(1) JJG99-90 thiab<Qhov hnyav> muaj cov cai tswjfwm ntxaws ntxaws txogkev kho kom raug cov txheej txheem ntawm ntau yamcov chav kawm ntawm qhov hnyav, uas yog lub hauv paus rau qhovkev kho kom raug cov neeg ua haujlwm.
(2) Rau cov chav kawm thawj zaugqhov hnyavdaim ntawv pov thawj calibration yuav tsum tauqhia tus nqi kho ntawm qhov hnyav hauv qhov nqus tsev, qhov hnyav tiag tiag hauv qhov nqus tsev thiab tus nqi kho ntawm qhov hnyav hloov pauv.
(3) Rau qhov hnyav ntawm cov chav kawm thib ob thiab qis dua, daim ntawv pov thawj calibration yuav tsumqhia tus nqi kho qhov hnyav thiab tus nqi qhov hnyav tiag tiag ntawm qhov hnyav hloov pauv.
(4) Rau qhov hnyav ntawm qib, tshwj tsis yog tias muaj cov kev cai tshwj xeeb, tsuas yog kev zam txim raws li txoj cai xwbqhia rau ntawm qhov dav davkev kho kom raug daim ntawv pov thawj, thiab tsis muaj tus nqi kho kom raug.
(5) Rau cov qhov hnyav uas tsim ua ntej cov cai JJG99-90, cov qhov hnyav txheem tuaj yeem ua raws li cov cai hauv qab no:
a. Rau cov qhov hnyav uas ruaj khov hauv chav kawm thib ib thiab chav kawm thib ob, lawv tseem siv tau ua qhov hnyav hauv chav kawm thib ib thiab chav kawm thib ob.
b. Vim yog cov cai tshiab, cov qib thawj, qib ob, E1, thiab lwm yam, 1 (E1), E2, thiab lwm yam, 2 (E2), F1, thiab lwm yam, 3 (F1) qib hnyav yuav tsum yog cov khoom siv khov kho. Yog li ntawd, cov qib thib ob mus rau qib plaub qib hnyav nrog kev tswj ceevqhov rooj yuav tsum yogchav kawmF1 thiab hauv qab no lub chav kawmF1.
c. Cov cai tshiab kuj tseem hais tias qhov kev kho qhov hnyav ntawm qhov hnyav qib tom qab thawj zaugkev kho kom raug lossis kho yuav tsum tsis pub ntau tshaj 1/ ntawm qhov hnyav kam rau siab. Raws li tsab xov xwm no, qhov hnyav qib thib ob mus rau qib tsib thawj nrog kev khokev ua qhov tuaj yeem suav nrog rau hauv chav kawm tshiab thiab qib hnyav series.
d. Piv txwv
1kg qhov hnyav qib thib ob nrog qhov hloov kho qhov, kev kam rau siab±5mg, xyuas F2 thiab lwm yam kev kam rau qhov hnyav±30mg; 4 (F2) chav kawm qhov hnyav kam rau siab yog±15mg. Yog li ntawd, qhov hnyav siv ua qhov hnyav txheem xws li F2, thiabkev kho kom raug qhov tshwm sim yuav muab tus nqi kho; yog tias qhov hnyav ua haujlwm yog 4 (F2) qib hnyav, yuav tsis muaj tus nqi kho.
Rau qhov hnyav 1kg chav kawm thib peb nrog qhov hloov kho tau, nws tuaj yeem siv ua qhov hnyav M1 thiab 5 (M1) chav kawm tib yam.
Rau qhov hnyav 1kg qib plaub nrog qhov hloov kho tau, nws tuaj yeem siv ua qhov hnyav M2 thiab 6 (M2) hauv tib txoj kev.
Xaus lus, cov txiaj ntsig saum toj no kuj siv tau rau qhov hnyav ntawm lwm cov pawg. Cov qhov hnyav thawj zaug ntawm chav kawm thib 2 txog thib 5 (tshwj tsis yog chav kawm thib 2 khov kho) raug cais ua F2, M1, M2 lossischav kawm4 (F2),chav kawm5 (M1),chav kawm6 (M2) thiabchav kawm7 (0) qhov hnyav hauv chav kawm.
Lub sijhawm tshaj tawm: Lub Xya Hli-01-2022