The main purpose of this test is to verify the resistance to electrostatic discharge (ESD) caused by the proximity or contact of an object or person or device. Ib yam khoom lossis tib neeg tuaj yeem khaws tus nqi hluav taws xob sab hauv ntawm qhov hluav taws xob siab dua 15kv. Kev paub qhia pom tias ntau yam ua tsis tiav thiab puas tsuaj yog qhov tshwm sim los ntawm ESD. Los ntawm kev tshem tawm ntawm ESD tus qauv mus rau saum npoo thiab ze rau EUT, qhov ntsuas ntsuas (EUT) ntes ESD cov haujlwm. Qhov hnyav ntawm kev tso tawm tau piav qhia meej hauv cov qauv khoom thiab EMC cov phiaj xwm kev npaj npaj los ntawm cov khw. EUT checks for functional failures or interference in all of its operational modes. Kev xeem dhau/ua tsis tiav yuav tsum tau hais hauv EMC daim phiaj sim thiab txiav txim siab los ntawm cov tuam txhab tsim khoom.

PCB transient conductivity resistance

Lub hom phiaj tseem ceeb ntawm qhov kev ntsuas no yog txhawm rau txheeb xyuas qhov tsis kam ntawm EUT mus rau qhov hloov pauv nyob rau lub sijhawm luv thiab luv nrog lub sijhawm nce sai uas tuaj yeem tsim los ntawm cov khoom siv inductive lossis cov neeg tiv tauj. Lub sijhawm nce sai thiab qhov xwm txheej rov ua dua ntawm qhov kev ntsuas plawv no ua rau cov spikes yooj yim nkag mus rau EUT cov kab hluav taws xob thiab muaj peev xwm cuam tshuam nrog EUT kev ua haujlwm. Cov neeg kis tau ncaj qha rau lub hwj chim tseem ceeb thiab kev tso cai ntawm kab teeb liab. Hauv lwm qhov kev ntsuam xyuas PCB tiv thaiv kab mob, EUT yuav tsum tau saib xyuas ntawm qhov dhau/tsis ua raws siv kev teeb tsa dav dav.

Resistance of PCB to electromagnetic radiation

Lub hom phiaj tseem ceeb ntawm qhov kev sim no yog txhawm rau txheeb xyuas cov khoom PCB tiv thaiv kev cuam tshuam lub peev xwm tiv thaiv xov tooj cua, xa xov, xov tooj ntawm tes GSM/AMPS, thiab ntau yam kev siv hluav taws xob tau tsim los ntawm cov khoom siv hluav taws xob. Yog tias lub kaw lus tsis tiv thaiv, hluav taws xob hluav taws xob tuaj yeem txuas ua ke rau lub xov tooj sib txuas thiab nkag mus rau hauv Circuit Court los ntawm txoj kev coj ua; Los yog nws tuaj yeem txuas ncaj qha mus rau qhov thaiv ntawm cov ntawv luam tawm. When the amplitude of the rf electromagnetic field is large enough, the induced voltage and demodulated carrier can affect the normal operation of the device.

PCB radiation resistance Test run This test run is usually the longest and most difficult, requiring very expensive equipment and considerable experience. In contrast to other PCB immunity tests, success/failure criteria defined by the manufacturer and a written test plan must be sent to the test room. Thaum pub EUT rau hauv thaj chaw hluav taws xob, EUT yuav tsum tau teeb tsa hauv kev ua haujlwm ib txwm muaj thiab hom rhiab tshaj plaws.

Kev ua haujlwm ib txwm yuav tsum tau tsim nyob hauv chav kuaj thaum EUT raug rau qib cuam tshuam cuam tshuam cov teb uas nws qhov ntau tshaj qhov xav tau 80MHz txog 1GHz ntau zaus. Some PCB anti-interference standards start at 27MHz. Cov qib hnyav tus txheej txheem no feem ntau xav tau PCB qib tsis kam ntawm 1V/m, 3V/m, lossis 10V/m. Txawm li cas los xij, cov cuab yeej tshwj xeeb yuav muaj lawv tus kheej xav tau tshwj xeeb rau “teeb ​​meem (cuam tshuam) zaus”. The appropriate PCB radiation resistance level of the product is of interest to the manufacturer.

Kev sib koom ua ke cov kev xav tau PCB tshiab cuam tshuam kev cuam tshuam tus qauv EN50082-1: 1997 hais txog IEC/EN61000-4-3. IEC/EN61000-4-3 xav tau ib puag ncig kev sim ua ke raws li cov qauv ntsuas The test environment was realized in an anechoic room with tiles arranged with ferrite absorbers to block reflection and resonance in order to establish a unified test site indoors. Qhov no kov yeej qhov tshwm sim sai thiab tsis rov ua dua uas tshwm sim los ntawm kev rov xav dua thiab kev ua haujlwm sib luag hauv chav ib txwm tsis muaj kab. (Ib chav ib nrab anechoic kuj yog ib puag ncig zoo tshaj plaws rau ntsuas hluav taws xob tawm hauv ib puag ncig txawv txav sab hauv tsev uas xav tau qhov tseeb).

