CXA 9000A缺少RF耦合DC？

并非所有CXA仪器都具有AC / DC耦合选择，只有具有选项513和526频率范围的仪器。
较低频率的仪器总是交流耦合到最小输入频率。如果其中一个手册中的某些内容令人困惑或误导，请告诉我们，以便我们更正。最好的问候，迈克



     以下为原文

  Not all CXA instruments have the AC/DC coupling selection, only the ones with the Option 513 and 526 frequency range. The lower frequency instruments are always AC coupled down to the minimum input frequency.

If there is something in one of the manuals that is either confusing or misleading please let us know so we can correct it.

Best regards,
Mike

谢谢你节省时间的答案。
（我的仪器的选项503频率范围为9kHz - 3GHz - 所以它将不断交流耦合）..这对某些EMC测量有何影响？
我指的是5990-3133EN，在第8页它说：“X系列应该处于直流耦合模式。”
请评论。** ps。
关于同一文档 - 它指出“选择限制，将文件类型更改为.Lim，并滚动到所需的限制线”。
我失去了宝贵的时间来调查为什么我没有* .lim文件，最终选择.csv文件是否会放入我感兴趣的正确限制。谢谢你的答案。编辑：yavkata于2013年5月21日1
：下午48点



     以下为原文

  Thank you for the timesaving answer. (My instrument is with Option 503 frequency range 9kHz - 3GHz - so it will be constantly AC coupled)..
How does this affect some EMC measurements? I am referring to  5990-3133EN , on p.8 it states that:" The X-Series should be in DC coupled mode." Please, comment.
**ps. Regarding the same document - it states "Select limits, change file type to .Lim, and scroll to the required limit line". I lost precious time investigating why I don't have *.lim files and eventually whether selecting .csv files will put the correct limits that I am interested in.
Thanks for the answers in advance.

Edited by: yavkata on May 21, 2013 1:48 PM

使用低至9 kHz交流耦合的CXA，你会很好。
其他X系列仪器在交流耦合时具有10 MHz的限制，但较低频率的CXA具有不同的输入耦合电路，因此它们的工作频率为9 kHz。
其他X系列仪器需要切换到直流耦合以进行这些低频测量。我们还切换到提供.csv文件格式的所有限制线文件，软件版本为A.10.00，当我们也更新它们时
在列表中添加更多新的。我会要求作者提交您提到的应用说明进行必要的更改以包含此信息。最好的问候，迈克



     以下为原文

  You'll be fine with your CXA down to 9 kHz AC coupled. The other X-Series instruments have a limitation of 10 MHz when AC coupled but the lower frequency CXAs have a different input coupling circuit, so they work dwon to 9 kHz. The other X-Series instruments need to switch to DC coupled to make these low frequency measurements.

We also switched over to providing all of the limit line files in .csv file format with software version A.10.00, when we also updated them all and adding many more new ones to the list.

I will ask the writers of the application note you mention to make the needed changes to include this information.

Best regards,
Mike