General Techniques for Troubleshooting Digital Multimeters
Ib qho digital multimeter yog ib qho ntsuas ntsuas uas siv lub hauv paus ntsiab lus ntawm analog / digital hloov pauv los hloov cov nqi ntsuas mus rau qhov muaj nuj nqis digital thiab tso saib cov txiaj ntsig ntsuas hauv daim ntawv digital. Piv nrog rau tus pointer multimeter, cov multimeter digital muaj qhov zoo ntawm qhov siab precision, ceev ceev, loj input impedance, cov zaub, nyeem kom raug, muaj peev xwm tiv thaiv kev cuam tshuam, thiab qib siab ntawm kev ntsuas automation, yog li nws yog dav siv. Txawm li cas los xij, yog tias siv tsis raug, nws yooj yim ua rau tsis ua haujlwm.
Kev daws teeb meem digital multimeter feem ntau yuav tsum pib nrog lub hwj chim mov. Piv txwv li, tom qab tig lub hwj chim, yog tias cov kua siv lead ua kua cell qhia, koj yuav tsum xub xyuas seb qhov voltage ntawm 9V laminated roj teeb yog tsawg dhau; seb lub roj teeb txhuas puas raug txiav tawm. Nrhiav qhov txhaum yuav tsum ua raws li qhov kev txiav txim ntawm "thawj sab hauv thiab tom qab sab nraud, thawj zaug yooj yim thiab tom qab ntawd nyuaj". Kev daws teeb meem digital multimeter tuaj yeem ua tiav raws li hauv qab no.
1. Kev tshuaj xyuas qhov tshwm sim. Koj tuaj yeem kov lub roj teeb, resistors, transistors, thiab cov blocks sib xyaw kom pom tias qhov kub thiab txias siab dhau lawm. Yog tias lub roj teeb uas tau nruab tshiab sov, lub voj voog yuav luv luv. Nyob rau hauv tas li ntawd, lub Circuit Court yuav tsum tau soj ntsuam rau disconnection, desoldering, mechanical puas, thiab lwm yam.
Thib ob, kuaj xyuas qhov ua haujlwm voltage ntawm txhua qib. Tshawb xyuas qhov ua haujlwm voltage ntawm txhua qhov taw tes thiab sib piv nrog tus nqi ib txwm muaj. Ua ntej, xyuas qhov tseeb ntawm qhov siv voltage. Nws yog qhov zoo tshaj plaws los siv digital multimeter ntawm tib tus qauv lossis zoo sib xws los ntsuas thiab sib piv.
3. Kev tsom xam Waveform. Siv lub tshuab hluav taws xob oscilloscope los soj ntsuam qhov voltage waveform, amplitude, lub sij hawm (frequency), thiab lwm yam ntawm txhua qhov tseem ceeb ntawm lub voj voog. Piv txwv li, yog tias lub moos oscillator pib vibrate, seb qhov oscillation zaus yog 40kHz. Yog hais tias lub oscillator tsis muaj cov zis, nws txhais tau hais tias lub internal inverter ntawm TSC7106 puas, los yog lwm yam khoom yuav qhib. Saib xyuas tias lub waveform ntawm tus pin {21} ntawm TSC7106 yuav tsum yog 50Hz square nthwv dej, txwv tsis pub, sab hauv 200 zaus sib faib yuav raug puas tsuaj.
4. Kev ntsuas qhov ntsuas qhov ntsuas. Rau cov khoom nyob rau hauv qhov kev ua txhaum ntau, ua kev ntsuas hauv online lossis offline, thiab txheeb xyuas qhov ntsuas qhov tseem ceeb. Thaum ntsuas kev tiv thaiv hauv online, qhov cuam tshuam ntawm cov khoom sib txuas ua ke nrog nws yuav tsum tau txiav txim siab.
5. Kev daws teeb meem zais. Nkaum faults hais txog qhov txhaum uas tshwm sim thiab ploj mus ib ntus, thiab ntsuas qhov zoo thiab qhov tsis zoo. Qhov kev ua tsis tiav no yog qhov nyuaj dua, thiab cov laj thawj feem ntau suav nrog kev vuam tsis muaj zog ntawm cov pob qij txha, xoob, xoob cov khoom sib txuas, kev sib cuag tsis zoo ntawm cov hloov pauv hloov, kev ua haujlwm tsis ruaj khov ntawm cov khoom, thiab kev tawg ntawm cov hlau txuas txuas ntxiv. Tsis tas li ntawd, nws kuj suav nrog qee yam sab nraud. Piv txwv li, ambient kub siab dhau lawm, cov av noo siab dhau lawm, los yog muaj cov teeb liab cuam tshuam muaj zog nyob ze.
