multimeter rhiab heev
1. Kev nkag siab zoo thiab kev xaiv kev txawj ntawm multimeters
rhiab heev yog ib qho kev qhia uas qhia txog qib uas lub ntsuas tau teb rau lub zog tsis muaj zog.
Txij li thaum lub zog rau kev tsav tsheb lub deflection ntawm lub ntsuas mechanism ntawm lub ntsuas yog muab los ntawm lub tam sim no nyob rau hauv lub Circuit Court nyob rau hauv kev ntsuam xyuas, yog hais tias tus pointer ntawm lub ntsuas yog deflected los ntawm ib tug loj npaum li cas thiab siv ib tug me me lub zog, nws rhiab heev yuav siab dua. .
Lub rhiab heev ntawm multimeter tuaj yeem muab faib ua peb qhov ntsuas: DC voltage rhiab heev, AC voltage rhiab heev thiab meter rhiab heev. DC voltage rhiab heev yog lub ntsiab qhia. AC voltage rhiab heev yog feem ntau qis dua DC voltage rhiab heev vim 'meter' Circuit Court tsim yam tseem ceeb. Lawv raug cim rau ntawm lub dial nyob rau hauv ohms ib volt (Ω / V) kom peb pom ib nrais muag. Lub rhiab heev ntawm lub taub hau ' meter ' qhia tag nrho cov nqi tam sim no ntawm lub taub hau ' meter ', thiab tseem suav nrog ob qhov ntsuas, qhov kev tiv thaiv sab hauv thiab linearity ntawm lub taub hau 'meter', uas yog lub hauv paus rau kev suav cov ntsuas hluav taws xob, thiab tseem txiav txim siab qhov voltage rhiab heev. ntawm tag nrho cov multimeter; Internal kuj ntawm lub taub hau ' meter ' yog hais txog tus pointer ntawm lub 'meter'. Qhov sib npaug ntawm qhov tseem ceeb ntawm kev ua haujlwm ntawm cov kauj vab txav thiab sab saud thiab qis hairsprings; linearity yog hais txog qhov sib xws ntawm qhov kev siv tam sim no dhau los ntawm lub ntsuas thiab qhov deflection amplitude ntawm rab koob, uas yog siv los ua lub hauv paus rau kev ntsuas ntsuas ntawm lub dial. Lub hom phiaj ntawm no yog nyob rau ntawm DC voltage rhiab heev ntawm lub multimeter.
Thaum lub voltmeter yog siv rau kev ntsuas, nws txuas nrog nyob rau hauv parallel nrog ob lub ntsiab lus nyob rau hauv kev sim. Vim muaj qhov muaj nyob hauv qhov tsis kam ntawm lub voltmeter, nws yog sib npaug rau kev sib txuas ntawm cov resistor nyob rau hauv tib lub sijhawm ntawm ob lub ntsiab lus hauv kev sim, uas txo cov impedance tag nrho ntawm ob lub ntsiab lus hauv kev sim; Ua ke nrog nws cov nyhuv shunting ntawm lub voj voog, qhov ntsuas qhov ntsuas hluav taws xob qis dua tus nqi tiag tiag. Yog li ntawd, thaum ua qhov ntsuas hluav taws xob, lub multimeter yuav tsum muaj lub zog sab hauv (uas yog, qhov rhiab heev Ω / V tus lej yuav tsum siab) txhawm rau txo qhov yuam kev no.
Piv txwv li, DC voltage ntau ntawm MF30 multimeter yog 0-1-5-25-100-500V, thiab lub dial yog cim nrog 20000Ω / V, ces lub internal kuj ntawm 1V ntau yog 20kΩxl=20kΩ; Lub zog sab hauv ntawm 5V ntau yam yog 20kΩx5=100kΩ, thiab lwm yam.
Lub rhiab heev ntawm multimeter tuaj yeem muab faib ua ob qhov ntsuas: lub taub hau rhiab heev thiab qhov hluav taws xob rhiab heev (xws li DC voltage rhiab heev thiab AC voltage rhiab heev).
Tus nqi tag nrho Ig (uas yog, tag nrho-teev tam sim no) ntawm lub 'meter' siv los ntawm multimeter yog hu ua rhiab heev ntawm lub 'meter'. Ig feem ntau yog 9.2 txog 200 μA. Qhov me me ntawm Ig, qhov siab dua ntawm qhov ntsuas. Tus nqi tag nrho ntawm qhov ntsuas qhov ntsuas siab yog feem ntau tsawg dua 10μA, qhov ntsuas tag nrho ntawm qhov ntsuas nruab nrab-rhiab heev feem ntau yog 30-100μA, thiab qhov ntsuas qhov ntsuas qis yog ntau tshaj 100μA.
Qhov voltage rhiab heev ntawm lub multimeter yog sib npaug rau qhov sib npaug ntawm qhov sib npaug ntawm qhov hluav taws xob tiv thaiv hluav taws xob mus rau qhov ntsuas tag nrho, thiab nws chav tsev yog Ω / V lossis kΩ / V, hu ua ohms ib volt.
multimeter rhiab heev
Daim duab 1: Voltage rhiab heev ntawm multimeter
DC voltage rhiab heev yog lub ntsiab technical Performance index ntawm multimeter. AC voltage rhiab heev yog cuam tshuam los ntawm lub rectifier Circuit Court thiab feem ntau qis dua DC voltage rhiab heev. Piv txwv li, DC voltage rhiab heev ntawm Model 500 yog 20kΩ / V, thiab AC voltage rhiab heev rau 4kΩ / V.
Qhov siab dua qhov voltage rhiab heev, qhov siab dua qhov kev tiv thaiv sab hauv ntawm multimeter (uas yog, qhov kev tawm tsam ntawm lub 'meter'), thiab qhov siab dua cov teeb liab voltage uas tuaj yeem ntsuas qhov kev tiv thaiv sab hauv.
