Tektronix VITS100 User Manual

Instruction Manual

VITS100 NTSC VITS Inserter

070-8333-02

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 all safety summaries prior to performing service.

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.

WARRANTY

T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If a 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; c) to repair any damage or malfunction caused by the use of non-T ektronix supplies; or d) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REP AIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Service Assurance

If you have not already purchased Service Assurance for this product, you may do so at any time during the product’s warranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs.

Repair Protection extends priority repair services beyond the product’s warranty period; you may purchase up to three years of Repair Protection.

Calibration Services provide annual calibration of your product, standards compliance and required audit documentation, recall assurance, and reminder notification of scheduled calibration. Coverage begins upon registration; you may purchase up to five years of Calibration Services.

Service Assurance Advantages

H Priced well below the cost of a single repair or calibration H Avoid delays for service by eliminating the need for separate purchase authorizations from your company H Eliminates unexpected service expenses

For Information and Ordering

For more information or to order Service Assurance, contact your T ektronix representative and provide the information below . Service Assurance may not be available in locations outside the United States of America.

Name VISA or Master Card number and expiration Company date or purchase order number Address Repair Protection (1,2, or 3 years) City , State, Postal code Calibration Services (1,2,3,4, or 5 years) Country Instrument model and serial number Phone Instrument purchase date

Getting Started

Operating Basics

Specifications

General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Safety Summary ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VITS Inserter Functions 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessories and Options 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Check and Installation 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear Panel 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Insertion Options 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VITS Selection 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Control 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specification T ables 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Waveform Diagrams 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Theory of Operation

Functional Description 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Circuit Description 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification

Incoming Inspection Test 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verification of T olerance Values 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verification Procedure 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedure

Static Discharge Precautions 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recommended T est Equipment 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedure 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance

Service Strategy 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ektronix Service Offerings 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Static Sensitive Components 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Circuit Board Jumpers 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VITS100 NTSC VITS Inserter Instruction Manual

Table of Contents

Cleaning and Inspection 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal and Replacement Instructions 7–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostics 7–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Electrical Parts

Parts Ordering Information 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Replaceable Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagrams

A1 VITS Inserter Board (671-2132-05 & Up) 9–1. . . . . . . . . . . . . . . . . . . .

A1 VITS Inserter Board (671-2132-00 through -04) 9–23. . . . . . . . . . . . . .

Replaceable Mechanical Parts

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

Using the Replaceable Mechanical Parts List 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix

Index

Appendix A: Options A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1J A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 1M A–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Option 2 A–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VITS100 NTSC VITS Inserter Instruction Manual

List of Figures

Table of Contents

Figure 1–1: A setup for the functional check 1–3. . . . . . . . . . . . . . . . . . . .

Figure 1–2: A typical installation 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–1: The front panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–2: VITS100 NTSC VITS Inserter rear panel 2–2. . . . . . . . . . . .

Figure 2–3: VITS100 NTSC VITS Inserter source ID signal 2–4. . . . . . .

Figure 2–4: Location of VITS selection switches 2–6. . . . . . . . . . . . . . . . .

Figure 2–5: The VITS selection DIP switches 2–6. . . . . . . . . . . . . . . . . . . .

Figure 2–6: The REMOTE connector 2–8. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–1: 0% Black 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–2: 7.5% Black 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–3: 50% Gray 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–4: FCC Color Bars 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–5: FCC Composite 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–6: Multiburst 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–7: Multipulse 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–8: NTC7 Combination 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–9: NTC7 Composite 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–10: Red Field 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–11: SIN X/X 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–12: VIRS 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–13: Cable Multiburst 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–14: Cable Sweep 3–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–1: Inductor and switching transistor switching functions 4–8. .

Figure 5–1: VITS selection DIP switches 5–4. . . . . . . . . . . . . . . . . . . . . . .

Figure 5–2: Measuring VITS on a waveform/ vector monitor 5–6. . . . . .

Figure 5–3: Blanking level at 0 IRE 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–4: Equipment connections for phase matching 5–8. . . . . . . . . .

