMA adapter

Male SMA to female BNC T ektronix part number

(two required)

If your logic scope was ordered configured as Option 1S, it was shipped without the 16 probes included with the standard

Tektronix TG 501A Time Mark Generator

P6240

Tektronix part number 013–0282–00

015–0554–00

Checking Sample-Rate and Delay-time Accuracy

Signal Interconnection

configured logic scope. Read the information under Option 1S on page 4–1 before continuing.

4–16

Test Record

Photocopy the next 7 pages and use them to record the performance test results for your instrument.

TLS 216 Service Manual

TLS 216 T est Record

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Performance Test Minimum Incoming Outgoing Maximum

Offset Accuracy (Zero Setting)

CH1 Offset –60 mV __________ __________ +60 mV CH2 Offset –60 mV __________ __________ +60 mV CH3 Offset –60 mV __________ __________ +60 mV CH4 Offset –60 mV __________ __________ +60 mV CH5 Offset –60 mV __________ __________ +60 mV CH6 Offset –60 mV __________ __________ +60 mV CH7 Offset –60 mV __________ __________ +60 mV CH8 Offset –60 mV __________ __________ +60 mV CH9 Offset –60 mV __________ __________ +60 mV CH10 Offset –60 mV __________ __________ +60 mV CH1 1 Of fset –60 mV __________ __________ +60 mV CH12 Offset –60 mV __________ __________ +60 mV CH13 Offset –60 mV __________ __________ +60 mV CH14 Offset –60 mV __________ __________ +60 mV CH15 Offset –60 mV __________ __________ +60 mV CH16 Offset –60 mV __________ __________ +60 mV

Performance Tests

DC Gain

CH1 : Reading +480 mV __________ __________ +520 mV CH2 : Reading +480 mV __________ __________ +520 mV CH3 : Reading +480 mV __________ __________ +520 mV CH4 : Reading +480 mV __________ __________ +520 mV CH5 : Reading +480 mV __________ __________ +520 mV CH6 : Reading +480 mV __________ __________ +520 mV CH7 : Reading +480 mV __________ __________ +520 mV CH8 : Reading +480 mV __________ __________ +520 mV CH9 : Reading +480 mV __________ __________ +520 mV CH10 : Reading +480 mV __________ __________ +520 mV CH1 1 : Reading +480 mV __________ __________ +520 mV CH12 : Reading +480 mV __________ __________ +520 mV CH13 : Reading +480 mV __________ __________ +520 mV CH14 : Reading +480 mV __________ __________ +520 mV

TLS 216 Service Manual

4–17

Performance Tests

TLS 216 T est Record (Cont.)

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

DC Gain

CH15 : Reading +480 mV __________ __________ +520 mV CH16 : Reading +480 mV __________ __________ +520 mV

DC Accuracy

MaximumOutgoingIncomingMinimumPerformance Test

CH1 +2.7 V Offset

–2.7 V Offset

CH2 +2.7 V Offset

–2.7 V Offset

CH3 +2.7 V Offset

–2.7 V Offset

CH4 +2.7 V Offset

–2.7 V Offset

CH5 +2.7 V Offset

–2.7 V Offset

CH6 +2.7 V Offset

–2.7 V Offset

CH7 +2.7 V Offset

–2.7 V Offset

CH8 +2.7 V Offset

–2.7 V Offset

CH9 +2.7 V Offset

–2.7 V Offset

CH10 +2.7 V Offset

–2.7 V Offset

CH1 1 +2.7 V Offset

–2.7 V Offset

CH12 +2.7 V Offset

–2.7 V Offset

CH13 +2.7 V Offset

–2.7 V Offset

CH14 +2.7 V Offset

–2.7 V Offset

CH15 +2.7 V Offset

–2.7 V Offset

CH16 +2.7 V Offset

–2.7 V Offset

+2.898 V –2.898 V

__________ __________

+3.102 V –3.102 V

4–18

TLS 216 Service Manual

TLS 216 T est Record (Cont.)

