Cov cuab yeej ntsuas yog ib qho cuab yeej rau ntsuas ib yam khoom. Xws li ntev, kub, sijhawm, huab hwm coj, quab yuam, tam sim no, voltage, tsis kam, suab, xov tooj cua, refractive index thiab nruab nrab dispersion.
Qee cov cuab yeej ntsuas tshuab, xws li squares, calipers, thiab lwm yam, tau siv thawj zaug hauv kev tsim khoom siv tshuab. Nyob rau hauv lub xyoo pua 16th, du gauges tau siv nyob rau hauv artillery manufacture. Xyoo 1772 thiab 1805, British J. Watt thiab H. Maudsley, thiab lwm yam tau ua tiav ua lub Watt micrometer thiab lub tshuab ntsuas qhov ntev uas siv lub hauv paus ntsiab lus ntawm xov khub. Tom qab ib nrab xyoo pua -19, cov cuab yeej ntsuas zoo ib yam li niaj hnub tshuab sab nrauv micrometers thiab vernier calipers tau tshwm sim. Nyob rau thaum xaus ntawm lub xyoo pua puv 19, pawg ntawm gauge blocks tshwm. Tom qab qhov tshwm sim ntawm cov cuab yeej ntsuas ntsuas yog ib pawg ntawm cov cuab yeej ntsuas qhov muag. Thaum kawg ntawm lub xyoo pua 19th, ntsug ntev ntsuas ntsuas tau tshwm sim, thiab thaum pib ntawm lub xyoo pua 20th, cov tshuab ntsuas qhov ntev tau tshwm sim. Los ntawm xyoo 1920s, projectors, cuab yeej microscopes, optical micrometers, thiab lwm yam tau siv rau kev ntsuas hauv kev tsim khoom. Xyoo 1928, pneumatic ntsuas pneumatic tau tshwm sim, uas yog cov cuab yeej ntsuas tsim nyog rau kev siv ntau lawm. Cov cuab yeej ntsuas hluav taws xob tau tshwm sim hauv xyoo 1930s. Thaum xub thawj muaj qhov txwv ntsuas thiab profilers ua nrog inductive ntev sensors. Thaum xyoo 1950s lig, kev sib koom tes ntsuas cov tshuab uas pom cov txiaj ntsig ntsuas digitally tshwm sim. Hauv nruab nrab -1960s, kev sib koom tes ntsuas tshuab nrog hluav taws xob siv computer-pab ntsuas tau siv hauv kev tsim khoom siv tshuab. Thaum xyoo 1970s, lub khoos phis tawj digitally tswj cov iav ntsuas ntsuas tau tshwm sim dua. Lub sijhawm no, cov cuab yeej ntsuas tau nkag mus rau theem ntawm kev siv hluav taws xob hauv computer.
Nws muaj ob lub ntsiab ntawm cov stopwatches: mechanical thiab electronics, thiab electronic watches yuav muab faib ua ob pawg: peb-khawm thiab plaub-khawm. Feem ntau cov kws qhia cev nqaij daim tawv siv hluav taws xob nres, thiab cov neeg kho tshuab nres tau dhau los ua keeb kwm hauv ntau qhov chaw. Lub tshuab hluav taws xob nres yog ib hom kev tshaj lij hluav taws xob timer. Lub tshuab hluav taws xob hauv tsev feem ntau siv qhov zaus oscillation ntawm quartz oscillator raws li lub sijhawm siv, thiab siv tus lej 6-cov kua siv lead ua kua digital tso saib lub sijhawm, uas muaj qhov zoo ntawm cov khoom siv tau yooj yim, nyeem ntawv yooj yim thiab ntau yam haujlwm. .
Lub electromagnetic dotting timer yog cov qauv magnetoelectric. Thaum lub kauj yog muab nrog ib tug alternating tam sim no ntawm 5 0 Hz, lub alternating magnetic teb generated los ntawm lub kauj magnetizes lub vibrating daim (ua los ntawm caij nplooj ntoos hlav steel), thiab ib kawg ntawm lub vibrating daim nyob rau hauv lub magnetic teb. ntawm cov hlau nplaum ruaj khov. Txij li thaum lub sib nqus ncej ntawm lub vibrating daim hloov tsis tu ncua nrog kev hloov ntawm cov kev taw qhia tam sim no, nyob rau hauv qhov kev txiav txim ntawm lub magnetic teb ntawm cov hlau nplaum mus tas li, lub vibrating daim yuav co nce thiab nqis. Ib qho kawg ntawm daim ntawv vibrating yog nruab nrog ib rab koob, thaum daim ntawv daim kab xev hla hauv qab rab koob. Tom qab ntawd cov ntsiab lus raug cim, thiab lub sijhawm sib txuas ntawm cov ntsiab lus nyob ib sab yog 0.02 vib nas this. Lub sij hawm sib thooj rau 5 ntu yog 0.1 thib ob.
