Tektronix 784A manuals

Tektronix 784A User Manual (294 pages)

Brand: Tektronix | Category: Measuring, testing & control | Size: 4.12 MB |

English

Table of contents

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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