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姬盼希

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[问答]

EXA N9010A信号分析仪找不到EMC测量

各位大家好,我们最近购买了具有N6141A EMI测量应用的EXA N9010A信号分析仪10 Hz-3.6 GHz。
我试图对我们所拥有的调光器进行预兼容测量,并且得到了奇怪的结果(也许我做的事情很糟糕,因为我对EMC测量很新)。
问题是,当我进行测量时,与已在认证实验室中进行一致性测试的调光器相比,我得到的干扰值明显更高。
因此,在此之后,当分析仪的输入以50欧姆终止时,我尝试测量干扰。
我根据EN55015(9kHz-30MHz频段,RBW 200Hz和9kHz,步长50Hz和2.25KHz,探测器:黄色 - >峰值,蓝色 - >平均值)设置参数,并将迹线设置为MaxHold。
我还添加了根据EN55015输入的限制线。
您可以在附件中查看结果。
这读书好吗?
或者我的设置不正确?
另一个问题是我找不到EMC测量 - 应用测量指南中提到的.lim文件。
他们带分析仪还是我必须从某个地方下载它们?
干杯,米洛拉德。

以上来自于谷歌翻译


     以下为原文

  Hello everybody,

We have recently purchased EXA N9010A signal analyzer 10 Hz-3.6 GHz with N6141A EMI Measurement Application. I tried to make precompliance measurement for a dimmer that we have and I got strange results (maybe I am doing something in a bad way because I am pretty new to EMC measurements). Problem is that when I am doing conducted measurements I am getting significantly higher values of disturbances in compare to those already made for that dimmer in process of compliance testing in a certified lab. So, after that I tried to measure disturbances when the input of the analyzer is terminated with 50 Ohms. I set parameters according to EN55015 (9kHz-30MHz band, RBW 200Hz and 9kHz, step size 50Hz and 2.25KHz, detectors: yellow -> peak, blue -> average), and set traces to MaxHold. I also add limit lines that I entered according to EN55015. You can see the results in attached file.

Are this reading OK? Or my settings are incorrect?

Another problem is that I can't found .lim files that are mentioned in EMC Measurement - Application Measurement Guide. Do they come with analyzer or I have to download them from somewhere?

Cheers,
Milorad.   
附件

回帖(4)

李欢

2019-2-18 14:14:11
Hi Milorad - 较低频率的本底噪声较高,因为您是交流耦合的。
请注意显示屏右下角的状态消息。
要更改为DC耦合,请按输入/输出,RF输入,RF耦合(DC)。
按Recall,Data,Limit Lines,Open可以调出限制线。
导航到我的文档/ EMC限制和Ampcor /限制/ EN / 55015并选择适当的限制线,然后单击打开。
问候 -

以上来自于谷歌翻译


     以下为原文

  Hi Milorad -

The noise floor at the lower frequencies is high because you are AC coupled. Note the status message in the lower-right corner of the display. To change to DC coupled, press Input/Output, RF Input, RF Coupling (DC). 

The limit lines can be recalled by pressing Recall, Data, Limit Lines, Open. Navigate to My Documents/EMC Limits and Ampcor/Limits/EN/55015 and select the appropriate limit line and click Open. 

Regards -
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李健

2019-2-18 14:30:09
另外注意,提供的限制线现在是* .csv *格式,所以除非你有一个旧仪器,否则你的my documents文件夹中不会有旧的.lim *格式限制行。
手册需要更新。
最好的问候,迈克

以上来自于谷歌翻译


     以下为原文

  One other note, the limit lines provided are now in *.csv* format, so unless you have an older instrument you will not have the old *.lim* format limit lines in your my documents folder. The manual needs to be updated.