Figure 5–5: Using the video measurement set to measure waveform

characteristics 5–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–6: Setting up for pulse-to-bar measurement 5–11. . . . . . . . . . . . .

Figure 5–7: Using the video measurement set to compare signals 5–12. . .

Figure 5–8: Measuring hum rejection 5–14. . . . . . . . . . . . . . . . . . . . . . . . . .

VITS100 NTSC VITS Inserter Instruction Manual

iii

Table of Contents

Figure 5–9: Connecting the RF bridge to the spectrum

analyzer/tracking generator 5–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–10: The initial frequency response setup 5–20. . . . . . . . . . . . . . . .

Figure 5–11: Frequency response display 5–21. . . . . . . . . . . . . . . . . . . . . . .

Figure 5–12: Measuring frequency response 5–22. . . . . . . . . . . . . . . . . . . .

Figure 6–1: Adjustments and test points 6–4. . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–2: A setup for genlock adjustments 6–6. . . . . . . . . . . . . . . . . . . .

Figure 6–3: VITS selection DIP switches 6–7. . . . . . . . . . . . . . . . . . . . . . .

Figure 6–4: Equipment connections for gain adjustments 6–8. . . . . . . . .

Figure 6–5: Equipment for setting gain adjustments 6–8. . . . . . . . . . . . . .

Figure 6–6: Peak-to-peak detector connections 6–10. . . . . . . . . . . . . . . . . .

Figure 6–7: Display for adjusting flatness 6–11. . . . . . . . . . . . . . . . . . . . . .

Figure 6–8: Setting flatness 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 7–1: Moveable plug jumpers on the inserter circuit board 7–4. . .

Figure 7–2: Mounting hardware for the inserter circuit board 7–10. . . . .

Figure 7–3: Diagnostics switch, S8 7–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–1: A1 VITS Inserter Board (671–2132–05 & Up) 9–1. . . . . . . . .

Figure 9–2: A1A1 Oven Board 9–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–3: A1 VITS Inserter Board (671-2132-00 –04) 9–23. . . . . . . . . . .

Figure 10–1: Exploded view 10–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure A–1: Option 1J Red Field signal A–2. . . . . . . . . . . . . . . . . . . . . . . .

Figure A–2: Option 1J FCC Color Bar signal A–3. . . . . . . . . . . . . . . . . . .

Figure A–3: Option 1J Multipulse signal A–3. . . . . . . . . . . . . . . . . . . . . . .

Figure A–4: Video Measurement Set application for Option 1M A–5. . . .

Figure A–5: Cable Multiburst A–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure A–6: Cable Sweep A–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VITS100 NTSC VITS Inserter Instruction Manual

List of Tables

Table of Contents

Table 1–1: Factory VITS, Standard and Option 1M 1–4. . . . . . . . . . . . .

Table 1–2: Factory VITS, Option 1J 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–3: Factory VITS, Option 2 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–1: Standard Factory-Programmed Signals 2–5. . . . . . . . . . . . . .

Table 2–2: DIP Switch Settings 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–3: REMOTE Connector Pin Assignments 2–8. . . . . . . . . . . . . . .

Table 3–1: Program channel characteristics 3–1. . . . . . . . . . . . . . . . . . . .

Table 3–2: Test Signal and Black Burst general characteristics 3–2. . . .

Table 3–3: Black and Gray Test Signal characteristics 3–2. . . . . . . . . . . .

Table 3–4: FCC Composite characteristics 3–3. . . . . . . . . . . . . . . . . . . . .

Table 3–5: FCC Color Bars characteristics 3–4. . . . . . . . . . . . . . . . . . . . .

Table 3–6: Multiburst characteristics 3–4. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–7: Multipulse characteristics 3–4. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–8: NTC7 Combination characteristics 3–5. . . . . . . . . . . . . . . . . .

Table 3–9: NTC7 Composite characteristics 3–6. . . . . . . . . . . . . . . . . . . .

Table 3–10: Red Field characteristics 3–6. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–11: SIN X/X characteristics 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–12: Vertical Interval Reference Signal characteristics 3–7. . . . .

Table 3–13: Cable Multiburst (Option 2) characteristics 3–7. . . . . . . . . .

