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DO-160 electromagnetic compatibility test project introduction

Release time:

2014-05-27 00:00

Source:

 

       The RTCA DO-160 standard stipulates the environmental conditions and test procedures for aviation airborne equipment, and there are nine chapters in the test items related to EMC .

  • >> Magnetic Field Effect   RTCA DO-160 Sec 15
  • >> Power Input   RTCA DO-160 Sec 16
  • >> Voltage Spike Test   RTCA DO-160 Sec 17
  • >> Power Line Audio Conducted Susceptibility   RTCA DO-160 Sec 18
  • >> Induction signal sensitivity   RTCA DO-160 Sec 19
  • >> RF susceptibility (conducted and radiated)   RTCA DO-160 Sec 20
  • >> Radio frequency energy emission   RTCA DO-160 Sec 21
  • >> Induced Lightning Transient Sensitivity   RTCA DO-160 Sec 22
  • >> Electrostatic discharge test   RTCA DO-160 Sec 25

The EMC- related test items in        the RTCA DO-160 standard are briefly introduced as follows:

  • >> Section 15   Magnetic Field Effects

This test is used to measure the magnitude of DC magnetic field emissions        generated by airborne equipment . Measurements can be made by the degree of deflection of the compass needle, or by using a gauss meter of sufficient accuracy. The classification of the device depends on the distance at which a certain amount of deflection occurs.

  • >> Section 16   Power Input

       This test is used at the power input of airborne equipment to measure various power distortions and surges accompanying the power bus. The classification of equipment is based on the power supply power of the components and the different states defined, such as power supply, there are 115Vac/400Hz , 230Vac/400Hz , 28Vdc , 14Vdc , or 270Vdc multiple types.

  • >> Section 17   Voltage Spikes

This test is to inject a transient spike signal with a pulse width of 10μs and a rise time of less than 2μs        into the power line of the airborne equipment . Applicable to the input terminals of AC and DC power supplies, the magnitude of the transient spike signal has two corresponding levels.

  • >> Section 18   Conducted Audio Susceptibility of Power Lines

       This test is to inject a sine wave interference signal into the power line of the airborne equipment, and is suitable for AC and DC power input terminals. The severity level of interfering signals varies according to the type of power supply of the DUT.

  • >> Section 19   Induction Signal Sensitivity

       This test includes not only magnetic field induction due to power frequency and transient signals, but also electric field coupling. Applicable to airborne equipment and interconnection cables, the test level depends on the degree of anti-interference operation requirements.

  • >> Section 20   RF Susceptibility (Conducted and Radiated)

       The frequency range of conduction susceptibility test is 10kHz ~ 400MHz , which is suitable for interconnection cables and adopts large current injection method ( BCI ).

       The frequency range of the radiated susceptibility test is 100MHz ~ 18GHz , similar to the conduction susceptibility test, the range of severity level is also very wide. For the test with a radiation field strength greater than 200V/m , it can be called a high-energy radio frequency field ( HIRF ) test, and the required field strength can reach thousands of V/m .

  • >> Section 21   Radio Frequency Energy Emissions

       The conducted emission test requires a clamp-type current probe for measurement. For power lines, the test frequency range is 150kHz to 30MHz , and for interconnection cables, the test frequency range is 150kHz to 100MHz .

       The frequency range of the radiated emission test is 2MHz ~ 6GHz , and the standard emission curves are tailored according to different types of communication applications.

  • >> Section 22   Induced Lightning Transient Susceptibility

       This test simulates the transient effect of lightning induction (also known as the indirect effect of lightning). According to the installation position of the airborne equipment on the aircraft, there are different severity requirements. Various waveforms (damped sine wave and Inverse Biexponential), magnitude, and in turn, are tested. This test applies to interconnecting pins and cables of loading equipment.

  • >> Section 25   Electrostatic Discharge

       This test uses the same human body discharge model as IEC/EN61000-4-2 , with a discharge capacitance of 150pF and a discharge resistance of 330Ω . It is required to adopt direct discharge and indirect discharge, and the voltage of positive polarity and negative polarity reaches 15kV .

 

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