EMC
娴嬮噺鐨勫父鐢ㄨ閲忓崟浣嶅垎璐濓紙
dB
锛夊強鍏舵崲绠?/p>
鍒嗚礉锛?/p>
dB
锛夋槸娴嬮噺鐨勭墿鐞嗛噺涓庝綔涓烘瘮杈冪殑鍙傝�冪墿鐞嗛噺涔嬮棿鐨勬瘮鍊肩殑瀵规暟锛堜互
10
涓哄簳鐨勶級锛岀敤浠ヨ〃绀轰袱鑰呯殑鍊嶇巼鍏崇郴銆?/p>
涓�銆?/p>
EMC
娴嬮噺閲囩敤鍒嗚礉锛?/p>
dB
锛変綔璁￠噺鍗曚綅鐨勬剰涔?/p>
1
锛?/p>
鍒嗚礉锛?/p>
dB
锛夊叿鏈夊帇缂╂暟鎹殑鐗圭偣锛岀敤鍏惰閲忓彲浣挎祴閲忕殑绮剧‘鎬ф彁楂樸�?/p>
2
锛?/p>
鍒嗚礉锛?/p>
dB
锛夊叿鏈変娇鐗╃悊閲忎箣闂寸殑鎹㈢畻渚挎嵎鐨勭壒鐐癸紝浣胯緝澶嶆潅鐨勪箻闄ゅ強鏂瑰箓鐨勮繍
绠楀彉涓虹畝鍗曠殑鍔犲噺鍜屽鏁拌繍绠椼�?/p>
3
锛?/p>
鍒嗚礉锛?/p>
dB
锛変綔璁￠噺鍗曚綅鍏锋湁鍙嶆槧浜鸿�冲澹伴煶骞叉壈瀹為檯鍝嶅簲鐨勭壒鐐广�?/p>
浜屻�?/p>
EMC
娴嬮噺甯哥敤鍙傝�冮噺鍙婂叾娴嬮噺鍊煎垎璐濓紙
dB
锛夋暟鐨勮绠楀叕寮?/p>
(
娴嬮噺鍊奸噺绾插悓鍙?/p>
鑰冮噺閲忕翰
)
鐗╃悊閲?/p>
鍙傝�冮噺
鐩稿簲鐨勫垎璐濋噺
鍒嗚礉閲忕殑鍚?
绉?/p>
娴嬮噺鍊煎垎璐濇暟鐨勮绠楀叕寮?/p>
鐢靛帇
1渭V
0 dB渭V
寰紡鍒嗚礉
dB渭V=20lg
锛堟祴閲忓�?/p>
/1渭V
锛?/p>
鐢垫祦
1渭A
0 dB渭A
寰畨鍒嗚礉
dB渭A=20lg
锛堟祴閲忓�?/p>
/1渭A
锛?/p>
鐢靛満寮哄害
1渭V/m
0 dB渭V/m
寰紡
/
绫冲垎璐?/p>
dB渭V/m=20lg
锛堟祴閲忓�?/p>
/1渭V/m
锛?/p>
纾佸満寮哄害
1渭A/m
0 dB渭A/m
寰畨
/
绫冲垎璐?/p>
dB渭A=20lg
锛堟祴閲忓�?/p>
/1渭A/m
锛?/p>
杈愬皠鍔熺巼
1 pW
0 dBpW
鐨摝鍒嗚礉
dBpW =10lg
锛堟祴閲忓�?/p>
/1pW
锛?/p>
涓夈�?/p>
EMC
娴嬮噺涓殑鍚勫垎璐濓紙
dB
锛夊崟浣?/p>
(
閲?/p>
)
鐨勬崲绠?/p>
1.
鐢靛帇娴嬮噺鍊硷紙浼忥紝锛夌殑鍒嗚礉锛?/p>
dB
锛夊崟浣嶆崲绠?/p>
1
锛?/p>
dB
= 20lg
2
锛?/p>
dBm = 20lg
+ 60dBm
3
锛?/p>
dB渭 = 20lg+ 120dB渭
2.
鐢垫祦娴嬮噺鍊硷紙瀹夛紝
A
锛夌殑鍒嗚礉锛?/p>
dB
锛夊崟浣嶆崲绠?/p>
1)
dBA = 20lg
2
锛?/p>
dBmA = 20lg + 60dBmA
3
锛?/p>
dB渭A = 20lg + 120dB渭A