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onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=293568&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-293568-1-1.html" id="postnum1180140" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon1180140" src="static/image/common/online_member.gif" /> <em id="authorposton1180140">发表于 2016-1-15 16:05:15</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=293568&page=1&authorid=162299" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=293568&extra=&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 1180140);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_1180140"> <div align="left">信号源选型指南</div><div align="left">1.带宽：信号源的带宽是信号源所能输出的最大正弦波的频率。例如250MHz</div><div align="left">的信号源是指他的正弦波输出频率最大能到250MHz。</div><div align="left">2. 通道数：在使用信号源时需要信号源能同时输出信号的路数。现在信号源的</div><div align="left">通道分为模拟波形输出通道和数字波形输出通道。不同信号源厂家的配制相</div><div align="left">差很大。</div><div align="left">3. 采样率：信号源在输出波形时从内存中取点输出的速度为信号源的采样率。</div><div align="left">采样率越高对于波形的还原程度也越高。</div><div align="left">4. 垂直分辨率：在混合信号发生器中，垂直分辨率与仪器DAC 的二进制字长度</div><div align="left">(单位为位)有关，位越多，分辨率越高。DAC的垂直分辨率决定着复现的波</div><div align="left">形的幅度精度和失真。分辨率不足的DAC 会导致量化误差，导致波形生成不</div><div align="left">理想。尽管越高越好，但在AWG 中，频率较高的仪器的分辨率(8 位或10 位)</div><div align="left">通常要低于12 位或14 位的通用仪器。</div><div align="left">5. 输出信号幅度：信号源的输出幅度需要根据实验人员所使用的幅度范围进行</div><div align="left">选择。例如：音响研发工程师需要的信号多为10~100V的大驱动信号，而医</div><div align="left">疗器械研发工程师所关注的生物电波则集中在uV~mV范文内。</div><div align="left">6. 任意波可编辑长度：现在的信号源一般都叫做--函数/任意波信号源，所谓</div><div align="left">任意波就是指可以根据使用者要求自己任意编辑的波形。波形长度即用来描</div><div align="left">绘你所创建的波形所用的点的数量。描述的点越多，还原的波形越真实形态。</div><div align="left">例如：现在的示波器可以将采集的现场数据波形保存，然后在实验室里面用</div><div align="left">信号源复现。若示波器的存储深度为1Mpts，那么信号源的任意波长度只有</div><div align="left">不小于1Mpts时才能将信号完美复现。</div><div align="left">7. 相位噪声：相位噪声是指单位Hz的噪声密度与信号总功率之比,表现为载波</div><div align="left">相位的随机漂移,是评价频率源(振荡器)频谱纯度的重要指标。</div><div align="left">信号源主要品牌：</div><div align="left">安捷伦（Agilent）</div><div align="left">泰克（Tektronix）</div><div align="left">艾法斯（Aeroflex）</div><div align="left">罗德与施瓦茨（R&S）</div><div align="left">普源精电（Rigol）</div><div align="left">恩乃普（NF）</div><div align="left">塔伯尔（Tabor）</div><div align="left">依爱（中电41所）</div><div align="left">选型注意事项：</div><div align="left">信号源一般是只主要作为一个激励信号源，他的功率驱动能力极小（mW级）。</div><div align="left">所以如果需要用信号源来驱动后级负载（例如：喇叭，马达），则需要加装</div><div align="left"><font face="宋体"><font style="font-size:12pt">功率放大器或者选择功率信号源。</font></font></div><font face="宋体"><font style="font-size:12pt"><div align="left">以上信息由西安安泰<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>设备有限公司整理，希望对您能有所帮助。西安安泰测试设备有限公司是一家专注于<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>测试及工业测试领域仪器销售与仪器维修的专业公司。为客户提供“丰富的测试<a href="http://b.oecr.com/sell" target="_blank" class="relatedlink">产品</a>选择、完整的系统测试解决方案、专业的测试<a href="http://opticaldesign.oecr.com" target="_blank" class="relatedlink">软件</a>开发、全面的技术支持及售后服务”。目前公司主要进行电子测试仪器的销售及维修，自研产品的开发，已经成为西北地区规模最大的仪器综合服务商之一。</div><div align="left"> </div><div align="left"> 测试仪器维修事业部拥有多名丰富维修经验的高级工程师，能够完成各种测试仪器与测试系统的芯片级维修。我们提供免费样机试用，免费专业工程师培训，免费测试技术交流。 <br /> 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