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.CRaTER Pre-Environmental Review: Engineering Updates & Design Changes

Get the latest updates on the engineering requirements and design changes for the .CRaTER assembly. Discover the mechanical, electrical, and data design changes that have been implemented since the Critical Design Review (CDR). Explore the thermal design changes and the thermal-vacuum test results on the flight unit's electronic components.

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.CRaTER Pre-Environmental Review: Engineering Updates & Design Changes

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  1. CRaTER Pre-Environmental Review(I-PER)Engineering Requirements/Design UpdatesBob Goeke September 10-11, 2007

  2. Resource Status

  3. Mechanical Design Changes since CDR • Top Cover was redesigned to increase the stiffness of the cover and the E-Box/CRaTER Assembly. • The material for the Digital to Analog cable clamp was changed from Teflon to Aluminum. • Added a floating nut plate on the telescope to provide mounting location for the Thermal Blanket hardware. • Redesigned strain relief for detector mounts

  4. Electrical Design Changes since CDR • Reduced analog gain of thin detectors by 3X per science requirement change. • Changed internal calibration low rate clock period from 2Hz to 8Hz • Added 32-sample averaging to housekeeping data • Rebuffered PWM DACs to reduce noise coupling from the digital 5VDC supply • Added relay on output of DDC 1553 module Data Design Changes since CDR • None

  5. Thermal Design Changes since CDR • No changes to design • Thermal model was found deficient in June TIM • Modeling software was not calculating conduction of e-box walls correctly. • Thermal blanket implementation doubled the effective radiating area of the (single layer) telescope aperture. • Net result is an increase in temperature gradient from the telescope to the mounting interface.

  6. Electronic Components • Thermal-Vacuum test results on Flight Unit internal components • Max junction numbers assume +40C instrument reference temperature (hot qual)

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