Table 3–14: Cable Sweep (Option 2) characteristics 3–8. . . . . . . . . . . . . .

Table 3–15: Genlock characteristics 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–16: Power Supply characteristics 3–9. . . . . . . . . . . . . . . . . . . . . .

Table 3–17: Physical characteristics 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–18: Environmental characteristics 3–10. . . . . . . . . . . . . . . . . . . . .

Table 3–19: Certifications and compliances 3–11. . . . . . . . . . . . . . . . . . . . .

Table 5–1: Equipment Required 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–2: DIP Switch Settings 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–3: Spectrum Analyzer Settings 5–19. . . . . . . . . . . . . . . . . . . . . . . .

Table 5–4: Multiburst Controls 5–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–1: Recommended Test Equipment 6–2. . . . . . . . . . . . . . . . . . . . .

Table 6–2: Power Supply Tolerances 6–5. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–3: TSG/SPG Multiburst Settings 6–10. . . . . . . . . . . . . . . . . . . . . .

VITS100 NTSC VITS Inserter Instruction Manual

Table of Contents

Table 7–1: Mode Selection Jumpers 7–5. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–2: Test Jumpers 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–3: The User Diagnostics 7–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 9–1: A1 Component Locator 671–2132–05 & Up 9–2. . . . . . . . . . . .

Table 9–2: A1A1 Component Locator 9–4. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 9–3: A1 Component Locator 671–2132–00 through -04 9–24. . . . . .

Table A–1: Option 1J Red Field Characteristics A–2. . . . . . . . . . . . . . . . .

Table A–2: Option 1J Factory Programmed VITS Insertions A–4. . . . . .

Table A–3: Option 1M Factory Programmed VITS Insertions A–5. . . . .

Table A–4: Option 2 DIP Switch Settings A–6. . . . . . . . . . . . . . . . . . . . . .

Table A–5: Cable System Test Signal Characteristics A–6. . . . . . . . . . . . .

Table A–6: Option 2 Factory Programmed VITS Insertions A–8. . . . . . .

VITS100 NTSC VITS Inserter Instruction Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

To Avoid Fire or Personal Injury

Use Proper Power Cord. Use only the power cord specified for this product and

certified for the country of use. Ground the Product. This product is grounded through the grounding conductor

of the power cord. To avoid electric shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

Do Not Operate Without Covers. Do not operate this product with covers or panels removed.

Use Proper Fuse. Use only the fuse type and rating specified for this product. Avoid Exposed Circuitry. Do not touch exposed connections and components

when power is present. Wear Eye Protection. Wear eye protection if exposure to high-intensity rays or

laser radiation exists. Do Not Operate With Suspected Failures. If you suspect there is damage to this

product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry . Provide Proper Ventilation. Refer to the manual’s installation instructions for

details on installing the product so it has proper ventilation.

Symbols and Terms

VITS100 NTSC VITS Inserter Instruction Manual

T erms in this Manual. These terms may appear in this manual:

vii

General Safety Summary

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

T erms on the Product. These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the

marking. WARNING indicates an injury hazard not immediately accessible as you read the

marking. CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product:

CAUTION

Refer to Manual

WARNING

High Voltage

Double

Insulated

Protective Ground

(Earth) Terminal

Not suitable for

connection to

the public telecom-

munications network

viii

VITS100 NTSC VITS Inserter Instruction 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. Do not perform internal service or adjustments of this

product unless another person capable of rendering first aid and resuscitation is present.

Disconnect Power. To avoid electric shock, switch off the instrument power, then disconnect the power cord from the mains power.

Use Care When Servicing With Power On. 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.

To avoid electric shock, do not touch exposed connections.

VITS100 NTSC VITS Inserter Instruction Manual

Service Safety Summary

VITS100 NTSC VITS Inserter Instruction Manual

Getting Started

VITS Inserter Functions

The Tektronix VITS100 NTSC VITS Inserter is a high quality signal generator designed to insert VITS (Vertical Interval Test Signals) into program video. It automatically switches to bypass mode in the event of power failure or loss of lock to the program video.

