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EMC MIL-STD-461 CE106 Conducted Emissions of Antenna Port

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. We tailor each test plan to minimize unnecessary costs and over-testing. Our proven process helps avoid product launch delays by inviting our clients to review draft reports before final certification. Lastly, our strategic partnerships allow us to meet customer needs beyond our scope of accreditation. 

Request a quote to see why we are one of the fastest growing electromagnetic compatibility test labs (EMC) 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 our EMC test lab to achieve their electronic equipment testing needs. 

Summary of EMC Unintentional Radiator CE Antenna Port Information

This MIL-STD 461 CE (conducted emissions) EMC test is applicable from 10 kHz to 40 GHz. This is only applicable to antenna ports of transmitters, receivers, and amplifiers. The MIL-461 test is not relevant to equipment designed with antennas permanently mounted to the equipment under testing (EUT).

For Navy shipboard EMC applications with peak transmitter power greater than 1 kW, the frequency is increased by an additional 0.1% for each dB above 1 kW of peak power.

The electromagnetic compatibility (EMC) equipment is tested to an upper frequency limit based on the highest frequency generated or received by the EUT. For systems with frequencies less than 1 GHz, the upper frequency limit is 20 times the highest frequency or, 18 GHz, whichever is greater.

EMC MIL-STD 461 lab testing data for transmit mode for transmitters and amplifiers is presented as followed:

  • Amplitude versus frequency profiles are continuously and automatically plotted for each tuned frequency.
  • A minimum frequency resolution of 1% or twice the measurement receiver bandwidth is provided.
  • Tabular data showing frequencies of all harmonics and spurious emissions measures is provided. As well as all correction factors including cable loss, attenuator pads, and insertion loss of rejection works.

Data pertaining to EMC electromagnetic compatibility receivers and stand-by mode for transmitters and amplifiers is presented below:

  • Amplitude versus frequency profiles are continuously and automatically plotted for each tuned frequency. Manually gathered data is not acceptable except for plot verification.
  • Applicable limits on each plot are displayed.
  • Like mentioned in the previous bullets, a minimum frequency of 1% or twice the bandwidth is provided.
  • Plots for both measurement and system check portions of the procedure are also provided.

Scope of EMC Conducted Emissions MIL-STD 461 Testing

Conducted emissions at the EUT antenna portal shall not exceed the values given blow:

  • Receivers: 34 dBμV
  • Transmitters and amplifiers (standby mode): 34 dBμV
  • Transmitters and amplifiers (transmit mode): harmonics, not including the second and third are at least 80 dB down from the level at the fundamental. The second and third harmonics are suppressed to a level of -20 dBm or 80 dB below fundamental.

The conducted emissions EMC test procedure is used to verify that conducted emissions appearing at the antenna port of the EUT do not exceed specific requirements.

MIL-STD-461 Standard Procedures for EMC Device Testing

The following test procedure is carried out for transmit modes for transmitters and amplifiers.

First, the equipment is turned on and given enough time to allow a sufficient amount of stabilization. Next the system integrity is checked. This is done by applying a known calibrated signal level from the signal generator. If readings are obtained which deviate by more than 3 dB, the source of the error is located and corrected prior to the next test. Lastly, EUT testing is carried out. This will ultimately determine the measurement path losses at each spurious frequency.

Receivers and stand-by mode transmitters and amplifiers execute a similar electromagnetic compatibility EMC test. However, the calibrated signal level that is applied must be 6 dB below the applicable limit, from the signal generator through the system check path at a midpoint frequency.

Expert EMC, Conducted Emissions and MIL-STD 461 Compliance Testing Labs

Keystone Compliance can accommodate fixed, mobile and portable devices of all sizes. Our team strives to give our customers more time and energy on product development instead of testing. 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