Tektronix VM101, VM100 Service Manual

Service Manual

VM100 & VM101
Video Measurment Set

070-9288-02

This document supports firmware version 1.64
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 all safety summaries prior to
performing service.

Copyright © T ektronix, Inc. All rights reserved.
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.

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

Table of Contents

Specifications

Operating Information

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

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

Preface xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Manuals xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Manual Conventions xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contacting T ektronix xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Specification T ables 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T erms Used in Specifications 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Conditions 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Environmental Characteristics 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Standards and Certification 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Physical Characteristics 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Control Port 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Theory of Operation

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

Power Source Requirements 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Information 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel Buttons and LCD Display 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Menus 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear Panel Connectors 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power On Procedure 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Block Level Description 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Restore 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sync Stripper 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gain, DC Offset, and Filtering 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Phase Lock Loop 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog-to-Digital Converter 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital Signal Processor 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Acquisition Control 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Host Processor and Memory 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Interface (RS232) 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LCD Display 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Detailed Circuit Description 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VM100 & VM101 Service Manual

i

Table of Contents

Performance Verification

General Information 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Prerequisites 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Requirements 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Record 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification Procedure 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Restore 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sync Stripper 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gain, DC Offset, and Filtering 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Phase Lock Loop 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A/D Converter 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital Signal Processor (DSP) 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Acquisition Control 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Host Processor and Memory 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Interface (RS232) 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LCD Display 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Purpose 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Interval 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Initial Setup 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configure the Video Measurement Set 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Signal Identification T est 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Differential Phase Test 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Differential Gain Test 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sync Amplitude T est 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Burst Amplitude T est 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bar Amplitude T est 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2T K-factor Test 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chrominance-to-Luminance Delay T est 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chrominance-to-Luminance Gain T est 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Luminance Nonlinearity T est 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Group Delay T est 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Frequency Response T est 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedures

ii

General Information 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Purpose 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Interval 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Requirements 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Personnel 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warmup Period 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Access 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Required T est Equipment 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedure 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interrupting the Adjustments 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performing the Adjustments 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VM100 & VM101 Service Manual

Maintenance

Table of Contents

Preventing ESD 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Disposal 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Cleaning 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Care 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Cleaning Procedures 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal and Replacement Procedures 6–7. . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Summary of Procedures 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ools Required 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T op Cover 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main Board 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LCD Board 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lithium Battery 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T esting the Lithium Battery 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply Limits 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting the main board (A2) 6–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Examples of Analog Signal Measurements 6–21. . . . . . . . . . . . . . . . . . . . . . . . .

Phase Lock and DSP Diagnostic LEDs and Key Signals 6–25. . . . . . . . . . . . . . .

ACQ:SHOW Command 6–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting the VM140 or VM141 System 6–30. . . . . . . . . . . . . . . . . . . . .

Repackaging Instructions 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Packaging 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options

Standard Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Electrical Parts

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

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

Diagrams

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

Component Values 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graphic Items and Special Symbols Used in This Manual 9–2. . . . . . . . . . . . . . . . .

Component Locator Diagrams 9–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Mechanical Parts

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

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

VM100 & VM101 Service Manual

iii

Table of Contents

List of Figures

Figure 2–1: Front panel 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–2: LCD display characteristics 2–3. . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–3: The Meas, Mem, and Print menus 2–4. . . . . . . . . . . . . . . . . .

Figure 2–4: The CONFIG menu 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–5: Rear panel connectors 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–1: Simplified view of Gain, DC Offset, and Filtering block 3–5

Figure 3–2: Acquisition and DSP system 3–8. . . . . . . . . . . . . . . . . . . . . . .

Figure 3–3: Host processor and memory system 3–10. . . . . . . . . . . . . . . . .

Figure 4–1: Initial setup for the PV procedure 4–4. . . . . . . . . . . . . . . . . . .

Figure 5–1: Equipment setup for the adjustment procedure 5–4. . . . . . .

Figure 6–1: Top cover replacement 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–2: Front panel assembly replacement 6–9. . . . . . . . . . . . . . . . . .

Figure 6–3: Front panel board replacement 6–10. . . . . . . . . . . . . . . . . . . . .

