How to perform a MIL-STD-461 CS101, Conducted susceptibility, power leads[edit]
This application note explains how the MIL-STD-461 CS101, Conducted susceptibility, power leads test can be performed with RadiMation®
MIL-STD-461 CS101 is a test method used in military and aerospace environments to assess the conducted susceptibility of equipment to low-frequency interference, 30 Hz - 150 kHz, ensuring it operates reliably in the presence of conducted disturbances.
The exact requirements and test methods for the CS101 are specified in the MIL-STD-461.
Necessary equipment[edit]
The following devices are necessary to run the calibration and EUT test:
- Signal generator
- Amplifier
- Coupler
- Forward power meter (optional)
- Oscilloscope or measurement receiver
- 0.5 Ω resistor
Define the calibration test level[edit]
The CS101 EUT test is limited by the power levels specified in CS101-2, applied through a 0.5 Ω resistor.
During the calibration RadiMation® is levelling on a voltage and the corresponding signal source is recorded which is used during EUT testing to limit on.
To calculate the corresponding voltages based on the power levels the following formula can be used:
This results in the following voltages:
| Frequency |
Power |
Voltage
|
| 30 Hz |
80 Watts |
136 dBµV
|
| 5 kHz |
80 Watts |
136 dBµV
|
| 150 kHz |
0.09 Watts |
106.5 dBµV
|
-
File
- New
- Correction
|
Note:
|
Make sure to add the Vrms column with Columns/Units and remove the Correction column. In addition change the Unit to dBµV.
|
- File
- Save correction
Store the test level as correction file on disk.
Calibration procedure[edit]
The calibration is performed to determine the signal source required for the corresponding power level through the 0.5 Ω resistor, which will be used during EUT testing as limit.
Calibration equipment[edit]
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
|
|
Oscilloscope |
Devices 1 |
Oscilloscope
|
|
Sensor power meter |
Devices 2 |
measurement receiver as power meter (in case no oscilloscope is used)
|
Configure the calibration[edit]
The configuration of the calibration can be created by selecting the menu:
- Calibration
- System calibration
- Conducted susceptibility
 Start
|
The start frequency of the calibration. 30 Hz.
|
| End
|
The stop frequency of the calibration. 150 kHz.
|
| Step
|
The frequency step, 5%.
|
| Test level
|
The test level, in this case Voltage.
|
| Variable
|
The variable test level, select the correction file created before 'CS101-2 power limit.cor'.
|
| Tolerance
|
The regulation tolerance.
|
| Calibration method
|
The power measurement that should be the result of the calibration: Signal generator level
|
| Test equipment
|
Calibration test equipment.
|
| Test engineer
|
The engineer that performed the calibration.
|
Calibration result[edit]
When the calibration is finished, the engineer is asked to save the results of that calibration to a calibration (.CAL) file. It is possible to give the .CAL file a clear and distinct name.
EUT Testing[edit]
EUT Testing equipment[edit]
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
|
|
Oscilloscope |
Devices 1 |
The oscilloscope to measure the voltage
|
|
Sensor powermeter |
Devices 2 |
When a measurement receiver is used to measure voltage
|
Configure the EUT test[edit]
To perform the actual test on the EUT, create a conducted immunity multiband test.
The conducted immunity multiband test configuration is created by selecting 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 150 kHz.
|
| Frequency Step
|
The frequency step, see Table III.
|
| Dwell Time
|
The dwell time specified see TABLE II of the MIL-STD-461.
|
| Frequency Change Mode
|
The method that is used to change from one to the next frequency: Constant.
|
| Modulation
|
Modulation is not required.
|
| Test equipment
|
The equipment needed for the conducted susceptibility test.
|
| Location Type
|
Injection clamp.
|
| Test Level
|
Specify the Current voltage closed loop method test level and add a Calibrated voltage limit limit
|
| Inputs
|
No inputs are needed.
|
At Test Level click Add to add a new Test level and select Test Level - Voltage closed loop method
| Description
|
The description of the test level.
|
| Calibration file
|
Select the calibration file to use for this band.
|
| Test level
|
Variable current, and specify the correction file for the applicable test level.
|
| Calibration method
|
Select Forward Power.
|
| Tolerance
|
Specify the tolerance to use.
|
Next to the test level add a limit, At TestLevel click Add to add a new Limit and select Limit - Calibrated voltage limit
With this limit the level will not be regulated higher than the measured current in the cable even if the forward power is not reached yet.
| Description
|
The description of the limit
|
| Constant current
|
The current to limit on.
|
When all bands are configured press Start Test to run the EUT test.
EUT Test Result[edit]
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[edit]
The MIL-STD-461G CS114 calibration can be performed by using the Conducted immunity calibration.
The RadiMation® Conducted immunity multiband test can then be used to perform the MIL-STD-461G CS114 verification and the EUT test with a calibration file and the current sensor used as a limit in the EUT test.