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Analog Bandwidth

CH1 Pk-Pk Reading 848 mV __________ __________ N/A CH2 Pk-Pk Reading 848 mV __________ __________ N/A CH3 Pk-Pk Reading 848 mV __________ __________ N/A CH4 Pk-Pk Reading 848 mV __________ __________ N/A CH5 Pk-Pk Reading 848 mV __________ __________ N/A CH6 Pk-Pk Reading 848 mV __________ __________ N/A CH7 Pk-Pk Reading 848 mV __________ __________ N/A CH8 Pk-Pk Reading 848 mV __________ __________ N/A CH9 Pk-Pk Reading 848 mV __________ __________ N/A CH10 Pk-Pk Reading 848 mV __________ __________ N/A CH1 1 Pk-Pk Reading 848 mV __________ __________ N/A CH12 Pk-Pk Reading 848 mV __________ __________ N/A CH13 Pk-Pk Reading 848 mV __________ __________ N/A CH14 Pk-Pk Reading 848 mV __________ __________ N/A CH15 Pk-Pk Reading 848 mV __________ __________ N/A CH16 Pk-Pk Reading 848 mV __________ __________ N/A

Performance Tests

MaximumOutgoingIncomingMinimumPerformance Test

Delay Between Channels

CH1 and CH2 N/A __________ __________ 200 ps CH1 and CH3 N/A __________ __________ 200 ps CH1 and CH4 N/A __________ __________ 200 ps CH1 and CH5 N/A __________ __________ 200 ps CH1 and CH6 N/A __________ __________ 200 ps CH1 and CH7 N/A __________ __________ 200 ps CH1 and CH8 N/A __________ __________ 200 ps CH1 and CH9 N/A __________ __________ 200 ps CH1 and CH10 N/A __________ __________ 200 ps CH1 and CH11 N/A __________ __________ 200 ps CH1 and CH12 N/A __________ __________ 200 ps CH1 and CH13 N/A __________ __________ 200 ps CH1 and CH14 N/A __________ __________ 200 ps

TLS 216 Service Manual

4–19

Performance Tests

TLS 216 T est Record (Cont.)

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Delay Between Channels

CH1 and CH15 N/A __________ __________ 200 ps CH1 and CH16 N/A __________ __________ 200 ps

Long Term Sample Rate

CH1 –4.0 Div __________ __________ +4.0 Div CH5 –4.0 Div __________ __________ +4.0 Div CH9 –4.0 Div __________ __________ +4.0 Div CH13 –4.0 Div __________ __________ +4.0 Div

Delta Time

MaximumOutgoingIncomingMinimumPerformance Test

C1 Per Reading 19.760 ns __________ __________ 20.240 ns C5 Per Reading 19.760 ns __________ __________ 20.240 ns C9 Per Reading 19.760 ns __________ __________ 20.240 ns C13 Per Reading 19.760 ns __________ __________ 20.240 ns

Logic Triggering

Pulse-Glitch (Main) Generator Readings At:

10 ns 250 ns

2.5 ms

Pulse-Width (Main) Generator Readings At:

10 ns 250 ns

2.5 ms

Pulse-Glitch (Delayed) Generator Readings At:

10 ns 250 ns

2.5 ms

Pulse-Width (Delayed) Generator Readings At:

10 ns 250 ns

2.5 ms

56.2 MHz

2.27 MHz 244 kHz

56.2 MHz

2.27 MHz 244 kHz

56.2 MHz

2.27 MHz 244 kHz

56.2 MHz

2.27 MHz 244 kHz

__________ __________ __________

N/A N/A N/A

4–20

TLS 216 Service Manual

TLS 216 T est Record (Cont.)

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Logic Triggering

Sequence (Main) Generator Readings

Sequence (Delayed) Generator Readings

2.27 MHz __________ __________ N/A

Trigger Threshold

Threshold Readings

Positive Slope Negative Slope

2.54 V

__________ __________

Edge Trigger

Performance Tests

MaximumOutgoingIncomingMinimumPerformance Test

3.46 V

CH1 (50 MHz)

Positive Slope Negative Slope

CH2 (50 MHz)

Positive Slope Negative Slope

CH3 (50 MHz)

Positive Slope Negative Slope

CH4 (50 MHz)

Positive Slope Negative Slope

CH5 (50 MHz)

Positive Slope Negative Slope

CH6 (50 MHz)

Positive Slope Negative Slope

CH7 (50 MHz)

Positive Slope Negative Slope

CH8 (50 MHz)

Positive Slope Negative Slope

CH9 (50 MHz)

Positive Slope Negative Slope

Stable Trigger Stable Trigger

__________ __________

N/A N/A

TLS 216 Service Manual

4–21

Performance Tests

TLS 216 T est Record (Cont.)