See VITS Inserter Functions, below, for a brief explanation of what the VITS inserter can do. See Functional Check and Installation, on page 1–3, to begin using your new VITS inserter.

You can program the VITS inserter to generate test signals and a source identification signal and insert the signal(s) into selected lines of the vertical interval. You can also use the VITS inserter to overwrite VITS that already exist in program video; overwriting with a Black signal effectively deletes existing material.

Test Signals

The VITS inserter uses 12-bit data at an 8F signal generation. The standard VITS inserter can generate and insert the following VITS into your choice of lines 17, 18, 19, and 20 in the even or odd fields of NTSC video:

H NTC7 Combination H NTC7 Composite H FCC Multiburst H 50% Gray H SIN H FCC Color Bars H FCC Composite H Multipulse H Vertical Interval Reference Signal (VIRS) H Red Field H 0% Black

X/X

data rate to ensure accurate test

H 7.5% Black

VITS100 NTSC VITS Inserter Instruction Manual

1–1

Getting Started

Source ID

Auto VIRS

Bypass

The VITS inserter can also insert a one-line source identification code on any of the available lines in vertical blanking. The Tektronix VM700A Video Measurement Set can then use this code to identify the source of the signal it is measuring.

Another function of the VITS inserter is Auto VIRS. When Auto VIRS is selected, the VITS inserter checks the specified lines and fields of the incoming program video for a VIRS signal. If VIRS is detected, the signal is passed with no processing; if VIRS is not detected, then the VITS inserter inserts the internally generated VIRS signal on the specified lines and fields.

Maintaining program channel continuity is one of the main considerations in the VITS inserter. Therefore, the VITS inserter provides rapid response to signal or equipment failure. If there is a failure, input video is automatically routed to the program output through circuitry that that adds delay equal to normal inserter processing delay.

If video is present but the VITS inserter cannot genlock to it (uncorrected-timebase video for example), then the program is passed with no VITS inserted. If there is no video present, or if the power fails, the VITS inserter switches to the bypass mode immediately.

When the failure is corrected, the VITS inserter passes program video through as soon as it is present, and begins VITS insertion as soon as genlock is achieved.

Remote Control

The rear-panel REMOTE connector provides limited remote control of the VITS inserter. This is a 9-pin ground closure system to permit manual switching between Bypass and Operate modes. In addition, the interface can drive indicators to mimic the front-panel POWER, BYPASS, and UNLOCKED LEDs.

Accessories and Options

This instrument is shipped with the following accessories:

H This Instruction Manual H A power cord appropriate to your local AC supply.

Optional configurations of the VITS inserter are available. See Appendix A: Options for more information.

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VITS100 NTSC VITS Inserter Instruction Manual

Functional Check and Installation

It is good practice to perform a functional check of a new instrument before installing it into your system.

Getting Started

Functional Check

Perform the following functional check to confirm proper operation of your new VITS inserter and to familiarize yourself with its features.

1. Unpack the instrument. If possible, save all packing materials for later

shipping or storage.

2. Connect the VITS inserter to the local AC power supply with the cord

provided with the instrument. The VITS inserter operates on any 48–62 Hz, 90–250 V supply; no switch or jumper settings are required.

3. Connect the VITS inserter to a test signal generator and waveform monitor

as shown in Figure 1–1.

4. Switch only the VITS inserter on. Confirm that, after approximately one

second, all three front panel LEDs are lit.

Waveform Monitor

VITS 100

NTSC VITS Inserter

75W Terminator

CH A input

Program In

Figure 1–1: A setup for the functional check

5. Switch the test signal generator on and configure it, if necessary, to output a

signal that does not contain any VITS (if it is available, select Black Burst). Confirm that the VITS inserter BYPASS and UNLOCKED LEDs are no longer lit.

6. Switch the waveform monitor on and configure it to display two fields of the

VITS inserter PROGRAM OUT waveform.

