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MIL-STD-461 CS103 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 Compliance tailors each test plan to individual customer needs minimizing unnecessary costs and over-testing. Keystone takes pride in providing the peace of mind that all of your MIL-STD-461 testing needs will be met. 

Request a quote to see why we are one of the fastest growing EMC and MIL-STD-461 testing labs in the country. Contact us to discuss your product and how we can assist you in achieving EMC device testing and CS conducted susceptibility certifications.

Summary of EMC MIL-STD-461 Testing of Antenna Ports

This EMC receiver front-end susceptibility/immunity test method is applicable from 15 kHz to 10 GHz for equipment and subsystems. These may include communication receivers, amplifiers, transceivers, and electronic warfare receivers. The EUT must not exhibit any intermodulation products beyond specified tolerances. This is only when subjected to the limit requirement provided in this specification.

The electromagnetic compatibility (EMC) test procedure is used to determine the presence of intermodulation products that may be caused by undesired signals at the EUT antenna input ports.

The required EMC test equipment, setup, procedures and data presentation is determined on a case-by-case basis in accordance with the guidance provided in this military standard test.

Scope of CE Conducted Susceptibility/Immunity Unintentional Radiator Testing

The CS103 requirement is applicable from 15 kHz to 10 GHz for equipment and subsystems such as communication receivers, acoustic and other receivers. The intent of this MIL-STD-461 test method CS103 is to control the response of antenna-connected receiving systems. Due to the wide diversity of subsystems, the limits are determined individually for each test.

One approach for determining specific levels for the out-of-band signals is from an analysis of the electromagnetic environments and characteristics of receiving antennas. However, these levels may often place unreasonable design penalties on the receiver. An alternative approach is to specify the levels that are within the state-of-the-art for the particular receiver design.

Lastly, for other types of receivers, the application of this EMC compliance test is often less straightforward. Care is taken to ensure that any applied requirements are strictly and properly specified. Many receivers are designed to be interference or jam-resistant. This feature may make the application of this requirement difficult or inappropriate.

MIL-STD 461 Compliance and EMC Conducted Susceptibility CS103 Testing Procedures

Because of the large variety of receiver designs being developed, the requirements for the specific operational characteristics of a receiver are established before the test procedures can be developed. Several receiver front-end characteristics must be known for proper testing. These characteristics are generally determined by the specific EMC and MIL-STD 461 test.

The maximum signal input that the receiver can tolerate without overload needs to be known. This will ensure that the test levels are reasonable. These signals must also be known so that the test truly evaluates intermodulation effects.

Requirements for this EMC immunity test are generally expressed in terms of a relative degree of rejection. This is done by specifying the difference in level between potentially interfering signals and the established sensitivity of the receiver under test. Therefore, the determination of the sensitivity of the receiver is a key portion of the test. 

The basic EMC concept with the MIL 461 method CS103 test is to combine two out-of-band signals. Then, apply them to the antenna port of the receiver while monitoring the receiver for an unwanted response.

One of the out-of-band signals is normally modulated with the modulation expected by the receiver. The second signal is normally a continuous wave.

Keystone Compliance Offers Expert EMC Compliance Services and MIL-461 Testing

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

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