Kev kho ntawm multimeter Circuit Court faults:
Fault 1: Lub input fuse 250V/0}.5A raug hlawv, ua rau tsis muaj cov tswv yim tam sim no thiab txhua lub zog siv tsis tau. Qhov kev ua txhaum no suav hais tias yog qhov yooj yim tshaj plaws hauv lub rooj kho. Vim yog siv tsis raug, siv cov iav tam sim no los ntsuas qhov hluav taws xob lossis siv cov iav tiv thaiv los ntsuas qhov hluav taws xob tuaj yeem ua rau cov khoom siv hluav taws xob hlawv tawm, uas ua rau tsis muaj qhov cuam tshuam tam sim no, txoj kev saib xyuas yog yooj yim heev. Disassemble lub multimeter thiab kuaj lub input fuse. Nws pom tias lub fuse tau raug hlawv. Hloov nws nrog lub fuse ntawm tib tus qauv thiab cov lus qhia tshwj xeeb. Kho qhov txhaum. Lub fuse ntawm 47 hom 'meter' muaj qhov tshwj xeeb ntawm 250V / 0.5A
Fault 2: Ob lub rectifier diodes nyob rau hauv ib nrab nthwv dej rectification Circuit Court ntawm lub rectifier nyob rau hauv AC voltage ntau yam muaj breakdown los yog qhib Circuit Court tshwm sim. Peb paub lub hauv paus ntsiab lus ntawm kev ntsuas ntawm tus pointer multimeter nyob rau hauv AC voltage ntau: qhov kev ntsuas ntau yog nthuav los ntawm kev sib txuas nrog cov resistors nyob rau hauv series los faib cov voltage. Ib nrab nthwv dej rectification Circuit Court rectifies AC teeb liab rau hauv DC teeb liab thiab ntws los ntawm lub taub hau meter rau kev ntsuas, Txij li thaum lub taub hau ntawm pointer multimeter yog DC Ammeter, uas tsis tuaj yeem ntws los ntawm AC teeb liab, nws yog ib qho tsim nyog yuav tsum tau ntxiv ib nrab. yoj rectifier Circuit Court nyob rau hauv AC voltage ntau raws li ib tug rectifier hloov lub AC teeb liab mus rau hauv ib tug DC teeb liab thiab ntws los ntawm lub meter taub hau rau kev ntsuas. Yog li ntawd, thaum ntsuas lub zog AC, nws yuav tsum tau kho ib zaug los ntawm lub diode rectifier.
Yog tias AC lub zog ntsuas tau ntev, lub diode rectifier feem ntau yuav cuam tshuam los ntawm AC cov teeb liab thiab yuav ntsib kev qhib lossis luv luv, uas yog qhov kev zam. Yog li ntawd, yog tias koj ntsib ib qho teeb meem uas AC voltage ntau ntawm tus pointer multimeter tsis tuaj yeem siv, ua ntej kos lub raj kev nyab xeeb. Vim tias lub raj muaj kev nyab xeeb raug kub hnyiab, nws yuav ua rau tsis muaj kev tawm tswv yim tam sim no, thiab rab koob ntsuas ntsuas yuav tsis txav mus. Yog tias lub raj muaj kev ruaj ntseg zoo li qub thiab AC voltage ntau yam tseem siv tsis tau, Koj yuav tsum xub xyuas qhov voltage divider hauv AC voltage range kom pom tias muaj qhov nce lossis txo qhov tsis kam ntawm qhov voltage divider.
Yog tias AC voltage ntau yam tseem siv tsis tau tom qab hloov nws ua ntej thiab txiav txim siab tawm qhov kev puas tsuaj rau qhov hluav taws xob faib hluav taws xob, lub hom phiaj yuav tsum yog los ntawm kev tshuaj xyuas qhov ntsuas rau pem hauv ntej thiab thim rov qab ntawm ob lub rectifier diodes hauv ib nrab nthwv dej rectifier Circuit Court hauv AC voltage ntau. los tiv thaiv kev tawg lossis qhib Circuit Court ntawm lub rectifier diodes los ntawm kev ua haujlwm tsis zoo ntawm AC voltage ntau yam siv tsis tau. Yog tias muaj kev tawg lossis qhib Circuit Court hauv cov yeeb nkab, hloov cov yeeb nkab tib yam los kho qhov txhaum sai sai.
