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. An object or a person can accumulate an electrostatic charge inside of a voltage higher than 15kv. Phihlelo e bonts’a hore liphoso le likotsi tse ngata tse sa hlalosoang li kanna tsa bakoa ke ESD. By discharging from the ESD simulator to the surface of and near the EUT, the test instrument (EUT) captures ESD activity. Boemo bo matla ba ho tsoa bo hlalositsoe ka ho hlaka maemong a sehlahisoa le meralo ea liteko tsa EMC e lokiselitsoeng ke moetsi. EUT checks for functional failures or interference in all of its operational modes. Mekhoa ea ho feta / ho hloleha e tlameha ho hlalosoa morerong oa liteko oa EMC mme e khethoe ke moetsi oa sehlahisoa.

PCB transient conductivity resistance

Morero oa mantlha oa teko ena ke ho netefatsa ho hanela ha EUT maemong a nakoana le a nako e khuts’oane ka nako e nyolohang e potlakileng e ka hlahisoang ke meroalo e mebe kapa li-contactor. Nako ea ho phahama ka potlako le sebopeho se pheta-phetoang sa sekhahla sena sa liteko se etsa hore li-spikes tsena li phunyeletse habonolo lipotoloho tsa EUT mme li ka sitisa ts’ebetso ea EUT. Linako tse sebetsang ka kotloloho phepelong ea motlakase le tumello ea mohala oa lets’oao. In other PCB immunity tests, the EUT should be monitored on a pass/fail basis using a general operation configuration.

Resistance of PCB to electromagnetic radiation

Morero oa mantlha oa teko ena ke ho netefatsa matla a sehlahisoa sa PCB a khahlanong le tšitiso khahlanong le li-radio, li-transceivers, mehala ea mehala ea GSM / AMPS, le libaka tse fapaneng tsa motlakase tse hlahisoang ke mehloli ea motlakase oa indasteri. Haeba sistimi e sa sirelelitsoe, mahlaseli a motlakase a ka hokahanngoa le thapo ea sehokelo mme a kenya potoloho ka tsela ea conduction; Kapa e ka hokahane ka kotloloho le wiring ea potoloho e hatisitsoeng. 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. Ha o fepa EUT lebaleng la radiation, EUT e tlameha ho hlophisoa ka mokhoa o tloaelehileng le ka mokhoa o bobebe ka ho fetesisa.

Ts’ebetso e tloaelehileng e tlameha ho theoa ka phapusing ea liteko ha EUT e pepesetsoa masimong a mekhahlelo a mekhahlelo eo maqhubu a eona a fetang 80MHz ho isa ho 1GHz frequency range. Some PCB anti-interference standards start at 27MHz. Boemo ba ho tiea tekanyetso ena hangata e hloka maemo a ho hanyetsa PCB a 1V / m, 3V / m, kapa 10V / m. Leha ho le joalo, litlhaloso tsa sesebelisoa li kanna tsa ba le litlhoko tsa tsona bakeng sa “frequency (interference” frequency “tse ikhethang). The appropriate PCB radiation resistance level of the product is of interest to the manufacturer.

Litlhokahalo tse kopaneng tsa tšimo Tekanyetso e ncha ea tšitiso ea PCB e EN50082-1: 1997 e bua ka IEC / EN61000-4-3. IEC / EN61000-4-3 e hloka tikoloho e kopaneng ea liteko e ipapisitse le mehlala ea liteko. 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. Sena se hlola liphoso tsa tlhatlhobo tse sa phetoang khafetsa le khafetsa tse bakiloeng ke ponaletso le mekhabiso ea tšimo likamoreng tsa setso tse sa buloang. (Kamore ea semi-anechoic le eona ke tikoloho e ntle ea ho metha tlhahiso ea radiation tikolohong e sa tloaelehang ea ka tlung e hlokang ho nepahala).

