A brief explanation about radiated susceptibility, illustrative diagrams & process related to Electromagnetic Interference & Analysis.

1. EMI Analyst™
EMI ANALYST™ Software Suite
I n t u i t i v e  A c c u r a t e  E f f e c t i v e
Radiated susceptibility analysis
overview

2. EMI Analyst™EMI Analyst™
EMI Analyst™ is a 4-in-1 EMI Analysis Tool
EMI Analyst™ calculates electromagnetic interference for cable-
connected circuits
• Conducted Emissions – CE Analyst™
– AF and RF current and voltage emitted on cables
• Conducted Susceptibility – CS Analyst™
– Current and voltage induced by interference injected on or coupled to cabling
• Radiated Emissions – RE Analyst™
– Electric and magnetic fields emitted by cables
• Radiated Susceptibility – RS Analyst™
– Current and voltage induced by electromagnetic fields on cable

3. EMI Analyst™EMI Analyst™
What does RS Analyst™ do?
Calculates current and voltage induced on cabling and
end circuits by external electromagnetic fields

4. EMI Analyst™EMI Analyst™
EMI Analyst™ Covers All Radiated Susceptibility
Test Specifications
Simulates RS test setups for most EMI test configurations
– Consumer
– Industrial
– Aviation
– Automotive
– Military and Space

5. EMI Analyst™EMI Analyst™
Consumer and Industrial Electronics
• Radiated Immunity
Test Setup
• EN61000-4-3
– Edition 1, 2, 3
– Non-conductive table
– 1, 3, 10, 20, 30 V/m
– 1 m or 3 m test distance
– 80 MHz – 6 GHz

6. EMI Analyst™EMI Analyst™
Commercial Aircraft Electronics
• RF Radiated Susceptibility
Test Setup
• RTCA/DO-160G
– rev. D, E, F, G
– Copper test bench
– 1 V/m to 7000 V/m
– 1 m test distance
– 100 MHz to 18 GHz

7. EMI Analyst™EMI Analyst™
Automotive Electronics
• Radiated Immunity (ALSE)
Test Setup
(absorber lined shielded enclosure)
• ISO 11452-2
– 2nd Edition
– Copper test bench
– 25 V/m to 100+ V/m
– 1 m test distance
– 80 MHz to 4.2+ GHz

8. EMI Analyst™EMI Analyst™
Military and Space Electronics
• Radiated Susceptibility
Test Setup
• MIL-STD-461G RS03, RS103
– rev. C, D, E, F, G
– Copper test bench
– 5 V/m to 200+ V/m
– 1 m test distance
– 10 kHz to 40 GHz

9. EMI Analyst™EMI Analyst™
What Information is Needed?
Before you start the analysis,
collect
– Frequency Range
– Field Level
– Field direction, polarization
– Cabling configuration
– End Circuits
– Pass/Fail Criteria
(susceptibility threshold)

10. EMI Analyst™EMI Analyst™
Switch Mode Power Converter
– MIL-STD-461F, RS103 tailored
Radiated Susceptibility Example
Block
Diagram
Circuit
Schematic
Switch Mode
Power
Converter
EMI Filter Cable Conductors
LISNs
and
DC Power
Supply
StrayC
4.7uH
1uF 3.3uF
0.1uF
0.1uF
10 uH
10 uH
330 nF
10 nF
10 nF
100 uH
PS
Power Converter EMI Filter Cable Conductors LISNs and DC PS
Frequency Range
2 MHz – 18 GHz
Field Level
5 – 50 V/m
Field direction, polar.
Broadside, vertical
Cabling configuration
Unshielded wire pair
over ground plane
End Circuits
(L) EMI filter
(R) LISN & PS
Pass/Fail Criteria
100 mV  1 GHz
1 V > 1 GHz

11. EMI Analyst™EMI Analyst™
Frequency Range
• Start & Stop Frequency
• Scale: Log or Linear
• Resolution
– Pts / Decade for Log Scale
– Hz for Linear Scale
• Example: MIL-STD-461F
– Freq: 2 MHz – 18 GHz
– Scale: Log
– Res: 100 pts / dec
• 48 ppd, 2 MHz – 30 MHz
• 462 ppd, 30 MHz – 1 GHz
• 924 ppd, 1 GHz to 40 GHz
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/frequency.htm

12. EMI Analyst™EMI Analyst™
Field Level
• Field strength to which cables
are exposed
– E-field
– Far field source
• Frequency/Amplitude Pairs
– Enter in table
– Load/Save to template library
– Automatically graphed
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/limit1.htm

13. EMI Analyst™EMI Analyst™
Field Polarization and Direction
• Presets
– All RS tests are Broadside
– Most specs require vertical and
horizontal polarization
– Broadside, vertical usually worst
case
• Edit values
– Numeric entry
– Rotate – click + drag
• Edit appearance
– Zoom – Ctrl + drag
– Move – Shift + drag
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/fielddirection.htm

14. EMI Analyst™EMI Analyst™
Cabling Configuration
• 8 built-in templates
– 4 shielded, 4 unshielded
• Input
– Physical dimensions
– Conductor and dielectric
materials
• Computes
– Characteristic impedance
– R, L, C, G values
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/conductors1.htm

15. EMI Analyst™EMI Analyst™
End Circuits
• Schematic capture
– Ladder network
– Passive components (R, L, C,
and magnetically coupled)
• Left-End
– EMI filter for PS circuit
• Right-End
– LISN circuit
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/schematic.htm

16. EMI Analyst™EMI Analyst™
Left-End Circuit: EMI Filter
4.7uH
1uF 3.3uF
0.1uF
0.1uF
10 uH
10 uH
330 nF
10 nF
10 nF
100 uH
Input Power Filter Schematic
EMI Analyst™ Filter Schematic

17. EMI Analyst™EMI Analyst™
Right-End Circuit: LISN and DC Power Supply
LISN schematic
EMI Analyst™ LISN schematic
and power supply impedance

18. EMI Analyst™EMI Analyst™
Analysis Results – Conductors
• Voltage and current induced on cable conductors

19. EMI Analyst™EMI Analyst™
Analysis Results – Animated
• Input Z, DM and CM

20. EMI Analyst™EMI Analyst™
Analysis Results – 3D
• Rotate – Click + drag
• Zoom – Ctrl + drag
• Move – Shift + drag
Shown: Current on
Wire 1

21. EMI Analyst™EMI Analyst™
Analysis Results – Left End
• Induced DM voltage inboard of filtering
V
4.7uH
1uF 3.3uF
0.1uF
0.1uF
10 uH
10 uH
330 nF
10 nF
10 nF
100 uH
867 mV max.
Pass/Fail Criteria:
100 mV  1 GHz, 1 V > 1 GHz

22. EMI Analyst™EMI Analyst™
Learn More
For more information about RS Analyst™ and the other three
applications that make up the EMI Analyst™, visit
http://emisoftware.com.