RadiMation Application Note 155

How to perform a MIL-STD-461 CS109, Conducted susceptibility, structure current test

This application note explains how the MIL-STD-461 CS109, Conducted susceptibility, structure current test can be performed with RadiMation^®

The exact requirements and test methods for the CS109 are specified in the MIL-STD-461.

Necessary equipment

The following devices are necessary to perform the CS109 test:

• Signal generator
• Amplifier
• Coupling Transformer
• Current sensor
• Cable drivers with corrections
• Sensor power meter / Analyser
• 0.5 Ohm resistor
• Isolation Transformer

Tips

Note: If the current unit is shown as uA, it can be changed to dBuA by clicking Units, select Current and click Edit to change this.

Define the test level

Create a correction file for the test level

    File

       New

          Correction

First create a correction file in RadiMation^® and specify the test level (See 'FIGURE CS109-1. CS109 limit.').

Ensure that the correction file has a Frequency column and a Current column with the unit set to dBuA.

    File

       Save correction

Store the test level as correction file on disk.

This correction file with the test level will be used during EUT testing.

EUT Testing

EUT Testing equipment

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
	Sensor powermeter	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 device to use
Cables
①	Cable current -> power meter	Cables	Cable (1) with a correction file specified for the cable loss

Configure the EUT test

To perform the test on the EUT, create a conducted immunity multiband test. The conducted immunity multiband test, can be started by selecting from the menu:

    Tests

       Conducted Immunity

          Multiband

Start

The start frequency of the test. For example 30 Hz.

End	The stop frequency of the test. For example 100 kHz.

Frequency Step

The frequency step, see Table III.

Dwell Time

The dwell time.

Frequency Change Mode

Constant.

Modulation

CS109 does not specify a modulation to use.

Test equipment

The equipment needed for the conducted immunity test.

Location Type

Injection clamp.

Test Level

Specify the current substitution method. Also add a "Measured Current Limit"

Inputs

No inputs are needed.

At TestLevel click Add to add a new Test level and select TestLevel - Current closed loop method

Description

The description of the test level.

Test level

Variable current, and specify the correction file for the applicable test level.

Tolerance

Specify the tolerance to use.

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

EUT Test Result

Once the test is finished, the results of this test are stored in the EUT file and available as one of the performed Tests in the EUT file. Selecting the corresponding test result and pressing on Info will show the test results again.

Conclusion

The RadiMation^® Conducted Immunity multiband test can be used to perform the CS109 test with a current closed loop method test level and a variable test level specified in a correction file.