示波器测量传输时延

Jiely

请问各位GGJJ：
       现在本人已有高频数字存储示波器（100M），想测量GSM900直放站的传输时延，不知道能不能测试？？？？有人告诉我，测试结果与矢网分析仪测试的结果差不多，难道传输时延与频率没有关系吗？？
       强烈跪求！！

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<P>可以测，不过要有一个信号源，工分两路，一路作为直放站的输入信号，另一路作为参考信号（也就是参考信号）就可测出时延。</P><P>测量传输时延的精确度和仪器的采样速率有关，所以和频率也有关，也就是要求再一个周期内需要若干采样点。</P>

Jiely

楼上的：  
那你用的示波器实际带宽是多大？100M这样的示波器去测900M的信号怎么处理才能读出时延。请赐教。

xpan

<P>你看的是时域又不是频域</P>

Jiely

<P>谢谢，xpan老兄！！</P><P>非常感谢</P>

Jiely

<P normal">6.14.4 测量方法2<p></p></P><P normal">    1．按图11所示连接测试系统；<p></p></P><P normal"><v:group><lock position="t" aspectratio="t" rotation="t" v:ext="edit"></lock><v:shapetype><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path connecttype="rect" gradientshapeok="t" extrusionok="f"></v:path><lock aspectratio="t" v:ext="edit"></lock></v:shapetype><v:shape><v:fill detectmouseclick="t"></v:fill><v:path connecttype="none" extrusionok="t"></v:path><lock v:ext="edit" text="t"></lock></v:shape><v:group><v:shapetype><v:stroke joinstyle="miter"></v:stroke><v:path connecttype="rect" gradientshapeok="t"></v:path></v:shapetype><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1029"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P 5.25pt; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt">AM/PM调制</P><P>RF信号发生器</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1030"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P 5.25pt; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt">功分器</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1031"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P>可变衰减器</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1032"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P>被测直放站</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1033"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P>功率衰减器</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1034"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P 5.25pt; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt">数字示波器</P><P>CH1    CH2</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line></v:line><v:line></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line></v:line><v:line></v:line><v:line></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line><v:stroke dashstyle="dash"></v:stroke></v:line><v:line><v:stroke dashstyle="dash"></v:stroke></v:line><v:line><v:stroke endarrow="block" dashstyle="dashDot"></v:stroke></v:line><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1049"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P>图11  传 输 时 延 测 量</P></DIV></TD></TR></TABLE></v:textbox></v:shape></v:group><w:anchorlock></w:anchorlock></v:group><v:shape><v:imagedata cropbottom="65520f" croptop="-65520f"></v:imagedata><lock position="t" rotation="t" v:ext="edit"></lock></v:shape><p></p></P><P normal">    2．信号发生器用50kHz作幅度或脉冲调制，RF频率调到被测直放站中心频率；<p></p></P><P normal; TEXT-INDENT: 21pt">3．数字存储示波器上接通CH1和CH2，调时间轴、垂直轴、位置，使示波器有如图12所示的显示，用标记读出无被测直放站时的时延t1（μs）及有被测直放站时的时延t2（μs）；<p></p></P><P normal; TEXT-INDENT: 21pt">4．被测直放站的时延为△t=t2-t1（μs）<p></p></P><v:shape></v:shape><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV class=shape 3.6pt; PADDING-LEFT: 7.2pt; PADDING-RIGHT: 7.2pt; PADDING-TOP: 3.6pt" v:shape="_x0000_s1071"><P>图10   示波器上时延显示</P></DIV></TD></TR></TABLE><v:group><lock position="t" aspectratio="t" rotation="t" v:ext="edit"></lock><v:shape><v:fill detectmouseclick="t"></v:fill><v:path connecttype="none" extrusionok="t"></v:path><lock v:ext="edit" text="t"></lock></v:shape><v:rect></v:rect><v:line></v:line><v:group><v:shape><v:textbox inset="6.48pt,3.24pt,6.48pt,3.24pt"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P 19pt; mso-char-indent-count: 2.0; mso-char-indent-size: 9.5pt">△t<p></p></P><P 14.25pt; mso-char-indent-count: 1.5; mso-char-indent-size: 9.5pt">t1  t2<p></p></P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:path arrowok="t"></v:path></v:shape><v:shape><v:path arrowok="t"></v:path></v:shape><v:shape><v:path arrowok="t"></v:path></v:shape><v:shape><v:path arrowok="t"></v:path></v:shape><v:line><v:stroke dashstyle="dash"></v:stroke></v:line><v:line><v:stroke dashstyle="dash"></v:stroke></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line></v:line><v:line></v:line><v:shape><v:textbox inset="6.48pt,3.24pt,6.48pt,3.24pt"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P>CH1扫描轨迹<p></p></P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox inset="6.48pt,3.24pt,6.48pt,3.24pt"><TABLE cellPadding=0 cellSpacing=0 width="100%"><TR><TD><DIV><P>CH2扫描轨迹<p></p></P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:line></v:line><v:line></v:line><v:line></v:line></v:group><w:anchorlock></w:anchorlock></v:group><v:shape><v:imagedata cropbottom="65520f" croptop="-65520f"></v:imagedata><lock position="t" rotation="t" v:ext="edit"></lock></v:shape>

Jiely

<P>没法，图形上不去</P>

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<DIV class=quote><B>以下是引用<I>Jiely</I>在2006-1-16 16:34:55的发言：</B>

<P normal?>6.14.4 测量方法2


<p>
<P normal?>    1．按图11所示连接测试系统；
<p>
<p>
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<DIV>
<P 10.5pt? mso-char-indent-size: .5; mso-char-indent-count: 5.25pt;>AM/PM调制</P>
<P>RF信号发生器</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1030">
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<P 10.5pt? mso-char-indent-size: .5; mso-char-indent-count: 5.25pt;>功分器</P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1031">
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<P>可变衰减器
是不是少写了隔离器，防止带外杂散对示波器的损害

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是不是少写了隔离器，防止带外杂散对示波器的损害