Cover image for EMI troubleshooting techniques
EMI troubleshooting techniques
Mardiguian, Michel.
Personal Author:
Publication Information:
New York : McGraw-Hill, [2000]

Physical Description:
xiii, 301 pages : illustrations ; 24 cm
Format :


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TK7867.2 .M37 2000 Adult Non-Fiction Non-Fiction Area

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Stop EMI, EMD and RFI cold!
Now you can get the newest, most effective weapons to fight costly and potentially devastating electromagnetic interference (EMI), electromagnetic discharge (EMD), and radio frequency interference (RFI) in the field or on the bench. EMI Troubleshooting Techniques, by Michel Marduian, arms you with an arsenal of fail-safe, time- and labor-saving diagnostic routines to help you pinpoint and lock out even the most persistent interference problems. Its 4-step approach lets you 1) identify specific (and even hidden) trouble symptoms, 2) find the matching solutions, 3) implement them and 4) understand their strengths and limitations. From power line filters and conduction type fixes to transient suppressors and radiation control, this time-and money-saving guide streamlines robust designs, speeds on-site troubleshooting for industrial-strength applications, and simplifies EMC lab testing for optimal result. Plus, you get a variety of recommended filters, isolation transformers, shields, varistors, grounding and impedance devices, tapes, foils, and more.

Table of Contents

Prefacep. ix
Introductionp. xi
About the Authorp. xiii
Chapter 1 Introduction: Brush-Up on Some EMI/EMC Basicsp. 1
1.1 Terminologyp. 1
1.2 EMI/EMC Glossaryp. 2
1.3 Units of Measurement: the Belp. 5
1.4 Time-to-Frequency Conversionsp. 8
1.5 Sources, Victims, and Coupling Pathsp. 14
1.6 EMI Coupling Pathsp. 14
1.7 Victim Rejectionp. 20
Chapter 2 Optimal Selection of EMI Fixesp. 23
Chapter 3 Diagnostics, Troubleshooting Techniques, and Instrumentationp. 29
3.1 EMI Problems during Prototype and Qualification Phasesp. 29
3.2 Checking for Compliance with Emissions Specificationsp. 32
3.3 Checking for Compliance with Immunity Specificationsp. 59
3.4 EMI Problems in the Field (What to Do When Equipment Fails)p. 77
3.5 How to Evaluate Fix Results: Current and Field Probesp. 90
Chapter 4 Conduction-Type Fixesp. 103
4.1 Mode of Operation of Conduction Fixesp. 103
4.2 Series Attenuation Devices vs. Shunt Attenuationp. 104
Chapter 5 Capacitive Types of EMC Solutionsp. 111
5.1 Theoretical Briefp. 111
5.2 Dielectric Materials and Tolerancesp. 113
5.3 Capacitors for Differential-Mode (Line-to-Line) Filteringp. 113
5.4 PC Board Capacitive Bus Bars and Flat Pack Capacitorsp. 117
5.5 Capacitors for Common-Mode (Line-to-Ground/Chassis) Filteringp. 120
5.6 Prescriptions, Installationp. 126
5.7 Filtered Connectors and Adaptorsp. 128
Chapter 6 Inductive, Series-Loss EMC Solutionsp. 135
6.1 Theoretical Briefp. 135
6.2 Core Materialsp. 137
6.3 Ferrites and Ferrite-Loaded Cablesp. 139
6.4 Inductors, DM and CMp. 152
6.5 Ground Chokesp. 156
6.6 Common-Mode Bifilar Chokes (Longitudinal Transformers)p. 158
6.7 Combined L,C Elementp. 159
Chapter 7 Power-Line Filtersp. 167
Chapter 8 Power-Line Isolation Transformers, Power Conditioners, and Uninterruptible Power Suppliesp. 175
8.1 Power-Line Isolation Transformersp. 175
8.2 Faraday-Shielded Transformersp. 177
8.3 Power Conditioners and UPSsp. 179
Chapter 9 Signal-Type Isolation Transformersp. 185
Chapter 10 Transient Suppressorsp. 191
10.1 Solid State Varistors, Transzorbsp. 191
10.2 Gas Tubesp. 197
Chapter 11 Bonding, Ground Continuity, and RF Impedance Reductionp. 203
11.1 Grounding Braids and Strapsp. 203
11.2 PCB Grounding Spacersp. 204
11.3 Metallic Cable Raceways and Companion Braidsp. 206
11.4 Floor Impedance Reduction, RMF Grounding Padsp. 210
11.5 Transient Platep. 215
Chapter 12 Radiation-Type Fixesp. 219
12.1 Conductive Tapesp. 219
12.2 Shielding Mesh Bands and Zipper Jacketsp. 223
12.3 Cable Shields, Connections, and Fittingsp. 225
12.4 EMI Gasketsp. 238
12.5 EMI Screens for Windows and Ventilation Panelsp. 244
12.6 Conductive Paintp. 247
12.7 Conductive Foilp. 251
12.8 Conductive Fabricp. 253
Chapter 13 EMI Problems During EMC Tests: Practical Hintsp. 259
13.1 Validation of the Measurementsp. 259
13.2 Instrument-Related Errorsp. 260
13.3 Problems with Weak Signals and Strong Background Noisep. 260
13.4 Setup- and Accessory-Related Errorsp. 261
13.5 LISN-Related Errorsp. 264
13.6 Mismatch and VSWR-Related Errorsp. 264
13.7 Background Noise Carried by the Instrumentation Setupp. 264
Appendix A Receiver Sensitivity versus Bandwidth and Noise Figurep. 269
Appendix B EMI from Switched-Mode Power Convertersp. 271
B.1 Conducted EMI (CM and DM) into 50 [Omega]/50 [mu]H LISN (or Translated Equivalent) with CISPR Receiverp. 271
Appendix C Ambient Fields from Radio Transmittersp. 273
Appendix D Impedance of Copper and Steel Planesp. 275
Appendix E Voltage Induced by a Field into a Loopp. 277
Appendix F Wire-to-Wire Capacitance and Mutual Inductance for Crosstalk Estimationp. 279
F.1 Wire-to-Wire Capacitance for Crosstalk Estimationp. 279
F.2 Wire-to-Wire Mutual Inductance for Magnetic Crosstalk Estimation (courtesy of AEMC)p. 281
Appendix G Conversion of Radiated Emission Limits into CM Current Limitsp. 283
Appendix H Filter and Input Circuit Universal Rejection Curvesp. 285
Appendix I EMI Fixes Toolbox: Recommended Parts Listp. 287
I.1 Instruments and Accessoriesp. 287
I.2 Componentsp. 288
Appendix J Test Data Report Forms for Conducted and Radiated Emissions, ESD, and EFTp. 289
J.1 Conducted EMI Test Log Sheetp. 290
J.2 Radiated EMI Test Log Sheetp. 291
J.3 ESD Test Log Sheetp. 292
J.4 Electrical Fast Transient (EFT) Test Log Sheetp. 293
Appendix K HF Losses with Coaxial Cablesp. 295
Referencesp. 297
Indexp. 299