Kho cov txheej txheem thiab cov txheej txheem rau Digital Multimeters
Cov cuab yeej siv digital muaj qhov nkag siab zoo thiab raug, thiab lawv cov ntawv thov yuav luag txhua lub lag luam. Txawm li cas los xij, vim muaj ntau qhov xwm txheej ntawm nws qhov tsis raug thiab qhov siab randomness ntsib teeb meem, tsis muaj ntau txoj cai ua raws, ua rau kev kho nyuaj. Yog li ntawd, kuv tau sau qee qhov kev kho uas kuv tau sau los ntawm ntau xyoo ntawm kev ua haujlwm rau kev siv los ntawm cov npoj yaig hauv daim teb no. Lub capacitive voltage divider high voltage ntsuas qhov system yog siv rau kev ntsuas pulse high voltage, xob laim high voltage, hwj chim zaus high voltage. Nws yog ib qho kev xaiv zoo los hloov cov high-voltage electrostatic Voltmeter.
1, Kho txoj kev:
Nrhiav qhov txhaum yuav tsum pib los ntawm sab nraud thiab tom qab ntawd los ntawm sab hauv, los ntawm qhov yooj yim mus rau qhov nyuaj, tawg mus rau hauv qhov chaw, thiab tsom mus rau kev tawg. Cov txheej txheem tuaj yeem kwv yees faib ua cov hauv qab no:
1. Txoj kev xav
Los ntawm kev tso siab rau kev nkag siab ncaj qha rau kev txiav txim siab qhov ua txhaum, los ntawm kev tshuaj xyuas qhov muag, nws tuaj yeem pom tau tias xws li hlau tawg, desoldering, luv luv Circuit Court rau hauv av, tawg fuse tubes, burnt Cheebtsam, mechanical puas, tooj liab ntawv ci warping thiab breakage. ntawm cov ntawv luam tawm, thiab lwm yam; Koj tuaj yeem kov qhov kub thiab txias ntawm lub roj teeb, resistor, transistor, thiab kev sib xyaw ua ke, thiab xa mus rau daim duab kos duab los txheeb xyuas qhov ua rau qhov kub tsis zoo. Tsis tas li ntawd, koj tuaj yeem tshawb xyuas ntawm tes seb cov khoom puas yog xoob, seb cov pins sib xyaw ua ke tau ruaj ntseg, thiab seb qhov hloov pauv hloov tau daig; Nws tuaj yeem hnov thiab hnov ntxhiab tsw rau txhua lub suab txawv txav lossis tsw ntxhiab.
2. Txoj kev ntsuas hluav taws xob
Ntsuas seb qhov ua haujlwm voltage ntawm txhua lub ntsiab lus tseem ceeb yog qhov qub, thiab qhov yuam kev tuaj yeem pom sai sai. Piv txwv li, ntsuas qhov ua haujlwm voltage thiab siv voltage ntawm A / D converter.
3. Txoj kev luv luv
Txoj kev luv luv Circuit Court feem ntau yog siv rau hauv kev tshuaj xyuas ntawm A / D converters tau hais ua ntej, uas feem ntau siv los kho cov twj tsis muaj zog thiab micro hluav taws xob.
4. Txoj kev rhuav tshem Circuit Court
Tshem tawm qhov tsis txaus ntseeg los ntawm tag nrho lub tshuab lossis lub tshuab hluav taws xob. Yog tias qhov txhaum ploj lawm, nws qhia tau hais tias qhov txhaum yog nyob rau hauv lub disconnected Circuit Court. Txoj kev no yog qhov tsim nyog rau cov xwm txheej uas muaj luv luv hauv Circuit Court.
5. Kev ntsuas cov txheej txheem
Thaum qhov txhaum tau nqaim mus rau ib qho chaw lossis ntau qhov chaw, nws tuaj yeem ntsuas hauv online lossis offline. Yog tias tsim nyog, hloov nrog cov khoom zoo. Yog tias qhov txhaum ploj mus, nws qhia tau tias cov khoom puas lawm.