VITS100 NTSC VITS Inserter Instruction Manual

Program Out

Test Signal Output

NTSC test signal generator

1–3

Getting Started

7. While watching the waveform monitor display, repeatedly press the VITS

inserter BYPASS switch to alternate between bypass and normal operating

modes. Confirm that the appearance of the vertical interval (that is, the “gap”

between the two visible fields) changes in appearance, indicating the

alternating presence and absence of inserted VITS. The change is easiest to

see when the test signal generator is outputting a Black Burst signal.

8. Configure the waveform monitor line-select feature to view one line at a

time. Check lines 17 through 20 of fields 1 and 2 for test signals. Tables 1–1

through 1–3 list the signals generated and inserted by a new VITS100 NTSC

VITS Inserter with the as-manufactured configuration. See the Specifications

Section of this manual or Appendix A: Options for diagrams of the signal

waveforms.

T able 1–1: Factory VITS, Standard and Option 1M

Field Line Signal

1 17 NTC7 Composite 1 19 VIRS 2 17 NTC7 Combination 2 19 VIRS

T able 1–2: Factory VITS, Option 1J

Field Line Signal

1 17 FCC Composite 1 19 Color Bars (No Setup) 1 20 Sin X/X 2 17 Multiburst 2 20 Red Field (modified Luminance and Chrominance)

T able 1–3: Factory VITS, Option 2

Field Line Signal

1 17 Cable Multiburst 1 18 FCC Composite 2 17 Cable Sweep 2 18 Sin X/X

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VITS100 NTSC VITS Inserter Instruction Manual

Getting Started

Installation

You can mount the VITS inserter in a standard equipment rack or custom install it. In custom installations, be sure to provide easy access to the signal-selection DIP switches through the removeable panel in the top of the instrument. Also be sure not to block the cooling holes in the top cover. After performing the functional check, complete installation with the following steps:

1. If you wish, mount the VITS inserter in an existing equipment rack with one

of the following Tektronix generator mounting kits:

H TVGF11A—Single Rack Mount Adapter H TVGF13—Dual Rack Adapter H TVGF14—Dual Half-Rack Adapter

Please contact your nearest Tektronix representative or field office for more information.

2. Connect the VITS inserter to your system as shown in Figure 1–2.

3. See the Operating Basics section of this manual for more information about

configuring and using the VITS inserter.

Program line IN

Figure 1–2: A typical installation

VITS100 NTSC VITS Inserter Instruction Manual

Waveform monitor or vector scope (optional)

Program line OUT

1–5

Getting Started

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VITS100 NTSC VITS Inserter Instruction Manual

Operating Basics

Front Panel

The VITS100 NTSC VITS Inserter can generate any one of thirteen test signals for insertion on lines 17 through 20 in the vertical interval of the video frame. If power fails or the instrument cannot genlock, the VITS inserter automatically switches to bypass mode.

VITS signal selection and line assignments are made with four DIP switches that are accessible through the top of the VITS inserter. See VITS Selection, on page 2–5, for more information.

The VITS inserter has one switch and three indicator LEDs on the front panel, as shown in Figure 2–1. These features are explained in the following paragraphs.

Figure 2–1: The front panel

BYPASS

Switch and LED

UNLOCKED LED

POWER LED

VITS100 NTSC VITS Inserter Instruction Manual

Press the BYPASS button to place the VITS inserter into Relay Bypass mode. In this mode, the program input is applied directly to the program output through a delay line that matches the processing delays that affect the program channel in normal operation. Press BYPASS a second time to return to the normal operating mode. The red BYPASS LED is lit whenever the instrument is in bypass mode.

The UNLOCKED indicator is lit when the VITS inserter cannot acquire or maintain genlock to the program signal. To maintain correct timing, the VITS inserter must genlock to the input program.

The POWER LED indicates that the VITS inserter is switched on (through the rear-panel POWER switch). The LED lights when the power supply has completed its start-up process, approximately one second after you switch the VITS inserter on.

2–1

Operating Basics

Rear Panel

The VITS100 NTSC VITS Inserter rear panel, shown in Figure 2–2, contains the mains power input, switch, and fuse; the program input and output connectors; DIP switches for source identification code selection; and a remote connector.

Figure 2–2: VITS100 NTSC VITS Inserter rear panel

Power

Source ID

The power block consists of the connector, fuse, and power switch. It is located on the left third of the panel.

