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频谱分析仪的性能指标怎么理解

2013-09-26 23:43 wangjingaiha | 分类：数学
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2013-09-27 16:30 提问者采纳 
安泰测试提示：RBW：分辨率带宽，表征频谱仪能够分辨相邻的俩个频率分量的能力DANL：显示平均噪声电平，频谱仪的底噪，他能测试到的最小信号幅度精度：频谱仪测试信号时幅度或者功率上的精度指标相噪：频谱仪的固有相位噪声，主要由频谱仪的本振不确定度造成动态范围：频谱仪能够测试的信号功率的范围
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谢谢!
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shaoyubin111 | 一级 采纳率100%

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2013-09-27 10:42 网友采纳 
频谱分析仪是在频域内测量信号的设备，主要测量两个量：横轴频率和纵轴幅度。但由于其构造原理，存在着一些影响其测量准确度的分量，这些能对测量结果引入误差的分量的大小就决定了频谱分析仪的性能指标。比如参考频率、扫频宽度、分辨力带宽、输入衰减、显示平均噪声电平、二次谐波失真、噪声边带、频率响应等等。
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!function(){ require.async('common:widget/userbar-new/userbar-new.js'); }(); !function(){ require.async('common:widget/js/logic/search-box/search-box.js'); }(); !function(){require.async('common:widget/menu/menu.js', function(menu){ menu.init(); }); }(); !function(){ require.async('question:widget/share/share.js'); }(); !function(){ require.async('question:widget/ask/ask.js'); }(); !function(){ require.async('question:widget/value-comment/value-comment.js',function(vc){ vc.init('1498117964'); }); }(); !function(){ require.async('question:widget/related/related.js', function(rel){ rel({ cmsRelq: "", cmsRelqrl: "", isLog: false }); }); }(); !function(){ require.async(['common:widget/lib/jquery/jquery.js', 'common:widget/js/util/log/log.js'], function($, log) { $(".wgt-best .best-text").on('click', ".answer-expand", function(e) { $(this).hide(); $(".wgt-best .best-text .answer-expand-content").hide(); $(".wgt-best .best-text .answer-collapse-content").show(); $(".wgt-best .best-text .answer-collapse").show(); 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$(".wgt-recommend .recommend-text").on('click', ".answer-collapse", function(e) { $(this).hide(); $(".wgt-recommend .recommend-text .answer-collapse-content").hide(); $(".wgt-recommend .recommend-text .answer-expand-content").show(); $(".wgt-recommend .recommend-text .answer-expand").show(); }); }); }(); !function(){ require.async('common:widget/js/util/log/log.js', function(log) { // 展现相关问题的PV log.addKey({topic_show: '1'}); // 实验 }); }(); !function(){ require.async('common:widget/js/util/log/log.js', function(log){ //展现推送问题的PV log.addKey({push: '1'}); }); }(); !function(){require.async('question:widget/user/info/daily/daily.js', function(Daily){ Daily.init({"date":"2014.12.27","term":"486","list":[{"id":"3419","title":"\u54ea\u4e9b\u9886\u5bfc\u4eba\u66fe\u906d\u9047\u523a\u6740\uff1f","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=6873e68da8c474c1762ce000acc1f0ce&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F2.jpg"},{"id":"3422","title":"\u201c\u4eb2\u60c5\u5524\u9192\u201d\u5bf9\u690d\u7269\u4eba\u6709\u6548\u5417\uff1f","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=831a7d749f6fef68e57cc619dd263b95&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F5.jpg"},{"id":"3418","title":"\u3010\u5e74\u5ea6\u76d8\u70b9\u30112014\u5e74\u77e5\u9053\u65e5\u62a5\u5341\u5927\u5e74\u5ea6\u201c\u65b0\u77e5\u201d","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=a9e9c252e4b90729c4f6fde9b18dd538&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F1.jpg"},{"id":"3420","title":"\u559d\u679c\u6c41\u6bd4\u5403\u6c34\u679c\u66f4\u597d\u5417\uff1f","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=14881ea25674d3ca02f2b6578c117669&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F3.jpg"},{"id":"3424","title":"\u80fd\u91cf\u996e\u6599\uff0c\u5982\u4f55\u8d50\u4e88\u4f60\u80fd\u91cf\uff1f","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=80674a277d6e7bed1ff4eb39a35507f9&