Figure 6–4: Main board removal 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–5: Front panel assembly removal 6–12. . . . . . . . . . . . . . . . . . . . . .

Figure 6–6: Power supply board replacement 6–13. . . . . . . . . . . . . . . . . . .

Figure 6–7: LCD board replacement 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–8: Lithium battery replacement 6–16. . . . . . . . . . . . . . . . . . . . . . .

Figure 6–9: Power supply test points and limits 6–19. . . . . . . . . . . . . . . . . .

Figure 6–10: Location of diagnostic LEDs 6–21. . . . . . . . . . . . . . . . . . . . . .

Figure 6–11: Setup for measuring analog signals 6–22. . . . . . . . . . . . . . . . .

Figure 6–12: Waveform at A2TP9 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–13: Waveform at A2TP10 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–14: VIDEO waveform at A2TP31 6–24. . . . . . . . . . . . . . . . . . . . .

Figure 6–15: COMP_SYNC waveform at A2TP15 6–24. . . . . . . . . . . . . . .

Figure 6–16: FIELD waveform at A2TP16 6–25. . . . . . . . . . . . . . . . . . . . . .

Figure 6–17: 8FSC_IN waveform at A2U116 pin 7 6–26. . . . . . . . . . . . . . .

Figure 6–18: HPULSE waveform at A2TP18 6–27. . . . . . . . . . . . . . . . . . . .

Figure 6–19: DSP_RCK waveform at A2U48 pin 1 6–27. . . . . . . . . . . . . . .

Figure 6–20: Example of the ACQ:SHOW command PC display 6–28. .

Figure 6–21: Setup for using the ACQ:SHOW command 6–29. . . . . . . . .

Figure 9–1: Interconnect diagram 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iv

VM100 & VM101 Service Manual

Table of Contents

Figure 9–2: Block diagram 9–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–3: A2 Main board view A (671-3250-00/01/02/03) 9–5. . . . . . . .

Figure 9–4: A2 Main board view B (671-3250-00/01/02/03) 9–6. . . . . . . .

Figure 9–5: A2 Main board view C (671-3250-00/01/02/03) 9–7. . . . . . . .

Figure 9–6: A2 Main board component locator

(671-3250-00/01/02/03) 9–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–7: A2 Main board view A (671-3751-00) 9–9. . . . . . . . . . . . . . . .

Figure 9–8: A2 Main board view B (671-3751-00) 9–10. . . . . . . . . . . . . . . .

Figure 9–9: A2 Main board section C (671-3751-00) 9–11. . . . . . . . . . . . . .

Figure 9–10: A2 Main board component locator (671-3751-00) 9–12. . . . .

Figure 9–11: A1 Front Panel board 9–26. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–1: Exploded view 10–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VM100 & VM101 Service Manual

v

Table of Contents

List of Tables

Table 1–1: Input signal requirements–VIDEO INPUT 1–3. . . . . . . . . . .

Table 1–2: Input signal requirements–EXT REF 1–3. . . . . . . . . . . . . . . .

Table 1–3: Measurement accuracy 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–4: Output 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–5: AC power source 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–6: Environmental characteristics 1–5. . . . . . . . . . . . . . . . . . . . . .

Table 1–7: Certifications and compliances 1–6. . . . . . . . . . . . . . . . . . . . . .

Table 1–8: Physical characteristics 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–9: Remote control port 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–1: Configuration parameters 2–7. . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–2: Print parameters 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–3: Computer interface parameters 2–13. . . . . . . . . . . . . . . . . . . . .

Table 2–4: Date parameters 2–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2–5: Time parameters 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–1: Power-on diagnostics 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–1: Test Equipment 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–1: Adjustments after repair 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–2: Required test equipment 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–3: Adjustment steps 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–1: Relative susceptibility to static discharge damage 6–2. . . . . .

Table 6–2: External inspection check list 6–4. . . . . . . . . . . . . . . . . . . . . . .

Table 6–3: Internal inspection check list 6–4. . . . . . . . . . . . . . . . . . . . . . .

Table 6–4: Tools required for module replacement 6–8. . . . . . . . . . . . . . .

Table 6–5: Power-on diagnostics 6–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–6: Control mode communications parameters 6–31. . . . . . . . . . .

Table 7–1: Power cord identification 7–2. . . . . . . . . . . . . . . . . . . . . . . . . .

vi

VM100 & VM101 Service Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.

