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Dołączył: 13 Gru 2010
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 Wysłany: Czw 11:32, 06 Sty 2011 Temat postu: Comprehensive Test all machine electronic shieldin |
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,[link widoczny dla zalogowanych]
Comprehensive Test all machine electronic shielding chamber
15mm. Absorbing properties: 3OMHz ~ 1GHz for a 15dB ~ 35dB,[link widoczny dla zalogowanych], while the cone angle at high frequencies (1GHz or more) up to a 40dB --- absorbing properties of a 50dB. 'If the ferrite plate and 30cm by 10mm cone absorbing combination of methods,[link widoczny dla zalogowanych], absorbing performance (reflecting the quiet zone level) can be achieved: 30MHz-' ~ 500MHz: 15dB ~ one of a 35dB. 500MHz ~ 40GHz: a 35dB - ~ a 50dB. ② rate of uniformity: the quiet zone axis: + / for a 2dB for a 25 - 4 CAC Technology 2002 Comprehensive Tests of full electronic shielding machines Fan Fuming chamber horizontal quiet zone: + / for a cross-polarization 0.25dB ③: < multi-path loss of a 25dB ④: + / Performance requirements for a 0.25dB4.3.3 turntable widely used as shielding chamber, rotary table in a dark room under the floor configuration is essential. Turntable installed in the chamber central axis position, the door from the chamber 12 to 13 meters, to take into account the requirements of the test (antenna, RCS, radar, electronic warfare, civilian EMC, etc.). Requirements of 6 meters in diameter turntable, bearing 2O tons, three-dimensional motion, angle precision 0.1 degrees, automatic process control. Turntable set basement ventilation duct, a dark room with toxic gas pump, from moisture. Speed of 1 rev / min 5 rev / min continuously adjustable, both forward and can also be reversed. 4.3.4 fire safety measures ① smoke alarm: a dark room absorbing cone flammable, toxic gases when burned. To ensure the safety of the aircraft and darkroom, dark room must configure the appropriate number of smoke sensors, sensor signal lines and power lines must be converted by the optical system or signal filter device is connected with the anti-police, to prevent outside interference in series inductor chamber. ② extinguishing systems: carbon dioxide fire extinguishing agent, when no automatic fire suppression, fire was used manually to prevent accidental firing of staff injuries. ⑧ safety relief Skylight: shielding chamber must be set on top of a small area of not less than the top of the window screen door of the smoke. In case of fire, automatic alarm control signal to automatically pop open, on the one hand from the smoke effect, on the other hand a dark room from the balance, the role of outside pressure difference, to prevent the deformation of shield chamber. 4.3.5 Other technical requirements shielded chamber ① Power supply: three-phase 400Hz, 115V power supply, DC 27V power supply, three-phase 50Hz, 380V power supply, single phase 50Hz, 220V power supply ② Power Filter: Any power must be a dark room The power supply filter into, in order to filter out the stray power line interference. Filter insertion loss requirements: 14KHz ~ 10GHz frequency range, insertion loss ≥ 100dB. ③ a 26 for a hydraulic power source: the collection for the aircraft landing gear, flight control system up and rudder movement, to be equipped with dual hydraulic dark outside sources, and interfaces into the chamber through the pipe, hydraulic pressure source interface to be handled by the anti-electromagnetic leakage. ④ Air Source: Aircraft environmental control must be dark outside cooling source to provide air-conditioning, the pipeline must be anti-electromagnetic leakage treatment. ⑤ ventilation system: To keep indoor air fresh and dark, from moisture and toxic gases, and the exclusion of all aircraft systems and equipment work of the heat generated by the ventilation system must be set. Return air must honeycomb waveguide, waveguide port is necessary to meet delivery, return air volume requirements, but also meet the following 40GHz frequency electromagnetic shielding requirements. ⑥ lighting system: using non-interference, anti-halogen lamps. Lighting a dark room layout must ensure that all parts of the uniform brightness, and the light over there must be ventilation. ⑦ intercom system: To ensure the test room, dark room and aircraft operators and regular contact between the coordination, intercom systems should be set for the completion of flight testing room 4.3.6 All test tasks, you must configure a set of electromagnetic receiving system interference, electromagnetic interference emission system, turntable control system, camera video surveillance system, monitoring system DUT test equipment and other support. Test system and tested in order to avoid mutual interference between systems, test systems and test equipment and monitoring equipment must be placed in a small screening room. Therefore, the longitudinal axis of the large screen end of the first chamber to be built three 5-meter-long, 4 meters wide and 3.5 meters high small shielded room. Respectively, the receiving system, launch system and monitoring system. All power supply and lighting power required to access through the filter. 4.3.7 shielded chamber door shielding the whole machine electronic integrated test chamber door 14 meters wide, 7 meters high. Manufacturing process of the gate complex, difficult, is the key to influence the shielding effectiveness. Manufactured in foreign countries that require the door to millions of dollars. To meet the shielding requirements, must be double-sided pressure closed the door, sliding door opening and closing electric technique.
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