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Edge Trigger

CH10 (50 MHz)

Positive Slope Negative Slope

CH1 1 (50 MHz)

Positive Slope Negative Slope

CH12 (50 MHz)

Positive Slope Negative Slope

CH13 (50 MHz)

Positive Slope Negative Slope

CH14 (50 MHz)

Positive Slope Negative Slope

CH15 (50 MHz)

Positive Slope Negative Slope

CH16 (50 MHz)

Positive Slope Negative Slope

AUX Trigger Input

Positive Slope Negative Slope

CH1 (500 MHz)

Positive Slope Negative Slope

CH2 (500 MHz)

Positive Slope Negative Slope

CH3 (500 MHz)

Positive Slope Negative Slope

CH4 (500 MHz)

Positive Slope Negative Slope

CH5 (500 MHz)

Positive Slope Negative Slope

Stable Trigger Stable Trigger

__________ __________

MaximumOutgoingIncomingMinimumPerformance Test

N/A N/A

4–22

TLS 216 Service Manual

TLS 216 T est Record (Cont.)

Instrument Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Edge Trigger

CH6 (500 MHz)

Positive Slope Negative Slope

CH7 (500 MHz)

Positive Slope Negative Slope

CH8 (500 MHz)

Positive Slope Negative Slope

CH9 (500 MHz)

Positive Slope Negative Slope

CH10 (500 MHz)

Positive Slope Negative Slope

CH1 1 (500 MHz)

Positive Slope Negative Slope

CH12 (500 MHz)

Positive Slope Negative Slope

CH13 (500 MHz)

Positive Slope Negative Slope

CH14 (500 MHz)

Positive Slope Negative Slope

CH15 (500 MHz)

Positive Slope Negative Slope

CH16 (500 MHz)

Positive Slope Negative Slope

Stable Trigger Stable Trigger

__________ __________

Performance Tests

MaximumOutgoingIncomingMinimumPerformance Test

N/A N/A

Output Signal Checks

Probe Calibrator Output

Voltage Frequency

Main Trigger Output High ≥1.0 V __________ __________ Low ≤0.25 V Delayed Trigger Output High ≥1.0 V __________ __________ Low ≤0.25 V

TLS 216 Service Manual

490 mV 950 Hz

__________ __________

510 mV 1050 Hz

4–23

Performance Tests

Preparation: Clear Probe Calibrations

Before performing any of the performance checks that follow, you must initialize all channels to remove any previously stored probe calibrations. To do so, perform the following procedure.

Equipment Required: None. Time Required: Approximately 5 minutes. Procedure:

1. Create a 16-channel group: a. Disconnect any input signals and probes from the front panel. b. Press save/recall SETUP

Confirm Factory Init (side).

c. Press GROUP MENU

(side). Use the numeric keypad to set the last channel to 16.

2. Run the probe initialization routine on all probes: Press the main menu button Cal Probes; then press the side menu button OK Initialize Probes.

NOTE. Ignore the message that appears on screen that instructs you to connect probes; installation of probes is only required when compensation of probes is to be performed.

3. Return to regular service: Press CLEAR MENU to exit the system menus.

➞ Recall Factory Setup (main) ➞ OK

➞ Group Definition (main) ➞ Last Channel

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TLS 216 Service Manual

Signal Acquisition System Checks

These procedures check (either directly or indirectly) those characteristics that relate to the signal-acquisition system and are listed as checked under Warranted Characteristics in the Specifications section.

Performance Tests

Check Accuracy of Offset

(Zero Setting)

Equipment Required: None. Time Required: Approximately 20 minutes. Prerequisites: The logic scope must meet the prerequisites listed on page 4–15.

1. Preset the instrument controls: a. Disconnect any input signals from all channels. b. Press save/recall SETUP

Confirm Factory Init (side). c. Set the horizontal SCALE to 1 ms. d. Press SHIFT; then press ACQUIRE MENU

Average 16 (side). e. Press DISPLAY f. Press CURSOR g. Press CLEAR MENU.

2. Confirm input channels are within limits for offset accuracy at zero offset:

Do the following substeps — test channel 1 first and then proceed to the rest of the channels.

➞ Graticule (main) ➞ Frame (side). ➞ Function (main) ➞ H Bars (side).

➞ Recall Factory Setup (main) ➞ OK

➞ Mode (main) ➞

TLS 216 Service Manual

a. Set the vertical SCALE setting to 200 mV. b. Rotate the general purpose knob to superimpose the active cursor over

the baseline DC test level. (Ignore the other cursor.) c. Read the measurement results at the absolute (@:) cursor readout (see

Figure 4–5).

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Performance Tests

inactive cursor.

Align the active cursor to

the DC baseline (no input).

Then read the offset

relative to ground

Ignore the

reference.

Check DC Gain and

Voltage Measurement

Accuracy

Figure 4–5: Measurement of DC Offset Accuracy at Zero Setting

d. Check that the readout indicates an offset between +60 mV and –60 mV. e. Press GROUP MENU

➞ Group Definition (main) ➞ First Channel

(side). Press the side menu button First Channel again if necessary to increment to the next channel to be tested.

f. Press CURSOR; press CLEAR MENU. g. Repeat substeps b through f for all 16 channels. (Substeps e and f will

not be necessary for channel 16.)

