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The Technician's EMI Handbook : Clues and Solutions - Joseph Carr

The Technician's EMI Handbook

Clues and Solutions

Paperback Published: 21st June 2000
ISBN: 9780750672337
Number Of Pages: 264

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A hands-on guide to finding the sources of electromagnetic interference and then fixing the problems. Includes basic theory of EMI as well as detailed explanations of why this problem is becoming more serious as the international scope of the communications and electronics industries grow. This book is not a textbook, but rather a handbook that will become a constant source of reference for anyone who runs into trouble with EMI. Includes chapters on grounding, circuit shielding and filtering, preventing EMI in circuit design, as well as EMI sources such as power lines, transmitters, television, consumer electronics, telephones, automobiles, and the ever-frustrating mystery EMI.

There are very few other books available even though EMI is constantly discussed and cursed. Most of the books on the market are about how to prevent EMI in circuit design or approaches to understanding the theory behind EMI. Though this information is important, especially to an engineering audience, these books hold no value at all to the technicians and hands-on practitioners in the fields of communications and servicing.These savvy professionals know that the book they are looking for and need is just not on the market. To get the information they need, this group is forced to read every magazine article they can find on the subject and rely on the advice of other professionals whether through technician groups or newsgroups. This book fills a void in the telecommunications and electronics industries by providing practical troubleshooting information.
Addresses the technician's needs and interests
Written by an eminent authority in the field
Covers correction and prevention of problems with EMI

Industry Reviews

This book is not a textbook, but rather a handbook that will become a constant source of reference for anyone who runs into trouble with EMI. -Electronic Servicing & Technology

