频谱分析仪LO信号问题

亲爱的先生：我拥有一台频谱分析仪，我使用的是HP 8593E频谱分析仪（SA）。
我使用的两个单元都有同样的问题。
SA本地振荡器出现在屏幕上，有时很难用LO信号进行测量，因此频率接近我的测试信号。
我正在寻求在未来购买另一种Agilent SA，我想知道HP / Agilent什么时候开始生产抑制L.O.的SA。
来自显示器的信号？
我假设安捷伦多年来一直在制造SA，这个问题已被消除。
我的下一个问题是我需要回答的直接问题：HP 8593E SA的带宽（BW）为9KHz到22GHz。
这是我的问题。
我需要测量大约10 KHz的信号。
我从函数发生器输入一个信号并将信号输出到SA，我在显示屏上看到一个空白屏幕。
我对自己说，“我的信号在哪里。”
我阅读了关于测量低频信号或与LO信号频率接近的信号的手册，手册指示我在测试设置中使用“耦合器”。
该手册没有具体说明使用哪种类型的“耦合器”。
在电气工业中，有许多设备使用术语“耦合器”。
请告诉我如何使用HP 8593E SA正确测量低频信号。
在您的回复中，请指定在测试设置中使用的部件，以及测试设置。
可以理解用于低频测量的测量模式或按钮按压。
我的装置可能无法正常工作。
如果你怀疑这一点，请告诉我如何测试它是否运行不正常。
这让我相信可能存在问题：当我开始使用频率和跨度按钮时，LO信号出现了。
我注意到各种设置下的LO信号很大，我知道这是一个令人讨厌的信号。
如果可以的话，请告诉我如何从测量中消除这个信号及其谐波（或者，至少检测一下谐波，以便我知道我正在看一个错误的读数）。
感谢您的时间。
编辑：SOLT_guy于2012年7月14日上午7:49编辑：SOLT_guy于2012年7月15日12:44 PM编辑：SOLT_guy于2012年8月2日上午9:36



以下为原文

Dear Sir:

I own a spectrum analyzer and I use a HP 8593E spectrum analyzer (SA) where I work.

Both units that I use have the same issue. The SA local oscillator appears on the screen and some times it is difficult to make measurements with the LO signal so close to my test signal in frequency.

I am seeking to purchase another Agilent SA in the future and I want to know when did HP/Agilent begin making SAs that supress the L.O. signal from the display? I am assuming that this problem has been eliminated over the years Agilent has been making SAs.

My next question is an immediate question which I need to have answered:

The HP 8593E SA has a bandwidth (BW) of 9KHz to 22GHz. This is my problem. I needed to measure a signal at approximately 10 KHz. I input a signal out of my function generator and output the signal to the SA and I saw a blank screen on the display. I was saying to myself, "where is my signal."

I read the manual about measuring low frequency signals, or signals that are close in frequency to the LO signal, and the manual instructed me to use a "coupler" in my test set up. The manual does not specifically assert which type of "coupler" to use. There are lots of devices that use the term, "coupler", in the electrical industry.

Please tell me exactly how to correctly measure a low frequency signal using the HP 8593E SA. In your reply, please specify the parts to use in the test set up , as well as, the test set up. Measurement mode, or button presses, for low frequency measurements would be appreciated.

It may be possible that my unit is not working correctly. If you suspect this, please tell me how to test to see if it is not operating correctly.

This is what leads me to believe that there may be a problem:

The LO signal came up when I began to play with the frequency and span buttons. I noticed a large LO signal at various settings and I know that this is nuisance signal.

If this is possible, please tell me how I can eliminate this signal and its h ARMonics from my measurements (or, at least, detect the harmonics, so that I know I am looking at a false reading).

Thank you for your time.

Edited by: SOLT_guy on Jul 14, 2012 7:49 AM

Edited by: SOLT_guy on Jul 15, 2012 12:44 PM

Edited by: SOLT_guy on Aug 2, 2012 9:36 AM