Yuav ua li cas kom paub tseeb tias lub diode yuav yog tiag?

Ib, Kev tshuaj xyuas qhov tshwm sim: qhov yooj yim tab sis tseem ceeb thawj kab ntawm kev tiv thaiv
1. Kev txheeb xyuas thiab kev ntim khoom pov thawj
Cov diodes qhabnias feem ntau yog sau nrog cov lus qhia meej thiab cov qauv qauv ntawm lub casing lossis ntim. Piv txwv li, domestic diodes feem ntau muaj cov cim Circuit Court luam tawm ntawm lub casing, ncaj qha qhia lub polarity ntawm tus pins; Ntshuam hom xws li 1N4007 rectifier diodes yuav tsum muaj lawv cov qauv qhia tag nrho raws li tus thawj Hoobkas cov ntaub ntawv phau ntawv. Yog tias qhov kev txheeb xyuas qhov muag tsis pom, qhov font yog ntxhib, lossis muaj kev sau yuam kev, ceeb toom rau cov khoom siv kho dua tshiab lossis cov khoom cuav.

Hais txog kev ntim khoom, cov khoom tiag feem ntau yog ntim rau hauv cov khoom siv los tiv thaiv - lub hnab zoo li qub lossis cov tais tshwj xeeb, thiab tuaj nrog cov ntawv tseem ceeb ntawm lub Hoobkas uas suav nrog cov lej batch, hnub tsim khoom, daim ntawv lo ib puag ncig, thiab lwm yam ntaub ntawv. Piv txwv li, hauv qee qhov kev yuav khoom, ib qho khoom cuav 1N5819 Schottky diode tau ntim rau hauv lub hnab yas tsis tu ncua thiab tsis dais ib puag ncig RoHS cim. Qhov tsis txaus ntseeg tau pom thaum kawg los ntawm kev sib piv cov khoom ntim thawj.

2. Pin thiab plhaub tshuab
Tiag tiag diode pins feem ntau yog kho nrog tin plating, nrog ib tug du thiab oxidation dawb nto, zoo ib yam pin ntev, thiab tsis muaj dabtsi yog khoov los yog deformation. Piv txwv li, qhov ntev ntawm qhov kawg ntawm tus pin tiag LED yog tus ncej zoo, thiab lub hauv paus ntawm tus pin tsis corroded; Cov khoom cuav tej zaum yuav muaj cov pins dub los yog tawg yooj yim vim yog siv cov hlau tsis zoo.

Nyob rau hauv cov nqe lus ntawm lub plhaub technology, lub plhaub tiag tiag cov khoom yog ib yam, tsis muaj kab nrib pleb, npuas los yog deformation. Piv txwv li, nyob rau hauv ib qho xwm txheej, tus cuav M7 rectifier diode casing yog ua los ntawm cov yas siv dua tshiab, nrog rau qhov ntxhib saum npoo thiab xim sib txawv, ua kom pom qhov sib txawv ntawm qhov qub dub epoxy resin casing.

3. Kev lees paub tshwj xeeb
Qee lub diodes tau cim nrog polarity los ntawm cov xim nplhaib, xim dots, lossis grooves. Piv txwv li:

Xim lub nplhaib cim: Zener diodes feem ntau cim nrog lub nplhaib xim ze ntawm tus pin tsis zoo. Cov xim tiag tiag muaj cov xim tsis sib xws thiab txoj haujlwm meej; Cov khoom cuav yuav muaj xim nplhaib sib txawv los yog xim plooj vim cov txheej txheem tsis raug.
Groove marking: Qhov tseeb siab - zaus kuj sib txawv ntawm cov diodes feem ntau muaj qhov zawj ntawm qhov tsis zoo tus pin sab, thaum cov khoom cuav yuav tshem tawm cov cim no lossis muaj qhov tob tsis txaus.
2, Kev ntsuas hluav taws xob ua haujlwm: cov ntsiab lus tseem ceeb ntawm kev txheeb xyuas qhov ntau
1. Unidirectional conductivity xeem
Siv ib lub multimeter (pointer los yog digital) los ntsuas lub pem hauv ntej thiab thim rov qab tsis kam ntawm diode yog qhov tseem ceeb rau kev txheeb xyuas nws cov unidirectional conductivity

