Yuav ua li cas paub qhov txawv ntawm PNP thiab NPN sensors nrog multimeter
PNP-type sensors thiab NPN-type sensors siv lub saturation thiab txiav tawm lub xeev ntawm triode ua hauj lwm, yog li lawv tag nrho cov nyob rau hauv lub switching nqi sensor. Feem ntau siv yog PNP hom sib thooj keyboards thiab NPN hom sib thooj keyboards. PNP-type sensors yog cov khoom siv hluav taws xob siab, thaum NPN-hom sensors yog cov khoom siv qis qis. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov tseeb thaiv ntawm ob lub sensors. Hom kev hloov pauv no feem ntau muaj peb lub xaim hlau, uas yog lub zog hluav taws xob VCC, 0V kab, thiab cov kab hluav taws xob tso tawm.
Nws yog qhov yooj yim heev kom paub qhov txawv ntawm ob lub sensors nrog multimeter. Cov kab hluav taws xob tso tawm tau txuas nrog lub zog hluav taws xob VCC thiab ua haujlwm raws li PNP sensor, thiab cov teeb liab tso tawm kab txuas nrog rau 0V kab los ua haujlwm raws li NPN sensor.
Piv txwv li, ib tug hloov sensor nrog 24VDC fais fab mov, xa 24VDC fais fab mus rau PNP los yog NPN sensor, thiab tig lub multimeter mus rau lub iav ntawm DC voltage. Nws tuaj yeem txiav txim siab seb nws puas yog PNP hom sensor lossis NPN hom sensor, thiab nws tuaj yeem txiav txim siab seb nws yog hom qhib ib txwm lossis ib txwm kaw hom hloov hom sensor.
Tsis txhob muab lub cim taw qhia rau lawv ua ntej, txuas ib tus cwj mem ntawm multimeter mus rau lub teeb liab tso zis kab tsis txav, thiab txuas lwm tus cwj mem rau VCC kab thiab {{0}}V kab raws li. Yog tias muaj 24VDC qhov hluav taws xob nruab nrab ntawm cov kab hluav taws xob tso tawm thiab VCC fais fab kab, nws tuaj yeem txiav txim siab tias qhov hloov pauv sensor yog NPN ib txwm kaw sensor. Yog tias muaj 24VDC qhov hluav taws xob nruab nrab ntawm cov kab hluav taws xob tso tawm thiab 0V kab, nws yog PNP ib txwm kaw sensor.
Muab nws lub teeb liab, tib yam li txoj kev ntsuas multimeter. Muaj 24VDC qhov hluav taws xob nruab nrab ntawm qhov ntsuas qhov ntsuas hluav taws xob thiab VCC. Qhov no hloov sensor yog NPN ib txwm qhib sensor. Muaj 24VDC qhov hluav taws xob nruab nrab ntawm qhov ntsuas qhov ntsuas hluav taws xob thiab 0V kab. Lub sensor no yog PNP ib txwm qhib sensor. Nws yog qhov yooj yim heev los txiav txim seb hom hloov pauv sensors lawv nyob li cas. Tsuav koj muaj multimeter, koj tuaj yeem daws tau ntau qhov kev tsis ntseeg.
