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EMI ANALYST Software SuiteIntuitive Accurate Effective

Conducted susceptibility analysisoverview

EMI Analyst

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EMI Analyst is a 4-in-1 EMI Analysis ToolEMI Analyst calculates electromagnetic interference for cable-connected circuits

Conducted Emissions CE AnalystAudio and radio frequency noise emitted on cablesConducted Susceptibility CS AnalystInterference induced by noise on cablingRadiated Emissions RE AnalystElectric and magnetic fields emitted by cablesRadiated Susceptibility RS AnalystNoise induced by electromagnetic fields on cables

EMI Analyst

EMI AnalystWhat is EMI Analyst?2

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

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EMI AnalystEMI Analyst Covers All Frequency Domain Conducted Susceptibility Test SpecificationsAll industries Consumer and IndustrialAviationAutomotiveMilitary and SpaceFrequency RangesAudio Frequency, 10 Hz 150 kHzRadio Frequency, 10 kHz 400 MHz

EMI Analyst

EMI AnalystTypical Audio Frequency CS SetupMilitary and SpaceMIL-STD-461C CS01, MIL-STD-461D, E, F, G CS101, AutomotiveISO 11452-10AviationDO-160C, D, E, F, G, Section 18Consumer and IndustrialIEC EN 61000-4-17

EMI AnalystTypical Radio Frequency CS Setup Military and SpaceMIL-STD-461C CS02, MIL-STD-461D, E, F, G CS114, AutomotiveISO 11451-4, ISO 11452-4, -7, -10AviationDO-160C, D, E, F, G, Section 20Consumer and IndustrialIEC EN 61000-4-6

EMI AnalystWhat Information is Needed? Before you start the analysis, collect:Frequency RangeInjected Signal LevelThreshold Level and MethodCabling configurationEnd CircuitsPass/Fail Criteria(susceptibility threshold)

EMI Analyst

EMI AnalystSwitch Mode Power ConverterMIL-STD-461F, CS114Conducted Susceptibility ExampleBlockDiagramCircuit Schematic

Frequency Range10 kHz 200 MHzInjected Signal Level69 109 dBuAThreshold Level, MethodPretest Cal. Closed LoopCabling configurationShielded wire pair over ground plane, conductive fabric tape shieldEnd CircuitsEMI filter (L) LISN & Power Supply (R) Pass/Fail Criteria100 mV max. at power converter input terminals

EMI Analyst

EMI Analyst

Frequency RangeAnalysis Start & Stop FrequenciesScale: Log or LinearResolutionPts / Decade for Log ScaleHz for Linear Scale

Example: MIL-STD-461F, CS114Freq: 10 kHz 200 MHzScale: LogRes: 100 pts / dec48 ppd, 10 kHz 1 MHz231 ppd, 1 MHz 30 MHz462 ppd, 30 MHz 200 MHzHELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/frequency.htm

EMI Analyst

EMI AnalystCS114 Injection LevelMIL-STD-461F, CS114, Curve 3Limit establishes maximum current injected on cablesFrequency/Amplitude PairsEnter in tableLoad/Save to template libraryAutomatically graphed

HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/limit1.htm

EMI Analyst

EMI AnalystCS114 Pretest CalibrationCurrent limit establishes forward drive level for test.Injection probe is placed in calibration fixture50 ohm dummy load50 ohm measurement receiver100 ohms totalForward drive required to generated specified current level is recorded at each frequencyDuring test, the lesser ofRecorded drive levelCurrent limit +6 dBis appliedHint: The current limit +6 dB will be reached if the series impedance of the cable and the end circuits is less than 50 ohms.

EMI AnalystThreshold Level and MethodFor CS114, Threshold Method is Closed Loop100 ohm calibration fixture impedancePretest units are dBuV because current limit is in dBuAMargin units are same a Limit units, dBuAMargin is 6 dBFor 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 limitRequirements 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

EMI Analyst

EMI AnalystCabling Configuration8 built-in templates4 shielded, 4 unshieldedInputPhysical dimensionsConductor and dielectric materialsComputesCharacteristic impedanceR, L, C, G valuesHELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/conductors1.htm

EMI Analyst

EMI AnalystCabling ConfigurationShielded Wire Pair Over Ground Plane#18 AWG wiresTwisted, shielded pair5 cm above aluminum ground plane per MIL-STD-461FFabric tape shield. Properties defined on Transfer Impedance form (next)

EMI AnalystConductive Fabric Tape ShieldLaird 86203 Nickel/Copper Black Fabric Tape

EMI AnalystConductive Fabric Tape PropertiesConductive LayerNickel over Copper-plated polyester fabricAdhesive LayerAcrylic, conductive

EMI Analyst

Fabric Resistivity and Adhesive Resistivity

EMI AnalystEnd CircuitsSchematic captureLadder networkPassive components (R, L, C, and magnetically coupled)Left-EndEMI filter for PS circuitRight-EndLISN circuit

HELP: file:///C:/Program%20Files%20(x86)/EMI%20Software/Help/NetHelp/EMI_Analyst_Help.htm#!modules/5/documents/schematic.htm

EMI Analyst

EMI AnalystLeft-End Circuit: EMI Filter

Input Power Filter Schematic

EMI Analyst Filter Schematic

EMI Analyst

EMI AnalystRight-End Circuit: LISN and DC Power Supply

LISN schematic

EMI Analyst LISN schematicand power supply impedance

EMI Analyst

EMI AnalystAnalysis Results ConductorsVoltage and current induced on cable conductors

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EMI AnalystAnalysis Results AnimatedVoltage across cable, 10 kHz to 200 MHzLine-to-Ground (green)Line-to-Line (red)

CS114 Injection Point

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EMI AnalystAnalysis Results 3DRotate Click + dragZoom Ctrl + dragMove Shift + drag

Shown: Voltage, Line-to-Line

EMI Analyst

EMI Analyst

Analysis Results Left EndInduced DM voltage inboard of filtering

V

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

EMI Analyst

EMI AnalystTopic for Next Time?More depth?CS analysis detailsCS01, CS02 setupsOther Threshold methodsShield Transfer ImpedanceBraid, solid, tape, tabular shieldsEMI FiltersIBIS modelsExamplesLVDS, RS422, temp. sensors, other?

Overview of other two apps?CE AnalystRE AnalystCS AnalystRS Analyst

EMI Analyst