Pointer multimeter: muab tso rau hauv R × 1k Ω ntau, qhov kev tiv thaiv pem hauv ntej yuav tsum yog ob peb puas ohms mus rau ntau txhiab ohms, thiab qhov rov qab ua haujlwm yuav tsum nyob ze rau qhov tsis muaj tseeb. Piv txwv li, qhov kev tiv thaiv rau pem hauv ntej ntawm qhov tseeb 1N4148 hloov diode yog hais txog 600 Ω, thiab qhov rov qab tsis kam yog ntau dua 1M Ω; Yog tias qhov kev tawm tsam rau pem hauv ntej thiab rov qab yog ob qho tib si ze rau 0 lossis tsis kawg, nws yuav yog qhov tawg lossis qhib Circuit Court.
Digital multimeter: siv lub diode tshwj xeeb iav, lub zog rau pem hauv ntej poob yuav tsum yog 0.2-0.7V (silicon raj txog 0.6V, germanium raj txog 0.2V), thiab cov duab rov qab yuav tsum qhia "OL" lossis "1". Piv txwv li, nyob rau hauv ib qho xwm txheej, qhov kev poob qis rau pem hauv ntej ntawm ib qho khoom cuav BAS16 high-frequency diode mus txog 1.2V, deb tshaj qhov qub, nthuav tawm cov khoom siv doping tsis xws luag.
2. Voltage regulator value test (rau voltage regulator diodes)
Lub voltage regulator diode yuav tsum tau xyuas kom meej rau nws cov kev cai voltage kev ua tau zoo los ntawm kev siv ib tug sab nraud bias voltage:

Kev sim txoj kev: Tsim ib lub voj voog, txuas lub voltage regulator diode nyob rau hauv series nrog ib tug adjustable DC fais fab mov thiab ib tug tam sim no limiting resistor, thiab ntsuas qhov voltage ntawm ob qho tag nrho nrog ib tug multimeter. Piv txwv li, thaum lub input voltage ntau dua 3.6V, qhov tso zis voltage ntawm ib tug tiag tiag 3.6V voltage regulator diode (xws li RD3.6E) yuav tsum ruaj khov nyob rau hauv qhov ntau ntawm 3.47-3.83V; Yog tias qhov tso zis hluav taws xob hloov pauv ntau dua 5% lossis tsis tuaj yeem ncav cuag tus nqi nominal, nws yuav yog cov khoom cuav lossis cov khoom tsis zoo.
3. Hloov cov yam ntxwv kuaj (rau siab - zaus diodes)
High zaus diodes (xws li 1N4148, BAS16) yuav tsum xyuas seb lawv lub sijhawm rov qab los (trr) ua tau raws li cov lus qhia:

Cov khoom siv kuaj: Siv lub oscilloscope ua ke nrog lub tshuab hluav taws xob mem tes los ntsuas lub sijhawm hloov pauv ntawm lub diode los ntawm kev xa mus rau kev thim rov qab. Piv txwv li, TRR ntawm tiag 1N4148 yuav tsum tsawg dua 8ns. Yog tias qhov ntsuas tus nqi ntau dua 20ns, nws yuav yog ib qho qis - zaus diode impersonating ib qho khoom siab - zaus.
3, Kev Tshawb Fawb Cov Khoom Siv: Cov Txheej Txheem Txheej Txheem rau Kev Ua Haujlwm Zoo
1. X-ray fluorescence spectroscopy (XRF) tsom xam
Siv cov cuab yeej XRF txhawm rau txheeb xyuas cov hlau muaj pes tsawg leeg ntawm diode pins thiab chips, thiab xyuas seb lawv puas ua tau raws li lub Hoobkas tshwj xeeb. Piv txwv li:

Pin muaj pes tsawg leeg: Tiag tiag tin plated pins yuav tsum muaj tshaj 96% tin, thaum cov khoom cuav yuav raug doped nrog txhuas lossis lwm yam hlau pheej yig.
Chip cov ntaub ntawv: Schottky diode chips tiag tiag yuav tsum siv silicon - cov ntaub ntawv raws li, thaum cov khoom cuav tuaj yeem siv silicon carbide (SiC) los ua tus neeg, tab sis lawv cov ntsiab lus sib txawv tuaj yeem tshawb pom los ntawm XRF.
2. Scanning Electron Microscope (SEM)
SEM tuaj yeem soj ntsuam qhov microstructure ntawm diode chips thiab xyuas seb lawv cov txheej txheem tsim khoom puas ua tau raws li cov qauv ntawm lub Hoobkas qub. Piv txwv li:

Chip thickness: Tiag ceev rov qab diode chips feem ntau muaj ib tug tuab ntawm 100-200 μ m, thaum cov khoom cuav yuav muaj tsis sib xws chip thickness vim cov txheej txheem tsis xws luag.
PN junction interface: Qhov tseeb PN junction interface yog qhov tseeb, thaum cov khoom cuav yuav muaj qhov muag tsis pom kev cuam tshuam vim tsis sib xws.
4, Supply Chain Traceability: Kev Tswj Xyuas Zoo los ntawm Qhov Chaw
1. Kev pov thawj ntawm thawj lub Hoobkas tso cai raws
Thaum yuav khoom, qhov tseem ceeb yuav tsum tau muab rau kev xaiv cov neeg tso cai lossis cov neeg xa khoom los ntawm lub Hoobkas qub kom tsis txhob yuav khoom los ntawm kev tsis raug cai. Piv txwv li:

