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Tektronix Manuals
Measuring Instruments
1720
Instruction manual
Tektronix 1720 Instruction Manual
Vectorscope
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Instruction manual
(138 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
General Safety Summary
Preface
Section 1 Introduction and Specification
Accessories
Standard Accessories
Optional Accessories
Options
CRT Options
Power Cord Options
Safety Information
Specifications
Table 1-1: Signal Input
Table 1-2: Vector Mode
Table 1-3: XY Mode
Table 1-4: CRT Display
Table 1-5: Power Source
Table 1-6: Environmental Characteristics
Section 2 Operating Instructions
Front-Panel Controls and Indicators
Figure 2-1: Control and Indicator Locations
Gain
Input
Display
Miscellaneous
Phase
Rear-Panel Connectors
Figure 2-2: 1720/1721 Rear Panel
Using the 1720/1721 in Auxiliary Mode
INPUT Switching
REF Switching
Line Select
Store
Recall
Figure 2-3: Signal Connection for the Operator's Checkout Procedure
Figure 2-4: 1720/1721 Typical Vector Display
Figure 2-5: Modulated Staircase Waveform Shown on a 1721
Figure 2-6: Color Bar and Modulated Staircase Signals both Displayed on a 1721
Figure 2-7: Connection for Using Black Burst Signal for External Reference
Figure 2-8: 1720/1721 Test Circle Display
Measurement Applications
Color Measurements
Figure 2-9: NTSC Standard Color Phase Vector Diagram
Figure 2-10: PAL Standard Color Phase Vector Diagram
Figure 2-11: Partial 1720 Graticule Showing the 75% Amplitude Burst Target
Figure 2-12: Partial 1721 Graticule Showing the 75% Amplitude Burst Target
Functional Use of the Vector Graticule
Measurement of Color Bars
Figure 2-13: Fine Detail of the 1720 Graticule Magenta Target
Figure 2-14: Fine Detail of the 1721 Graticule Target
Figure 2-15: Simulated 1720 Graticule Showing the Relationship between Amplitudes on the
Differential Gain and Phase Measurements
Figure 2-16: Simulation of a 1721 Graticule Showing the Relationship between Amplitudes
Figure 2-17: a Simulation of a Part of the 1720 Graticule Showing the Differential Phase and
Y Measurements
Making Stereo Audio Phase Measurements
Figure 2-18: Simulation of the 1721 Differential Gain and Phase Graticule Showing
Looking at Incidental Carrier Phase Modulation
Service Safety Summary
Section 3 Installation
Packaging
Electrical Installation
Power Source
Mains Frequency and Voltage Ranges
Operating Options
Y INPUT Connector
Figure 3-1: Plug Jumper Locations
Table 3-1: Internal Jumper Selection
Auxiliary Connector
Mechanical Installation
Cabinetizing
Table 3-2: AUXILIARY Connector Pin Assignments
Figure 3-4: 1700F00 Plain Cabinet
Securing the Instrument in Its Cabinet
Figure 3-5: 1700F02 Portable Cabinet
Rack Mounting
Figure 3-6: Cabinet Securing Screws
Figure 3-7: 1700F05 Rack Adapter
Figure 3-8: 1700F05 Rack Adapter Adjustment
Figure 3-9: 1720/1721 and 1700F06 Blank Panel
Custom Installation
Figure 3-10: Typical Custom Installation Showing the Console
Section 4 Theory of Operation
Overview
Block Diagram
Video Input
Luminance Processing
Microprocessor
Section 4 Theory of Operation
Gain Cell
Chrominance Processing
Figure 4-1: Simple Block Diagram of a 1720/1721 Vectorscope
Demodulators
Output Amplifiers
CRT Blanking
Circuit Descriptions
Diagram 1 Input and Deflection Amplifiers
Video Input Amplifiers
Gain Cell
Diagram 2 Subcarrier Regenerator
Reference Switch
Sync Separator
Bowes Oscillator
Back Porch Sample
Loop Phase Detector and Amplifier
Luminance and Chrominance Amplifiers
Quadrature Phase Detector and Amplifier
Burst Clamp
