Ob peb zaj lus qhia txog kev siv multimeters
1, Ua ntej siv, koj yuav tsum pom kom meej seb qhov kev hloov pauv ua haujlwm puas nyob rau hauv qhov sib txuas ntawm lub zog ntsuas, thiab seb lub ntsuas ntsuas tus cwj mem puas nyob hauv qhov sib thooj.
2, Raws li qhov yuav tsum tau ua ntawm "hauv av" lossis "xub xub" lub cim rau ntawm lub taub hau ntawm lub ntsuas, tso lub multimeter vertically lossis horizontally yog tias tus pointer tsis taw tes rau qhov pib ntawm qhov ntsuas, koj yuav tsum kho cov tshuab xoom. txoj hauj lwm ua ntej.
3, raws li qhov loj ntawm qhov ntsuas qhov ntsuas hluav taws xob xaiv qhov tsim nyog. Kev ntsuas ntawm qhov voltage, tam sim no yuav tsum sim ua kom tus pointer deflection mus rau ntau tshaj 1/2 ntawm tag nrho cov degree, uas yuav txo tau qhov kev xeem yuam kev. Yog tias koj tsis paub qhov luaj li cas ntawm qhov ntsuas, koj tuaj yeem ua ntej siv qhov ntsuas qhov siab tshaj plaws thiab tom qab ntawd maj mam txo qhov ntau kom txog thaum tus pointer muaj qhov loj dua deflection. Tab sis nyob rau hauv qhov kev ntsuam xyuas ntawm high voltage (ntau tshaj 100} volts) los yog siab tam sim no (0.5 amps los yog ntau tshaj 0 yuav tsum tsis txhob raug them rau hloov qhov ntau yam, txwv tsis pub, muaj ib tug muaj peev xwm mus hloov lwm lub tsev. switch contact hluav taws tswm ciab.
4, DC voltage lossis DC tam sim no ntsuas yuav tsum tau them sai sai rau qhov ntsuas polarity. Yog tias koj tsis paub qhov ntsuas qhov ntsuas hluav taws xob ntawm ob lub ntsiab lus ntawm qhov siab thiab qis, ob lub cwj mem tuaj yeem luv luv kov ob lub ntsiab lus, raws li kev taw qhia ntawm qhov taw qhia qhov cuam tshuam los txiav txim siab lub peev xwm ntawm qhov siab thiab qis, thiab tom qab ntawd ntsuas. .
5, thaum ntsuas AC voltage, peb yuav tsum paub seb qhov AC voltage zaus nyob rau hauv qhov kev ua haujlwm zaus ntawm multimeter, qhov kev ua haujlwm ntau zaus ntawm multimeter yog 45-1500Hz. Tshaj li 1500Hz, qhov ntsuas kev nyeem ntawv yuav qis heev. AC voltage scale yog rau sine yoj RMS tus nqi rau scale, yog li lub multimeter tsis tuaj yeem siv los ntsuas peb lub yoj, square yoj sawtooth yoj thiab lwm yam sine yoj voltage. Thaum AC voltage superimposed ntawm DC voltage, yuav tsum tau strung nrog ib tug voltage withstand nqi txaus kom cais lub capacitor thiab ces ntsuas.
6, thaum ntsuas qhov hluav taws xob ntawm lub load, peb yuav tsum xav txog seb qhov kev tiv thaiv sab hauv ntawm lub multimeter yog qhov loj dua qhov kev tiv thaiv, yog tias tsis yog vim cov nyhuv shunt ntawm multimeter, tus nqi nyeem ntawv yuav qis dua tus nqi tiag tiag. , ces koj tsis tuaj yeem kuaj ncaj qha nrog lub multimeter, yuav tsum tau hloov mus rau lwm txoj kev. Multimeter voltage thaiv sab hauv yog sib npaug rau qhov voltage rhiab heev multiplied los ntawm tag nrho cov voltage tus nqi, xws li MF -30 multimeter nyob rau hauv lub DC100 volts thaiv voltage rhiab heev ntawm 5 kilo-ohms, lub block internal kuj yog 500 kilo- ohms ua. Feem ntau hais lus, tsis tshua muaj qhov thaiv sab hauv yog qhov me me, qhov siab ntawm qhov thaiv sab hauv yog qhov loj, thaum qhov tsis tshua muaj hluav taws xob thaiv qhov ntsuas qhov hluav taws xob vim qhov kev tiv thaiv sab hauv yog me me uas ua rau cov nyhuv shunt loj, nws yuav tsim nyog hloov mus rau qhov siab. kuaj, yog li ntawd, txawm hais tias lub pointer deflection lub kaum sab xis yog me me, tab sis vim yog cov nyhuv shunt me me, nws muaj peev xwm hais tias, ntawm qhov tsis sib xws, qhov tseeb dua. Kev ntsuas tam sim no muaj qhov xwm txheej zoo sib xws, multimeter raws li ammeter, ntau ntau yam thaiv sab hauv tsis kam mus rau qhov me me thaiv sab hauv.
7, ntsuas kev tiv thaiv txhua zaus koj hloov lub zog yuav tsum kho qhov xoom. Tus nqi ntawm qhov chaw geometric ntawm lub multimeter kuj scale multiplier los ntawm tus multiplier ntawm cov kev tiv thaiv thaiv yog qhov nruab nrab tsis kam ntawm lub block, uas yog sib npaug rau sab hauv tsis kam ntawm multimeter nyob rau hauv lub block. Qhov nruab nrab qhov ntsuas qhov tseem ceeb yog 8, 10, 12, 13, 16, 20, 24, 25, 30, 60, 75 thiab lwm yam. Resistance scale yog non-linear, siv los xaiv lub iav tsim nyog kom tus pointer kom deb li deb tau taw tes rau hauv nruab nrab ntawm qhov ze, feem ntau nyob rau hauv 0.1Ro-10Ro (Ro ----- nruab nrab nqi resistance) nyob rau hauv qhov ntau ntawm kev nyeem ntawv ntau dua, sab nraum qhov kev ua yuam kev no ntau dua. Piv txwv li, MF10 multimeter center scale tus nqi ntawm 13, nyob rau hauv lub Rx10 kilo-ohm block Ro=130 kilo-ohm, lub block yog haum rau ntsuas 13 kilo-ohm - 1. 3 megohm tsis kam.