6. Txoj kev cuam tshuam
Siv tib neeg induced voltage raws li ib tug cuam tshuam teeb liab los soj ntsuam cov kev hloov nyob rau hauv LCD zaub, nws yog feem ntau siv los xyuas seb lub input Circuit Court thiab cov zaub ib feem puas lawm.
2, Kho cov txheej txheem:
Rau cov cuab yeej faulty, thawj kauj ruam yog los xyuas thiab paub qhov txawv ntawm qhov tshwm sim txhaum cai (tag nrho cov haujlwm tsis tuaj yeem ntsuas) lossis tus kheej (tus kheej lub luag haujlwm lossis ntau yam), thiab tom qab ntawd paub qhov txawv ntawm qhov xwm txheej thiab daws qhov teeb meem raws li.
Yog tias txhua lub zog tsis tuaj yeem ua haujlwm, qhov tseem ceeb yuav tsum tau kuaj xyuas lub zog hluav taws xob thiab A / D converter circuit. Thaum kuaj xyuas cov khoom siv hluav taws xob, tshem tawm cov roj teeb uas tau teem tseg, nias lub hwj huam hloov, txuas qhov zoo coj mus rau qhov tsis zoo ntawm lub ntsuas hluav taws xob ntsuas, thiab txuas cov hlau lead tsis zoo rau lub zog zoo (rau digital multimeter). Tig lub hloov mus rau qhov ntsuas txoj hauj lwm ntawm lub transistor thib ob. Yog hais tias cov zaub qhia tau hais tias qhov zoo voltage ntawm lub thib ob transistor, nws qhia tau hais tias lub hwj chim mov yog zoo. Yog tias qhov sib txawv loj, nws qhia tau hais tias muaj teeb meem nrog cov khoom siv hluav taws xob. Yog tias qhov qhib Circuit Court tshwm sim, tsom rau kev kuaj xyuas lub hwj chim hloov thiab cov roj teeb coj. Yog hais tias muaj ib tug luv luv Circuit Court tshwm sim, nws yog tsim nyog los siv lub Circuit Court breaker txoj kev maj mam disconnect lub Cheebtsam uas siv lub hwj chim mov, nrog rau kev tsom mus rau kev soj ntsuam kev ua hauj lwm amplifiers, timers, thiab A / D converters. Yog hais tias ib tug luv luv Circuit Court tshwm sim, nws feem ntau puas ntau tshaj ib tug integrated tivthaiv. Lub A / D converter tuaj yeem tshawb xyuas ib txhij nrog lub ntsuas qhov yooj yim, uas yog sib npaug rau DC meter taub hau ntawm analog multimeter. Txoj kev tshuaj xyuas tshwj xeeb yog:
(1) Tig qhov ntau ntawm cov ntsuas ntsuas mus rau qhov tsawg DC voltage ntau;
(2) Ntsuas seb qhov ua haujlwm voltage ntawm A / D converter yog qhov qub. Raws li A / D converter qauv siv nyob rau hauv lub rooj, sib xws rau V ntxiv tus pin thiab COM tus pin, ua qhov ntsuas qhov ntsuas raws li lawv cov nqi raug.
(3) Ntsuas qhov siv voltage ntawm A / D converter. Tam sim no, cov ntaub ntawv siv hluav taws xob uas feem ntau siv digital multimeter feem ntau yog 100mV lossis 1V, uas yog, ntsuas qhov DC voltage ntawm VREF ntxiv thiab COM. Yog tias nws deviates ntawm 100mV lossis 1V, nws tuaj yeem hloov kho los ntawm lwm lub Potentiometer.
(4) Txheeb xyuas tus lej xov tooj nrog xoom input, luv Circuit Court qhov zoo davhlau ya nyob twg IN ntxiv thiab qhov tsis zoo davhlau ya nyob twg IN - ntawm A / D converter, kom cov input voltage Vin=0, thiab cov cuab yeej qhia "{{3 }}.0" or "00.00".
