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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_1183095"> <strong><font face="黑体"><font style="font-size:16pt"><strong>频谱分析仪选型指南</strong></font></font><font face="Arial"><font style="font-size:16pt"></font></font></strong><div align="left">1. 频率范围：频谱工作时所能分析的信号频率范围。为频谱的首选指标，必须</div><div align="left">保证<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>信号在频谱的工作频率范围以内。</div><div align="left">2. 输入功率：频谱的输入功率分为平均连续、脉冲输入功率。平均连续功率是</div><div align="left">指仪器能连续输入信号的最大功率值。脉冲输入功率是指频谱能<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>的脉冲</div><div align="left">输入功率的值（严格遵守厂家要求的脉冲宽度，占空比参数）。输入功率一</div><div align="left">般单位用dBm 表示，dBm 是一个考征功率绝对值的值，计算公式为：10lg（功</div><div align="left">率值/1mw）。例如：0 dBm = 1 mW，20 dBm = 100 mW，30 dBm = 1000 mW =</div><div align="left">1W。</div><div align="left">3. 输入阻抗：分析仪对信号源呈现的终端阻抗。射频和微波分析仪的额定阻抗</div><div align="left">通常是50 Ω。对于某些系统(如有线电视)，标准阻抗是75 Ω。阻抗不</div><div align="left">匹配将造成很大的测量误差，甚至干扰<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电路</a>运行。</div><div align="left">4. 平均噪声电平（DANL）：平均噪声电平相当于频谱自身噪声的大小，选择与</div><div align="left">工程师所测量的最小信号幅度有关。理想状态DANL越小越好，但是随着DANL</div><div align="left">越小需要的技术复杂程度越高价格就越为昂贵。测量如同在航行时只有海水</div><div align="left">低于礁石的时候我们才能看见礁石。</div><div align="left">5. 前置放大器：在频谱内增加一个微小信号放大模块，可以改善系统(前置放</div><div align="left">大器和频谱分析仪) 灵敏度。主要用于测量微小信号。</div><div align="left">6. 跟踪源：在频谱内增加一个与频谱同步的扫频信号源。添加跟踪源后可进行</div><div align="left">标量网络参数测量，例如：可以测试被测单元(如放大电路,滤波电路)的频</div><div align="left">率特性曲线，配合驻波比测试套件也可以实现反射系数、回波损耗、驻波的</div><div align="left">测量。</div><div align="left">频谱主要品牌：</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">安利（ANRITSU）</div><div align="left">安诺尼（Aaronia）</div><div align="left">爱德万（advantest）</div><div align="left">固纬（GWINSTEK）</div><div align="left">依爱（中电41所）</div><div align="left">使用注意事项：</div><div align="left">使用前确定仪器良好接地。频谱在使用中应避免用手直接触碰输入接口，以免静</div><div align="left">电将前端损毁。测量过程中一定要注意测量信号功率是否在我使用仪器的测量范</div><div align="left">围内，除有特殊规定外严禁测量含有直流成分的信号，否则会造成频谱损伤。</div><div align="left">选型小提示：</div><div align="left">在测量信号频谱时若信号为偶发跳变信号，则普通扫频式频谱因扫描速度较慢将</div><div align="left"><font face="宋体"><font style="font-size:12pt">很难测量到信号，需要使用最新的实时类频谱。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">电源选型指南</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">1. 输出类型：电源是<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>工程师最常接触的仪器，选择电源首先需要选择电源</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">的类型：直流电源、交流电源、变频电源、特种高压电源等。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">2. 输出电压：电源所能输出的电压范围。同时需要选择是否需要恒电压输出和</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">过电压保护。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">3. 输出电流：电源所能输出的电流范围。同时需要选择是否需要恒电流输出和</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">过流保护。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">4. 输出功率：当电源满载时所能输出的最大功率值。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">5. 通道数：输出供电接口的路数。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">6. 纹波：由于直流稳定电源一般是由交流电源经整流稳压等环节而形成的，这</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">样就不可避免地在直流稳定量中多少带有一些交流成份，这种叠加在直流稳</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">定量上的交流分量就称之为纹波。纹波越小将对电路的工作影响将越小。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">7. 负载调整率：当输入电压不变，负载从零变化到额定值时，输出电压的变化。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">通常用百分比表示。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">8. 输出电压编程精度：可编程电源设定值与实际输出值之间的偏差。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">电源主要品牌：</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">阿美特克（AMTEK）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">东电化兰达（TDK-lambda）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">菊水（KIKUSUI）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">惠美（HAMEG）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">恩乃普（NF）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">致茂（Chroma）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">艾德克斯（ITECH）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">固纬（GWINSTEK）</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">电源附件选择：</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">1. <a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>接口：因现在很多大功率电源都是装配在某些特定系统中，所以系统需</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">要哪些特定的通讯接口必须在购买前期进行沟通确认。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">选型注意事项：</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">电源选择时一定要注意考虑电源的用途。例如：对于电容器老炼来说，纹波只要</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">不是太大，一般对电容器老炼质量不会构成影响，所以普通电源即可。而对于高</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">速数字电路，纹波和噪声达到一定幅值后会干扰数字逻辑电路的正常工作，引起</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt">误触发和逻辑错误。这时对于电源的选择就应是高精度低纹波和噪声的电源。</font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt"> </font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt"><strong> </strong></font></font><font face="宋体"><font style="font-size:12pt"><strong>以上信息由西安安泰测试设备有限公司整理，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电子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。</strong></font></font><font face="宋体"><font style="font-size:12pt"></font></font></div><div align="left"><font face="宋体"><font style="font-size:12pt"><strong> 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。 </strong></font></font><font face="宋体"><font style="font-size:12pt"><strong><br /> 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