Power Connector. This instrument uses a power supply that accepts line voltages from 90 to 250 VAC without changing voltage ranges or fuses.

Fuse. The fuse holder accepts a standard cartridge fuse. See the rear panel or the Replaceable Electrical Parts section of this manual for the correct value.

Switch. A push-push, on-off switch; power is on when the switch is latched in the in position, as indicated by the rear-panel graphic.

This set of two dual in-line package (DIP) switches is used to select a source identification code. The source ID is a one-line, 16-bit word consisting of a start and stop bit and any one of 16,384 (2 can be inserted in the vertical interval (lines 17 through 20) to identify the source of the program signal.

The source ID signal is accepted by other video equipment, such as the Tektronix VM 700A Video Measurement Set, which can then include the source ID in reports or printouts to identify the source of the signal being measured.

) possible identification codes. The ID

2–2

Program In

The PROGRAM IN connector is the program video input. The input is AC coupled, clamped to ground, and internally terminated in 75 W.

VITS100 NTSC VITS Inserter Instruction Manual

Operating Basics

Program Out

Monitor Out

Remote Connector

Insertion Options

The PROGRAM OUT connector is the program video output. Output video can have user-selected VITS inserted on selected lines. If the instrument cannot lock to the program input video signal, or if power fails, the program automatically bypasses the VITS inserter processing circuitry; the input signal is then routed through a delay line, with a delay equivalent to the processing delays of the instrument, to PROGRAM OUT. Matching the delay eliminates timing errors whenever the VITS inserter must enter bypass mode.

This connector provides the same output as the PROGRAM OUT connector, except that the MONITOR OUT is not in the bypass signal path. This means that —during loss of genlock or activation of the bypass mode—the monitor output will still contain any inserted VITS. There is no output from this connector if power is lost.

This 9-pin connector enables ground-closure remote control of bypass mode. In addition, control lines that parallel the three front panel indicators (POWER, BYPASS, and UNLOCKED) are brought out to this connector.

Inserting Test Signals

You can configure the VITS inserter to insert test signals, pass existing video, insert or pass VIRS, or insert a source ID on lines 17, 18, 19, and 20 of both the even and odd fields of NTSC video.

The standard VITS100 NTSC VITS Inserter can insert the following test signals into the vertical interval:

H FCC Color Bars H FCC Composite

H FCC Multiburst H NTC7 Combination

H NTC7 Composite H VIRS

H 7.5% Black H 0% Black

H Multipulse H SIN X/X

H Red Field H 50% Gray

You can find descriptions of these waveforms in the Specifications section of this manual. If your instrument contains Option 1J, Option 1M, or Option 2, see Appendix A: Options for descriptions of the optional signals.

VITS100 NTSC VITS Inserter Instruction Manual

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Operating Basics

Passing Program Video

Auto VIRS

Inserting a Source ID

In addition to internally generated test signals, the VITS inserter can pass video signals that are already in the vertical interval of the program video. This includes the delete/insert lines, which are lines 17 through 20 in all fields.

When AUTO VIRS is selected, the instrument automatically checks the assigned line and field of the incoming video for a VIRS signal. If VIRS is detected, the line is passed with no processing. If VIRS is not detected, the internally generated VIRS signal is inserted onto the line.

Source identification can be inserted on any of the available vertical interval lines. The “Source ID” consists of sixteen equal-duration flags that can be set high or low with the rear-panel SOURCE ID switches. Source ID is set by the user to provide a visual identification of the signal path. Some equipment, such as the Tektronix VM700A Video Measurement Set, can use this signal to generate an alpha-numeric ID on the screen display or on printed reports. Figure 2–3 shows the waveform of a source identification code that is generated when all switch segments are set ON.

Source Identification

Switches all on

(S/N 8020244 and below)

0.5

Volts

0.0

(S/N 8020245 and up)

0.0

10.0 20.0 30.0 40.0 50.0 60.0 MicroSeconds

Figure 2–3: VITS100 NTSC VITS Inserter source ID signal

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VITS100 NTSC VITS Inserter Instruction Manual

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