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MIL-STD-461 CS118 Conducted Susceptibility EMC Testing

As a leader in EMC regulatory compliance testing, Keystone Compliance assists electronic equipment manufacturers with MIL-STD 461 EMC testing. Meeting the IEC, EN, and other MIL-STD-461 testing requirements can be challenging. Not only do we understand the challenges, but we help guide companies through the process.

Keystone’s EMC testing engineers streamline the process and assist companies to achieve the compliance they require. Keystone Compliance’s accurate test reports are delivered quickly using our “four-eyes” approach. Meaning that multiple engineers and technicians review each report, ensuring that all the information required is present. Additionally, we are in constant communication throughout the entire test process. We tailor each test plan to individual customer needs minimizing unnecessary costs and over-testing.

Request a quote to receive expert MIL-STD-461 testing services tailored to your specific needs. Contact us to discuss your product and how we can assist you in achieving electromagnetic compatibility lab testing certifications.

Summary of MIL STD-461G Test Method CS118 Personnel Borne Electrostatic Discharge

This MIL-STD 461 compliance testing method is applicable to electrical, electronic, and electromechanical subsystems and equipment that have a man-machine interference. The MIL-461 CS118 test is not applicable to ordnance items.

This immunity test procedure is used to verify the ability of the EUT to withstand personnel-borne electrostatic discharge (ESD) in a powered-up configuration.

Scope of MIL-STD-461 Standard CS118 Conducted Susceptibility Testing

The equipment under testing (EUT) cannot show any signs of malfunctioning or degradation of performance. The EUT must not show signs of deviation from specified indications when subjected to values while discharging from a 150 picofarad capacitor. This includes beyond the tolerances indicated in the individual equipment or subsystem specifications.

Contact discharge at 8 kV is required for conductive surfaces. Air discharge is only required where contact discharge cannot be applied.

Unintentional Radiator CS118 Conducted Susceptibility Testing Procedures

The test is set up specifically as follows:

  • The electrostatic discharges are applied to points and surfaces of the EUT which are accessible to the operator during normal use.
  • Test points to be considered include any conductive or non-conductive points in the control or keyboard area, and any other point of human contact such as switches, knobs, buttons, connector shells, and other accessible areas. As a minimum, each face is included.
  • The calibration procedures are crucial to the EUT. First, the ESD network and air discharge tip are installed onto the ESD generator. Next, the measurement is left for stabilization. Lastly, the ESD generator is verified.

The test procedures are carried out as follows:

  • The ESD Generator is ground to the EUT chassis ground point in the setup.
  • The EUT is powered and operated during this test in a manner sufficient to verify its operation.
    • The ESD generator’s tip voltage is set to the selected test level.
    • Five positive discharges and five negative discharges are applied to each EUT test point.
    • The discharges are applied directly on the test point. For air discharges, the tip starts at a distance and is moved closer to the EUT slowly until the discharge occurs or until the tip physically contacts the test point.
  • The EUT is monitored for degradation of performance during testing,
  • Lastly, the MIL 461-test is repeated for each applicable level of voltage.

Keystone Compliance Offers Expert MIL-STD 461 EMC Compliance Lab Testing

Keystone Compliance can accommodate fixed, mobile and portable devices of all sizes. In addition to EMC CS118 laboratory testing, Keystone has a full scope of expertise including environmental and package testing such as vibration, ingress protection, and cold chain. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling.

Request a quote to find out for yourself about the Keystone difference. For more information on why so many companies partner with Keystone Compliance, contact us.

For more information on general MIL-461 compliance and test standards, please visit the links below: