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color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 区分模拟带宽和数字实时带宽</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 带宽是示波器最重要的指标之一。模拟示波器的带宽是一个固定的值，而数字示波器的带宽有模拟带宽和数字实时带宽两种。数字示波器对重复信号采用顺序采样或随机采样技术所能达到的最高带宽为示波器的数字实时带宽，数字实时带宽与最高数字化频率和波形重建技术因子K相关(数字实时带宽=最高数字化速率/K)，一般并不作为一项指标直接给出。从两种带宽的定义可以看出，模拟带宽只适合重复周期信号的测量，而数字实时带宽则同时适合重复信号和单次信号的测量。厂家声称示波器的带宽能达到多少兆，实际上指的是模拟带宽，数字实时带宽是要低于这个值的。例如说TEK公司的TES520B的带宽为500MHz，实际上是指其模拟带宽为500MHz，而最高数字实时带宽只能达到400MHz远低于模拟带宽。所以在测量单次信号时，一定要参考数字示波器的数字实时带宽，否则会给测量带来意想不到的误差。</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 有关采样速率：采样速率也称为数字化速率，是指单位时间内，对模拟输入信号的采样次数，常以MS/s表示。采样速率是数字示波器的一项重要指标。</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 1.如果采样速率不够，容易出现混迭现象</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 如果示波器的输人信号为一个100KHz的正弦信号，示波器<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>的信号频率却是50KHz，这是怎么回事呢?这是因为示波器的采样速率太慢，产生了混迭现象。混迭就是屏幕上显示的波形频率低于信号的实际频率，或者即使示波器上的触发指示灯已经亮了，而显示的波形仍不稳定。混迭的产生如图1所示。那么，对于一个未知频率的波形，如何判断所显示的波形是否已经产生混迭呢?可以通过慢慢改变扫速t/div到较快的时基档，看波形的频率参数是否急剧改变，如果是，说明波形混迭已经发生;或者晃动的波形在某个较快的时基档稳定下来，也说明波形混迭已经发生。根据奈奎斯特定理，采样速率至少高于信号高频成分的2倍才不会发生混迭，如一个500MHz的信号，至少需要1GS/s的采样速率。</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 数字示波器的上升时间</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 在模拟示波器中，上升时间是示波器的一项极其重要的指标。而在数字示波器中，上升时间甚至都不作为指标明确给出。由于数字示波器测量方法的原因，以致于自动测量出的上升时间不仅与采样点的位置相关，如图2中a表示上升沿恰好落在两采样点中间，这时上升时间为数字化间隔的0.8倍。图2中的b的上升沿的中部有一采样点，则同样的波形，上升时间为数字化间隔的1.6倍。另外，上升时间还与扫速有关，下面是TDS520B测量同一波形时的一组扫速与上升时间的数据：</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 由上面这组数据可以看出，虽然波形的上升时间是一个定值，而用数字示波器测量出来的结果却因为扫速不同而相差甚远。模拟示波器的上升时间与扫速无关，而数字示波器的上升时间不仅与扫速有关，还与采样点的位置有关，使用数字示波器时，我们不能象用模拟示波器那样，根据测出的时间来反推出信号的上升时间。</font></font></font><font color="#333333"></font></div><div align="left"><font color="#333333"><font face="宋体"><font style="font-size:9pt"> 以上介绍的就是数字示波器你会使用吗，希望对您能有所帮助。</font></font></font></div><font color="#333333"><font face="宋体"><font style="font-size:9pt"><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" 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