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F7.jpg"},{"id":"3421","title":"\u5f00\u6c34\u4e5f\u6709\u4fdd\u8d28\u671f\uff1f","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=fa0bcfee8e6e9e7c8802c8428e80a193&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F4.jpg"},{"id":"3423","title":"\u7a7a\u6c14\u6e05\u65b0\u5242\u80fd\u5426\u6e05\u65b0\u7a7a\u6c14\uff1f","mt_img_src":"http:\/\/mt1.baidu.com\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=d61c7b2115320c74e4d8724c569a5cf9&src=http%3A%2F%2Fimg.iknow.bdimg.com%2Fjctuijian%2F1227%2F6.jpg"}]}, '0'); }); }(); !function(){ require.async('question:widget/user/nologin/nologin.js'); }(); !function(){ require.async('question:widget/user/nologin-daily/nologin-daily.js'); }(); !function(){require.async('common:widget/js/logic/union/union.js', function(union){ // args[2, 3]自定义定向使用, common:union中有限制只能调用一次; union('968278', 'union-qbrightdown', { 'zdquery' : '', 'zdclassid' : '983', 'zhidaoqid' : '197803520014649845' }); }); }(); !function(){ require.async('question:widget/ad-right/ad-right.js'); }(); !function(){ require.async(['common:widget/js/util/tangram/tangram.js', 'common:widget/js/util/log/log.js', 'common:widget/js/util/event/event.js', 'common:widget/js/logic/submit/submit.js', 'common:widget/js/ui/dialog/dialog.js', 'question:widget/js/file/file.js', 'question:widget/js/inner-link/inner-link.js', 'question:widget/js/xiaozhi/xiaozhi.js', 'question:widget/js/left-promotion/left-promotion.js', 'question:widget/js/video/video.js'], function($, log, ec, Submit, Dialog, File, innerLink, XiaoZhi, LeftPromotion, Video){ $(function(){ log.addKey({ qbleftdown: $('.qbleftdown').find('li').size(), qbrightdown:$('.qbrightdown').find('.r').size() }); if ( $( '.qbleftdown a' ).size() ) { log.addKey({ ec_ads: '2', ec_ads_count: $('.qbleftdown').find('a.ec_ad_title, span.ec_qad_title, a.EC_ad_title').size() }); $('.qbleftdown a').click(function(){ var $parent = $( this ).parent(); if ( this.id || this.className == 'EC_ad_title' || $parent.hasClass( 'EC_ads_answer' ) || this.className == 'EC_ads_listurl' || this.className == 'ec_ad_title' || $parent.hasClass('ec_qad_title') || $parent.hasClass('ec_qad_answerer') ) { log.send({ type: 2014, evtType: 'click', pos: 'ec_ads' }); } }); } require.async('question:widget/js/card/card.js', function(card){ $('.avatar-normal-a').add('.user-name').each(function(index, item){ new card({ target: item, type: 'normal' }); }); $('.avatar-mavin-a').add('.mavin-name').each(function(index, item){ new card({target: item, type: 'mavin' }); }); $('.avatar-expert-a').add('.expert-name').each(function(index, item){ new card({target: item, type: 'expert' }); }); $('.avatar-open-a').add('.open-name').each(function(index, item){ new card({target: item, type: 'open' }); }); $('.open-level').each(function(index, item){ new card({target: item, type: 'openLevel' }); }); }); $('.fixed-ask-e').click(function(e){ e.preventDefault(); var username = $(this).attr('username'); require.async('common:widget/js/logic/iask/iask.js', function(fixedAsk){ fixedAsk(username); }); }); $('.replyask-shrink a').click(function(e){ e.preventDefault(); var flag = this.innerHTML.indexOf('展开') != -1; var dl = $(this).text( flag ? '收起' : '展开全部对话' ).parent().prevAll('.replyask'); $($.makeArray(dl).reverse().slice(flag ? 0 : 14, dl.length)).css('display', flag ? 