Qhov chaw khaws cia ntawm txhua qib ntawm cov khoom, cov xwm txheej khaws cia thiab lub sijhawm siab tshaj plaws tom qab ntim thiab tshem tawm:
Humidity rhiab heev theem | Ntim Cov Lus Qhia | Cia ib puag ncig | Kev cia khoom thiab lub sijhawm siab tshaj plaws tom qab qhib |
1 | Tsis Xav Tau | Tsis Xav Tau | Tsis Xav Tau, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH |
2 | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | Ib xyoos, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH |
2a | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | Plaub lis piam, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH |
3 | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | Ib lub lim tiam, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH |
4 | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | 72 teev, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH |
5 | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | 48 小时, Tsawg dua lossis sib npaug li 30 degree , 60 feem pua RH |
5a | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | 24 小时, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH |
6 | MBB (xws li HIC) nrog tus nqi tsim nyog desiccant thiab daim ntawv ceeb toom yuav tsum tau | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | Cov khoom xyaw yuav tsum tau ci ua ntej siv. Nco ntsoov tias reflow soldering yuav tsum tau nyob rau hauv lub sij hawm txwv teev nyob rau hauv daim ntawv lo |
7 | 0SP PCB | Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH | 24 teev, Tsawg dua lossis sib npaug li 30 degree, 60 feem pua RH Lub neej txee siab tshaj plaws yog rau lub hlis |
Los ntawm cov lus saum toj no, qhov kev ua tau zoo thiab cov kev xav tau ntawm cov khoom siv desiccant, cov ntaub ntawv av noo thiab cov hnab ntim cov dej noo yog qhov tseem ceeb heev. Tshwj xeeb yog lub hnab,
yog tias lub ntim tsis zoo, nws yuav cuam tshuam rau qhov zoo ntawm cov khoom. Cov hauv qab no yog los qhia txog cov kev xav tau ntawm peb cov khoom no:
Lub MBB: noo noo Barrier Hnab tsis yog xav tau cov ntaub ntawv pov thawj, tab sis kuj xav tau ESD.
Lub hnab ntim dej noo yuav tsum ua tau raws li MIL-PRF-81705, HOM I yuav tsum tau ua kom yooj,
ESD tiv thaiv, mechanical zog, thiab puncture kuj. Cov hnab yuav tsum tau ua kom sov sealable. Cov Dej Vapor Transmission Rate (WVTR) yuav tsum tsawg dua lossis sib npaug rau 0.002 gm / 100 in2 hauv 24 teev ntawm 40 degree tom qab flex testing ib yam "E''ASTM F 392. Lub WVTR yog ntsuas siv ASTM F 1249.
Cov khoom siv desiccant yuav tsum ua raws li MIL-D-3464, HOM II. Desiccant yuav tsum tsis muaj plua plav, tsis muaj corrosive,
thiab absorbent rau tus nqi teev nyob rau hauv tus qauv. Cov desiccant yuav tsum tau ntim rau hauv cov hnab ntim dej los yog cov hnab ntim khoom.Tus nqi ntawm cov khoom siv desiccant, ib lub hnab ntim dej noo, yuav tsum ua raws li lub hnab ntim thiab WVTR txhawm rau txhawm rau txwv cov av noo sab hauv hauv MBB kom tsawg dua 10 feem pua ntawm 25 degree.
Rau kev sib piv ntawm ntau hom desiccant, tub rog specifications tau txais "UNIT" raws li qhov yooj yim chav tsev ntawm kev ntsuas kom muaj nuj nqis rau cov khoom desiccant. UNIT ntawm desiccant txhais tau tias yog tus nqi uas yuav nqus tau qhov tsawg kawg nkaus ntawm 2.85 g ntawm dej vapor ntawm 20 feem pua RH thiab 25 degree.
Thaum lub peev xwm desiccant ntawm 10 feem pua RH thiab 25 degree paub tias qhov sib npaug hauv qab no yuav tsum tau siv.
U {{0}} (0.304 * M *WVTR * A)/D
qhov twg:
U=Tus nqi ntawm desiccant hauv UNITS
M=Lub neej txee xav tau hauv lub hlis
WVTR=Tus nqi xa dej vapor hauv grams/m2 (grams/100 in2) hauv 24 teev
A=Tag nrho thaj chaw nthuav dav ntawm MBB hauv square metres (square inches)
D=Tus nqi dej hauv grams, uas UNIT ntawm desiccant yuav nqus ntawm 10 feem pua RH thiab 25 degree
HIC yuav tsum muaj peb (3) xim xim nrog qhov muaj txiaj ntsig ntawm 5 feem pua, 10 feem pua RH thiab 60 feem pua RH. Cov chaw yuav tsum qhia cov av noo nrog qhov tseem ceeb, pom qhov hloov pauv ntawm cov xim ntawm xiav mus rau paj yeeb, thaum kuaj cov xim yuav tsum tau piav qhia hauv daim npav.
Hom HIC Spot Ua Raws Cai
