MIL-461 EMC CS117 Conducted Susceptibility Compliance 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.
Strategic partnerships allow us to meet customer needs beyond our scope of accreditation. We tailor each test plan to individual customer needs minimizing unnecessary costs and over-testing. Keystone’s radio testing engineers streamline the process and assist companies to achieve the compliance they require. We have a reputation of helping customers achieve their MIL-STD-461 product certifications.
Summary of MIL-STD-461 Standard CS EMC Lightning Induced Transient Testing
This CS conducted susceptibility/immunity testing requirement applies to all safety-critical equipment interconnecting cables. Furthermore, this includes complete power cables, and individual high side power leads. The MIL-STD 461 compliance test is also applicable to non-safety critical equipment with interconnecting cables/electrical interferences that are part of or connected to equipment performing safety critical functions.
The MIL STD-461 standard test method has limited relevance to surface ship equipment which have cables routed above deck.
Lastly, the MIL-STD-461G CS117 conducted susceptibility test is specifically designed to verify the ability of the EUT to withstand lightning transients coupled onto EUT associated cables and power leads.
Scope of Unintentional Radiator Military 461 Compliance Testing
The EMC equipment under testing (EUT) can not exhibit any malfunctions or degradation of performance. The EMC electromagnetic compatibility device must also not deviate from the specified indications when subjected to levels of lightning transients. This includes beyond the tolerances indicated in the individual equipment or subsystems specification.
In the event that there is platform lightning transient data available, the data is used to tailor requirements with different selected levels or waveforms. The power lines are tested separately as well as within the bundle defined in the test procedures section.
The applicable transients are considered default values and waveforms based on previous experience. The transients are used for the defined equipment functionality when the host platform lightning transient data does not exist.
Below is a list of general and specific data information that is included in the military standard test report:
- A list of waveforms and amplitudes at which the test was conducted for each cable lead.
- Graphical representation of calibration waveforms.
- Graphical representation of test waveforms for each cable and lead tested; one sample for each polarity.
- Data on any susceptibility thresholds and the associated waveforms that were determined for each connector and power lead.
- Probe correction factors and attenuator data on the data plots if not automatically applied to the displayed waveforms.
- Indication of compliance with the requirements for the susceptibility evaluation for each connector.
MIL-STD 461G CS117 Unintentional Radiator Compliance Testing Procedures
The MIL-STD lab test procedure starts off with the measurement of equipment.
- The equipment must be allowed sufficient time for stabilization.
- Next, the equipment must be calibrated. This is done by connecting the transient generator to the primary input of the injection transformer. For multiple stroke and burts tests, the appropriate pulse patterns and timing must be verified in accordance with this military testing standard.
- The equipment under testing (EUT) is measured. This is done by turning on the EUT and allowing sufficient time for stabilization. Next, the transients are applied and the generator setting is increased until the designated test level or limit is reached.
- The test is acceptable for two main reasons. If the transient generator produced a compliant limit during calibration, and if the specified waveform limit is achieved. This step is repeated on each cable bundle interfacing with each electrical connector on the EUT.
Keystone Compliance Offers Expert EMC Unintentional Radiator Compliance Services
In addition to EMC conducted emissions and susceptibility lab testing, Keystone has a full scope of expertise including environmental and package testing such as vibration, accelerated aging, 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 lab and MIL-STD-461 testing, please request a quote. For more information on why so many companies partner with Keystone Compliance, contact us.