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EMC Problems

EMC Problems. PACS SVR. B. Voss. Results PACS EMC-Test. EMC test of Herschel EQM IMT on PACS AVM warm electronics together with FPU CQM Electric field susceptibility tests passed for both, photometer and spectrometer mode Magnetic field susceptibility tests passed for spectroscopy mode

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EMC Problems

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  1. EMC Problems PACS SVR B. Voss EMC

  2. Results PACS EMC-Test • EMC test of Herschel EQM IMT on PACS AVM warm electronics together with FPU CQM • Electric field susceptibility tests • passed for both, photometer and spectrometer mode • Magnetic field susceptibility tests • passed for spectroscopy mode • failed for photometry mode (NCR HP-113000-ASED-NC-1772) EMC

  3. H-Field Susceptibility in Photometer Mode • PACS Photometer irradiated by H-field • 120dBpT for 30Hz to 20kHz • 110dBpT for 20kHz to 50kHz • IID-A requirement is 140dBpT! • deviations of photometer signals could be observed • sensitive areas for PACS are • section of cryostat wall where photometer is behind • cryo-harness sections • PACS harness near warm electronics EMC

  4. H-Field Susceptibility in Photometer Mode • susceptible at all 3 positions for frequencies above 1kHz • susceptibility thresholds maximum 30dB below required test levels (PACS-ME-TR-069) • the magnetic field causes an offset in the bolometer signal • susceptibility confirmed on unit level (QM-2) EMC

  5. H-Field Susceptibility in Photometer Mode • solar generator is main source of H-field at spacecraft level • some wires and connectors are very close to one solar panel • switching section of solar supply are in front of cryo-harness • switching frequency at 1 to 4kHz plus peaks up to several 100kHz • model calculations showed a high H-field (more than one magnitude higher as tolerable) near PACS main SVM connector bracket EMC

  6. H-Field Susceptibility in Photometer Mode • possible reductions of H-field impact at spacecraft level • mu-metal shielding • no longer pursued solution • swapping active sections of solar array • preferred solution • no switching will occur near PACS harness • implementation currently in progress at Alcatel Space EMC

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