Kev faib tawm ntawm ntau hom Digital Multimeters
Kuv ntseeg tias ntau tus neeg paub txog diodes, uas tuaj yeem kuaj tau siv cov diode ntau ntawm multimeter. Multimeters muab faib ua pointer type thiab digital type multimeters. Yuav ua li cas khiav lawv tshwj xeeb? Nyob rau hauv tsab xov xwm no, tus editor yuav piav qhia meej: 1. Thaum siv lub pointer hom multimeter los ntsuas qhov kev tiv thaiv pem hauv ntej ntawm lub diode, qhov kev sojntsuam dub yuav tsum txuas nrog lub davhlau ya nyob twg zoo ntawm lub diode, thiab cov kev sojntsuam liab yuav tsum txuas nrog qhov tsis zoo ntawm lub diode. Tom qab hloov qhov kev sojntsuam, qhov rov qab tsis kam ntawm diode tuaj yeem ntsuas. Kev tiv thaiv ntau yam ntawm kev ua haujlwm rau pem hauv ntej ntawm cov diodes zoo tib yam feem ntau yog 3-8K Ω, thiab qhov kev tawm tsam ntawm qhov rov qab yuav tsum tsis muaj kawg. Kev tshawb pom ntawm txoj kev: Muab lub multimeter nyob rau hauv "Rx1k" txoj hauj lwm, txuas cov dub sojntsuam mus rau qhov zoo davhlau ya nyob twg diode RM11 thiab lub liab sojntsuam rau nws tsis zoo davhlau ya nyob twg. Kev ntsuas rau pem hauv ntej kuj yog hais txog 7.2k Ω, raws li qhia hauv daim duab 1; Muab lub multimeter nyob rau hauv "Rx10k" txoj hauj lwm thiab sib pauv cov probes los ntsuas qhov kev tiv thaiv ntawm nws cov reverse resistor, uas yog infinite, raws li qhia nyob rau hauv daim duab 2. Yog hais tias qhov kev tiv thaiv ntawm pem hauv ntej resistor yog siab dhau los yog infinite, nws qhia tau hais tias lub diode muaj ib tug siab ntawm kuj los yog qhib Circuit Court; Yog hais tias qhov kev tiv thaiv ntawm qhov rov qab resistor me dhau los yog xoom, nws qhia tau hais tias lub diode tau tawg los yog tawg.
Nyob ntawm txoj kev tshuaj xyuas. Raws li pom nyob rau hauv daim duab, tso lub multimeter nyob rau hauv "Rxl" txoj hauj lwm thiab ntsuas lub pem hauv ntej kuj ntawm lub diode. Qhov kev tiv thaiv yuav tsum yog tshaj kaum ohms, thaum lub zog ntawm qhov rov qab resistor yuav tsum yog infinite. Yog hais tias qhov kev tiv thaiv ntawm lub pem hauv ntej resistor yog siab dhau lawm, nws qhia tau hais tias lub diode muaj ib tug siab ntawm kuj los yog ib tug qhib Circuit Court; Yog hais tias qhov kev tiv thaiv ntawm qhov rov qab resistor me dhau los yog xoom, nws qhia tau hais tias lub diode tau tawg los yog tawg lawm . 2. Thaum siv lub tshuab multimeter los ntsuas lub diode, lub diode iav yuav tsum tau siv ua ntej.
Txuas lub xov tooj liab mus rau qhov zoo davhlau ya nyob twg ntawm lub diode thiab qhov kev sojntsuam dub rau qhov tsis zoo ntawm lub diode. Qhov ntsuas tus nqi yog nws qhov kev xa hluav taws xob rau pem hauv ntej; Tom qab swapping lub probes, qhov rov qab conduction voltage poob ntawm lub diode tuaj yeem ntsuas, uas feem ntau yog infinite. Muaj ob txoj hauv kev txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws, nws muaj ob txoj hauv kev los ntsuas cov diodes uas siv lub tshuab digital multimeter: tshem tawm cov khoom siv hluav taws xob thiab ntsuas qhov ntsuas hluav taws xob. Txawm li cas los xij, tsis hais txog txoj kev tshawb nrhiav, lub multimeter yuav tsum tau muab tso rau hauv "diode" txoj haujlwm.
Thaum kuaj pom cov diodes zoo tib yam sab nraum txoj kev, tso cov digital multimeter nyob rau hauv txoj hauj lwm "diode", txuas lub xov tooj liab mus rau qhov zoo ntawm lub diode, thiab txuas cov dub sojntsuam mus rau qhov tsis zoo ntawm lub diode. Nyob rau lub sijhawm no, qhov tso tawm qhov hluav taws xob poob ntawm qhov screen yog "0.5 ~ 0.7", raws li qhia hauv daim duab (a); Tom qab hloov cov probes, qhov conduction voltage nco tus nqi yog infinite (feem ntau cov multimeters tso saib "1", ob peb zaub "OL"), raws li qhia nyob rau hauv daim duab (b). Yog tias muaj qhov sib txawv tseem ceeb hauv qhov tseem ceeb thaum kuaj, nws qhia tau tias qhov ntsuas diode puas lawm.