Ho aha likamore tsa semi-anechoic absorbers tsa RF ho tla hlophisoa maboteng le siling ea likamore tsa semi-anechoic. Mechini le litlhaloso tsa moralo oa RF li lokela ho amohela lithaelese tse boima tsa ferrite tse koahelang marulelo a kamore. Litene tsa Ferrite li lula holim’a thepa ea dielectric mme li manehiloe kaholimo ho kamore. Kamoreng e sa lekanyetsoang, lipontšo tse tsoang holim’a tšepe li tla baka maqhubu le maqhubu a emeng, a hlahisang litlhoro le lijelo molemong oa sebaka sa liteko. Tsela ea tšimo ka phapusing e sa lekanyetsoang e ka ba 20 ho isa ho 40dB, ‘me sena se tla etsa hore sampole ea liteko e bonahale e hloleha ka tšohanyetso lebaleng le tlase haholo. Phallo ea phaposi ea phapusi e fella ka ho pheta-pheta ho tlase ha liteko le “sekhahla”. (Sena se ka lebisa ho moralo o fetelletseng oa sehlahisoa.) Tekanyetso e ncha e khahlanong le tšitiso ea PCB IEC1000-4-3, e hlokang litlhoko tse tšoanang tsa tšimo, e lokisitse bofokoli bona bo tebileng.

Thepa ea software le software e hlokahalang ho hlahisa sebaka sa liteko li hloka seholisa-matla se phahameng sa motlakase RF ho khanna protepente e fetisang lenakana ka bongata ba makhetlo a fetang 26MHz ho 2GHz, e neng e le limithara tse 3 hole le sesebelisoa se neng se lekoa. 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. Lihakisi tsa software li lumella khokahano ea ho lekola le ho hlasimolla tšebetso ea EUT. Likarolo tse sebelisanang li a hlokahala tlhahlobong ea ‘nete ho nolofalletsa liphetoho tsa nako ea nnete ho software ea liteko tsa EMC le mekhahlelo ea EUT. Sesebelisoa sena sa phihlello sa mosebelisi se lumella hore lintlha tsohle li hatisoe kapele bakeng sa ho lekola le ho arola ts’ebetso ea EUT EMC.

Meetso ea li-pyramidal Mefuta e tloahelehileng ea li-pyramidal (conical) e sebetsa hantle, leha ho le joalo boholo ba piramite bo etsa hore ho be thata ho leka libaka tse nyane tse ka sebelisoang ka phapusing. Bakeng sa maqhubu a tlase a 80MHz, bolelele ba phallo ea phiramiti bo lokela ho fokotsoa ho 100cm, mme ho sebetsa maemong a tlase a 26MHz, bolelele ba phallo ea piramite bo lokela ho ba kholo ho feta 2m. Lisebelisoa tsa piramidi le tsona li na le mathata. Li senyeha habonolo, li senyeha habonolo ke ho thulana, ‘me lia chesa. Hape ha ho na thuso ho sebelisa li-absorber tsena fatše ka kamoreng. Ka lebaka la ho futhumala ha piramite, matla a tšimo a fetang 200V / m ka nako e telele a tla beha kotsi e kholo ea mollo.

Moferefere oa lithaelese tsa Ferrite

Lithaele tsa ferrite li sebetsa hantle tikolohong, leha ho le joalo li eketsa boima ba ‘ona marulelong, maboteng le mamating a kamore, ka hona sebopeho sa mochini sa kamore se bohlokoa haholo. Li sebetsa hantle maemong a tlase, empa ha li sebetse hantle ho maqhubu a fetang 1GHz. Lithaele tsa Ferrite li teteane haholo (100mm × 100mm × 6mm botenya) ‘me li ka mamella matla a tšimo ho feta 1000V / m ntle le kotsi ea mollo.

Mathata a liteko tsa PCB tsa ho hanyetsa mahlaseli a kotsi Hobane thepa e thusang e sebelisang EUT e fana ka matšoao a hlasimollang ho lekola tšebetso ea eona, e tlameha hore ka boeona e hanele PCB lebaleng lena le hlokolosi, e leng bothata ba tlholeho ba ho etsa tlhahlobo ea kutlo ea radiation. Hangata hona ho lebisa mathateng, haholoholo ha thepa e thusang e le thata mme e hloka mehala e mengata le likhokahano tse eang ho EUT tse pentiloeng ka phapusing ea liteko e sirelelitsoeng. Likhoele tsohle tse kenang ka phapusing ea liteko li tlameha ho sireletsoa le / kapa ho tlhotliloeng e le hore tšimo ea liteko e sirelletsoe ho bona ho qoba ho fokotsa ts’ebetso ea tšireletso ea kamore ea liteko. Compromises in the shielding performance of the test room will result in inadvertent leakage of the test site into the surrounding environment, which may cause interference to users of the spectrum. Hase kamehla ho ka khonehang ho sebelisa li-filters tsa RF bakeng sa lintlha kapa melaetsa ea melaetsa, joalo ka ha ho na le boitsebiso bo bongata kapa ha li-link tsa data tse lebelo li sebelisoa.