Fault 3: Kev ntsuas tsis raug ntawm cov iav tiv thaiv thiab tsis muaj peev xwm siv cov iav tiv thaiv. Vim qhov tsis tshua muaj hluav taws xob ntawm 9V thiab 1.5V roj teeb, qhov ntsuas tsis raug. Lub roj teeb tau hloov kho, thiab cov iav tiv thaiv tsis tuaj yeem ntsuas. Vim yog cov hlau tawg lossis cov pob qij txha hauv cov xov hluav taws xob ntawm 9V thiab 1.5V roj teeb, qhov txhaum tau raug kuaj xyuas thiab kho. Tus qauv tsis kam ntawm cov iav tiv thaiv tau qhib, ua rau cov iav tiv thaiv tsis tuaj yeem siv tau.
Fault 4: Kev sib cuag ntawm tus txhuam hniav thiab lub rooj tsav xwm Circuit Court yog xoob, ua rau qee yam iav lossis lwm yam iav tsis tuaj yeem ntsuas, thiab tus taw tes tsis tuaj yeem deflect. Txoj kev txij nkawm yog yooj yim. Tshem lub multimeter, reinstall tus txhuam hniav, thiab ntxuav lub Circuit Court board ua ntej txhim kho tus txhuam. Qhov kev ua txhaum no yog qhov yooj yim heev, tshwm sim los ntawm kev sib cuag tsis zoo ntawm cov txhuam hniav thiab lub rooj tsav xwm hauv Circuit Court.
Fault 5: Lub shunt resistor nyob rau hauv lub tam sim no ntau burns tawm. Peb paub tias tus nqi ntawm shunt resistor nyob rau hauv qhov tam sim no kuj yog me me, xws li los ntawm ob peb puas ohms mus rau ntau kaum ntawm ohms. Yog tias qhov tam sim no siv tsis raug los ntsuas qhov ntsuas hluav taws xob, nws yog qhov sib npaug ntawm lub zog hluav taws xob luv luv, uas ua rau hluav taws xob luv luv thiab ncaj qha hlawv tawm ntawm shunt resistor. Qhov no yuav tsum tau muab sau tseg.
Fault 6: Cov iav tiv thaiv tsis yog xoom kom raug. Xyuas seb lub roj teeb hluav taws xob puas tsawg thiab lub roj teeb zoo li qub. Tshawb xyuas cov kab hluav taws xob. Cov kab hluav taws xob yog qhov qub. Nyob rau hauv lub neej yav tom ntej, cov iav tiv thaiv tsis yog xoom kom raug. Txheeb xyuas tus qauv tsis kam. Yog tias tus qauv tsis kam yog qhov qub thiab qhov zeroing tsis raug, kho lub Potentiometer los ntawm kev ntsuas qhov deflection tam sim no ntawm lub taub hau meter. Yog tias qhov zeroing tseem ua tsis tau, nws yog qhov txhaum ntawm ohmic zeroing circuit. Ua ntej kos lub Potentiometer. Yog hais tias lub Potentiometer zoo li qub, xyuas cov xaim ntawm Potentiometer, Yog tias cov xaim zoo li qub, thaum kawg xyuas cov kev hloov kho tau txuas nrog Potentiometer. Qhov txhaum yuav tshwm sim los ntawm qhov nce lossis txo tus nqi ntawm qhov kev hloov kho tau. Tom qab kuaj xyuas, hloov nws thiab kho nws.
Fault 7: Lub AC thiab DC voltage divider resistors raug hlawv tawm. Peb paub tias qhov tseem ceeb ntawm cov hluav taws xob hluav taws xob faib hluav taws xob yog qhov siab, xws li DC 1000V txuas nrog 10M divider resistors 500V txuas nrog 5M 250V txuas nrog 4M 50V txuas nrog 800K 10V txuas nrog 150K. Qhov tseem ceeb ntawm AC voltage divider resistors 1000V txuas nrog 2M 500V txuas nrog 1M 250V txuas nrog 800K yog qhov siab thiab tsis yooj yim puas. Yog tias qhov hluav taws xob faib hluav taws xob qis dua 10V ntau yam siv tsis raug, siv lub iav qis dua 10V ntau yam los ntsuas qhov hluav taws xob siab, 1: Cov khoom siv hluav taws xob yuav raug hlawv. 2: Lub voltage divider resistor yog ib qho yooj yim mus hlawv tawm, thiab qhov no yuav tsum tau ua tib zoo xyuas.
