用電流探頭看

有規范嗎???
我要找到測試依據

我知道美軍標的測試方法.這個要分為輸入差模和輸入共模紋波電流.
用英語說.1.input differential-mode noise:              1)a voltage measurement is made across the input terminal of the terminal with a votage probe.The quantity measured is the input ripple current times the equivalent source impendance.If the source supply and the test setup never changed,the noise from different converters could be directly compared .But to measure the actual ripple current,the source impendances nust be known,and the source impendances depend on poorly controlled parameters of the components in the output of the source supply.At frequency above a megeherzs even palcement of the wires on the bench will make a significant difference in the measured results.Idea,a zero source impendance source could be used,the measured noise voltage always be zero,no matter how high the ripple current.                          2)The more accurate test result is can be obtained directly by the test current with a current probe.So the source impendance will  make little difference in the current measured.The effect of the Zs is further reduced by adding bypass capcitor Cb which should be a high quality unit with small series inductance and resistance over the frequency band of interest(usually the switching frequency and above).The connection wires from Cb to the converter should be as short as possible

有標準號嗎?先謝謝了,我找了好長時間啊!
能告訴我上段English的出處嗎!

已interpiont為例,好象在技術指標上沒分共模和差模電流
只有測試要求B.W.=10K to 10M, Lin=6uH條件.

barclay,I am WALLACE.
上面是差模的測試.

我QQ:86086137能聯系請教嗎?

2.Input common mode noise:500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/44/1155263290.jpg');}" onmousewheel="return imgzoom(this);">

6uH是1m并行線的電感;
帶寬是軍標要求的.
下面是美軍標461C的測試方法,依然是電流探頭測試:
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到了461D及以后的版本,就是要求LISN(LINE STABILIZATION NETEWORK'S)電源線平衡網絡,而不是電流探頭了.The LISN is a high pass filter for the measuring instrument 50ohm input resistance.The interference currents,within the measurement bandwidth,return through the 50 ohm resistor,such that  units of the measurement is dBuV,not dBuA.The MIL-STD-461D is offset by 34dB with respect to 461C.Below about 1.3Mhz,the 461C limit line is more lenient than that of 461D,while at higher frequencies the opposite is the case.For power converters designed to comply with 461C,a marginal to out of spec condition can be expected below 1.3M for conducted interference measurements made per MIl-std-461D.for example,the difference is about 12db at 500KHZ.Correcting this involves placing a ceramic or tantalum capcitors across the system input power line to work against the series line inductors.This shouldn't be any problem at the higher frequencies above 1.3Mhz CROSSOVER POINT.

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500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/44/1155535451.jpg');}" onmousewheel="return imgzoom(this);">

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/44/1155547577.jpg');}" onmousewheel="return imgzoom(this);">

學學好東西,謝謝

高手啊!
從資料上看來,測試方法用CE102電源線傳導發射．
那是<電磁發射和敏感度要求>