Tektronix 1725 Manuals

Manuals and User Guides for Tektronix 1725. We have 1 Tektronix 1725 manual available for free PDF download: Instruction Manual

Tektronix 1725 Instruction Manual (243 pages)

PAL/NTSC Vectorscope

Brand: Tektronix | Category: Test Equipment | Size: 4.23 MB

Table of Contents
6
Section 1 Introduction
20
Accessories
23
Standard Accessories (Included with Instrument)
23
Optional Accessories (Ordered Separately)
23
Field-Installable Upgrades
23
Power Cord Options
23
Safety Information
24
Specification
24
Table 1-1: Signal and External Reference Inputs
25
Table 1-2: Vector Mode
25
Table 1-3: X y Mode
27
Table 1-4: CRT Display
27
Table 1-5: Power Source
28
Table 1-6: Environmental Characteristics
28
Table 1-7: Certification
28
Table 1-8: Physical Characteristics
30
Operating Instructions
32
Section 2 Operating Instructions
34
Front-Panel Controls and Indicators
34
Figure 2-1: 1725 Front Panel Controls and Indicators
34
Input
35
Gain
36
Phase
36
Display
37
Miscellaneous
37
Rear-Panel Connectors
38
Figure 2-2: 1725 Rear Panel
38
BNC Connectors
39
Subminiature D-Type Connectors
39
Power Input
40
Miscellaneous
40
Using the 1725 in Auxiliary Mode
40
INPUT Switching
40
REF Switching
40
Line Select
41
Store
41
Recall
41
Operator's Checkout Procedure
41
Figure 2-3: Initial Equipment Connections for Operators Checkout Procedure
43
Figure 2-4: Typical 1725 Vector Display
44
Figure 2-5: Modulated Staircase Waveform Shown on a 1725
45
Figure 2-6: 1725 Test Circle Display
46
Measurement Graticule
47
Measurement Applications
48
Figure 2-7: 1725 PAL/NTSC Vectorscope Graticule
48
Color Measurements
49
Figure 2-8: NTSC Standard Color Phase Vector Diagram
49
Figure 2-9: PAL Standard Color Phase Vector Target
50
Figure 2-10: NTSC and PAL 75% and 100% Burst Targets on 1725 Graticule
50
Functional Use of the Vector Graticule
51
Measurement of Color Bars
51
Figure 2-11: Fine Detail of the 1725 Graticule Magenta Target
52
Differential Gain and Phase Measurements
53
Figure 2-12: Relationship of I and Q Modulation Amplitudes to Vector Targets
53
Figure 2-13: Relationship of U and V Modulation Amplitudes to Vector Targets
53
Matching Color Signals
54
Figure 2-14: Differential Phase and Gain Scales Showing Simulated 10° Differential Phase
54
Looking at Incidental Carrier Phase Modulation
55
Y Measurements
55
Figure 2-15: Measuring Stereo Audio Phase Difference in X and y Axes
56
Section 3 Installation
60
Packaging
62
Electrical Installation
62
Power Source
62
Mains Frequency and Voltage Ranges
62
Operating Options
62
Figure 3-1: Jumper Locations on the Main Board
63
Table 3-1: Internal Jumper Selection
63
Y INPUT Connector
64
Figure 3-2: REMOTE Connector Pin Functions
64
AUXILIARY Connector
65
Mechanical Installation
65
Cabinetizing
65
Figure 3-3: AUXILIARY Connector Pin Functions
65
Table 3-2: AUXILIARY Connector Pin Assignments
65
Figure 3-4: Dimensions of the 1700F00 Plain Cabinet
66
Securing the Instrument in Its Cabinet
67
Figure 3-5: 1700F02 Portable Cabinet
67
Rack Mounting
68
Figure 3-7: the 1700F05 Side-By-Side Rack Adapter
69
Figure 3-8: a 1700-Series Instrument Mounted in a 1700F05 Cabinet with a Blank Front Panel (1700F06)
69
Custom Installation
70
Figure 3-9: a 1700F05 Side-By-Side Rack Mounting Cabinet with an Instrument and a 1700F07 Utility
70
Figure 3-10: Considerations for Custom Installation of an Instrument
71
Theory of Operation
72
Section 4 Theory of Operation
74
Overview
74
Block Diagram
75
Video Input
75
Luminance Processing
75
Microcontroller
76
Gain Cell
76
Figure 4-1: Simple Block Diagram of a Vectorscope
76
Chrominance Processing
77
Demodulators