Only qualified personnel should perform service procedures.

If this equipment is used in any manner not specified, including failure to follow
any rating or direction for use, the protection provided by the equipment may be
impaired.

Injury Precautions

Product Damage

Precautions

Use Proper Power Cord. To avoid fire hazard, use only the power cord specified

for this product.
Avoid Overvoltage. To avoid electric shock or fire hazard, do not apply potential

to any terminal, including the common terminal, that varies from ground by
more than the maximum rating for that terminal.

Ground the Product

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

Do Not Operate Without Covers. To avoid electric shock or fire hazard, do not
operate this product with covers or panels removed.

Use Proper Fuse. To avoid fire hazard, use only the fuse type and rating specified
for this product.

Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate
this product in wet or damp conditions.

Do Not Operate in an Explosive Atmosphere. To avoid injury or fire hazard, do not
operate this product in an explosive atmosphere.

Use Proper Power Source. Do not operate this product from a power source that
applies more than the voltage specified.

. This product is grounded through the grounding conductor

Provide Proper Ventilation. To prevent product overheating, provide proper

ventilation.
Do Not Operate With Suspected Failures. If you suspect there is damage to this

product, have it inspected by qualified service personnel.

Symbols and Terms

VM100 & VM101 Service 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:

Certifications and

Compliances

DANGER

High Voltage

Protective Ground

(Earth) T erminal

ATTENTION

Refer to Manual

Double

Insulated

Refer to the specifications section for a listing of certifications and compliances
that apply to this product.

viii

VM100 & VM101 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. 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, disconnect the main power by means
of the power cord or, if provided, the power switch.

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.

VM100 & VM101 Service Manual

ix

Service Safety Summary

x

VM100 & VM101 Service Manual

Preface

Use this manual to service the video measurement set to the module or compo­nent level. Contact your local Tektronix service center or sales engineer for more
information on repair and adjustment services.

Related Manuals

The VM100 & VM101 Video Measurement Sets User Manual (Tektronix part
number 070-9522-XX) describes how to use the video measurement set.

Service Manual Conventions

In this manual, the term “module” refers to any field-replaceable component,
assembly, or part of the video measurement set.

Strategy for Servicing

To prevent personal injury or instrument damage:

H This product should be serviced only by a qualified service person
H Read the General and Service Safety Summaries at the front of this manual,

as well as Operating Information beginning on page 2–1
H Follow all warnings, cautions, and notes in this manual

Adjustment Interval

Generally, you should perform the Adjustment Procedures once a year. In
addition, perform the procedures after module replacement.

Tektronix Service Offerings

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 are well equipped to service the video
measurement set. Tektronix technicians train on Tektronix products and have
access to the latest information on product improvements and new options.

VM100 & VM101 Service Manual

xi

Preface

Warranty Repair Service

At-Depot Repair or

Calibration Service

Module Exchange

Contacting Tektronix

Tektronix warrants this product for one year from date of purchase. The warranty
appears behind the title page in this manual. Tektronix technicians provide
warranty service at most Tektronix service locations worldwide. The Tektronix
product catalog lists all service locations worldwide.

The following services can be purchased to meet to your repair/calibration needs.

H A single repair and/or adjustment
H Calibrations using equipment and procedures that meet the traceability

standards specific to the local area

H Annual maintenance agreements that provide for either calibration and

repair, or calibration only.

Reduce down time for repair by exchanging modules for remanufactured ones.
Tektronix ships 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.

Product
Support

Service
Support

For other
information

To write us Tektronix, Inc.

For application-oriented questions about a Tektronix measure­ment product, call toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. – 5:00 p.m. Pacific time

Or contact us by e-mail:
[e-mail]

For product support outside of North America, contact your
local Tektronix distributor or sales office.

Contact your local Tektronix distributor or sales office. Or visit
our web site for a listing of worldwide service locations.

http://www.tek.com
In North America:

1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.

P.O. Box 1000
Wilsonville, OR 97070-1000

xii

VM100 & VM101 Service Manual

Specifications

Product Description

This chapter provides a complete description of the specifications. Product
Description is a general description of the instrument. The Specification Tables,

which begin on page 1–2, contain the complete specifications.