Equipment Required: Two dual-banana connectors (Item 5), one BNC T connector (Item 6), one DC calibration generator (Item 8), two precision coaxial cables (Item 4), one coaxial adapter (Item 13), and one SMA to BNC adapter (Item 14).

Time Required: Approximately 3 hours. Prerequisites: The logic scope must meet the prerequisites listed on page 4–15. Procedure:

4–26

1. Install the test hookup and preset the instrument controls: a. Set the output of the DC calibration generator to 0 V.

TLS 216 Service Manual

Dual Banana

to BNC

Adapters

DC Calibrator

Output Sense

Performance Tests

b. Connect the output of the DC calibration generator through a dual-ba-

nana connector followed by a 50  precision coaxial cable to one side of a BNC T connector. See Figure 4–6.

c. Connect the Sense output of the generator through a second dual-banana

connector followed by a 50  precision coaxial cable to the other side of the BNC T connector. Now connect the BNC T connector to channel 1 through the SMA to BNC adapter and a coaxial adapter. See Figure 4–6.

HI LO

Coaxial Adapter

SMA to BNC Adapter

BNC T Connector

Figure 4–6: Test Hookup for DC Gain and Accuracy Tests

d. Press save/recall SETUP

➞ Recall Factory Setup (main) ➞ OK

Confirm Factory Init (side). e. Set the vertical SCALE to 100 mV. f. Press SHIFT; then press ACQUIRE MENU

➞ Mode (main) ➞

Average 16 (side). g. Press DISPLAY h. Press CURSOR

➞ Graticule (main) ➞ Frame (side). ➞ Function (main) ➞ H Bars (side).

2. Confirm input channels are within limits for DC gain accuracy: Do the following substeps — test channel 1 first, then proceed on to the other channels.

a. Press GROUP MENU

➞ Vertical Controls (main) ➞ Offset (side). Use

the keypad to set offset to 250 mV. (Press 250, then press SHIFT m, and then press ENTER.)

TLS 216 Service Manual

b. Set the generator output to 0 V. c. Press CLEAR MENU. Use the general purpose knob to precisely align

the active cursor to the DC baseline level on screen.

4–27

Performance Tests

First, align a cursor to the

DC baseline (no input).

Second, align the other

cursor to the DC test

level that you input.

d. Set the generator output to 500 mV. e. Press SELECT. Use the general purpose knob to precisely align the

alternate cursor to the 500 mV DC test level on screen.

f. Read the measurement results from the delta () readout, not the

absolute (@:) readout. (See Figure 4–7.) Check that the : readout on screen is between 480 mV and 520 mV

Third, read the results of

the DDC measurement

here.

Figure 4–7: Measurement of DC Gain Accuracy

g. Press GROUP MENU

➞ Group Definition (main) ➞ First Channel

(side). Press the side menu button First Channel again if necessary to increment to the next channel to be tested.

h. Set the generator output to 0 V. i. Move the test hookup to the channel you select. j. Repeat substeps c through i for all 16 channels. (Substeps g through i

will not be necessary for channel 16.)

3. Reestablish the initial test setup: a. Set the generator output to 0 V.

4–28

b. Move the test hookup back to channel 1.

TLS 216 Service Manual

Tektronix TLS 216 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Service Manual

Table of Contents

Specification

Operating Information

Theory of Operation

Performance Verification

Adjustment Procedures

Maintenance

Options

Electrical Parts List

Diagrams

Mechanical Parts List

List of Figures

List of Tables

Service Safety Summary

Preface

Manual Structure

Conventions

Related Manuals

Introduction

Before Servicing

Strategy for Servicing

Tektronix Service

Product Description

W arranted Characteristics

Performance Conditions

Typical Characteristics

Nominal Traits

Installation

Supplying Operating Power

Operating Environment

Applying and Interrupting Power

Repackaging Instructions

General Operating Instructions

Screen Layout

Basic Procedures

Operating Instructions for W aveform Groups

Vertical Readout

How to Adjust the Vertical Setup

How to Select Groups and Channels

How to Create a Waveform Group

How to Choose the Group Display Mode

To Find More Information

Circuit Description

Logic Conventions

Module Overview

Introduction

Option 1S

Operating Information

Conventions

Brief Procedures

Self Tests

Functional Tests

Performance Tests

Preparation: Clear Probe Calibrations

Signal Acquisition System Checks