EMI测试仪器的如何校准才能准确无误

jxwyzg

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引用第9楼kamleung于2011-03-30 15:29发表的  :
As you are using the same test receiver as TUV, your equipment is reliable.

In fact,  I just follow the ITS-HK method. ITS-HK is using the built-in feature of test receiver.  This feature is named as "Automatic Final Measurement with Threshold Scan" in the operating manual. The test receiver will have a fast prescan. If the measured level exceeds a limit line, or violates a margin defined for this line, the final measurement is performed. Hence, the number of readings is depending on the setting of margin. By using the equipment built-in feature, I have never used the R&S EMC32 Test software.

The cabling of the conical housing also affects the data. Hence, you may check your test setup against with the requirements in EN55015. For details, pls read my attachment.
.......

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     了解了。。
7 h( {+ X& U  L# w: z      还有一个问题，如果我想实验室内部自校仪器的话：是采取仪器说明书上的自校方法，还是自己准备好一个样品作为定标的准值呢？

kamleung

You are correct that the R&S test receiver provides a self-calibration function. Normally, I will perform the self-calibration before making any measurements. So far as I know, ITS-HK even uses an independent calibrator to generate the stable signals for checking his test receiver daily.

It is a good idea to keep a reference sample for checking your equipment. As a reference, the sample has better getting the stable data which is not affecting by time or temperature. However, the energy saving lamp seems not a good sample to give you a stable reference.

jxwyzg

引用第11楼kamleung于2011-03-31 13:18发表的  :
: k/ y& T& A& r; q7 `$ i: i& L! m( gYou are correct that the R&S test receiver provides a self-calibration function. Normally, I will perform the self-calibration before making any measurements. So far as I know, ITS-HK even uses an independent calibrator to generate the stable signals for checking his test receiver daily.
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It is a good idea to keep a reference sample for checking your equipment. As a reference, the sample has better getting the stable data which is not affecting by time or temperature. However, the energy saving lamp seems not a good sample to give you a stable reference.

      因为每天开机前，我都会按照说明书上的方法自校一次，确保准度。
  然而你说的，节能灯不是很好的一个参考定标样品。我想请教你一下，用什么样的产品可以替代它来作为一个准确的定标样品。（我们公司是做灯具控制器以及灯具的）你能否给我一个建议？   
                                           谢谢！

kamleung

I use two different types of reference to check the test receiver :
8 a7 z% U6 h; |7 `* n   1) the bulit-in tracking generator of the test receiver
9 c! N% j( [, Z' n) l2 p4 c   2) a switching adaptor with the rated resisitive load
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( L- ~6 e% x. j( |8 S/ {If the abnormal data is found, I even use the sine waves of a calibrated signal generator to check the test receiver.

jxwyzg

我还没有用过您这样的校准方法。
. D( o% t6 ^2 F能否说说你的操作流程。
' j, c- Z9 t* L8 @   期待！！！

kamleung

It is sorry that the procedures cannot be opened because they are the controlled documents in my company. In fact, the reference is just used as the in-service check for the whole test setup. If there are something wrong in cabling, grouding, LISN and test receiver, then different test results will be obtained. Hence, you may feel free to select any reliable and stable source as your reference.
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About the equipment calibration, the R&S test receiver already provides you the built-in self-alignment. Whenever you are performing the "CAL TOTAL", the equipment will automatically use its internal calibration signal source to have the self-alignment. For the details of this calibration feature, you may read your on-hand operating manual.

jxwyzg

“CAL TOTAL”这个功能，我一直在用。。
0 v' L* {6 A  U4 ^    有点遗憾的就是没有学到你所说的操作方法，，，
     不过还是有些收获。
      非常感谢你!

zico863

学习了。
谢谢！