The Tektronix VM100 and VM101 Video Measurement Sets are automatic video
measurement instruments. The VM100 measures NTSC signals and the VM101
measures PAL signals.

The video measurement sets use existing or inserted test signals and take
measurements consistent with regulatory specifications.

The video measurement sets display measurement results on a LCD screen. You
can also display measurement results on a serial printer or remote PC using the
RS-232 port. The video measurement sets perform the following measurements
(on-screen labels are shown in parentheses):

Differential Phase (DIFF PHASE)

Differential Gain (DIFF GAIN)

Chrominance-to-Luminance Delay (YC DELAY)

Chrominance-to-Luminance Gain (YC GAIN)

Signal-to-Noise Ratio (SNR WGT/FLAT)

Frequency Response (FREQ FCC or AVG)

Frequency Response Detail (FREQ FLAG, FREQ #1 through FREQ #6) or

(FRQmax and FRQmin)

Group Delay (GRPDLYmax and GRPDLYmin)

Sync Amplitude (SYNC AMPL)

Burst Amplitude (BURST AMPL)

Bar Amplitude (BAR AMPL)

2T K-Factor (2T K-FACTOR)

Luminance Nonlinearity (LUM NON-LIN)

Hum (HUM P-P, 50/60 Hz, and 100/120 Hz)

VM100 & VM101 Service Manual

1–1

Specifications

Specification Tables

This section provides a complete description of the video measurement set
specifications. Refer to the Performance Conditions for a description of the
required temperature range and other pertinent operating conditions.

Terms Used in
Specifications

Performance Conditions

Characteristic. A characteristic refers to a property of the product.
Performance Requirement [REQ]. Performance Requirements define

characteristics that are essential to the intended application of the product,
usually in limit form.

Reference Information [RI]. Reference Information explains the performance
requirements or stipulates conditions under which the performance requirements
are effective. Reference information is not considered to be a statement of
guaranteed performance.

Specification. A specification is a document or a section of a document that lists
and describes characteristics and performance requirements of a product.

Typical. Typical refers to instrument performance that can be expected but is not
guaranteed.

The performance requirements listed in the Electrical Specifications apply over
an ambient temperature range of 0° C to +50° C. The rated accuracies are valid
over the entire 0° C to 50° C range and become “typical” for temperatures from
–10° C to 0° C. Test equipment used to verify performance requirements must be
calibrated and working within the specified limits.

All specifications (with the exception of Signal-to-Noise Ratio Measurement
Accuracy) apply for Signal-To-Noise Ratio ≥ 52 dB (weighted). Averaging
(AVG) is enabled for all specifications.

1–2

VM100 & VM101 Service Manual

Electrical Specifications

T able 1–1: Input signal requirements–VIDEO INPUT

Category Description

Maximum Operating Voltage REQ: –1.8 V to +2.2 V
Absolute Maximum Input Voltage REQ: –8.5 V to +8.5 V
Minimum Operating Voltage REQ: 1 Vp-p video signal

RI: Typically operates with a 1 Vp-p input, +1 dB or –6 dB

DC Input Impedance REQ: ≥20 KW

RI: DC coupling

Return Loss REQ: >40 dB to 6 MHz

RI: DC coupling

Specifications

T able 1–2: Input signal requirements–EXT REF

Category Description

Absolute Maximum Input Voltage REQ: –8.5 V to +8.5 V
Minimum Operating Voltage REQ: 1 Vp-p video signal

RI: Typically operates with a 1 Vp-p input, +1 dB or –6 dB
DC Input Impedance REQ: ≥20 KW
Return Loss REQ: >40 dB to 6 MHz
Video INPUT / EXT REF

Loop-through Isolation RI: >70 dB (typical)
Crosstalk REQ: >70 dB to 6 MHz

T able 1–3: Measurement accuracy

Category

Differential Phase REQ: <1.0 °

Differential Gain REQ: <2.0 %

1

Description

RI: Typically <0.5° from 20° C to 30° C with test signal generator source

RI: Typically <1 % from 20° C to 30° C for nominal 300 mV chrominance

amplitude

1

All tests are performed with AVG enabled. Processing time for each measurement is a function of the signal-to-noise
ratio.

VM100 & VM101 Service Manual

1–3

Specifications

T able 1–3: Measurement accuracy (cont.)

