Vim li cas thiaj tsis tuaj yeem siv cov duab digital ntawm lub vijtsam digital multimeter?
Thaum qhov no tshwm sim, feem ntau muaj ob txoj hauv kev. Ib qho yog tias qhov kev xeem coj thiab cov lus nkag ntawm qhov ntsuas ntsuas tsis raug, ua rau cov khoom siv analog-rau-digital converter hauv multimeter tsis tuaj yeem nyeem cov teeb liab; Lwm qhov yog tias qhov analog-rau-digital converter hauv lub multimeter puas lawm. Hauv qab no peb qhia ob qhov xwm txheej no raws li.
1. Ceev ceev txiav txim qhov zoo ntawm multimeter's analog-to-digital converter
Tus neeg nug tau hais tias muaj qhov tso rau ntawm cov zaub tab sis cov haujlwm tsis tuaj yeem siv. Yog hais tias cov ntaub ntawv tso tawm ntawm cov zaub yog nkig thiab cov lej tso tawm los ntawm multimeter tsis hloov thaum lub multimeter yog siv los ntsuas qhov tsis xws li voltage thiab tsis kam, ces peb yuav tsum xav txog seb lub analog-rau-digital converter hauv puas lawm. Ntawm no peb coj cov analog-rau-digital converter ICL7106, uas yog feem ntau siv nyob rau hauv zoo tib yam 3½-digit digital multimeters, ua piv txwv los qhia qhov kev txiav txim ceev ntawm qhov zoo ntawm analog-to-digital converter. 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 2.8 ~ 3.0V ntawm V + davhlau ya nyob twg (pin 1) thiab COM davhlau ya nyob twg (pin 32) ntawm ICL7106, thiab qhov hluav taws xob no yuav tsis hloov nrog kev hloov ntawm multimeter roj teeb voltage, yog li peb tsuas yog yuav tsum tau siv Lwm lub tshuab ntsuas qhov 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 heev los ntawm cov saum toj no voltage, nws yeej yuav txiav txim tau hais tias muaj teeb meem nrog lub analog-rau-digital converter los yog nws peripheral Cheebtsam. Lub sijhawm no, koj tuaj yeem tshawb xyuas cov khoom sab nraud ntawm ICL7106, thiab tom qab ntawd txiav txim siab seb ICL7106 puas.
2. Kev txiav txim ntawm multimeter cwj mem thiab input channel faults
Tom qab lees paub tias tsis muaj teeb meem nrog lub analog-rau-digital converter ntawm digital multimeter, koj tuaj yeem ua ntej kho qhov hloov pauv mus rau DC 200mV txoj hauj lwm kom pom tias tus lej tshwm rau ntawm cov zaub yog "000.0", thiab kho nws mus rau qhov chaw tiv thaiv kom pom tias tus lej tso tawm yog "000.0". 1 "Yog tias qhov hloov pauv hloov pauv thiab tus lej pom tau hloov pauv, nws txhais tau hais tias qhov kev xeem cov hlau lead yog kev sib txuas sab hauv. Lub sijhawm no, koj tuaj yeem siv qhov kev tawm tsam lossis buzzer teeb tsa los txiav txim siab qhov kev xeem twg muaj teeb meem. Cov digital multimeter's 200mA thiab hauv qab qhov tam sim no cov khoom siv hluav taws xob muaj lub fuse hauv series Yog tias lub fuse tawg, qhov ntau yam tam sim no yuav siv tsis tau.