Daim ntawv pov thawj kev tso cai: Tus neeg muag khoom yuav tsum muab daim ntawv pov thawj ntawm lub Hoobkas tso cai thiab xyuas nws qhov tseeb los ntawm lub Hoobkas thawj lub vev xaib lossis kev pabcuam rau cov neeg siv khoom.
Batch traceability: Lub ntim diode tiag yog feem ntau sau nrog tus lej batch, uas tuaj yeem nug los ntawm lub Hoobkas thawj qhov system rau hnub tsim khoom, cov ntaub ntawv xeem, thiab lwm yam ntaub ntawv. Piv txwv li, nyob rau hauv ib qho xwm txheej, batch naj npawb ntawm cov khoom cuav M7 rectifier diodes tsis phim cov ntaub ntawv hauv lub Hoobkas thiab thaum kawg tau lees paub tias yog cov khoom refurbished.
2. Daim ntawv qhia txog kev xeem thib peb
Xav kom cov neeg muab khoom siv los muab cov ntawv tshaj tawm kev xeem tawm los ntawm thib peb -cov koom haum kuaj xyuas (xws li SGS, UL) los xyuas seb lub diode puas ua raws li cov qauv thoob ntiaj teb (xws li IEC 60747). Piv txwv li:

Kev ua raws li RoHS: Daim ntawv ntsuam xyuas yuav tsum qhia meej seb lub diode puas ua raws li RoHS 2.0 tus qauv, uas txhais tau hais tias cov ntsiab lus ntawm cov khoom tsis zoo xws li txhuas, mercury, cadmium, thiab lwm yam yog tsawg dua li qhov txwv.
Kev ntsuam xyuas kev ntseeg tau: Daim ntawv tshaj tawm yuav tsum suav nrog cov ntaub ntawv ntsuas ntawm qhov kub thiab txias (xws li 85℃/ 1000h), siab thiab qis kub caij tsheb kauj vab (-40℃~ 125 degree), thiab lwm yam, txhawm rau txheeb xyuas qhov ruaj khov ntawm diode hauv qhov chaw huab cua.
5, Kev Ua Lag Luam Kev Ua Haujlwm: Teeb duab kev paub los ntawm cov kev kawm tau kawm
Case 1: Counterfeit 1N4007 rectifier diode ua rau lub zog tsis ua haujlwm
Lub chaw tsim khoom siv hluav taws xob tau yuav ib pawg ntawm 1N4007 rectifier diodes thiab pom tias qee qhov hluav taws xob tso tawm hluav taws xob hloov pauv tom qab siv. Tom qab kuaj:

Cov tsos mob: Cov khoom cuav ntawm lub plhaub xim nplhaib offset, hnyav tus pin oxidation.
Electrical performance: Forward resistance>10k Ω, thim rov qab tsuas yog 500k Ω, deb ntawm cov qauv ntawm cov khoom tiag.
Supply chain: Tus neeg muag khoom yog tus neeg sawv cev tsis tau tso cai thiab tsis tuaj yeem muab cov ntaub ntawv pov thawj ntawm cov khoom qub.
Zaj Lus Qhia: Kev tshuaj xyuas nruj me ntsis ntawm cov khoom tsim nyog yuav tsum tau ua thaum lub sij hawm yuav khoom kom tsis txhob muaj kev puas tsuaj ntau dua los ntawm kev yuav khoom tsis zoo ntawm tus nqi qis.
Case 2: Kev kho dua tshiab BAS16 siab- zaus diode cuam tshuam rau kev sib txuas lus zoo
Ib lub chaw tsim khoom siv kev sib txuas lus tau yuav ib pawg ntawm BAS16 siab- zaus diodes thiab pom cov teeb liab distortion tom qab siv. Tom qab kuaj:

Khoom siv: XRF tsom xam pom tias cov nti muaj cov hmoov txhuas ntau dhau thiab tsis ua raws li RoHS cov qauv.
Performance: Reverse recovery time>50ns, deb tshaj qhov tseeb 8ns tus qauv.
Ntim: Siv cov yas pallets rov siv dua yam tsis muaj cov ntawv cim lub Hoobkas.
Zaj Lus Qhia: High zaus diodes muaj kev ua haujlwm siab heev. Thaum yuav khoom, cov neeg muag khoom yuav tsum tau muab cov lus qhia ntxaws ntxaws thiab ntsuas qhov tseem ceeb ntawm oscilloscopes.