Category

1

Description

Chrominance-to-Luminance Gain REQ: <2 %

RI: Typically <1 % from 20° C to 30° C with test signal generator source

Chrominance-to-Luminance Delay REQ: <20 ns

REQ: <10 ns from 20° C to 30° C with test signal generator source.

RI: Typically <5 ns from 20° C to 30° C with test signal generator source

Frequency Response REQ: <0.2 dB

RI: Typically <0.1 dB (1 %) from 20° C to 30° C with test signal generator

source

RI: VM100: 50 kHz to 4.2 MHz

VM101: 50 kHz to 5.8 MHz

2T K-Factor REQ: 2 %

RI: Typically <0.5 % from 20° C to 30° C with test signal generator source

2

Hum

REQ: ±1.0% for hum ≤4.0%

±2.0% for hum >4.0% and <15.0%

RI: Typically ±0.5% for hum ≤4.0%

Signal-to-Noise Ratio
(Weighted or Flat)

REQ: ±1 dB, 28 dB to <45 dB

±2 dB, 45 dB to <60 dB
±3 dB, 60 dB to 67 dB (WGT)

RI: VM100: Noise is weighted with EIA RS-250-B 5 MHz weighted noise

filter (T ektronix part number 015-0215-00 equivalent)
VM101: Noise is weighted with CCIR 567 weighted noise filter

Group Delay REQ: <20 ns

RI: 50 kHz to 4.8 MHz, within the bandwidth of the signal under test

Sync Amplitude

2

REQ: <1.0%

Burst Amplitude REQ: <1.0%
Bar Amplitude REQ: <1.0%
Luminance Nonlinearity REQ: <1.0%

1

All tests are performed with AVG enabled. Processing time for each measurement is a function of the signal-to-noise ratio.

2

The hum and sync amplitude measurements are inaccurate in the presence of Sound In Sync (SIS) signals.

1–4

VM100 & VM101 Service Manual

Specifications

T able 1–4: Output

Category Description

Zero Carrier Reference Pulse Output RI: Can drive demodulator ZCRP trigger of TTL type (Tektronix TDM5,

DS1200, 1450) or 1.5 V

, 75 W type (Tektronix 1340, 1350)

p-p

T able 1–5: AC power source

Category Description

Mains Voltage Range REQ: 90-250 VAC

50/60 Hz

0.7 A

Power Consumption REQ: 30 W maximum

Environmental Characteristics

T able 1–6: Environmental characteristics

Category

Altitude
(see page 1–6 for safety-related information)

Humidity REQ: To 95% relative humidity at or below +50° C
Operating Temperature REQ: 0° C to + 50° C (32° F to 122° F)

Package Drop REQ: Meets Tektronix 062-2858-00, Rev. B
Random Vibration

(Operating and Non-Operating)
Shock (Operating) REQ: Meets Tektronix Class III (062-2858-00, Rev. B)

Storage Temperature REQ: –40° C to + 75° C (–40° F to +167° F)
Loose Load Vibration

(Repetitive Shock)
Vehicle Vibration REQ: Meets Tektronix 062-2858-00, Rev. B

Description
REQ: Operating: to 15,000 f (4572 m)

Non-operating: to 50,000 f (15,240 m)

RI: Maximum operating temperature decreases 1° C per 1000 f (305 m)

RI: Electrical specifications are guaranteed when the instrument is

operated in this temperature range

REQ: Meets Tektronix Class III (062-2858-00, Rev. B)

RI: Three drops on each face of 50 g, 11 ms duration, half-sine pulse

shape for a total of 18 drops

REQ: Meets Tektronix 062-2858-00, Rev. B (page 51, section 17.7.4)

VM100 & VM101 Service Manual

1–5

Specifications

ertifications

Safety Standards and Certification

T able 1–7: Certifications and compliances

Category Description

Altitude
(Maximum Operating)

See page 1–5 for additional information
C

US Nationally Recognized Testing
Laboratory Listing

Canadian
Certification

European Union Compliance Low Voltage Directive 73/23/EEC, Amended by 93/68/EEC
Additional

Compliance

EC Declaration of
Conformity

Operating: to 6,500 f (2000 m)

