Tektronix 784A Manuel d'utilisateur Page 156
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Performance Tests
4–80
TDS 684A, TDS 744A, & TDS 784A Service Manual
Figure 4–38: Sync Duty Cycle Test: One-Div Neg Pulse Waveform
H Turn the pulse generator PULSE DURATION variable control to
adjust the negative pulse so the oscilloscope’s CH1 – Width
measurement displays 400ns +/–10 ns.
H Turn the HORIZONTAL SCALE knob to set the oscilloscope time
base to 5ms/div.
H Turn the pulse generator PERIOD variable control to adjust the
period until the oscilloscope CH1 Period measurement reads
21.000ms –25/+50 ns. See Figure 4–39. Read note shown below.
NOTE. The pulse duration and period adjustments are critical in making this
measurement. If the pulse duration and/or the duty cycle are not stable, the
FLEXFMT function may not function. You must take care when making these
adjustments.
- Service Manual 1
- Digitizing Oscilloscope 1
- 070-8992-03 1
- WARRANTY 3
- List of Figures 7
- Table of Contents 10
- List of Tables 11
- General Safety Summary 13
- Safety Terms and Symbols 14
- Symbols on the Product 15
- CSA Certified Power 15
- Service Safety Summary 17
- Manual Structure 19
- Manual Conventions 20
- Related Manuals 20
- Introduction 23
- Self Service 24
- Before You Begin 25
- Specifications 28
- User Interface 29
- Signal Acquisition System 29
- Horizontal System 30
- Trigger System 31
- Acquisition Control 31
- On-Board User Assistance 32
- Measurement Assistance 32
- Digital Signal Processing 33
- Nominal Traits 36
- Warranted Characteristics 42
- Typical Characteristics 48
- Installation 55
- Operating Voltage 56
- Operating Environment 57
- Repackaging Instructions 58
- Installed Options 59
- Operating Instructions 61
- How to Use Help 62
- How to Use the Status 62
- How to Set Functions 63
- How to Set Complex 66
- Functions 66
- Theory of Operation 72
- Tube Assembly 73
- Front Panel 74
- Rear Panel 74
- Low Voltage Power Supply 74
- Conventions 78
- Brief Procedures 81
- Verify Pass 82
- Highlight Cal 82
- Functional Tests 83
- Verify All Input Channels 84
- Verify the Time Base 86
- Verify the Main and 87
- Delayed Trigger Systems 87
- Verify the File System 89
- TDS 684A Test Record 95
- TDS 684A Test Record (Cont.) 96
- TDS 7XXA Test Record 99
- Performance Tests 100
- TDS 7XXA Test Record (Cont.) 100
- Check Offset Accuracy 103
- (Zero Setting) 103
- 0 V when the 104
- Check DC Voltage 105
- Measurement Accuracy 105
- Turn on the 108
- Check Analog Bandwidth 109
- Check Delay Between 113
- Channels 113
- Terminator 114
- Time Base System Checks 118
- Trigger System Checks 120
- Check Accuracy 124
- Trigger-Level or 124
- Threshold, DC Coupled 124
- Set DC calibration generator 126
- Read results 126
- Sensitivity, Edge Trigger 128
- DC Coupled 128
- Check if stable trigger 130
- Output Signal Checks 133
- Check output 135
- Check Probe 136
- Compensator Output 136
- Check Video Trigger 141
- Stop shows test complete 144
- Positive pulse 146
- Negative pulses 146
- 50 Cable 148
- Signal Generator 148
- Adjustment Procedures 160
- Optional Peripherals 161
- Test Equipment 161
- Performing the 161
- Adjustments 161
- Complete Adjustment 162
- Individual Adjustments 162
- Partial Adjustment 162
- Adjustment After Repair 163
- Adjustment Dependencies 163
- Equipment Required 164
- Adjustment Instructions 166
- Software-Based 167
- Unprotected 168
- Protected 168
- Compensate the Probe 169
- Probe compensated correctly 171
- Probe overcompensated 171
- Probe undercompensated 171
- Measure Probe Bandwidth 172
- Adjust the Probe — High 174
- Frequency Response 174
- Repeat for lower cover 175
- Not Used 178
- Display Assembly Adjustment 180
- 10% Patch 181
- 5% Patch 181
- Switch No. 1 2 3 4 5 6 7 8 182
- Closed X X X X X X X 182
- Maintenance 185
- Preparation 186
- Inspection and Cleaning 188
- Preparation — Please Read 193
- General Instructions 194
- Summary of Procedures 194
- Figure 6–1: External Modules 196
- A16 Power Supply 198
- Front Subpanel 198
- A30 Display 198
- Assembly 198
- Main Chassis 198
- Access Procedure 199
- Front-Panel Knobs 200
- Line Fuse and Line Cord 201
- tip (Items 1 and 3) 202
- EMI Gaskets 202
- Rear Cover and Cabinet 202
- Front Cover, Trim Ring 206
- Menu Buttons, and 206
- Attenuator Panel 206
- tip (Items 1 and 2) 207
- A12 Front-Panel Assembly 207
- Display-Frame Assembly 209
- Cabinet Modules 210
- A14 D1 Bus and 213
- Analog-Power and 213
- Digital-Power Cables 213
- Analog and Digital Power 214
- Cables (Interchangeable) 214
- A14 D1 Bus 214
- tip, remove the two screws 215
- A23 SerPar Board — 215
- RS232/Centronics 215
- Hardcopy Interface 215
- A29 Video Trigger Board 216
- Coax Cable 218
- To J1500 219
- A11 Processor/Display 220
- Top Cover and Board 221
- Brackets 221
- (Item 6). Have handy a 223
- Rear-Panel Cables 223
- A10 Acquisition Board 223
- Floppy Disk 226
- Rear Chassis 228
- CH3 OUT to J1201 229
- AUXILIARY TRIGGER to J1550 229
- MAIN TRIGGER to J1000 229
- DELAY TRIGGER to J1001 229
- A16 Low Voltage Power 230
- A30 Display Assembly 231
- Move circuit board 234
- Disassembly for Cleaning 237
- Troubleshooting 241
- Firmware Updates 242
- Options and Accessories 258
- Table 7–1: Options (Cont.) 259
- Standard Accessories 260
- Optional Accessories 261
- Accessory Software 262
- Warranty Information 262
- Service Assurance 262
- Electrical Parts List 265
- Diagrams 268
- Figure 9–1: Interconnections 269
- Figure 9–2: Block Diagram 271
- Mechanical Parts List 275
- Abbreviations 276
- Mfr. Code to Manufacturer 276
- Cross Index 276
- Manufacturers Cross Index 277
- Replaceable Parts List 280
- Figure 10–1: External Modules 281
- Figure 10–5: Cables, Top View 287
- Figure 10–6: Floppy Disk 289
- Figure 10–7: Accessories 290
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