77
Output Amplifiers
77
CRT Blanking
78
Circuit Descriptions
78
Video Input Amplifiers
79
Gain Cell
79
Reference Switch
80
Chrominance Amplifier
80
Luminance Amplifier
80
Sync Separator
80
Bowes Oscillator
81
Burst Gate Generator
81
Standard Detector
81
Figure 4-2: Block Diagram of the Phase Locked Loop
82
45° Phase Flipper
83
Loop Phase Detector and Amplifier
83
Error Amplifier
83
Lock Detector and Amplifier
83
Burst Detector
84
PAL Phase Initializer
84
Vcxo
85
Phase Shift
86
Auto Zero
86
Post Regulators
86
Axis Switcher
87
Chrominance Demodulators
88
Demodulator Output Filters and Amplifiers
88
Vector Center Dot Position Clamp
88
Vertical and Horizontal Standard Dot Generators
89
XY Input Amps
90
Deflection Amplifiers
90
Center Dot Comparators
90
CRT Blanking
91
Figure 4-3: Dot Timing Signals for U6
91
Microprocessor
93
Z Axis Control
94
Focus Control
95
Trace Rotation
95
Graticule Illumination
95
Switches
95
Controls
95
Indicators
95
Line Rectifier and Filter
96
Pulse Width Modulator
97
Output Filters
98
Error Amplifier
98
Feedback Transformer Driver and Peak Detector
98
Output Under-Voltage Shutdown
98
HV Osc and Error Amp
99
Power Supply Outputs
99
Focus Amplifier
99
Grid Drive Circuit
99
Z Axis Amplifier
100
Figure 4-4: Pinout of the CRT Socket
100
Section 5 Checks and Adjustments
102
Recommended Equipment List
104
Electrical Instruments
104
Auxilliary Equipment
106
Performance Check
107
Short Form Performance Check
107
Figure 5-1: XY Input Test Connector
107
Long Form Performance Check
111
Table 5-1: Preliminary Control Settings
111
Figure 5-2: Initial Equipment Connections for Performance Checks
112
Adjustment Procedure
128
Short Form Adjustment Procedure
128
Long Form Adjustment Procedure
131
Table 5-2: Preliminary Control Settings
132
Section 6 Maintenance
142
Preventive Maintenance
144
Cleaning
144
Visual Inspection
145
Static-Sensitive Components
145
Table 6-1: Static Susceptibility
145
Performance Checks and Readjustments
146
Troubleshooting
147
Foldout Pages
147
Parts Lists
148
Major Assembly Interconnection
148
General Troubleshooting Techniques
149
Specific Troubleshooting Procedures
151
Power Supply
151
Troubleshooting Procedure
151
Introduction
152
Low Volts Supply
152
Table 6-2: Power Supply Fault Symptoms
152
Table 6-3: Low Volts Supply Voltages
152
Table 6-4: Control Circuit Test Points
154
High Volts Supply
155
Table 6-5: High Volts Supply Fault Symptoms
155
Table 6-6: High Voltage Oscillator Test Points
156
Serial Port and LED Driver Diagnostics
157
Corrective Maintenance
158
Obtaining Replacement Parts
158
Mechanical Disassembly/Assembly
159
Bezel Removal
159
Graticule Light Removal and Replacement
160
CRT Removal
161
Replacement of the CRT
161
Removing the Rear Panel
162
Removing the Main Board
164
Removing the Power Supply Board
164
Repackaging
166
Identification Tag
166
Repackaging for Shipment
166
Section 7 Options
168
Cabinets
170
Plain Cabinet (1700F00)
170
Carrying Case (1700F02)
170
Side-By-Side Rack Adapter (1700F05)
170
Ordering
170
Replaceable Electrical Parts
172
Section 8 Replaceable Electrical Parts
174
Parts Ordering Information
174
Using the Replaceable Electrical Parts List
174
Column Descriptions
175
Cross Index-Mfr. Code Number to Manufacturer
176
Diagrams/Circuit Board Illustrations
206
Section 9 Diagrams/Circuit Board Illustrations
208
Replaceable Mechanical Parts
234
Section 10 Replaceable Mechanical Parts
236
Parts Ordering Information
236
Using the Replaceable Mechanical Parts List
236
Column Descriptions
237
Cross Index-Mfr. Code Number to Manufacturer
238

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