Siji, tes listrik

PCB in the process of production, hard to avoid the short circuit, open circuit and leakage caused by external factors, such as electrical flaws, coupled with the continuous toward high density PCB, fine spacing and the evolution of multi-level, and failure to timely to bad plate screening out, and let it flow into the process, is bound to cause waste more cost, so in addition to the improvement of the process control, Teknik tes sing ditambahake uga bisa menehi solusi kanggo pabrikan PCB kanggo nyuda tarif kethokan lan ningkatake asil produk.

Ing proses produksi produk elektronik, kerugian sing disebabake amarga cacat duwe derajat sing beda-beda ing saben tahapan, lan luwih dhisik ditemokake, saya murah biaya remediasi. Aturan 10 “umume digunakake kanggo ngramal Biaya remediasi nalika PCB ditemokake cacat ing macem-macem tahapan proses kasebut. Contone, sawise rampung produksi piring kosong, yen papan ing sirkuit bisa dideteksi kanthi wektu nyata, biasane mung kudu ndandani cacat, utawa paling ora bakal ilang piring kosong; Nanging, yen sirkuit ora dideteksi, papan dikirim menyang assembler hilir kanggo ngrampungake instalasi bagean, lan tungku tungku lan remelting IR, nanging sirkuit kasebut dideteksi ing wektu iki, assembler hilir umum bakal takon karo perusahaan manufaktur papan kosong kanggo menehi ganti rugi kanggo bagean, biaya industri abot, ragad inspeksi, lsp. Yen luwih apes, papan sing rusak isih durung ditemokake ing tes industri perakitan, nanging dadi sistem produk rampung, kayata komputer, ponsel, suku cadhangan mobil, lan sapanunggalane, mula tes kanggo nemokake kapitunan kasebut bakal dadi papan kosong deteksi tepat waktu kaping satus, kaping ewu, utawa malah luwih dhuwur. Mangkono, tes listrik kanggo pabrikan PCB yaiku babagan deteksi dini papan sing rusak.

The downstream operator usually requires the PCB manufacturer to perform 100 percent electrical testing and therefore agrees with the PCB manufacturer on specifications for testing conditions and methods, so both parties will first clearly define the following:

1. Test data source and format

2, kahanan tes, kayata voltase, arus, isolasi lan konektivitas

3. Cara produksi lan pilihan peralatan

4. Babagan tes

5, repair specifications

Ana telung tahap ing manufaktur PCB sing kudu dites:

1. After etching the inner layer

2. Sawise etching sirkuit njaba

3, produk rampung

Saben tahap biasane bakal duwe tes uji coba 2 ~ 3 kaping 100%, uculake piring sing ora apik kanggo proses sing abot. Therefore, the test station is also the best data collection source to analyze the process problem points. According to the statistical results, you can obtain the percentage of open circuit, short circuit and other insulation problems, and then test after reengineering. After sorting out the data, use the quality control method to find out the root of the problem and solve it.

Loro, metode pangukuran listrik lan peralatan

Cara tes listrik kalebu: Khusus, Universal Grid, Fbe Probe, e-beam, kain konduktif, Kapasitas lan ATG-scan MAN minangka telung piranti sing paling umum digunakake. They are special test machine, general test machine and flying needle test machine. In order to better understand the functions of each device, the features of the three major devices are compared below.

1. Dedicated testing

Fixtures (such as the pins and dials used to test circuit boards) only work with one material number. Boards with different material numbers cannot be tested and recycled. Ing babagan poin tes, panel siji bisa dites udakara 10,240 poin, lan loro-lorone ana 8,192 poin. Ing babagan kerapatan test, amarga kandel endhas probe, luwih cocog kanggo papan ing sadhuwure nada.

2. Universal Grid testing

Prinsip dhasar tes panggunaan umum yaiku tata letak sirkuit PCB dirancang miturut Grid. Umume, kepadatan garis sing diarani nuduhake jarak Grid, sing ditulis dening Pitch (kadang uga bisa ditulis kanthi kerapatan bolongan), lan tes panggunaan umum adhedhasar prinsip iki. Miturut posisi bolongan, substrat G10 digunakake minangka Topeng. Mung ing posisi bolongan, probe bisa ngliwati Topeng kanggo pangukuran listrik, saengga pabrik perlengkapane gampang lan cepet, lan probe bisa digunakake maneh. Baki jarum gedhe tetep standar kanthi akeh ukuran bisa digunakake kanggo ngasilake tray jarum probe sing bisa dipindhah miturut nomer bahan sing beda-beda. Sajrone nampan jarum sing bisa dipindhah diganti sajrone produksi massal, bisa digunakake kanggo tes produksi massal kanthi macem-macem nomer bahan. Kajaba iku, kanggo mesthekake sistem sirkuit papan PCB sing wis rampung ora ana alangan, kudu mbukak tes listrik Open / Short ing papan kanthi piring jarum saka titik kontak tartamtu ing mesin ukur listrik kanthi tujuan umum kanthi voltase dhuwur ( kayata 250V) poin multi-ukuran. Mesin TesTIng universal iki diarani “AutomaTIc TesTIng Equipment” (ATE).

Titik tes panggunaan biasane luwih saka 10,000 poin, lan kepadatan tes diarani tes ing kothak. Yen digunakake ing papan kapadhetan dhuwur, jarak kasebut cedhak banget, lan wis dipisahake karo desain on-grid, mula kalebu tes off-grid, lan perlengkapan kasebut kudu dirancang khusus. Kapadhetan tes tes umum bisa tekan QFP.

3. Tes Probe Flying

Prinsip tes jarum mabur iku gampang banget. Mung rong probe sing dibutuhake kanggo mindhah x, y lan Z kanggo nyoba loro ujung saben baris siji-siji, mula ora prelu nggawe peralatan liyane sing larang. Nanging, amarga tes endpoint, kacepetan pangukuran alon banget, udakara 10 ~ 40 poin / SEC, mula cocog kanggo conto lan produksi volume cilik; Ing babagan kerapatan tes, tes jarum mabur bisa ditrapake ing piring kepadatan sing dhuwur banget (), kayata MCM.