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EMC MIL-STD-461 CS101 Conducted Susceptibility 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 Compliance’s proven process helps avoid product launch delays by inviting our clients to review draft reports before final certification. Our MIL-STD-461 test engineers work with clients to quickly develop appropriate and concise test plans. Strategic partnerships allow us to meet customer needs beyond our scope of accreditation. 

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 EMC compliance certifications.

Summary of Electromagnetic Compatibility (EMC) Conducted Susceptibility CS101 Testing

EMC CS101 conducted susceptibility/immunity testing is used to verify the ability of the EUT to withstand signals coupled onto input power leads. This EMC requirement is applicable from 30 Hz to 150 kHz. The frequency range is relevant to equipment and subsystem AC, limited to current draws less than or equal to 30 amperes per phase, and DC input power leads.

If the equipment under testing (EUT) is DC operated, this EMC requirement is applicable over the frequency range of 30 Hz to 150 kHz. If the equipment is AC operated, it is applicable to frequencies extending 150 kHz.

Scope of MIL-STD-461 Immunity Test Method CS101

It is important to note that the EMC equipment must not exhibit any malfunction, degradation of performance, or deviation from specified indications.

The EMC device testing data that will be presented is as follows:

  • A graphical or tabular representation showing the frequencies and amplitudes at which the EMC military test was conducted for each lead.
  • Data of any susceptibility thresholds and the associated frequencies that were determined for each power lead.
  • Indication of EMC compliance with the applicable requirements for the susceptibility evaluation.

MIL-461 Standard Unintentional Radiator EMC Testing Procedure

There are two EMC methods provided for making measurements of the applied signal. The first uses an oscilloscope with a power input isolation transformer. The second MIL-461 test method uses a measurement receiver together with a transducer. The transducer electrically isolates the receiver from the EUT power. Then, it reduces the levels to protect the receiver.

The electromagnetic compatibility (EMC) test procedures are carried out below:

  • The measurement equipment is turned on and allowed sufficient time for stabilization.
  • Next, calibration. The signal generator is set to the lowest frequency.
  • The equipment under testing is then turned on and given time to stabilize. While maintaining the least required signal level, the frequency range is scanned and a susceptibility evaluation is performed.
  • These steps are repeated for each power lead as required.

Keystone Compliance Offers Expert EMC Compliance Services

In addition to EMC conducted susceptibility testing, Keystone has a full scope of expertise including environmental and package testing such as accelerated aging, cold chain, and ingress protection. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. Our team strives to give our customers more time and energy on product development instead of testing.

If you are ready to start your electromagnetic compatibility (EMC) and MIL-STD 461 compliance testing, please request a quote. For more information on why so many companies partner with Keystone Compliance’s EMC test lab, contact us