Yuav suav Ohms li cas ntawm Multimeter (3 Txoj Kev Qhia)

Ib qho ohmmeter lossis digital ohmmeter yog qhov tseem ceeb rau kev ntsuas qhov hluav taws xob tiv thaiv hluav taws xob. Piv nrog rau lawv cov analog counterparts, cov ohms yog yooj yim rau siv. Txawm hais tias ohmmeters yuav txawv ntawm tus qauv, lawv ua haujlwm zoo ib yam. Piv txwv li, cov duab digital loj qhia qhov ntsuas ntsuas thiab tus nqi tiv thaiv, tus lej feem ntau ua raws li ib lossis ob qhov chaw lej.

Cov ncej no qhia koj yuav ua li cas nyeem ohms ntawm digital multimeter.

Tej yam uas yuav tsum nco ntsoov ua ntej

Thaum koj kawm yuav ua li cas nyeem ohms ntawm ib lub multimeter, nws yog tsim nyog sau cia hais tias lub cuab yeej ntsuas qhov tseeb ntawm kev tiv thaiv, nws theem ntawm functionality, raws li zoo raws li voltage thiab tam sim no. Yog li ntawd, qhov no txhais tau hais tias koj tuaj yeem siv nws thaum ntsuas qhov kev tawm tsam hauv qhov tsis muaj kev tiv thaiv.

Nrog lub peev xwm los ntsuas qhov tsis kam, cov khoom siv multimeter kuj tuaj yeem kuaj rau qhov qhib lossis hluav taws xob cuam tshuam. Peb qhia rau cov neeg siv kom kuaj lub multimeter ua ntej kom paub tseeb tias nws ua haujlwm zoo. (1)

Tam sim no cia peb tsiv mus rau peb txoj hauv kev los ntsuas qhov tsis kam ntawm multimeter.

Nyeem cov duab digital

1. Thawj kauj ruam entails defining lub reference scale. Tom ntej no mus rau omega, nrhiav "K" lossis "M". Ntawm koj lub ohmmeter, lub cim omega qhia txog qib ntawm kev ua haujlwm. Cov zaub ntxiv "K" lossis "M" nyob rau hauv pem hauv ntej ntawm lub cim omega yog tias qhov tsis kam ntawm qhov koj tab tom sim yog nyob rau hauv kiloohm lossis megaohm ntau. Piv txwv li, yog tias koj tsuas muaj lub cim omega thiab koj tau txais kev nyeem ntawv ntawm 3.4, uas tsuas yog txhais mus rau 3.4 ohms. Ntawm qhov tod tes, yog nyeem 3.4 ua raws li "K" ua ntej omega, nws txhais tau tias 3400 ohms (3.4 kOhm).

2. Cov kauj ruam thib ob yog nyeem tus nqi tiv thaiv. Nkag siab txog qhov ntsuas digital ohmmeter yog ib feem ntawm cov txheej txheem. Qhov tseem ceeb ntawm kev nyeem cov duab digital yog nkag siab txog tus nqi tiv thaiv. Ntawm cov duab digital, cov lej tau pom nyob rau hauv nruab nrab pem hauv ntej thiab, raws li tau hais ua ntej, mus rau ib lossis ob qhov chaw lej. Tus nqi tiv thaiv tau pom nyob rau ntawm cov duab digital ntsuas qhov twg cov khoom lossis cov cuab yeej txo qis cov hluav taws xob tam sim no ntws los ntawm nws. Cov lej siab dua txhais tau tias muaj kev tiv thaiv ntau dua, uas txhais tau hais tias koj lub cuab yeej lossis cov khoom siv xav tau ntau lub zog los ua ke cov khoom sib xyaw rau hauv Circuit Court. (2)

3. Qhov thib peb kauj ruam yog los xyuas seb qhov teeb tsa muaj tsawg dhau. Yog tias koj pom ob peb kab dotted, "1" lossis "OL" uas txhais tau tias dhau lub voj voog, koj tau teeb tsa ntau yam tsawg dhau. Qee lub 'meter' tuaj nrog autorange, tab sis yog tias koj tsis muaj ib qho, koj yuav tsum teeb tsa koj tus kheej.

