Tektronix VITS100 Manuale Utente Pagina 101
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Adjustment Procedures
VITS100 NTSC VITS Inserter Instruction Manual
6–3
With the exception of the video signal connection, this step is the starting point
for any adjustment.
H Disconnect power and remove the cabinet. See the Maintenance section of
this manual for instructions.
H Connect the VITS inserter AC power cord to the variable autotransformer.
Turn the power on and set the autotransformer to 110 V.
H Connect a 75 W coaxial cable from the television test signal generator output
to the VITS inserter PROGRAM IN.
H Turn on all test equipment and allow for any required warm-up period.
H Figure 6–1 shows the location of adjustments and test points (TP) used in
this procedure.
Preliminary Setup
- Instruction Manual 1
- NTSC VITS Inserter 1
- 070-8333-02 1
- WARRANTY 3
- Service Assurance 5
- Table of Contents 7
- List of Figures 9
- List of Tables 11
- General Safety Summary 13
- Service Safety Summary 15
- Getting Started 17
- Accessories and Options 20
- Functional Check 21
- Installation 23
- Operating Basics 25
- Rear Panel 28
- Insertion Options 29
- Passing Program Video 30
- Auto VIRS 30
- Inserting a Source ID 30
- VITS Selection 31
- Switch/Line Assignments 32
- Switch Settings 33
- Remote Control 34
- Specifications 35
- Waveform Diagrams 48
- Figure 3–2: 7.5% Black 49
- Figure 3–3: 50% Gray 49
- Figure 3–4: FCC Color Bars 50
- Figure 3–5: FCC Composite 50
- Figure 3–6: Multiburst 51
- Figure 3–7: Multipulse 51
- Figure 3–8: NTC7 Combination 52
- Figure 3–9: NTC7 Composite 52
- Figure 3–10: Red Field 53
- Figure 3–11: SIN X/X 53
- Figure 3–12: VIRS 54
- Figure 3–13: Cable Multiburst 54
- Figure 3–14: Cable Sweep 55
- Theory of Operation 59
- Circuit Description 62
- Signal and Switching 65
- Source ID Generation 65
- Power Supply 66
- Performance Verification 71
- Equipment Required 74
- Verification Procedure 75
- Select VITS 76
- Line Input Range 78
- Program Channel to 78
- Test Signal Matching 78
- Phase Match of 79
- Inserted Test Signal to 79
- Program Video Channel 79
- Phase Match Bypass Path 81
- Program Video Gain and 81
- Line Tilt 81
- Chrominance to 82
- Luminance 82
- Gain and Delay 82
- Differential 83
- Gain and Phase 83
- Pulse-to-Bar Ratio 83
- K-Factor 84
- SCH Phase 85
- Signal-to-Noise Ratio 85
- Hum Rejection 85
- Luminance Risetime 86
- Chrominance Risetime 87
- Genlock Checks 87
- Return Loss and 90
- Input/Output Impedance 90
- Center Frequency 10 MHz 91
- Reference Level 0 dB 91
- Freq Span/Div 10 MHz 91
- Frequency Response and 92
- Crosstalk 92
- Auto VIRS Insertion 94
- Source ID 95
- Adjustment Procedure 100
- Preliminary Setup 101
- Adjustment Procedures 102
- Power Supply Adjustment 103
- Genlock Adjustments 103
- Gain Adjustments 105
- Frequency Response 107
- Adjustments 107
- Frequency Range High 108
- Markers On 108
- Composite On 108
- Amplitude Full 108
- Sweep On 108
- OUTPUTINPUT 109
- Oscillator Adjustment 110
- Maintenance 111
- Preparation 114
- Static Sensitive Components 114
- Circuit Board Jumpers 116
- Mode Selection Jumpers 117
- Test Jumpers 117
- Table 7–2: Test Jumpers 118
- Cleaning and Inspection 119
- Top Cover 120
- Front Panel 120
- Inserter Circuit Board 121
- Oscillator Circuit Board 122
- Removal/Replacement 122
- Diagnostics 123
- Replaceable Electrical Parts 127
- Component Number 130
- Subassembly Number 130
- (optional) 130
- Diagrams 157
- 159
- 159
- Figure 9–2: A1A1 Oven Board 162
- TEST SIGNAL MEMORY 163
- TEST SIGNAL SELECT 2 165
- P/O A1 INSERTER BOARD 167
- CLAMP, AND SYNC 171
- STRIPPER 171
- VIDEO INPUT BUFFER 171
- VIRS DETECT 171
- A1A1 CRYSTAL OVEN BOARD 173
- ANALOG OUTPUT 7 175
- POWER SUPPLY 8 177
- Replaceable Mechanical Parts 187
- Abbreviations 190
- Chassis Parts 190
- Mfr. Code to Manufacturer 190
- Cross Index 190
- Figure 10–1: Exploded view 194
- Appendix 195
- Appendix A: Options 197
- Option 1J 198
- Factory Configuration 199
- Option 1M 200
- Option 1M Signals 201
- Option 2 202
- Figure A–5: Cable Multiburst 203
- Figure A–6: Cable Sweep 203
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