RadiMation Application Note 154

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How to perform a MIL-STD CS114, Conducted susceptibility, bulk cable injection test

This application note explains how the MIL-STD CS114, Conducted susceptibility, bulk cable injection test can be performed with RadiMation®

The exact requirements and test methods for the CS114 are specified in the MIL-STD-461.

Necessary equipment

The following devices are necessary to run this test:

  • Signal generator
  • Amplifier
  • Coupler
  • Forward power meter
  • Reflected power meter (optionally)
  • Current sensor
  • Sensor power meter / Analyser
  • 50 Ohm load
  • 50 Ohm attenuator
  • LISN
  • Current injection device
  • Current injection calibration jig (Calibration fixture)
  • Cable drivers with corrections

Configuration of the test sites

Calibration

CS114 Calibration.png

The configuration of the calibration test site should contain the following devices:

Device name Tab in testsite configuration window note
Signal generator Devices 1 The signal generator to use
Amplifier Devices 1 The amplifier to use
Coupler Devices 1 The coupler to use
Forward power meter Devices 1 The forward power meter to use
Reflected power meter Devices 1 The reflected power meter to use (optionally)
Sensor power meter Devices 2 The power meter or analyser to use for measuring the current
Current sensor Devices 2 The current sensor to use with transfer factor attached to the driver
Injection device Devices 2 The injection clamp to use
Jig Devices 2 The jig to use
Cable current -> power meter Cables Cable (1) with a correction file specified for the cable loss
Cable current -> power meter Cables Cable (2) with the specified loss of the used attenuator
Cable current -> power meter Cables Cable (3) with a correction file specified for the cable loss

Verification

CS114 Verification.png

The configuration of the verification test site should contain the following devices:

Device name Tab in testsite configuration window note
Signal generator Devices 1 The signal generator to use
Amplifier Devices 1 The amplifier to use
Coupler Devices 1 The coupler to use
Forward power meter Devices 1 The forward power meter to use
Reflected power meter Devices 1 The reflected power meter to use (optionally)
Sensor power meter Devices 2 The power meter or analyser to use for measuring the current
Current sensor Devices 2 The current sensor to use with transfer factor attached to the driver
Injection device Devices 2 The injection clamp to use
Cable current -> power meter Cables Cable (1) with a correction file specified for the cable loss
Cable current -> power meter Cables Cable (2) with the specified loss of the used attenuator
Cable current -> power meter Cables Cable (3) with a correction file specified for the cable loss

EUT Testing

CS114 EUT Testing.png

The configuration of the eut test site should contain the following devices:

Device name Tab in testsite configuration window note
Signal generator Devices 1 The signal generator to use
Amplifier Devices 1 The amplifier to use
Coupler Devices 1 The coupler to use
Forward power meter Devices 1 The forward power meter to use
Reflected power meter Devices 1 The reflected power meter to use (optionally)
Sensor power meter Devices 2 The power meter or analyser to use for measuring the current
Current sensor Devices 2 The current sensor to use with transfer factor attached to the driver
Injection device Devices 2 The injection clamp to use
Cable current -> power meter Cables Cable (1) with a correction file specified for the cable loss
Cable current -> power meter Cables Cable (2) with the specified loss of the used attenuator
Cable current -> power meter Cables Cable (3) with a correction file specified for the cable loss

Calibration procedure

Create a correction file for the test level

   Menu.png File
      Menu.png New
         Menu.png Correction

First create a correction file in RadiMation® and specify the applicable test level (See 'TABLE IV CS114 limit curves.' and 'FIGURE CS114-1. CS114 calibration limits.'). In this example the limits for 'Aircraft (External or safety critcal) / Curve 5 are configured.

Make sure to remove the Correction column and add the Current column with the unit set to dBuV.

CS114 Test level.png

Create calibration test setup files

There are three frequency ranges that have to be calibrated with the following settings (see TABLE III).

Band Frequency range Step size
Band 1 10 kHz - 1 MHz 5 %
Band 2 1 MHz - 30 MHz 1 %
Band 2 30 MHz - 200 MHz 0.5 %
   Menu.png Calibration
      Menu.png System calibration
         Menu.png Conducted immunity

Create three test setup files, this example shows the settings for band 1.

CS114 Calibration band 1.png


ScreenElementDescription.png Start The start frequency of the test. For example 10 kHz.
ScreenElementDescription.png End The stop frequency of the test. For example 1 MHz.
ScreenElementDescription.png Step The frequency step, in this case 5%.
ScreenElementDescription.png Test level The test level, in this case current.
ScreenElementDescription.png Variable The variable test level, select the correction file created earlier.
ScreenElementDescription.png Tolerance The regulation tolerance.
ScreenElementDescription.png Calibration method Forward power.
ScreenElementDescription.png Test equipment Calibration test equipment.
ScreenElementDescription.png Test engineer The engineer that performed the calibration.


Calibration result

When the three calibrations are performed there should be three calibration files created.

Verification

Create the Test Setup File (TSF)

CS114 requires to perform a verification of the setup with the probes in the calibration setup. With this verification it is important to verify that the forward power of the calibration is followed and that the developed current is within 3 dB tolerance of the current test limit.

   Menu.png Tests
      Menu.png Conducted Immunity
         Menu.png Multiband

Create a new multi band conducted immunity test and define three bands with the following settings:

Band Frequency range Step size
Band 1 10 kHz - 1 MHz 10 %
Band 2 1 MHz - 30 MHz 2 %
Band 2 30 MHz - 200 MHz 1 %

Each band needs a test level defined with the test level "Current substitution method" and the appropriate calibration file attached. Make sure to select the same "Power Method" as done during the calibration, in this case "Forward Power". CS114 Current Testlevel Configuration.png

Next to the test level add an input "Current sensor", this will ensure that the current is measured during the test.

CS114 Verification Setup.png


ScreenElementDescription.png Start The start frequency of the test. For example 10 kHz.
ScreenElementDescription.png End The stop frequency of the test. For example 1 MHz.
ScreenElementDescription.png Frequency Step The frequency step, see 5.12.3.4.c.3.
ScreenElementDescription.png Dwell Time The dwell time specified see TABLE II.
ScreenElementDescription.png Frequency Change Mode Constant.
ScreenElementDescription.png Modulation Modulation is optional during the verification.
ScreenElementDescription.png Test equipment The equipment needed for the verification.
ScreenElementDescription.png Location Type Injection clamp.
ScreenElementDescription.png Test Level Specify the current substitution method.
ScreenElementDescription.png Inputs Add the current sensor as an input.


Run the verification test

When all settings are configured press Start Test to run the verification test.

CS114 Verification Result.png

Verification result

With the result of the verification it should be possible to determine if the measured current is within the 3 dB tolerance of the current test limit as specified in 5.12.3.4.c

EUT Testing

Conclusion

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