Line Impedance Stabilization Network

A line impedance stabilization network (LISN) is a device used in conducted and radiated radio-frequency emission and susceptibility tests, as specified in various electromagnetic compatibility (EMC)/EMI test standards (e.g., by CISPR, International Electrotechnical Commission, CENELEC, U.S. Federal Communications Commission, MIL-STD, DO-160 Sections 20-21-22).

LISN bụ ihe nzacha dị ala na-edobe n'etiti isi iyi ike AC ma ọ bụ DC yana EUT (ngwaọrụ n'okpuru ule) iji mepụta ihe mgbochi ama ama yana iji nye ọdụ ụgbọ mmiri ụda mkpọtụ redio (RF)..  na-ekewapụkwa mgbaàmà RF na-achọghị site na isi iyi ike.  Na mgbakwunye, enwere ike iji LISN were buo amụma e mere maka nchoputa na nnwale nnabata
áká_ịkẹngạ|thumb|Ihe osise LISN. Nke a bụ ihe osise ọkọlọtọ nke LISN nkịtị. Ọnụ ọgụgụ akụkụ maka otu ọkọlọtọ (MIL-STD 461): C1=8μF, R1=5Ω, C2=250nF, R2=1kΩ
áká_ịkẹngạ|thumb|Foto na-egosi ọkọlọtọ LISN na mkpuchi elu

 Ọrụ nke LISN 

 Ihe mgbochi nke eriri kwụsiri ike 
Isi ọrụ nke LISN bụ inye ezigbo mgbochi na ntinye ike nke EUT, iji nweta nlegharị anya nke mkpọtụ EUT dị na ọdụ ụgbọ mmiri LISN.  Nke a dị mkpa n'ihi na mgbochi nke isi iyi ike na mgbochi nke EUT na-arụ ọrụ nke ọma dị ka nkesa voltaji.  Ihe mgbochi nke isi iyi ike dịgasị iche, dabere na geometry nke wiwi ọkọnọ n'azụ yai. 

Induction a na-atụ anya ya nke eriri ike maka ntinye EUT na-arụkwa ọrụ n'ịchọpụta ụdị LISN ziri ezi dị mkpa maka nnwale.  ọmụmaatụ, njikọ dị n'ime ụlọ ga-ejikarị inductor 50 μH, ebe na ụkpụrụ nyocha ụgbọala, a na-eji inductor 5 μH eme ihe iji ṅomie ogologo waya dị mkpirikpi.

 Ịchụpụ mkpọtụ isi iyi ike 
Ọrụ ọzọ dị mkpa nke LISN bụ igbochi mkpọtụ dị elu nke isi iyi ike site na njikọta na usoro ahụ. LISN -arụ ọrụ dị ka nzacha dị ala, nke na-enye nnukwu ihe mgbochi na mkpọtụ RF dị n'èzí ka ọ na-enye ohere ka ike dị ala na-agafe na EUT.

 Njikọ dị nchebe nke ngwá ọrụ nlele 
Dị ka ọ na-adịkarị, a na-eji ihe nyocha spectrum ma ọ bụ onye na-anabata EMI iji tụọ ihe n'oge ule EMC. Ebe ntinye nke ngwá ọrụ dị otú ahụ dị oke egwu ma nwee ike imebi ma ọ bụrụ na ọ karịrị akarị. LISN -enye ọdụ ụgbọ mmiri na-atụle, na-abụkarị, 50 Ω mmepụta impedance. Ihe mgbochi  kwụsiri ike, ọrụ nzacha dị ala, na njirimara DC nke ọdụ ụgbọ mmiri LISN na-eme ka ọ dị mfe ijikọta mgbaàmà mkpọtụ dị elu na ntinye nke ngwá ọrụ na-atụle.

 Ụdị LISN 
N'okpuru otu ọkọlọtọ ule EMC, a chọrọ ụdị LISN a kapịrị ọnụ maka ịtụle na ịkọwa ọrụ EUT.

Ụdị dị iche iche nke LISNs dị maka nyochaa njikọ DC, otu-phase ma ọ bụ 3-phase AC. Isi ihe maka ịhọrọ ụdị LISN kwesịrị ekwesị  impedance, ntinye ọnwụ, ọkwa voltaji, ọkwa ugbu a, ọnụ ọgụgụ nke ndị na-eduzi ike na ụdị njikọ. Ogologo oge dị elu nke LISN na-arụkwa ọrụ dị mkpa mgbe a na-eji nyocha ikuku eme ihe maka ịkọ nsogbu ikuku. -eji LISN 100 MHz mee ihe n'ọnọdụ ndị ahụ. 

 Ihe edeturu 

 Edensibia 

 Ebe e si nweta ya 

 MIL-STD 461E, REQUIREMENTS maka CONTROL nke Electro-Magnets Interference CHARACTERISTICS nke SUBSYSTEMS na EQUIPMENT, 1999