Best regards,
Mike
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姬盼希

2019-2-18 14:43:59
@tabbott,Mike M非常感谢!
我今天做了新测量,看起来更像是合规性测量。
我还有一个问题:我在哪里可以找到使用哪种平均值检测器(平均值,RMS平均值,EMI平均值),当我想根据EN55015进行测量时,我使用哪一种?
我想如果我想将结果与标准给出的限制进行比较,我需要使用EMI平均值,但这种测量非常慢。
如果我使用平均值检测器,它可以快速工作,但使用峰值和平均值检测器进行的测量之间没有太大差异(可以吗?)。
我阅读http://www.home.agilent.com/agilent/editorial.jspx?cc=RS&lc=eng&ckey=2184787&nid=-11143.0.00&id=2184787,我现在正在寻找一些解释
用于设置配置以获得满足标准要求的最快响应。
你能指点我去哪儿吗?
此致,Vukadin

以上来自于谷歌翻译


     以下为原文

  @tabbott, Mike M

Thanks a lot! 
I made new measurements today and they look more like compliance measurements. I have one more question: Where can I find for what is used which Average detector (Average, RMS Average, EMI Average), which one of them I use when I want to make measurements according to EN55015? I suppose that I need to use EMI Average if I want to compare results to limit given by standard, but this measurements are very slow. If I use Average detector, it works fast, but there is not much difference between measurements done with Peak and Average detector (is it OK?). I read http://www.home.agilent.com/agilent/editorial.jspx?cc=RS&lc=eng&ckey=2184787&nid=-11143.0.00&id=2184787 and I am now looking for some explanation for setting configuration to get fastest response that satisfies standard requirements. Can you point me where to look?

Regards,
Vukadin
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李健

2019-2-18 14:56:26
引用: c88348535 发表于 2019-2-18 14:43
@tabbott,Mike M非常感谢!
我今天做了新测量,看起来更像是合规性测量。
我还有一个问题:我在哪里可以找到使用哪种平均值检测器(平均值,RMS平均值,EMI平均值),当我想根据EN55015进行测量时,我使用哪一种?

野兽的本质是EMI探测器扫描速度慢...... EN 55015指定的平均探测器就是安捷伦所称的* EMI平均值*探测器。
我们的频谱分析仪多年来都有一个*平均值*探测器,多年来它们在不同的平均类型上都有一些增强。
但是,由于某些商业EMC标准要求的平均探测器与我们的频谱分析仪所具有的平均探测器有很大不同,我们需要通过给它一个稍微不同的名称来区分它,因此我们将其称为* EMI平均值*。
这是您需要用于这些标准的检测器。
EMC接收器中的* RMS Average *检测器是几年前添加到CISPR 16-1-1标准中的。
在这个时间点,世界各地的管理机构使用非常有限。
如果您对加速测量感兴趣,请使用峰值检测器进行扫描,并仅使用EMI平均值检测器(或您需要使用的任何EMC检测器)检测感兴趣的信号 - 接近极限的信号。
(信号列表和测量序列对此有利,因为标记功能单独测量)这是一种可接受的方式,因为任何信号的EMI平均值检测器值都不会大于峰值检测器测量的值。
最好的问候,迈克

以上来自于谷歌翻译


     以下为原文

  The nature of the beast is that EMI detectors are slow for scanning...

The average detector that EN 55015 specifies is what Agilent calls the *EMI Average* detector. Our spectrum analyzers have had an *Average* detector in them for many years, and they have had some enhancements over the years with different average types. But since the average detector that certain commercial EMC standards require is much different than the average detectors that our spectrum analyzers have had we needed to differentiate it by giving it a slightly different name, so we call it *EMI Average*. This is the detector that you need to use for these standards.

The *RMS Average* detector in an EMC receiver is something that was added to the CISPR 16-1-1 standard a few years ago. At this point in time this has very limited use by the governing bodies around the world.

If you are interested in speeding up your measurements use the peak detector for doing your scans and only use the EMI Average detector (or whatever EMC detector you need to use) for signals of interest - ones that come close to your limit. (The signal list and measure sequence is good for this, as is the Measure at Marker function by itself) This is an accepted way of doing this since the EMI Average detector values for any signal will never be greater than measured by the peak detector.

Best regards,
Mike
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