CS Analyst™ allows you to rapidly compute voltage and current induced by energy coupled to power and signal wiring by low frequency electromagnetic fields and injected interference.

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
Conducted 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™
– Audio and radio frequency noise emitted on cables
• Conducted Susceptibility – CS Analyst™
– Interference induced by noise on cabling
• Radiated Emissions – RE Analyst™
– Electric and magnetic fields emitted by cables
• Radiated Susceptibility – RS Analyst™
– Noise induced by electromagnetic fields on cables

3. EMI Analyst™EMI Analyst™
What does CS Analyst™ do?
Calculates current and voltage induced in end circuits when
signals are injected on or coupled to cabling

4. EMI Analyst™EMI Analyst™
EMI Analyst™ Covers All Frequency Domain
Conducted Susceptibility Test Specifications
• All industries
– Consumer and Industrial
– Aviation
– Automotive
– Military and Space
• Frequency Ranges
– Audio Frequency, 10 Hz – 150 kHz
– Radio Frequency, 10 kHz – 400 MHz

5. EMI Analyst™
Typical Audio Frequency CS Setup
• Military and Space
– MIL-STD-461C – CS01,
– MIL-STD-461D, E, F, G – CS101,
• Automotive
– ISO 11452-10
• Aviation
– DO-160C, D, E, F, G, Section 18
• Consumer and Industrial
– IEC EN 61000-4-17

6. EMI Analyst™
Typical Radio Frequency CS Setup
• Military and Space
– MIL-STD-461C – CS02,
– MIL-STD-461D, E, F, G – CS114,
• Automotive
– ISO 11451-4, ISO 11452-4, -7, -10
• Aviation
– DO-160C, D, E, F, G, Section 20
• Consumer and Industrial
– IEC EN 61000-4-6

7. EMI Analyst™EMI Analyst™
What Information is Needed?
Before you start the analysis, collect:
– Frequency Range
– Injected Signal Level
– Threshold Level and Method
– Cabling configuration
– End Circuits
– Pass/Fail Criteria
(susceptibility threshold)

8. EMI Analyst™EMI Analyst™
Switch Mode Power Converter
– MIL-STD-461F, CS114
Conducted 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
10 kHz – 200 MHz
Injected Signal Level
69 – 109 dBuA
Threshold Level, Method
Pretest Cal. – Closed Loop
Cabling configuration
Shielded wire pair over
ground plane, conductive
fabric tape shield
End Circuits
EMI filter (L)
LISN & Power Supply (R)
Pass/Fail Criteria
100 mV max. at power
converter input terminals

9. EMI Analyst™EMI Analyst™
Frequency Range
• Analysis Start & Stop Frequencies
• Scale: Log or Linear
• Resolution
– Pts / Decade for Log Scale
– Hz for Linear Scale
• Example: MIL-STD-461F, CS114
– Freq: 10 kHz – 200 MHz
– Scale: Log
– Res: 100 pts / dec
• 48 ppd, 10 kHz – 1 MHz
• 231 ppd, 1 MHz – 30 MHz
• 462 ppd, 30 MHz – 200 MHz
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/frequency.htm

10. EMI Analyst™EMI Analyst™
CS114 Injection Level
• MIL-STD-461F, CS114, Curve 3
– Limit establishes maximum current
injected on cables
• 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

11. EMI Analyst™
CS114 Pretest Calibration
• Current limit establishes forward drive level for
test.
• Injection probe is placed in calibration fixture
– 50 ohm dummy load
– 50 ohm measurement receiver
– 100 ohms total
• Forward drive required to generated specified
current level is recorded at each frequency
• During test, the lesser of
– Recorded drive level
– Current limit +6 dB
is applied
• Hint: The current limit +6 dB will be reached if
the series impedance of the cable and the end
circuits is less than 50 ohms.

12. EMI Analyst™EMI Analyst™
Threshold Level and Method
• For CS114, Threshold Method is Closed
Loop
– 100 ohm calibration fixture impedance
– Pretest units are dBuV because current limit
is in dBuA
– Margin units are same a Limit units, dBuA
– Margin is 6 dB
• For reference, MIL-STD-461 states:
“The EUT … (is to be) subjected to an injection probe drive
level which has been pre-calibrated to the appropriate
current limit…
“Requirements are also met if the EUT is not susceptible at
forward power levels sensed by the directional coupler
that are below those determined during calibration
provided that the actual current induced in the cable
under test is 6 dB or greater than the calibration limit.”
HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/fielddirection.htm

13. 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

14. EMI Analyst™
Cabling Configuration
• Shielded Wire Pair Over Ground
Plane
– #18 AWG wires
– Twisted, shielded pair
– 5 cm above aluminum ground plane
per MIL-STD-461F
– Fabric tape shield. Properties
defined on Transfer Impedance
form (next)

15. EMI Analyst™
Conductive Fabric Tape Shield
• Laird 86203 Nickel/Copper Black
Fabric Tape
Metalized Fabric
Conductive Adhesive
Release Paper

16. EMI Analyst™
Conductive Fabric Tape Properties
• Conductive Layer
– Nickel over Copper-plated polyester fabric
• Adhesive Layer
– Acrylic, conductive
Metalized Fabric
Conductive Adhesive
Release Paper
0.13 mm
Metalized Fabric
Conductive Adhesive
Non-Conductive Surface
I
V
RX-Y = 0.06 Ω / sq.
ASTM F390
Metalized Fabric
Conductive Adhesive
Metal Plate
Metal Plate
VI
1 square-inch area
MIL-STD-202 Method 303, 5 psi
RZ = 0.04 Ω / sq.-in.
= 25.8 µΩ / sq.-m

17. EMI Analyst™
Fabric Resistivity and Adhesive Resistivity
• Thickness of metalized fabric is not specified
– Fabric + Adhesive = 0.13 mm
– Assume fabric is 0.065 mm (half)
• Surface Resistivity
– 𝑅 𝑆 =
𝜌
𝑡
Ω
𝑠𝑞𝑢𝑎𝑟𝑒
– 𝜌 𝑓𝑎𝑏𝑟𝑖𝑐 = 𝑡𝑅 𝑆 = 0.065 𝑚𝑚 𝑥 0.06
Ω
𝑠𝑞𝑢𝑎𝑟𝑒
=
3.9 𝑥 10−6
Ω − 𝑚
– 𝜌𝑐𝑢 = 1.68 𝑥 10−8
Ω − 𝑚
– 𝜌 𝑟 𝑓𝑎𝑏𝑟𝑖𝑐
𝜌 𝑓𝑎𝑏𝑟𝑖𝑐
𝜌 𝑐𝑢
=232.14
• Adhesive Resistivity
– 𝜌 𝑎𝑑ℎ𝑒𝑠𝑖𝑣𝑒 = 25.8
Ω
𝑠𝑞.−𝑚
,
assuming metallized fabric is much more
conductive than adhesive

18. 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

19. 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

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

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

22. EMI Analyst™EMI Analyst™
Analysis Results – Animated
Voltage across cable, 10 kHz to 200 MHz
– Line-to-Ground (green)
– Line-to-Line (red)
CS114 Injection Point

23. EMI Analyst™EMI Analyst™
Analysis Results – 3D
• Rotate – Click + drag
• Zoom – Ctrl + drag
• Move – Shift + drag
Shown: Voltage,
Line-to-Line

24. 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
2 mV max.
Pass/Fail Criteria:
100 mV  1 GHz