Yuav siv lub 'meter' li cas

Txhua tus pib yuav tsum paub nyeem ohms ntawm lub multimeter ua ntej siv nws. Koj yuav kawm sai sai no tias kev nyeem ntawv multimeter tsis nyuaj li nws zoo li.

Ntawm no yog yuav ua li cas nws ua:

1. Nrhiav lub "power" lossis "ON / OFF" khawm thiab nias nws.
2. Xaiv qhov kev ua haujlwm tsis kam. Txij li thaum lub multimeter txawv ntawm ib tus qauv mus rau lwm tus, xyuas cov chaw tsim khoom cov lus qhia rau xaiv tus nqi kuj. Koj lub multimeter tuaj yeem tuaj nrog lub dial lossis hloov pauv. Tshawb xyuas nws thiab tom qab ntawd hloov cov chaw.
3. Nco ntsoov tias koj tsuas tuaj yeem ntsuas qhov kev tiv thaiv hluav taws xob thaum lub tshuab hluav taws xob poob. Txuas nws mus rau lub hwj chim qhov chaw yuav ua rau lub multimeter puas thiab invalidate koj cov kev nyeem ntawv.
4. Yog tias koj xav ntsuas qhov tsis kam ntawm cov khoom sib cais, hais lub capacitor lossis resistor, tshem tawm ntawm qhov ntsuas. Koj tuaj yeem tshawb pom yuav ua li cas tshem tawm cov khoom siv los ntawm ib lub cuab yeej. Tom qab ntawd pib ntsuas qhov kev tiv thaiv los ntawm kev kov cov tshuaj ntsuam xyuas rau cov khoom. Koj puas tuaj yeem pom cov nyiaj hlau tawm ntawm cov khoom? Cov no yog cov coj.

Kev teeb tsa ntau yam

Thaum siv lub autorange multimeter, nws cia li xaiv qhov ntau thaum kuaj pom qhov voltage. Txawm li cas los xij, koj yuav tsum teeb hom rau txhua yam koj ntsuas, xws li tam sim no, voltage, lossis tsis kam. Tsis tas li ntawd, thaum ntsuas tam sim no, koj yuav tsum txuas cov xov hlau mus rau cov khoom sib txuas uas tsim nyog. Hauv qab no yog ib daim duab uas qhia cov cim uas koj yuav tsum pom ntawm qhov bar.

Yog tias koj yuav tsum teeb tsa koj tus kheej, nws raug nquahu kom koj pib nrog qhov siab tshaj plaws muaj ntau yam thiab tom qab ntawd ua haujlwm koj txoj hauv kev mus rau qis qis kom txog thaum koj tau txais ohmmeter nyeem ntawv. Yuav ua li cas yog tias kuv paub qhov ntau ntawm cov khoom nyob rau hauv kev sim? Txawm li cas los xij, ua haujlwm kom txog thaum koj tau txais kev nyeem ntawv tsis kam.

Tam sim no koj paub yuav ua li cas nyeem ohms ntawm DMM, muaj qee qhov kev ceev faj koj yuav tsum nco ntsoov. Kuj xyuas kom tseeb tias koj siv lub cuab yeej kom raug. Feem ntau, kev ua tsis tiav yog tshwm sim los ntawm tib neeg kev ua yuam kev.

Hauv qab no yog qee qhov lwm cov lus qhia kev kawm multimeter uas koj tuaj yeem tshuaj xyuas lossis bookmark rau kev nyeem tom qab.

• Yuav ua li cas nyeem ib tug analog multimeter
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tswv yim pom zoo

(1) kev poob siab thaum - https://www.mayoclinic.org/first-aid/first-aid-electrical-shock/basics/art-20056695

(2) decimal point - https://www.mathsisfun.com/definitions/decimal-point.html