'block' : 'none'); }); if($('.thunder-wrap').size()){ require.async('question:widget/js/thunder/thunder.js', function(thunder){ $(function(){ thunder.init(); }); }); } $.each(F.context('answers'), function(index, item){ if(item.user){ var eSid = item.user.openSiteId; if(eSid&&(eSid>=100000&&eSid<=999999)){ $('#answer-'+index).on('click', '.content a,p[accuse="aRefer"] a', function(e){ $.post('/c/oi_cv/cv', $.url.jsonToQuery({ tp:205, rf:encodeURIComponent(document.referrer), ai:this.href, si:eSid }), function(res, status, ajx){}); }); } } }); $(document).on('click', '.ikqb_img', function(){ log.send({ type: 2014, bigimg: 'click' }); }); $('a.optimus').on('click', function() { log.send({ type: 2014, area: 'ad-right-optimus', action: 'click', cid: F.context('page')['cid'], cidTop: F.context('page')['cidTop'], cidMid: F.context('page')['cidMid'] }); }); $('#wgt-nologin-daily').click(function(e){ e.stopPropagation(); if($(e.target).closest('#daily-carousel').size() && !$(e.target).closest('.carousel-control').size()){ log.send({ type: 2014, page: 'question', pos: 'no-login-daily', action: 'click' }); } }); $('.wgt-daily').on('click', 'a', function(){ log.send({ type: 2014, page: 'question', pos: 'login-daily', action: 'click' }); }); $('.qbrightdown a').click(function(){ log.send({ type: 2014, qid: F.context('page')['qid'], area: 'medical-right-txt-ads', action: 'click' }); }); if($('ikaudio').size()){ log.addKey({ 'audio' : 1 }); require.async('question:widget/js/audio/audio.js', function(audio){ audio.init(); }); } renderInitInnerLink(); function renderInitInnerLink() { function initInnerLink(){ F.context('qb_youyisi',''); innerLink.init(2); } $('.best-text, .recommend-text, .answer-text').each(function(){ var aid = /\d*$/g.exec( this.id )[0]; if ( F.context('answers')[ aid ] ) { if ( $(this).find('.ed2k-wrap').size() ) { F.context('answers')[ aid ].insertLinkType = 1; } else if ( $(this).find('file').size() ) { F.context('answers')[ aid ].insertLinkType = 2; } else if ( $(this).find('pre[t="code"]').size() ) { F.context('answers')[ aid ].insertLinkType = 3; } } }); if ((F.context('page').cidTop == 74 || F.context('page').cidTop == 95 || F.context('page').cidTop == 77) && ($('.wgt-best').size() || $('.wgt-recommend').size())) { } else { initInnerLink(); } }; require.async('question:widget/js/comment/comment.js', function(comm){ comm.getCount(); }); $('.recommend-text, .best-text, .answer-text, .replyask-content').each(function(i, answerText){ $(answerText).find('pre[t="code"]').each(function(i, pre){ var loadSyntax = function(){ SyntaxHighlighter(pre); }; $(pre).text($(pre).html($(pre).html().replace(//ig, '##IK_LINEBREAK##')).text().split('##IK_LINEBREAK##').join('\n')); $(pre).addClass('brush:'+$(pre).attr('l')+';toolbar:false;'); if (window.SyntaxHighlighter) { SyntaxHighlighter.highlight(pre); $(answerText).find('.syntaxhighlighter .code .line').each(function(index, line){ $(answerText).find('.syntaxhighlighter .gutter .line').eq(index).height($(line).height()); }); } else { $.sio('http://img.iknow.bdimg.com/libs/SyntaxHighlighter/shCore.min.js').callByBrowser(function(){ SyntaxHighlighter.defaults['quick-code'] = false; SyntaxHighlighter.config.stripBrs = true; SyntaxHighlighter.highlight(pre); $(answerText).find('.syntaxhighlighter .code .line').each(function(index, line){ $(answerText).find('.syntaxhighlighter .gutter .line').eq(index).height($(line).height()); }); }); } }); $(answerText).find('ikvideo').each(function(i, video){ var id = 'VIDEO_' + $.id(), src = $(video).attr('src'), sid; var container = $('
').attr('id', id).insertBefore($(video)); if (src.indexOf('youku') > -1 && (sid = src.match(/sid\/(.*?)[\?\/]/))) { if (sid[1]) { src = 'http://player.youku.com/player.php/sid/'+sid[1]+'/v.swf'; } } container.html(''); }); }); log.send({ 'type' : 2014, 'page' : 'question', 'action': 'have_best_and_have_no_adopt' }); require.async('common:widget/js/ui/lazyload/lazyload.js', function(lazyload){ $('.wgt-replyer-best .avatar-48 a, .wgt-replyer-best .avatar-66 a, .wgt-replyer-special .avatar-66 a, #cms-company a').lazyload(); }); $('.ikqb-map').each(function(index, item) { var ifreamObj = $("