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嗨,我正在使用MXA 10Hz到3.6Ghz通过天线测量空中信号。
见附件。 我正在接收低于10Hz范围的信号-600KHz 8.82dBM但这个信号没有列在我的峰值表中。 这是正常的吗? 或者我的MXA有问题? 我看到屏幕右下方的消息,AC耦合,Accy unspec'd这是什么意思? 是否意味着使用MXA测量低于10Mhz的信号是不准确的? 请指教。 以上来自于谷歌翻译 以下为原文 Hi, I'm using MXA 10Hz to 3.6Ghz to measure signals over the air via antenna. See attached. I'm picking up a signal below the 10Hz range at -600KHz 8.82dBM but this signal is not listed in my peak table. Is this normal? or my MXA is having problem? I saw the message at bottom right of my screen, AC coupled, Accy unspec'd < 10MHz. What does this mean? is it meant that signals measured below 10Mhz are not accurate using MXA? Please advise. 附件
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2个回答
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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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cmh23 发表于 2019-4-25 17:15 嗨,迈克,谢谢你的帮助! 以上来自于谷歌翻译 以下为原文 Hi Mike, Thanks for your help! |
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