(5) Txheeb xyuas qhov ci ntsa iab tag nrho ntawm lub monitor. Luv luv Circuit Court tus pin xeem ntawm qhov kev xeem kawg rau qhov zoo fais fab mov davhlau ya nyob twg V ntxiv, kom lub logic hauv av yuav muaj peev xwm thiab tag nrho cov digital circuits nres ua haujlwm. Vim tias qhov hluav taws xob DC siv rau txhua qhov mob stroke, lub ntsuas ntsuas ntsuas "1888" thiab cov ntsuas ntsuas ntsuas "18888" thaum txhua qhov strokes tau teeb. Yog tias tsis muaj mob stroke, xyuas qhov sib txuas cov zis tus pin ntawm A / D converter thiab cov nplaum nplaum (lossis thaiv), nrog rau seb puas muaj kev sib cuag tsis zoo lossis cuam tshuam ntawm A / D converter thiab cov zaub.
2. Yog tias muaj teeb meem ntawm ib tus neeg lub zog, nws qhia tau tias A / D converter thiab fais fab mov ua haujlwm zoo. Vim hais tias DC voltage thiab kuj ntau yam sib koom ua ke ntawm voltage divider resistors; AC thiab DC tam sim no sib koom shunt; AC voltage thiab AC tam sim no sib koom ua ke ntawm AC / DC converters; Lwm yam khoom xws li Cx, HFE, F, thiab lwm yam yog tsim los ntawm kev ywj pheej sib txawv converters. Nkag siab txog kev sib raug zoo ntawm lawv thiab raws li daim duab hluav taws xob, nws yog ib qho yooj yim los nrhiav qhov tsis raug. Yog tias qhov ntsuas me me tsis yog qhov tseeb lossis tus lej pom tau dhia ntau dhau, qhov tseem ceeb yuav tsum tau kuaj xyuas seb qhov kev sib cuag ntawm qhov hloov pauv yog qhov zoo.
Yog tias qhov ntsuas cov ntaub ntawv tsis ruaj khov thiab tus nqi ib txwm khaws cia, thiab lub davhlau ya nyob twg nkag ntawm A / D converter yog luv luv, thiab cov ntaub ntawv tso tawm tsis yog xoom, ces nws feem ntau yog 0.1 μ Ua los ntawm kev ua haujlwm tsis zoo ntawm F's reference capacitor.
Raws li cov kev soj ntsuam saum toj no, cov txheej txheem kho yooj yim rau digital multimeter yuav tsum yog: digital meter taub hau → DC voltage → DC tam sim no → AC voltage → AC tam sim no → tsis kam ntau (xws li buzzer thiab kuaj xyuas qhov zoo voltage poob ntawm lub raj thib ob) → Cx → HFE, F, H, T, thiab lwm yam. Tab sis nws yuav tsum tsis txhob yuav heev mechanical. Qee qhov teeb meem pom tseeb tuaj yeem daws ua ntej. Tab sis thaum ua calibration, nws yuav tsum tau ua raws li cov txheej txheem saum toj no.
Nyob rau hauv luv luv, ib tug faulty multimeter, tom qab tsim nyog kev ntsuam xyuas, thawj yuav tsum tau soj ntsuam qhov ua tau qhov chaw ntawm qhov txhaum, thiab ces nrhiav qhov txhaum qhov chaw raws li daim duab Circuit Court rau hloov thiab kho. Vim qhov tseeb tias digital multimeter yog ib qho cuab yeej meej dua, thaum hloov cov khoom siv, nws yog ib qho tsim nyog yuav tsum siv cov khoom siv nrog tib qhov tsis zoo, tshwj xeeb tshaj yog thaum hloov A / D converters. Nws yog ib qho tsim nyog yuav tsum siv cov blocks sib xyaw ua ke uas tau raug xaiv los ntawm cov chaw tsim khoom nruj me ntsis, txwv tsis pub muaj kev ua yuam kev thiab qhov yuav tsum tau ua kom raug yuav tsis ua tiav. Cov hloov tshiab A / D hloov tshiab kuj yuav tsum tau kuaj xyuas raws li txoj kev tau hais ua ntej, thiab yuav tsum tsis txhob ntseeg vim nws qhov tshiab.
