Digital multimeter kuj ntsuas txoj kev thiab ceev faj
Thaum lub sij hawm ntsuas, qhov zoo fais fab mov tsub lub capacitor Cx nyob rau hauv kev sim los ntawm tus qauv resistor R {{0}}. Thaum lub sijhawm them nyiaj pib, txij li Vc=0, "000" tshwm. Raws li Vc maj mam nce siab, qhov tso tawm tus nqi nce. Thaum Vc=2VR, lub twj paj nruag pib tso cov cim hla "1". Lub sij hawm them nqi t yog lub sij hawm xav tau rau cov nqi zaub hloov ntawm "000" kom dhau. Lub sijhawm no tuaj yeem ntsuas nrog lub quartz saib. Thaum siv DT830 digital multimeter los kwv yees lub peev xwm ntawm lub capacitor xws li 0.1μF mus rau ntau txhiab microfarads, koj tuaj yeem xaiv qhov kev tawm tsam raws li Table 5-1. Lub rooj muab qhov ntau ntawm kev ntsuas lub peev xwm thiab lub sijhawm them nqi sib xws.
Yuav ua li cas ntsuas kev tiv thaiv nrog digital multimeter
Thaum ntsuas kev tiv thaiv, kev nyeem ntawv yuav tsum tau nyeem ntawm qhov ntsuas "ω" (vim qhov tam sim no dhau los ntawm lub 'meter' tsis yog proportional to the resistance is measured, the resistance scale on the dial is uneven.) Qhov kev tiv thaiv raug ntsuas qhov tseeb tus nqi. ntawm yog sib npaug rau kev nyeem ntawv ntawm qhov ntsuas tau muab faib los ntawm ntau qhov taw qhia los ntawm lub pob qhov rooj. Ua ntej ntsuas, koj yuav tsum luv-circuit ob qhov kev xeem ua ntej, tig lub xoom-kho potentiometer kom tus pointer nyob ntawm 0ω, thiab tom qab ntawd xaiv lub iav tsim nyog kom ntsuas qhov tseeb. Txhua zaus koj hloov qhov txwv, koj yuav tsum rov pib dua qhov xoom. Tsis tas li ntawd, kev ntsuas kev tiv thaiv yuav tsum tau nqa tawm passively thiab tsis muaj lwm cov ceg sib luag. Tom qab qhov kev ntsuas tsis kam (lossis tam sim no) ua tiav, qhov hloov pauv yuav tsum tig mus rau qhov chaw siab voltage. Qhov no yog tus cwj pwm zoo los tiv thaiv kev siv tsis raug ntawm ohmmeter (lossis txoj haujlwm tam sim no) los ntsuas qhov voltage.
Kev ceev faj rau digital multimeter kuj
Teem lub digital multimeter mus rau qhov tsim nyog tsis kam, thiab cov ntawv xeem liab thiab cov tshuaj ntsuam dub coj mus kov ob tug ncej ntawm capacitor Cx nyob rau hauv qhov kev xeem feem. Lub sijhawm no, tus nqi tso tawm yuav maj mam nce los ntawm "000" kom txog thaum lub cim overflow "1" tshwm. Yog tias "000" tau tshwm sim tas li, nws qhia tau hais tias ib qho luv luv Circuit Court hauv lub capacitor; Yog tias cov dej ntws tawm tas li, nws yuav txhais tau hais tias cov ncej sab hauv ntawm lub capacitor yog qhib circuited, los yog cov qib kev xaiv tsis tsim nyog. Thaum kuaj xyuas electrolytic capacitor, thov nco ntsoov tias cov hlau lead kuaj liab (zoo them) txuas nrog qhov zoo electrode ntawm lub capacitor, thiab cov hlau lead kuaj dub txuas nrog qhov tsis zoo electrode ntawm lub capacitor.
