1、Best Practices Entry: Best Practice Info:a71 Committee Approval Date: 2000-03-02a71 Center Point of Contact: GSFCa71 Submitted by: Wil HarkinsSubject: Electrical Shielding of Power, Signal and Control Cables Practice: Practice: All wiring harnesses, cables, and wires on payloads, instruments, subsys
2、tems, and components are well shielded, including the use of connector types that provide tight EMI back shells or other means for attaching shields. This practice assumes that all efforts have been made to develop a design which requires minimum shielding.Programs that Certify Usage: Program Which
3、Certified Usage: All GSFC Flight programs.Center to Contact for Information: GSFCImplementation Method: This Lessons Learned is based on Reliability Practice No. PD-ED-1213; from NASA Technical Memorandum 4322A, NASA Reliability Preferred Practices for Design and Test.Benefit:High performance shield
4、ing on wiring harnesses, cables and wires minimizes radiated emissions from hardware that could be picked up by itself or other hardware and interfere with proper Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-operation. Shielding also minimizes the
5、 sensitivity of hardware to radiated emissions, from itself or other hardware, that could interfere with proper operation.Implementation Method:Cable shielding that can provide 60 dB or more of shielding effectiveness is used to meet the radiated emission and the radiated susceptibility requirements
6、 of GSFCs General Environmental Verification Specification for STS whereas, most commercial shielded cable has only 30 to 40 dB of shielding effectiveness.Related Practices: N/AAdditional Info: Approval Info: a71 Approval Date: 2000-03-02a71 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-,-,-
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