Kev tsim kho cov chav ib nrab-anechoic RF nqus dej yuav tsum tau teeb tsa ntawm phab ntsa thiab qab nthab ntawm chav ib nrab-anechoic. Cov kws kho tshuab thiab cov qauv tsim tshwj xeeb yuav tsum ua kom cov vuas luaj ferrite hnyav hauv qab ru tsev ntawm chav. Ferrite cib zaum ntawm cov khoom siv dielectric thiab txuas rau saum toj ntawm chav. Hauv chav uas tsis tau teeb tsa, kev xav los ntawm cov hlau saum npoo yuav ua rau muaj suab nrov thiab sawv nthwv dej, uas tsim kom muaj qhov siab thiab nqaj hauv lub zog ntawm qhov chaw ntsuas. Cov teb gradient hauv chav ib txwm tsis tau teeb tsa tuaj yeem yog 20 txog 40dB, thiab qhov no yuav ua rau cov qauv ntsuas pom tshwm sim sai sai hauv qhov chaw qis heev. Cov resonance ntawm chav tsev ua rau muaj kev sim qis dua qhov ua tau zoo thiab qhov siab ntawm “hla dhau”. (Qhov no yuav ua rau dhau qhov tsim qauv ntawm cov khoom.) Tus qauv tshiab PCB tiv thaiv kev cuam tshuam tus qauv IEC1000-4-3, uas yuav tsum tau ua tib yam kev xav tau hauv cheeb tsam, tau kho qhov tsis zoo no.

Kho vajtse thiab software xav tau los tsim qhov chaw ntsuas xav tau lub zog loj broadband RF amplifier los tsav lub dav hlau xa xov kav hlau txais xov hauv qhov ntau ntawm ntau dua 26MHz txog 2GHz, uas yog 3 meters deb ntawm lub cuab yeej raug sim. Fully automated testing and calibration under software control provides greater flexibility for testing and full control of all key parameters such as scan rate, frequency pause time, modulation and field strength. Kev sib txuas software tso cai rau synchronization ntawm kev saib xyuas thiab txhawb kev ua haujlwm ntawm EUT. Cov yam ntxwv sib tham yog xav tau hauv kev sim tiag tiag txhawm rau hloov pauv lub sijhawm tiag tiag hauv EMC kuaj software thiab EUT tsis ntsuas. Qhov kev siv tus neeg siv no tso cai rau txhua cov ntaub ntawv raug kaw sai rau kev tshuaj xyuas tau zoo thiab muab faib rau EUT EMC kev ua tau zoo.

Pyramidal absorbers Tsoos pyramidal (conical) nqus tau zoo, txawm li cas los xij qhov loj ntawm lub hauv paus ua rau nws tsis tuaj yeem sim qhov me me siv tau qhov chaw hauv ib chav. Rau qhov qis dua ntawm 80MHz, qhov ntev ntawm lub hauv paus nqus yuav tsum tau txo mus rau 100cm, thiab kom ua haujlwm qis dua ntawm 26MHz, qhov ntev ntawm lub hauv paus nqus yuav tsum ntau dua 2m. Pyramid absorbers kuj muaj qhov tsis zoo. Lawv yog cov tsis muaj zog, yooj yim puas los ntawm kev sib tsoo, thiab flammable. Nws kuj tseem tsis siv tau los siv cov nqus dej hauv pem teb ntawm chav. Vim tias cua sov ntawm lub tshuab nqus pa, lub zog muaj zog ntau dua 200V/m nyob rau lub sijhawm yuav ua rau muaj kev pheej hmoo loj ntawm hluav taws.

Ferrite nplais absorber

Cov vuas luaj ferrite tau ua haujlwm tau zoo, txawm li cas los xij lawv ntxiv qhov hnyav rau lub ru tsev, phab ntsa thiab qhov rooj ntawm chav, yog li cov qauv siv tshuab ntawm chav ua haujlwm tseem ceeb heev. Lawv ua haujlwm tau zoo ntawm qhov tsawg zaus, tab sis dhau los ua qhov tsis muaj txiaj ntsig ntawm zaus ntau dua 1GHz. Cov vuas luaj ferrite tau ntom heev (100mm × 100mm × 6mm tuab) thiab tuaj yeem tiv taus qhov hnyav ntau dua 1000V/m yam tsis muaj kev phom sij.

Nyuaj nyuaj hauv PCB kev tshuaj ntsuam hluav taws xob tiv taus Vim tias cov cuab yeej pabcuam siv los ua haujlwm EUT muab cov cim ntsuas los saib xyuas nws tus kheej kev ua haujlwm, nws yuav tsum yog tus PCB-tiv taus rau qhov kev nkag siab no, uas yog qhov nyuaj hauv kev khiav hluav taws xob ntsuas qhov ntsuas. Qhov no feem ntau ua rau muaj teeb meem, tshwj xeeb tshaj yog thaum cov cuab yeej pabcuam nyuaj thiab xav tau ntau lub xov tooj thiab cuam tshuam rau EUT uas tau tawg los ntawm chav thaiv. Txhua lub xovtooj uas hla dhau chav kuaj yuav tsum tau thaiv thiab/lossis lim tawm kom lub chaw ntsuas ntsuas raug thaiv los ntawm lawv kom tsis txhob txo qhov kev tiv thaiv ntawm chav kuaj. Kev sib cav hauv kev tiv thaiv qhov ua tau zoo ntawm chav xeem yuav ua rau muaj qhov tsis raug los ntawm qhov chaw xeem mus rau ib puag ncig ib puag ncig, uas tuaj yeem ua rau cuam tshuam rau cov neeg siv ntawm lub ntsej muag. Nws tsis yog ib txwm ua tau los siv RF lim dej rau cov ntaub ntawv lossis kab cim, xws li thaum muaj cov ntaub ntawv ntau lossis thaum siv cov ntaub ntawv sib txuas ceev.