Prefacep. xi
Introduction to the EMI Problemp. 1
Electrical and Electromagnetic Fundamentalsp. 5
What Is Electricity?p. 5
Positive and Negative Electricityp. 5
Electronic Model of the Atomp. 6
The Bohr Model of the Atomp. 7
Electron Shellsp. 8
Electron Subshells and Electron Spinp. 9
Electron Valence and Free Electronsp. 9
Conductors, Insulators, and Semiconductorsp. 10
The Unit of Electric Chargep. 11
Electrical Polaritiesp. 11
Millikan's Oil Drop Experimentp. 13
Electrical Potentialp. 13
Electrical Current and Its Unitsp. 15
Electrical Current vs Electrical Chargep. 15
Types of Current Flowp. 15
Resistance to Electrical Currentp. 16
Conductancep. 17
Current Flow Directionp. 17
Electrical Powerp. 18
Electrical Sourcesp. 18
The Electromagnetic Fieldp. 19
Sources of Electromagnetic Interferencep. 21
Fundamentals of Electromagnetic Interferencep. 23
Fundamental Causes of EMIp. 23
The Antennap. 24
Modes of Entryp. 24
Differential-Mode vs Common-Mode Signalsp. 25
Equipment Design Considerationsp. 26
Radio-Frequency Radiationp. 26
Near Fields and Far Fieldsp. 27
Grounding Methods for RF Systemsp. 29
Schematic Symbolsp. 29
Different Groundsp. 30
Grounding Systemsp. 33
Ground Designsp. 34
Other Ground Electrodesp. 37
Installing Ground Rodsp. 41
Tower Groundingp. 43
Vertical Antenna Counterpoise Grounds ("Radials")p. 43
Conclusionp. 46
Shielding Electronic Circuitsp. 47
Approaches to Shieldingp. 49
Skin Effect and Skin Depthp. 50
Ground Planesp. 51
Shielded Boxesp. 52
Holes in Shieldsp. 53
Double Shieldingp. 55
Multicompartment Shieldingp. 55
Spray-On Shieldingp. 55
Connectors, Meters, and Dialsp. 55
Installing a Coaxial Connectorp. 57
Guard Shieldingp. 58
Grounding and Ground Loopsp. 62
Filtering Electronic Circuitsp. 65
Shieldingp. 65
Basic Types of Filtersp. 65
Filter Circuitsp. 67
R-C EMI/RFI Protectionp. 69
Feedthrough Capacitorsp. 70
Notch Filteringp. 72
Twin-Tee Notch Filter Networksp. 73
Active Twin-Tee Notch Filtersp. 74
Adjustable Bridged-Tee Circuitsp. 76
Gyrator Circuitsp. 77
General Guidelinesp. 78
Conclusionp. 79
AC Power-Line and Electrical Device EMIp. 81
120/240 Volt Electrical Systemp. 82
Noisep. 83
Regulatory/Legal Issuesp. 83
Corona and Sparkp. 84
Safetyp. 85
Locating EMI Sourcesp. 85
Filter Solutionp. 85
Electric Motorsp. 86
Common-Mode Filteringp. 86
Controlling Transmitter Spurious Emissionsp. 89
Types of Transmitterp. 89
Operating the Transmitterp. 93
What to Do?p. 96
Be Wary!p. 99
Transmitter Test Setupp. 99
Third-Harmonic or Higherp. 100
VHF and Up Transmittersp. 101
Telephones and EMIp. 103
The Federal Communications Commissionp. 103
The Telephone Companyp. 103
The Radio Ownerp. 104
The Telephone Manufacturerp. 104
The Telephone Ownerp. 104
Technical Issuesp. 104
Twisted Pair, Flat (Parallel), and Shielded Wiringp. 105
Common Mode vs Differential Modep. 106
Resonancesp. 106
Telephone Groundp. 106
Corrosionp. 106
Substandard Wiringp. 106
Telephone Classificationp. 107
Telephone Registration Numbersp. 107
Capacitorsp. 107
Common-Mode RF Chokesp. 107
Filteringp. 108
Noise Cancellation Bridgesp. 113
A Simple Bridge Circuitp. 116
A Different Bridgep. 119
Conclusionp. 119
Locating EMI Sourcesp. 121
RF Sleuthing Toolsp. 121
RF Detectorsp. 125
Radio Direction Findingp. 126
Field Improvisationp. 130
Regular Loop Antennasp. 130
Sense Antenna Circuitp. 131
Switched Pattern RDF Antennasp. 132
EMI to Television, Cable TV, and VCR Equipmentp. 135
The Basic Television Receiverp. 135
Fundamental Overloadp. 137
Harmonic Overloadp. 137
Audio Rectificationp. 137
IMD Interferencep. 137
IF Interferencep. 138
Direct Pickupp. 138
Common-Mode vs Differential-Mode Signalsp. 138
Common-Mode Filtersp. 138
Filteringp. 139
Stubs for EMI Eliminationp. 140
Faraday Shielded Coaxial Cablep. 140
Cable Television Systemsp. 141
Two-Way CATVp. 142
Channelizationp. 142
Leakagep. 142
Responsibilityp. 142
Finding Leaksp. 142
What to Do When the Interference Is at the Subscriber Endp. 143
What to Do When the Customer Is at Faultp. 143
VCRsp. 143
EMI to Consumer Electronicsp. 145
Roles and Responsibilitiesp. 145
The Source of the Problemp. 146
Typical Audio Systemp. 146
Pathways for Troublep. 147
Troubleshootingp. 147
Curesp. 148
Shieldingp. 149
Groundingp. 149
EMI from Computersp. 151
The Lawp. 151
The Problems with Computersp. 151
Cabinetryp. 153
Troubleshooting Computer EMIp. 154
The Role of Ferrite Chokesp. 154
Ground Loopsp. 155
EMI to Computersp. 155
Mystery EMI: Rusty Downspouts and All Thatp. 157
Moodie and the Crown Vickiep. 157
The High Hum Level--FM Broadcasting Stationp. 158
The Slack Coax Caperp. 158
Lesson Learned: Don't Complain Too Loudlyp. 159
Rusty Downspoutsp. 161
Radio Receiver Basicsp. 163
Signals, Noise, and Receptionp. 163
Thermal Noisep. 164
The Reception Problemp. 165
Strategiesp. 165
Radio Receiver Specificationsp. 166
Originsp. 166
Superheterodyne Receiversp. 168
Receiver Performance Factorsp. 172
Units of Measurep. 172
Noisep. 173
Signal-to-Noise Ratio (SNR or S[subscript n])p. 176
Noise Factor, Noise Figure, and Noise Temperaturep. 176
Noise in Cascade Amplifiersp. 177
Receiver Noise Floorp. 178
Static Measures of Receiver Performancep. 178
Sensitivityp. 178
Selectivityp. 182
Stabilityp. 186
AGC Range and Thresholdp. 186
Dynamic Performancep. 187
Intermodulation Productsp. 187
-1 dB Compression Pointp. 188
Third-Order Intercept Pointp. 189
Dynamic Rangep. 191
Blockingp. 192
Cross-Modulationp. 192
Reciprocal Mixingp. 194
IF Notch Rejectionp. 194
Internal Spuriip. 195
Dealing with Radio Receiver System EMIp. 197
Intermod Hill: A Tale of Woep. 198
The Problemp. 199
The Attenuator Solutionp. 202
The Antenna Solutionp. 202
The Filter Solutionp. 203
Transmission Line Stubsp. 207
Shieldingp. 207
Expected Resultsp. 208
Difficult Casesp. 208
The Solutionsp. 208
Electrostatic Discharge (ESD)p. 209
ESD Effectsp. 211
Identification by Classp. 211
ESD Control Proceduresp. 212
Work Areasp. 212
Protective Flooringp. 212
Workbenchesp. 212
Equipmentp. 213
Clothingp. 213
ESD-Protective Materialsp. 213
Regulatory Issuesp. 215
Anechoic Chambers and OATSp. 216
Screened Roomsp. 218
Automotive Interference Solutionsp. 219
ARRL Technical Information Service Information on Automobile-Radio Interference (Both Ways)p. 219
Automotive Interference Problems: What the Manufacturers Sayp. 219
Wheels Start to Turnp. 221
ARRL Surveys Auto Manufacturersp. 221
What the Manufacturers Sayp. 223
By Ed Hare, W1RFI, ARRL Laboratory Supervisorp. 230
FDA Documents on EMIp. 235
CDRH Medical Device Electromagnetic Compatibility Programp. 235
Typical Electromagnetic Environment for Medical Devicesp. 235
CDRH Medical Device Electromagnetic Compatibility Programp. 235
Medical Devices and EMI: The FDA Perspectivep. 235
The EMI Problemp. 236
The Complexity of Device EMIp. 236
FDA Concern with EMIp. 237
Formation of the CDRH EMC Working Groupp. 237
Plans for Device EMCp. 238
Research and Standardsp. 239
Work with Other Agenciesp. 239
Some Accomplishments to Datep. 240
Summaryp. 241
Referencesp. 241
Electromagnetic Interference (EMI) Testing of Medical Devicesp. 243
New Documents Available to Help Resolve Medical Device EMC Problemsp. 246
Indexp. 249
Table of Contents provided by Syndetics. All Rights Reserved.

ISBN: 9780750672337
ISBN-10: 0750672331
Audience: General
Format: Paperback
Language: English
Number Of Pages: 264
Published: 21st June 2000
Country of Publication: US
Dimensions (cm): 26.04 x 17.42  x 1.45
Weight (kg): 0.52

Earn 339 Qantas Points
on this Book