Cov ntsiab lus tseem ceeb rau kev siv pointer multimeter
Tus pointer hom (tseem hu ua analog hom) multimeter muaj keeb kwm kev loj hlob ze li ntawm ib puas xyoo. Vim nws cov haujlwm ua tiav, kev ua haujlwm yooj yim, kev txav tau yooj yim, tus nqi qis, thiab kev saib xyuas yooj yim, nws tau ntev ua ib qho cuab yeej tsim nyog rau kev ntsuas hluav taws xob thiab kev ua haujlwm. Hauv qab no yog ob peb lub ntsiab lus tseem ceeb rau kev siv tus pointer multimeter.
Ua ntej siv lub tshuab multimeter, ib tus yuav tsum paub txog cov haujlwm ntawm txhua qhov hloov pauv hloov lub pob qhov rooj, lub qhov (socket), ntsuas qhov (socket), thiab cov cuab yeej ntsuas ntsuas, thiab nkag siab txog qhov sib thooj ntsuas ntawm txhua kab. Txhua zaus koj tuaj tos qhov kev sojntsuam los npaj rau kev ntsuas, nco ntsoov xyuas seb hom kev ntsuas thiab ntau qhov kev xaiv hloov pauv nyob rau hauv qhov tseeb.
1) Lub pointer multimeter feem ntau yuav tsum tau muab tso rau kab rov tav thaum siv, txwv tsis pub nws yuav ua rau qaij yuam kev. Nws pom tias tus pointer tsis taw tes rau txhua yam xoom point. Cov ntsia hlau nyob rau hauv lub taub hau ' meter ' yuav tsum tau kho kom rov qab tus pointer mus rau xoom thiab tshem tawm qhov yuam kev xoom.
2) Lub multimeter yuav tsum tau siv thiab khaws cia rau hauv qhov chaw qhuav, tsis muaj kev vibration, muaj zog sib nqus tsis muaj zog, thiab qhov chaw kub zoo. Ib qho chaw ntub dej tuaj yeem txo cov rwb thaiv tsev lub zog ntawm cov twj paj nruag thiab ua rau cov khoom puas hauv cov twj paj nruag vim tias ya raws. Mechanical vibration thiab kev cuam tshuam tuaj yeem demagnetize cov hlau nplaum ntawm lub taub hau 'meter', uas ua rau txo qis rhiab heev. Thaum siv ze ntawm cov hlau nplaum muaj zog, kev ntsuas qhov yuam kev yuav nce. Yog tias qhov kub thiab txias dhau los yog qis dhau, nws tuaj yeem ua rau muaj kev hloov pauv hauv pem hauv ntej thiab rov qab ua haujlwm ntawm lub rectifier tivthaiv, hloov cov rectification coefficient, cuam tshuam qhov rhiab heev ntawm lub taub hau 'meter', thiab qhov tseem ceeb ntawm kev tiv thaiv ntawm shunt resistor thiab voltage divider. resistor, ua rau kub tsis raug.
3) Tom qab kev ntsuas tiav lawm, qhov kev xaiv ntau yam hloov pauv yuav tsum tau teem rau qhov siab tshaj plaws voltage kom tiv thaiv kev kub hnyiab ntawm lub 'meter' lwm zaus. Qee qhov multimeters (500 hom) muaj qhov nruab nrab, lossis tom qab siv lub iav "OFF", lub pob qhov hloov yuav tsum tig mus rau txoj haujlwm tsim nyog rau luv luv-circuit ntsuas mechanism sab hauv.
4) Yog hais tias DC voltage ntau yog siv yuam kev los ntsuas AC voltage, lub meter koob yuav tsis txav los yog co me ntsis; Yog tias AC voltage ntau yog siv los ntsuas qhov DC voltage, qhov kev nyeem ntawv yuav yog ob zaug siab lossis xoom, nyob ntawm qhov tshwj xeeb kev sib txuas ntawm multimeter.
5) Qhov yuam kev yooj yim ntawm qhov ntsuas hluav taws xob yog qhia raws li feem pua ntawm tag nrho cov nplai, yog li qhov ze dua qhov ntsuas tus nqi yog rau qhov ntsuas tag nrho, qhov yuam kev me dua. Feem ntau hais lus, qhov kev xaiv yuav tsum muaj peev xwm deflect tus pointer los ntawm ntau tshaj 1/3 txog 1/2.
6) Thaum ntsuas qhov hluav taws xob ntawm cov khoom siv hluav taws xob sab hauv, nws raug nquahu kom xaiv qhov hluav taws xob ntau dua li ntau li ntau tau txhawm rau txhawm rau ua kom muaj zog sab hauv ntawm qhov hluav taws xob ntau. Qhov no txo qhov deflection lub kaum sab xis ntawm tus taw tes, tab sis qhov ntsuas tau txais tuaj yeem cuam tshuam qhov xwm txheej tiag tiag. Txawm li cas los xij, qhov kev ntsuas tseem ceeb tseem yuav tshwm sim.
7) Vim tias qhov tsis yog linearity ntawm rectifier Cheebtsam, qhov yuam kev ntawm kev ntsuas AC voltage hauv qab 1V nrog ib tug multimeter kuj yuav nce. Yog li ntawd, ntau multimeters tsis teev AC voltage hauv qab 1V.
8) Lub multimeter tsis tuaj yeem ntsuas ncaj qha tsis yog sinusoidal voltages xws li square waves, rectangular waves, triangular waves, sawtooth waves, trapezoidal waves, thiab lwm yam. scale yog calibrated raws li tus nqi zoo ntawm sinusoidal AC voltage. Yog tias qhov ntsuas hluav taws xob tsis yog sine yoj, kev sib raug zoo ntawm nws tus nqi nruab nrab thiab tus nqi zoo yuav hloov pauv, yog li nws tsis tuaj yeem nyeem ncaj qha.