Lock Detector and Bandwidth Switch
Error Amplifier
PAL Phasing
Vcxo
Diagram 3 Demodulator
V-Axis Switcher
Chrominance Demodulators
Sync Tip Chrominance Clamp
Demodulator Output Filters and Amplifiers
Vector Center Dot Position Clamp
Diagram 4 Deflection Amplifier
XY Input Amps
Deflection Amplifiers
Center Dot Comparators
CRT Blanking
Diagram 5 Microprocessor
Microprocessor
Table 4-1: U613 Switching Control Outputs
Diagram 6 Control Circuit
Z-Axis Control
Trace Rotation
Graticule Illumination
Post Regulators
Diagram 7 Low Voltage Power Supply
Output Filters
Error Amplifier
Feedback Transformer Driver and Peak Detector
Output HV Shutdown
Diagram 8 High Voltage Power Supply
Focus Amplifier
Grid Drive Circuit
Z-Axis Amplifier
Section 5 Checks and Adjustments
Recommended Equipment List
Electrical Instruments
Section 5 Checks and Adjustments
Auxiliary Equipment
Performance Check Procedure Short-Form Reference
Table 5-1: Performance Check Procedure Short-Form Reference
Performance Check Procedure
Figure 5-2: Loop–Through Connection of Black Burst Signal to both EXT REF and CH-B
Figure 5-3: Using the Vector Graticule –3 Db Markings to Measure Bandwidth
Figure 5-4: Signal Connection for Checking CH-A/CH-B Phase Matching
Figure 5-5: Rear-Panel XY INPUT Connector Showing Inputs
Figure 5-6: Audio Frequency XY Display
Adjustment Procedure
Signal Connections
Adjustment Procedure Short-Form Reference
Figure 5-8: Starting Connections for the Adjustment Procedure
Table 5-2: Adjustment Procedure Short-Form Reference
Long-Form Adjustment Procedure
Figure 5-9: Test Points and Adjustment Locations for the 11.8V Supplies
Section 6 Maintenance
Preventive Maintenance
Cleaning
Visual Inspection
Table 6-1: Static Susceptibility
Performance Checks and Readjustments
Troubleshooting
Foldout Pages
Parts Lists
Major Assembly Interconnection
Specific Troubleshooting Procedures
Power Supply
Introduction
Low Volts Supply
High Volts Supply
Table 6-2: Power Supply Fault Symptoms
Table 6-3: Low Volts Supply Voltages
Table 6-4: Control Circuit Test Points
High Volts Supply
Table 6-5: High Volts Supply Fault Symptoms
Table 6-6: High Voltage Oscillator Test Points
Serial Port and LED Driver Diagnostics
Corrective Maintenance
Mechanical Disassembly/Assembly
Bezel Removal
Graticule Light Removal and Replacement
CRT Removal
Replacement of the CRT
Removing the Rear Panel
Removing the Front Panel Circuit Board
Removing the Main Board
Removing the Power Supply Board
Repackaging
Identification Tag
Repackaging for Shipment
Figure 6-8: Repackaging
Section 7 Options
Options
Power Cord Options
Field Upgrade Kits
Cabinets
Plain Cabinet (1700F00)
Carrying Case (1700F02)
Side-By-Side Rack Adapter (1700F05)
Ordering
Section 8 Replaceable Electrical Parts
Parts Ordering Information
Using the Replaceable Electrical Parts List
Section 8 Replaceable Electrical Parts
Section 9 Diagrams/Circuit Board Illustrations
Section 10 Replaceable Mechanical Parts
Section 10 Replaceable Mechanical Parts
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Table of Contents
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Table 1-1: Signal Input
3
Table 1-3: Xy Mode
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Enlarged version
Instruction Manual
1720/1721
Vectorscope (S/N B060000 & Above)
070-5846-06
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.
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Troubleshooting
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Specific Troubleshooting Procedures
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