Plaub piav qhia txog kev kho lub taub hau multimeter faults
Fault 1: Tus pointer tsis tuaj yeem deflected. Ua ntej, xyuas lub multimeter fuse los tiv thaiv cov input fuse los ntawm kev kub hnyiab tawm thiab ua rau tsis muaj cov tswv yim tam sim no, ua rau lub ntsuas ntsuas tsis tuaj yeem deflect. Qhov thib ob, yog tias lub fuse zoo li qub, sim txhua lub zog, xws li DC voltage, AC voltage, thiab DC tam sim no, kom pom tias tus taw tes tsis tuaj yeem cuam tshuam thaum ntsuas txhua lub zog.
Yog hais tias tus pointer tsis tuaj yeem deflected thaum ntsuas rau txhua lub zog, nws qhia tau hais tias qhov txhaum yog nyob rau hauv lub 'meter' lub taub hau vim hais tias lub fuse yog zoo, tab sis tag nrho cov zog yuav siv tsis tau. Yog li ntawd, nyob rau hauv DC voltage range series voltage divider resistor, AC voltage range series voltage divider resistor, rectifier, thiab tam sim no ntau yam shunt resistor ntawm lub multimeter tsis tuaj yeem raug puas tsuaj. Yog li ntawd, yog vim li cas vim li cas tus pointer tsis txav yog vim muaj teeb meem nrog lub taub hau meter. Txoj kev tshuaj xyuas yog raws li hauv qab no:, Koj tuaj yeem ntsuas qhov tam sim no ntawm lub taub hau ntawm lub 'meter', tab sis yog tias koj pom tias muaj teeb meem, koj tuaj yeem hloov nws nrog lub taub hau ntawm lub 'meter' ntawm tib qhov loj.
Fault 2: Lub deflection amplitude ntawm tus pointer yog loj. Yog tias nws pom thaum lub sij hawm ntsuas qhov deflection amplitude ntawm tus pointer yog loj thaum ntsuas cov cim ntawm txhua lub zog, tshaj qhov tseeb ntawm qhov ntsuas, nws tau txiav txim siab tias muaj teeb meem nrog lub raj kev nyab xeeb thiab lub roj teeb sab hauv. multimeter. Yog hais tias muaj ib tug luv luv Circuit Court los yog qhib Circuit Court tshwm sim nyob rau hauv lub internal voltage divider resistor, nws yog tsim nyog los xyuas lub meter lub taub hau, tsom rau kev kuaj xyuas cov khoom, qhov sib npaug qhov hnyav txuas nrog lub pointer, thiab lub caij nplooj ntoos hlav caij nplooj ntoos hlav caij nplooj ntoos hlav, Caij nplooj ntoos hlav thiab cov plaub hau yog Cov khoom tseem ceeb ntawm kev tshuaj xyuas, vim tias txoj haujlwm ntawm cov plaub hau yog tsim cov tshuaj tiv thaiv torque los tsav lub pointer kom deflect, thiab lub zog sib nqus uas ua rau lub pointer deflect kuj hu ua rotational torque. Yog hais tias tsuas yog rotational torque, tsis muaj cov tshuaj tiv thaiv torque generated los ntawm hairspring.
Txawm hais tias lub teeb liab ntsuas loj npaum li cas, tus pointer ib txwm deflects mus rau qhov kawg. Raws li kuv tau hais ua ntej, yog tias cov plaub hau puas lawm, yuav muaj qhov sib txawv loj ntawm tus taw tes thaum ntsuas lub teeb liab, uas yog tshwm sim los ntawm kev puas tsuaj los yog softening ntawm hairspring. Koj tuaj yeem hloov cov hairspring lossis hloov lub taub hau meter los daws teeb meem.
Fault 3: Lub deflection amplitude ntawm tus pointer yog tsawg heev. Yog hais tias muaj lub teeb liab ntsuas thiab tus pointer yuav luag tsis deflect, tshem tawm cov teeb meem nrog lub fuse, tshem tawm cov roj teeb sab hauv ntawm lub multimeter, thiab tshem tawm qhov kev puas tsuaj rau lub voltage divider thiab shunt resistor nyob rau hauv lub internal Circuit Court ntawm lub multimeter. Tag nrho cov no yuav tsum tau muab tshem tawm, thiab tom qab ntawd xyuas lub taub hau meter. Ib qho txhaum nrog ib qho me me deflection amplitude feem ntau tshwm sim vim qhov poob ntawm excitation los ntawm lub hauv paus dynamic coil ntawm lub taub hau ' meter ', Vim lub sij hawm ntev tso ntawm tus pointer multimeter nyob rau hauv ib qho chaw uas muaj zog cuam tshuam los ntawm magnetic teb, sab hauv. dynamic coil ntawm magnetoelectric ntsuas lub taub hau poob hlau nplaum, ua rau qhov kev ua txhaum no tshwm sim. Lub tshuab magnetizing tuaj yeem siv los ua kom lub taub hau, thiab tau kawg, lub taub hau hloov kuj tseem siv tau
Fault 4: Thaum tus pointer deflected, nws co sab laug thiab sab xis. Qhov txhaum no yeej yooj yim heev. Qhov txhaum tshwm sim nyob rau hauv lub taub hau meter, uas yog tshwm sim los ntawm tus pointer damping ntaus ntawv nyob rau hauv lub magnetoelectric ntsuas. Lub damper puas lawm los yog kev ua haujlwm ntawm lub damper tsis zoo. Qhov kev ua txhaum no tuaj yeem kho tau los ntawm kev hloov lub taub hau meter nrog ib qho tshiab. Kev saib xyuas ntawm lub taub hau meter yog qhov yooj yim heev, tsuas yog ob peb yam.
Yog hais tias lub deflection amplitude ntawm tus pointer loj, nws feem ntau tshwm sim ntawm cov hairspring. Yog hais tias lub deflection amplitude me me, nws feem ntau tshwm sim ntawm qhov poob ntawm excitation ntawm lub txav coil thiab qhov tsis muaj peev xwm ntawm tus taw tes rau deflect. Feem ntau tshwm sim thaum lub coil tsiv thiab lub taub hau kauj raug hlawv, los yog cov plaub hau puas lawm, thiab lub pointer deflection mus rau sab laug thiab sab xis feem ntau yog tshwm sim los ntawm kev puas tsuaj rau lub damper.
