METHOD OF ASSESSMENT ELECTROMAGNETIC COMPATIBILITY avionics AS PART OF AIRCRAFT in the frequency range from 10 kHz to 400 MHz

摘要

Method for evaluating electromagnetic compatibility (EMC) onboard equipment as part of the aircraft in the frequency range from 10 kHz to 400 MHz, including extreme values ​​of the range comprising series connection transmitters avionics on emission, acting through the onboard transmitter antennas radio interference on the test board equipment (BO ) BO performance evaluation before and after the interference on board, characterized in that it further after the power for opomeh successively measured induced currents interference I pom in each circuit of the test equipment., which inductive measuring current sensor is disposed at a distance of five centimeters from the inlet connector to the electrical circuit of the test aircraft equipment, connected via a high frequency cable with a spectrum analyzer, which measures the interference voltage level and taking into account the transient current transducer impedance Z evaluate the level of the induced current in the electrical circuit by the formula: = Ipom Upom.-Z, gdeIpom.. - interference level of the induced current in the electrical circuit, expressed in dB mA Ipom. [DB mA] = 201g Ipom. [MA] Upom. - a spectrum analyzer measured interference level voltage, expressed in dB ohms Upom. [MV dB] = 201g Upom. [MV]; Z - transient current sensor impedance in dB ohms, Z [dB OM] = 201g Z [OM]; Ipom compared. at the operating frequency source interference with the maximum permissible current Imax., Imax. [DB mA] = 201g Imax. [MA]. appropriate test level on the susceptibility to interference of conductivity depending on the given category of the test BO to be installed on the aircraft, the category of