欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    REG NASA-LLIS-0767--2000 Lessons Learned Conducted and Radiated Emissions Design Requirements.pdf

    • 资源ID:1018413       资源大小:14.89KB        全文页数:3页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    REG NASA-LLIS-0767--2000 Lessons Learned Conducted and Radiated Emissions Design Requirements.pdf

    1、Best Practices Entry: Best Practice Info:a71 Committee Approval Date: 2000-04-06a71 Center Point of Contact: JPLa71 Submitted by: Wilson HarkinsSubject: Conducted and Radiated Emissions Design Requirements Practice: Initially, the design requirements for each subsystem are established so that all no

    2、n-functional emissions will be at least 9 Db below the emission specification limit.Abstract: Preferred Practice for Design from NASA Technical Memorandum 4322A, NASA Reliability Preferred Practices for Design and Test.Provided by IHSNot for ResaleNo reproduction or networking permitted without lice

    3、nse from IHS-,-,-By initially selecting a 9 Db margin, the probability of complying with the electromagnetic compatibility (EMC) specification during system test is high.Implementation Method:Radiated and conducted emission specifications established for the customer are based on overall theoretical

    4、 requirements which will meet the system specifications. The following design practices for subsystems allow for measurement error, combined effects, and manufacturing tolerance. This assures that an adequate margin will be realized when the final system performance is evaluated.In those cases where

    5、 an outside agency imposes the allowable emissions levels, the included margins must be taken into consideration so that excessive constraints are not applied. When a specific requirement is identified as a major cost driver for design, margin allocations should be reviewed for possible relief.Condu

    6、cted Emissions:Out-of-specification conducted emission on power, control, and signal lines can usually be controlled by a low-pass filter to reduce or eliminate unnecessary high-order harmonics. On digital circuits, a compromise must be made between the need for square pulses and the suppression of

    7、high-order harmonics.Radiated Emissions:Radiated emission can be reduced by cancellation, cross polarization, or by either magnetic or electric field shielding.In some cases, radiated emission can be reduced by using a balanced design so that the external magnetic or electric fields are cancelled or

    8、 cross-polarized at a particular sensor.Shielding can be added if the additional weight can be tolerated. Otherwise, increasing the separation distance between the emitter and a sensor may be adequate.Low frequency magnetic and electric field emissions must consider the inverse cube relation between

    9、 amplitude and the separation between source and sensor in order to determine an adequate separation.Technical Rationale:By allowing a 9 Db margin at the design phase, there is sufficient tolerance to provide a high degree of confidence that the equipment will pass the system EMC tests. 9 Db is need

    10、ed to account for the differences between idealized theory and practice plus the test margin. The test margin covers both Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-manufacturing tolerance and measurement tolerance.Impact of Non-Practice: Out-of

    11、-specification performance may occur during system EMC tests. The risk of higher cost and the impact on the schedule, late in the program, must be weighed against the cost of providing a reasonable design margin during the design phase of a program.Related Practices: N/AAdditional Info: Approval Info: a71 Approval Date: 2000-04-06a71 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-,-,-


    注意事项

    本文(REG NASA-LLIS-0767--2000 Lessons Learned Conducted and Radiated Emissions Design Requirements.pdf)为本站会员(cleanass300)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开