1、Best Practices Entry: Best Practice Info:a71 Committee Approval Date: 2000-04-17a71 Center Point of Contact: JPLa71 Submitted by: Wil HarkinsSubject: Thick Dielectric Charging/Internal Electrostatic Discharge (IESD) Practice: Dielectric compositions used in such spacecraft materials as circuit board
2、s, cable insulation and thermal blankets will build up an imbedded charge when exposed to a natural space environment featuring energetic electrons. If the electric field resulting from the imbedded charge exceeds the breakdown threshold for the dielectric, an arc will occur, damaging the dielectric
3、 and producing an electromagnetic pulse which can couple into subsystem electronics.Enhance hardware reliability in an energetic electron environment by conducting a materials inventory, resistivity analysis, and shielding assessment. Ascertain material susceptibility to deep dielectric charging and
4、 explosive discharge when the material:1. Is exposed to an energetic electron flux exceeding 2x105electrons/(cm2-s), and2. Achieves an imbedded charge density greater than a threshold of 1011electrons/cm2.Abstract: Preferred Practice for Design they produce electromagnetic pulses that can couple int
5、o subsystem electronics, resulting in anomalous spacecraft behavior. Dielectric breakdown and material failure also occurs.Related Practices: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Additional Info: Approval Info: a71 Approval Date: 2000-04-17a71 Approval Name: Eric Raynora71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
