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MIL-461 RE101 EMC Radiated Emissions Magnetic Field 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.

From concept through compliance, Keystone meets all of our customer needs under one roof. Our MIL-STD-461 test engineers work with clients to quickly develop appropriate and concise test plans. We tailor each test plan to individual customer needs minimizing unnecessary costs and over-testing.

Request a quote to see why we are one of the fastest growing radiated emissions testing laboratories and MIL-STD-461 testing labs in the country. Ready to get started? We are. Contact us to see why so many companies work with us to achieve their EMC testing needs. 

Summary of RE101 Unintentional Radiator EMC Compliance Testing

The MIL STD-461 EMC radiated emissions test method is applicable from 30 Hz to 100 kHz for radiated emissions from equipment and subsystem enclosures. This includes electrical cable interferences. The MIL-461 standard test requirement does not apply to radiation from antennas.

For Navy aircraft, RE electromagnetic compatibility testing is applicable only with anti-submarine warfare (ASW) equipment which operates between 30 Hz and 10 kHz. Such as: Acoustic receivers or magnetic anomaly detectors.

MIL-STD 461 compliance testing procedureRE101 is used to verify that the magnetic field emissions from the equipment under testing (EUT) and its associated electrical interferences do not exceed specified requirements.

Graphs of scans and tabular listings of each measurement frequency, mode of operation, measured magnetic field, and magnetic field limit levels are provided.

MIL-STD-461 Standard Electromagnetic Compatibility Testing Procedures

Magnetic field emissions can not be radiated in excess levels at a distance of 7 cm.

  • The measurement equipment is turned on and allows sufficient time for stabilization.
  • Measurement system integrity check.
    • A calibrated signal level is applied. The level must be at least 6 dB below the limit (limit minus the loop sensor correction factor), at a frequency of 50 kHz. Then, the measurement receiver is tuned to a center frequency of 50 kH.
    • The measurement receiver indicates a level within ±3 dB of the injected signal level.
    • If readings are obtained which deviate by more than ±3 dB, the source of the error must be corrected prior to proceeding with the testing.
    • Using an ohmmeter, the resistance of the loop sensor winding is approximately 10 ohms is verified.
  • EUT testing.
    • The EUT is turned on and allows sufficient time for stabilization.
    • The loop sensor must be 7 cm from the EUT face or electrical interface connector being probed. The plane of the loop sensor is oriented parallel to the EUT faces and parallel to the axis of connectors.
    • The measurement receiver is scanned over the applicable frequency range to locate the frequencies of maximum radiation. This is done using specified bandwidths and minimum measurement times.
    • The measurement receiver is tuned to one of the frequencies or bands of frequencies.
    • The output is monitored by the measurement receiver while moving the loop sensor over the face of the EUT or around the connector.
    • At 7 cm from the point of maximum radiation, the plane of the loop sensor is oriented to give a maximum reading on the measurement receiver.
    • These steps are repeated for at least two frequencies of maximum radiation per octave of frequencies below 200 Hz and for at least three frequencies of maximum radiation per octave above 200 Hz and for each EUT electrical connector.

Expert MIL-461 Standard Unintentional Radiator EMC Compliance Testing

Keystone Compliance can accommodate fixed, mobile and portable devices of all sizes. In addition to EMC RE101 laboratory testing, Keystone has a full scope of expertise including environmental and package testing such as vibration, ingress protection, and cold chain. We have 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