ANSI/ISA S82

Safety Standard for Electrical and Electronic Test, Measuring, Controlling, and
Related Equipment

CAN/CSA C22.2 No.1010.1

Safety Requirements for Electrical Equipment for Measurement, Control, and
Laboratory Use

UL31 11-1

Standard for Electrical Measuring and Test Equipment

IEC 1010-1

Safety Requirements for Electrical Equipment for Measurement, Control, and
Laboratory Use

Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility and Low
Voltage Directive 73/23/ECC for Product Safety. Compliance was demonstrated to
the following specifications as listed in the Official Journal of the European
Communities:

EMC Directive 89/336/EEC:
EN 50081-1 Emissions:

EN 55022 Class B Radiated and Conducted

Emissions

EN 50082-1 Immunity:

IEC 801-2 Electrostatic Discharge Immunity
IEC 801-3 RF Electromagnetic Field Immunity
IEC 801-4 Electrical Fast T ransient/Burst

Immunity

3

Low Voltage Directive 73/23/EEC:
EN 61010-1 Safety requirements for electrical

equipment for measurement, control,
and laboratory use

3

Using high quality shielded cables.

Equipment Type Test and Measuring
FCC Compliance Emissions comply with FCC Code of Federal Regulations 47, Part 15, Subpart B,

Class A Limits

1–6

VM100 & VM101 Service Manual

T able 1–7: Certifications and compliances (cont.)

erial Port

Category Description

Overvoltage Category Overvoltage Category II (as defined in IEC 1010-1, Annex J)
Pollution Degree Pollution Degree 2 (as defined in IEC 1010-1); rated for indoor use only
Safety Class Class I (as defined in IEC 1010-1, Annex H)
T emperature (Operating) +5° C to +50° C (+41° F to 122° F)

Physical Characteristics

T able 1–8: Physical characteristics

Category Description

Dimensions Height: 1.71 in (4.34 cm) Nominal

Width: 8.1 in (20.6 cm) Nominal

Depth: 17.2 in (43.7 cm) Nominal
Stand-Alone Instrument Weight 4.00 lbs (1.81 kg) Nominal
Packaged Weight (for domestic shipment) 7.12 lbs (3.23 kg) Nominal

Specifications

Remote Control Port

T able 1–9: Remote control port

Category Description

RS232 S

12345

6789

Connector: Nine-pin DCE female

Baud Rate: 1200, 2400, 9600, or 19.2K

Pin Signal Name RS232-C Name

1

2

3

4

5

6

7

8

9

Not Used
TX (Transmit Data; Output)
RX (Receive Data; Input)
Not Used
GND (Signal Ground)
Not Used
RTS (Request to Send; Output)
CTS (Clear to Send; Input)
Not Used

BA
BB

AB
CA

CB

VM100 & VM101 Service Manual

1–7

Specifications

1–8

VM100 & VM101 Service Manual

Operating Information

This section describes how to operate the video measurement set. The operating
information is limited to the functions required to perform the procedures found
in this manual. More detailed operating instructions can be found in the VM100
& VM101 Video Measurement Sets User Manual (Tektronix part number
070-9522-XX).

The Operating Information is divided into the following sections:
H Installation describes the power source requirements and explains where to

find a list of the power cord options

H Operating Information on page 2–1 describes the front panel buttons and

LCD display, the menus, the rear panel connectors, the power on procedure,
and configuration instructions

Installation

Power Source
Requirements

Operating Information

The video measurement set operates over the range of 90 V
either 50 Hz or 60 Hz. The power source should never apply more than 250 V
between the supply conductors or between either supply conductor and ground.

WARNING. To avoid personal injury due to electrical shock, never operate the
video measurement set without the protective ground connection by way of the
grounding conductor in the power cord.

This section provides the information you will need to operate the video
measurement set when performing the procedures in this manual. It contains the
following information:

H Descriptions of the front panel buttons and the LCD display
H Descriptions of the menus
H Descriptions of the rear panel connectors
H Power on procedure

to 250 V

rms

rms

at

rms

H Configuration instructions for each operating mode

VM100 & VM101 Service Manual

2–1

Operating Information

Front Panel Buttons and

LCD Display

The front panel contains twelve buttons and an LCD display as shown in
Figure 2–1. There are seven function buttons, four arrow buttons, and the enter
button. A green LED indicator, located at the center of each function button,
lights to show when the associated function is turned on. The arrow buttons are
designated by directional arrows. A carriage return symbol (↵) identifies the
enter button.

