Dab tsi yog qhov tsis zoo ntawm lub vijtsam digital multimeter muaj cov khoom siv digital thiab tsis tuaj yeem siv nws
Dab tsi yog qhov tsis zoo ntawm lub vijtsam digital multimeter muaj cov khoom siv digital thiab tsis tuaj yeem siv nws
Feem ntau muaj ob txoj hauv kev rau qhov xwm txheej no tshwm sim. Ua ntej, muaj kev ua haujlwm tsis zoo nyob rau hauv cov tswv yim channel ntawm kev sojntsuam thiab ntsuas qhov ntsuas, ua rau analog-rau-digital converter hauv multimeter tsis tuaj yeem nyeem cov teeb liab; Qhov thib ob qhov teeb meem yog hais tias lub internal analog-to-digital converter ntawm lub multimeter yog puas. Cia peb qhia ob qhov xwm txheej no sib cais.
1. Kev txiav txim ceev ntawm qhov zoo ntawm multimeter analog-to-digital converter
Tus neeg nug tau hais tias lub vijtsam zaub muaj cov zaub thiab cov haujlwm tsis siv tau. Yog tias cov ntaub ntawv tso tawm ntawm qhov screen tsis muaj teeb meem thiab siv multimeter los ntsuas qhov ntsuas tsis zoo xws li qhov hluav taws xob thiab qhov tsis kam, cov lej tso tawm ntawm lub multimeter yuav tsis hloov. Nyob rau ntawm no, peb yuav tsum xav tias seb tus analog-rau-digital converter sab hauv yog faulty. Ntawm no, nrog rau qhov ib txwm muaj 3 ½ Noj ICL7106, feem ntau siv analog-rau-digital converter rau digital multimeter, ua piv txwv, los qhia qhov kev txiav txim ceev ntawm qhov zoo ntawm analog-rau-digital converters. Raws li pom hauv daim duab saum toj no, nws yog 200mV DC voltmeter tsim los ntawm ICL7106. Thaum lub sijhawm ua haujlwm ib txwm muaj, muaj qhov ruaj khov voltage ntawm 2. multimeter. Yog li ntawd, peb tsuas yog yuav tsum tau siv lwm lub tshuab ntsuas hluav taws xob los ntsuas qhov voltage ntawm tus pin 1 thiab tus pin 32 ntawm ICL7106 kom pom tias nws yog tus nqi saum toj no. Yog hais tias qhov ntsuas voltage deviates ho los ntawm cov saum toj no voltage, Yeej, nws muaj peev xwm txiav txim tau hais tias muaj teeb meem nrog lub analog-rau-digital converter los yog nws peripheral Cheebtsam. Nyob rau ntawm lub sijhawm no, koj tuaj yeem tshawb xyuas cov khoom sab nraud ntawm ICL7106, thiab tom qab ntawd txiav txim siab seb lub tshuab hluav taws xob puas puas lawm.
2. Kev kuaj mob ntawm multimeter sojntsuam thiab input channel faults
Tom qab lees paub tias tsis muaj teeb meem nrog lub analog-rau-digital converter ntawm cov digital multimeter, koj tuaj yeem ua ntej kho qhov hloov pauv mus rau DC 200mV txoj hauj lwm kom pom tias tus lej tso rau ntawm qhov screen yog " 000.0", thiab tom qab ntawd kho nws mus rau qhov chaw tiv thaiv kom pom tias tus lej pom yog "1". Yog tias koj tig qhov hloov pauv ntau thiab cov lej pom hloov pauv, nws txhais tau hais tias cov xov hlau sab hauv ntawm qhov ntsuas tau tawg. Lub sijhawm no, koj tuaj yeem siv qhov kev tiv thaiv lossis buzzer ntau los txiav txim siab qhov kev sojntsuam twg yog qhov tsis raug. Tsis tas li ntawd, muaj ib lub fuse nyob rau hauv lub input davhlau ya nyob twg ntawm qhov tam sim no ntau yam ntawm 200mA thiab hauv qab ntawm lub multimeter digital. Yog tias qhov fuse no hlawv tawm, nws yuav ua rau qhov tam sim no siv tsis tau.
