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MIL-461 EMC Conducted Susceptibility of Undesired Signals

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 MIL-STD 461 test engineers work with clients to quickly develop appropriate and concise test plans. Additionally, we are in constant communication throughout the entire test process. Keystone takes pride in providing the peace of mind that all of your MIL-STD-461 testing needs will be met. Our proven process helps avoid product launch delays by inviting our clients to review draft reports before final certification.  

Request a quote to see why we are one of the fastest growing 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 MIL-STD 416 Compliance Testing of Conducted Susceptibility

This EMC conducted susceptibility/immunity test is useful for equipment ranging from 30 Hz to 20 GHz. This includes equipment such as communication receivers, amplifiers, transceivers, radar receivers and electronic warfare receivers.

For Navy ships and submarines, this EMC immunity requirement is applicable to all receivers. The applicable frequencies are a function of the front-end design of the unit being assessed.

The equipment under testing (EUT) must not exhibit any undesired responses. These responses cannot be beyond specific tolerances when subjected to the limit requirement. The limit requirement is provided in this individual MIL-STD 461 lab specification.

This electromagnetic compatibility (EMC) procedure is used to determine the presence of spurious responses. These responses may be caused by undesired signals at the EUT antenna input ports.

Lastly, the required EMC test equipment, setup, procedures, and data presentation must be determined. These factors are decided on a case-by-case basis in accordance with the guidance provided in the CS104 MIL-STD 461-test.

Scope of the Conducted Susceptibility EMC Compliance MIL-461 Standard

CS104, conducted susceptibility, antenna port and rejection of undesired signal testing is applicable from 30 Hz to 20 GHz. The EMC immunity test is stated for equipment such as subsystems. 

The intent of this MIL-461 testing requirement is to control the response of antenna-connected. This is done by receiving subsystems to signals outside of the intentional passband of the subsystem. This EMC MIL-STD 461 compliance condition can be applied to receivers, transceivers, amplifiers and other similar products.

Due to the wide diversity of subsystem designs being developed, the relevance of this type of requirement and fitting limits need to be considered for each military test.

There are multiple approaches for determining levels required for this conducted susceptibility test. One is determined from an analysis of electromagnetic environments present and characteristics of receiving antennas. However, levels calculated by this means will often place biased design penalties on the receiver. Another option is to simply specify levels that are within the state-of-the-art for the particular receiver design.

MIL-STD 461 Testing of Unintentional Radiator EMC Procedures

There are a large variety of EMC receiver designs being developed. Because of this, the requirements for the practical characteristics of a receiver are established before valid test procedures can be developed. Only general testing techniques are discussed within this military testing EMC CS conducted susceptibility/immunity test.

Front-end rejection testing is applied to a variety of receiving subsystems such as receivers, RF amplifiers, transceivers, and transponders.

Several receiver front-end characteristics must be known before testing. These characteristics are generally determined by the EMC device test. The bandpass characteristics of the receiver are important. These will help determine frequencies near the receiver fundamental that will be excluded from the EMC electromagnetic compatibility test.

The provisions for this test are often expressed in terms of a relative degree of rejection by specifying the difference in level between a potentially interfering signal and the established sensitivity of the receiver under test. Therefore, determination of the sensitivity of the receiver is a key portion of the EMC conducted susceptibility test.

Expert MIL-STD-461 Standard EMC Compliance Services and Susceptibility Testing

Keystone Compliance can accommodate fixed, mobile and portable devices of all sizes. In addition to EMC MIL-STD 461 compliance testing, Keystone has a full scope of expertise including environmental and package testing such as accelerated aging, temperature, and cold chain. Our team strives to give our customers more time and energy on product development instead of testing.  

Request a quote to find out for yourself about the Keystone difference. Have a question about CS104 or military standard testing? Contact us or call (724) 657-9940 and we will determine the best course of action.