MIL-461 EMC CS106 Conducted Susceptibility, Transients, Power Leads
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Summary of EMC CS106 Transient, Power Lead Information
CS106 is applicable to submarine and surface ship equipment. It is also applicable to subsystem AC and DC input power leads.
The equipment under test (EUT) can not show any signs of malfunction or degradation of performance. Moreover, the equipment can not deviate from the specified indications when subjected to a test signal with specified voltage levels. This includes tolerances indicated in the individual equipment or subsystem specification.
Specific testing equipment is used to verify the conducted susceptibility of the EUT to withstand transients coupled onto input power leads.
Data presented within this EMC testing procedure specifies detailed and general information. General information may consist of the date, time, location, and test engineer. Specific information includes:
- Oscilloscope photographs of the calibration waveform.
- Oscilloscope photographs of the injected waveform for each lead.
- Data on any susceptibility thresholds that were determined for each power lead.
- Indications of compliance with the applicable requirements for susceptibility evaluations.
Scope of Unintentional Radiator Conducted Susceptibility Testing
The test equipment used for this EMC testing procedure encompasses a transient generator, capacitor, oscilloscope, resistor, and an isolation transformer.
The test is set up as follows:
- The basic set-up for the EUT is maintained
- Next, the equipment is calibrated. The test equipment is configured. Then, the oscilloscope is set up to monitor the specified voltage across the resistor.
- Following the calibration process, the EUT is tested.
After the setup of the equipment is the procedure. This is conducted by carrying out three main steps.
First, the measuring equipment is turned on and allowed sufficient time for stabilization.
Next, calibration is performed. This is done by setting the transient generator to minimum output, increasing the applied signal of the oscilloscope, and recording the setting of the transient generator.
The EUT is turned on and allowed sufficient time for stabilization. While maintaining the required signal level, the transient pulses are applied. Lastly, the information is recorded.
These steps are repeated for each power lead and test condition as required.
Keystone Compliance Provides Expert MIL-STD 461 Testing
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, 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
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. In addition to conducted susceptibility EMC testing, Keystone has a full scope of expertise including environmental and package testing such as accelerated aging, temperature, and ingress protection.
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