1 2 4

10

3

9 8 7 6

5

Figure 2–1: Front panel

Five of the function buttons (MEAS, SIG ID, MEM, PRINT, and CONFIG) are
exclusive to each other. This means that only one of the functions can be active
at a time. When you press another of these buttons, the previous function
automatically turns off.

The following descriptions refer to Figure 2–1.

MEAS. Press the measure button to display the results of measurements the

1

video measurement set makes on the LCD display. Use the CONFIG menu to
turn measurements ON or OFF. Measurements must be ON to appear in the
MEAS list.

2

SIG ID. Press the signal identification button to display the name and location

of signals in the vertical interval and the source ID (when contained in the
signal).

3

AVG. Press this toggle switch to turn signal averaging on and off.
FREEZE. Press this toggle switch to turn the freeze feature on and off. When

4

FREEZE is turned on, all acquisition and measurement activity stops so that
you can view intermediate measurement and signal ID results.

5

Arrow Buttons. Press the up (↑) or down (↓) arrow buttons to scroll through

various LCD displays. Press the left (←) and right (→) arrow buttons to
change instrument parameters and to view measurement results on other
video lines.

2–2

VM100 & VM101 Service Manual

Operating Information

6

Enter Button. Press the enter (↵) button to enter and exit the CONFIG

submenus and to control print and memory functions.

CONFIG. Press the configure button to access instrument configuration menus

7

and to view the instrument software version.

PRINT. Press the print button to print the current or saved measurement data or

8

to output results to a computer, using the RS-232 serial port. You must
configure the RS-232 port for printing and select the print parameters before
using the print function.

9

MEM. Press the memory button to save the current measurement and SIG ID

results in instrument memory and to access memory management selections
including ERASE, REPLACE, VIEW, and RENAME.

10

LCD Display . The LCD display shows measurement readouts and menu

selections. Figure 2–2 shows examples of the text and symbols you will see
on the LCD display. The symbols help you navigate quickly through the
menu system using the arrow buttons and the enter button. Dots (…)
following the menu name indicate that a menu has a submenu.

Shows submenu

Figure 2–2: LCD display characteristics

Arrow buttons
Enter button

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Operating Information

Menus

The MEAS, SIG ID, MEM, PRINT, and CONFIG buttons allow access to
additional selections or measurement results. Figures 2–3 and 2–4 show the
menu structure of the video measurement set. The SIG ID menu is not shown
because its contents depend upon the input signal characteristics.

2–4

Figure 2–3: The MEAS, MEM, and PRINT menus

VM100 & VM101 Service Manual

Operating Information

Figure 2–4: The CONFIG menu

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Operating Information

Rear Panel Connectors

There are seven connectors mounted on the video measurement set rear panel.
Refer to Figure 2–5 for descriptions.

1

2

3 4

5

Figure 2–5: Rear panel connectors

AC Power Connector. The AC power connector is a standard AC plug receptacle

1

for 120 or 240 V

power mains. The plug is compatible with each available

ac

power cord option.

2

ZERO CARRIER PULSE OUTPUT. The ZERO CARRIER PULSE OUTPUT

produces a reference pulse that triggers a demodulator. Signal amplitude is

1.5 V

when driving a 75 W load or TTL compatible when driving a high

p-p

impedance. This pulse is compatible with the trigger inputs on the following
Tektronix Demodulators: DS1200, TDM5, 1450, 1340, and 1350.

EXT REF. This high-impedance, loop-through input (two BNC connectors)

3

accepts external reference signals of composite video or black burst (1 V
Use this input if the video input has no sync information. The input is AC
coupled and compensated for 75 W. It is not internally terminated.

4

INPUT. This high-impedance, loop-through input (two BNC connectors)

accepts video input signals for the video measurement set. The input is AC
coupled and compensated for 75 W. It is not internally terminated.

5

RS232 Port. This nine-pin subminiature D-type female connector provides an

RS232 serial interface for printer and computer communication. The port also
provides the interface for waveform the monitor control function.

p-p

).

2–6

VM100 & VM101 Service Manual