Tektronix 784A Uživatelský manuál stáhnout pdf (Strana 70)

Operating Instructions

2–16

TDS 684A, TDS 744A, & TDS 784A Service Manual

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 293 294

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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