Kev sim cov txheej txheem thiab kev paub ntawm Multimeter Resistors:
1. Kev kuaj xyuas cov resistors ruaj khov. A? Txuas ob qhov kev sojntsuam (tsis hais qhov zoo lossis qhov tsis zoo) rau tus pins ntawm ob qho kawg ntawm tus resistor los ntsuas qhov tseeb tus nqi. Txhawm rau txhim kho kev ntsuas qhov tseeb, qhov ntau yuav tsum raug xaiv raws li tus nqi nominal ntawm qhov ntsuas tsis kam. Vim qhov kev sib raug zoo ntawm qhov tsis sib xws ntawm ohmic nplai, qhov nruab nrab ntawm qhov ntsuas yog qhov zoo. Yog li ntawd, tus pointer yuav tsum tau muab tso rau ze li qhov ua tau mus rau qhov nruab nrab ntawm qhov ntsuas, uas yog nyob rau hauv thaj tsam ntawm 20 feem pua rau 80 feem pua radians los ntawm qhov pib ntawm qhov ntsuas tag nrho, txhawm rau ua kom qhov ntsuas qhov tseeb dua. Nyob ntawm theem ntawm kev ua yuam kev tsis kam. Qhov yuam kev ntawm ± 5 feem pua, ± 10 feem pua, lossis ± 20 feem pua yog tso cai ntawm kev nyeem ntawv thiab tus nqi nominal tsis kam, feem. Yog tias nws tsis sib xws thiab dhau qhov kev ua yuam kev ntau, nws qhia tau tias tus nqi tiv thaiv tau hloov pauv. B? Ceeb Toom: Thaum lub sij hawm sim, tshwj xeeb tshaj yog thaum ntsuas qhov tseem ceeb ntawm kev tiv thaiv saum toj kaum ntawm k Ω, tsis txhob kov cov khoom siv hluav taws xob ntawm kev sojntsuam thiab kev tiv thaiv nrog koj txhais tes; Qhov kev sim ntsuas yuav tsum tau muab tshem tawm los ntawm lub voj voog, tsawg kawg yog ib lub taub hau yuav tsum tau soldered qhib kom tiv thaiv lwm yam khoom hauv Circuit Court los ntawm kev cuam tshuam qhov kev xeem thiab ua rau kev ntsuas yuam kev; Txawm hais tias tus nqi tsis kam ntawm cov xim nplhaib resistor tuaj yeem txiav txim siab los ntawm cov cim xim nplhaib, nws yog qhov zoo tshaj plaws los siv ib lub ntsuas ntsuas los ntsuas nws qhov tseeb ntawm qhov tsis kam thaum siv nws.
2. Kev kuaj xyuas cov cement tsis kam. Cov txheej txheem thiab kev ceev faj rau kev kuaj xyuas cov cement kuj zoo ib yam rau cov uas kuaj pom cov resistors zoo tib yam.
3. Kev txheeb xyuas cov fused resistors. Nyob rau hauv ib lub voj voog, thaum lub fuse resistor tau tshuab qhib, kev txiav txim siab tuaj yeem ua raws li kev paub dhau los: yog tias qhov chaw ntawm lub fuse resistor pom tias yog xim dub lossis kub hnyiab, nws tuaj yeem txiav txim siab tias nws qhov hnyav dhau, thiab tam sim no. dhau los ntawm nws tshaj tus nqi ntsuas ntau zaus; Yog tias tsis muaj kab nyob rau ntawm nws qhov chaw thiab muaj qhov qhib Circuit Court, nws qhia tau hais tias tam sim no ntws tsuas yog sib npaug los yog me ntsis ntau dua nws cov nqi fuse. Rau qhov kev txiav txim siab ntawm qhov zoo ntawm fused resistor yam tsis muaj kab nyob rau ntawm qhov chaw, lub multimeter R tuaj yeem siv tau × Los xyuas kom meej qhov ntsuas, ib kawg ntawm lub fuse resistor yuav tsum tau soldered tawm ntawm Circuit Court nyob rau hauv iav 1. Yog hais tias qhov ntsuas kuj muaj nqi. yog infinite, nws qhia tau hais tias lub fused resistor tau ua tsis tau tejyam thiab qhib Circuit Court. Yog tias qhov ntsuas ntsuas qhov ntsuas qhov sib txawv ntawm tus nqi nominal, nws qhia tau tias qhov kev tiv thaiv tau hloov pauv thiab yuav tsum tsis txhob siv dua. Hauv kev xyaum tu, nws tau pom tias kuj tseem muaj ob peb lub fuse resistors uas tau tawg thiab luv luv hauv Circuit Court, thiab yuav tsum tau them nyiaj thaum kuaj.
4. Kev txheeb xyuas cov potentiometers. Thaum kuaj xyuas lub potentiometer, thawj kauj ruam yog tig lub pob qhov rooj kom pom tias nws tig tau zoo, txawm tias qhov hloov pauv hloov tau, seb lub suab "nias" yog qhov tseeb thaum lub qhov hloov pauv tau qhib lossis tawm, thiab mloog lub suab ntawm kev sib txhuam. cov ntsiab lus sab hauv ntawm lub potentiometer thiab lub cev resistor. Yog tias muaj lub suab "rustle", nws qhia tias tsis zoo. Thaum siv multimeter rau kev sim, ua ntej xaiv qhov tsim nyog cov iav tiv thaiv ntawm multimeter raws li tus nqi tsis kam ntawm cov ntsuas potentiometer, thiab tom qab ntawd ua qhov kev ntsuas raws li cov hauv qab no.
Siv lub ohmic ntau yam ntawm ib lub multimeter los ntsuas ob qhov kawg ntawm "1" thiab "2", thiab kev nyeem ntawv yuav tsum yog tus nqi tsis kam ntawm potentiometer. Yog hais tias tus pointer ntawm lub multimeter tsis txav los yog tus nqi kuj txawv heev, nws qhia tau hais tias lub potentiometer puas lawm.
Xyuas seb qhov kev sib cuag ntawm lub caj npab txav ntawm lub potentiometer thiab lub resistor puas zoo. Ntsuas ob qhov kawg ntawm "1" thiab "2" (los yog "2" thiab "3") siv lub ohm ntau ntawm multimeter, thiab tig lub potentiometer ncej counterclockwise rau txoj hauj lwm ze rau "tawm". Hauv qhov no, qhov tsawg dua qhov kev tiv thaiv tus nqi, qhov zoo dua. Maj mam tig tus ncej tuav clockwise dua, tus nqi kuj yuav tsum maj mam nce, thiab tus pointer nyob rau hauv lub 'meter' lub taub hau yuav tsum txav smoothly. Thaum tus ncej kov tig mus rau qhov chaw siab "3", tus nqi kuj yuav tsum nyob ze rau tus nqi nominal ntawm potentiometer. Yog hais tias tus pointer ntawm lub multimeter dhia thaum lub sij hawm kev sib hloov ntawm lub potentiometer ncej, nws qhia tau hais tias muaj ib tug ua txhaum ntawm kev sib cuag tsis zoo ntawm lub movable contact point.
