Kev ntsuas ntsuas nrog lub multimeter - cov lus qhia thiab kev ua kom yuam kev
Multimeter kuj ntsuas ntawm peb theem loj
1, lub multimeter peb siv, txawm nyob rau hauv ntsuas voltage los yog tam sim no, tsis kam, yog ib tug ntau. Thaum peb yuav tsum ntsuas qhov tsis kam, peb thawj zaug yuav tsum tau hloov mus rau ohm iav. Feem ntau muaj: × 1, × 10, × 100, × 1000 ob peb nres.
2, ua ntej ntsuas yog tus pointer ntawm lub rooj lossis (digital multimeter ob caj npab luv luv thaum nyeem ntawv tsis yog xoom), nws yuav ua rau kev nyeem ntawv tsis raug xoom. Yog tias peb pom ua ntej qhov kev xeem, tsis yog xoom, peb yuav tsum xub kho nws mus rau xoom txoj hauj lwm, txoj kev yog raws li hauv qab no:
3, xaiv tus multiplier
Kev siv multimeter resistance meter resistance meter resistance meter resistance meter resistance meter kuj, txhawm rau pab txhawb kev nyeem ntawv kom raug, kom deb li deb tau ua kom lub koob taw qhia mus rau nruab nrab ntawm lub dial, yog li koj yuav tsum xaiv cov khoom sib txuas kom zoo. Yog hais tias lub multimeter tsis × 10k multiplier block, koj tuaj yeem xaiv qhov ze tshaj plaws block.
Lub hauv paus ntsiab lus ntawm kev ntsuas ntsuas los ntawm multimeter
Lub hauv paus ntsiab lus ntawm kev ntsuas qhov tsis kam nrog lub multimeter yog ua tau raws li Ohm txoj cai. Qhov voltage ntawm lub multimeter yog qhov hluav taws xob ntawm lub roj teeb, thiab nws muaj ntau qhov tseem ceeb ntawm kev ua haujlwm, nrog rau qhov kev tiv thaiv peb xav sim, nws cov kev hloov kho tau (qhov sib txawv ntawm lub tshuab multimeter, nws qhov kev tiv thaiv sab hauv yog txawv), thiab nws qhov ruaj khov. Thiab qhov tam sim no suav nrog thaum peb qhov kev sim ntsuas yog sib npaug rau xoom. Qhov no muab peb cov qauv: I {{0}} U/(Rg + R tsau + R kho + R ntsuas) U yog qhov hluav taws xob ntawm nws cov roj teeb sab hauv, Rg yog qhov tsis kam ntawm lub ntsuas lub taub hau, R tsau , tsis tu ncua nyob rau hauv series nrog lub taub hau ' meter ', R kho, qhov sib txawv tsis sib xws rau zeroing, thiab R ntsuas, qhov ntsuas tsis kam. Thaum qhov ntsuas tsis kam Rx=0, tam sim no nyob rau hauv Circuit Court yog siab tshaj, kho R kom lub deflection lub kaum sab xis ntawm lub pointer ntawm lub ntsuas mechanism rau tag nrho scale tus nqi, lub sij hawm no tus nqi ntawm tam sim no nyob rau hauv lub Circuit Court. I0=E / R. Thaum qhov ntsuas tsis kam Rx nce, qhov tam sim no kuv=E / (R + Rx) maj mam txo qis, thiab lub kaum sab xis ntawm lub pointer kuj txo. Yog li ntawd, qhov ntsuas tsis kam ntawm lub dial ntawm multi-meter yog thim rov qab thiab tsis sib npaug. Yog hais tias qhov ntsuas tsis kam Rx=R, ces tam sim no kuv {{10}} I0/2 thiab lub kaum sab xis ntawm deflection ntawm tus taw tes yog ib nrab ntawm lub kaum sab xis ntawm deflection. Yog li ntawd, tus nqi tiv thaiv tau cim rau ntawm qhov nruab nrab ntawm qhov ntsuas (paub tias yog qhov nruab nrab tsis kam) uas yog, qhov ntau ntawm cov khoom siv hluav taws xob sab hauv ntawm multi-meter. Feem ntau qhov kev nyeem tau zoo ntawm qhov ntsuas tus nqi tiv thaiv yog 0.1 txog 10 npaug ntawm tus nqi nruab nrab.
