您在-600 kHz处看到的实际上是仪器LO馈通。
查看频率设置，起始频率不是10 Hz，实际为-45 MHz，停止频率为3.655 GHz（中心为1.805 GHz，跨度为3.700 GHz）。
对于具有该跨度的仪器的频率精度，标记值上的0kHz的600kHz误差是典型的。
您在-600 kHz处看到的信号未显示在峰值表中，因为仪器知道它是LO馈通并且忽略它。
就状态消息而言，它告诉您，您的调谐频率低于10 MHz且您仍处于交流耦合状态。
如果要获得低于10 MHz的精确测量，您需要转到输入/输出，RF输入菜单并将输入耦合从AC更改为DC。
看起来一切都运转得很好......最好的问候，迈克
以上来自于谷歌翻译
以下为原文
What you are seeing at -600 kHz is actually the instrument LO feedthrough. Looking at your frequency setting your start frequency is not 10 Hz, it is actually -45 MHz and your stop frequency is 3.655 GHz (Center is 1.805 GHz and Span is 3.700 GHz). With the frequency accuracy of the instrument with this span the 600 kHz error from 0 Hz on the marker value is typical.
The signal that you are seeing at -600 kHz is not showing up in the peak table because the instrument knows that it is the LO feedthrough and it ignores it.
As far as the status message goes, it is telling you that you are tuned below 10 MHz and you are still AC coupled. You need to go to the Input/Output, RF Input menu and change your input coupling from AC to DC if you want to get accurate measurements below 10 MHz.
It looks like everything is working just fine...
Best regards,
Mike
您在-600 kHz处看到的实际上是仪器LO馈通。
查看频率设置，起始频率不是10 Hz，实际为-45 MHz，停止频率为3.655 GHz（中心为1.805 GHz，跨度为3.700 GHz）。
对于具有该跨度的仪器的频率精度，标记值上的0kHz的600kHz误差是典型的。
您在-600 kHz处看到的信号未显示在峰值表中，因为仪器知道它是LO馈通并且忽略它。
就状态消息而言，它告诉您，您的调谐频率低于10 MHz且您仍处于交流耦合状态。
如果要获得低于10 MHz的精确测量，您需要转到输入/输出，RF输入菜单并将输入耦合从AC更改为DC。
看起来一切都运转得很好......最好的问候，迈克
以上来自于谷歌翻译
以下为原文
What you are seeing at -600 kHz is actually the instrument LO feedthrough. Looking at your frequency setting your start frequency is not 10 Hz, it is actually -45 MHz and your stop frequency is 3.655 GHz (Center is 1.805 GHz and Span is 3.700 GHz). With the frequency accuracy of the instrument with this span the 600 kHz error from 0 Hz on the marker value is typical.
The signal that you are seeing at -600 kHz is not showing up in the peak table because the instrument knows that it is the LO feedthrough and it ignores it.
As far as the status message goes, it is telling you that you are tuned below 10 MHz and you are still AC coupled. You need to go to the Input/Output, RF Input menu and change your input coupling from AC to DC if you want to get accurate measurements below 10 MHz.
It looks like everything is working just fine...
Best regards,
Mike
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