Siv lub multimeter kom paub qhov txawv ntawm PNP thiab NPN sensors
PNP-type sensors thiab NPN-type sensors ua haujlwm los ntawm kev siv lub saturation thiab txiav tawm ntawm lub transistor, yog li lawv yog ob qho tib si hloov sensors. Feem ntau siv yog PNP hom sib thooj keyboards thiab NPN hom sib thooj keyboards, PNP hom sensors yog qib siab tso zis sensors, thaum NPN hom sensors yog qib qis tso zis sensors. Yog li ntawd, ob hom sensors nyob rau hauv qhov tseeb xov yuav tsum tau them sai sai rau. Xws li kev hloov pauv sensors feem ntau muaj peb cov hlau lead, raws li, lub zog hluav taws xob VCC, 0V kab, cov kab hluav taws xob tso tawm.
Nrog lub multimeter kom paub qhov txawv ntawm ob hom sensors yog qhov yooj yim heev. Cov kab hluav taws xob tso tawm nrog lub zog hluav taws xob VCC kev coj ua thiab kev ua haujlwm yog PNP-hom sensors, teeb liab tawm kab nrog 0V kab kev coj ua thiab kev ua haujlwm yog NPN-hom sensors.
Piv txwv li, 24VDC fais fab mov hloov sensors, PNP-hom lossis NPN-type sensors xa 24VDC fais fab mov, lub multimeter mus rau DC voltage iav. Koj tuaj yeem txiav txim seb nws puas yog PNP-hom sensor lossis NPN-type sensors tuaj yeem txiav txim siab seb nws puas yog ib txwm qhib lossis ib txwm kaw hom hloov pauv hom sensors.
Ua ntej ntawm tag nrho cov, tsis txhob muab lawv ib tug trigger teeb liab, nrog ib tug multimeter cwj mem rau lub teeb liab tso zis kab tsis txav, lwm tus cwj mem tau txuas nrog VCC kab thiab {{0}}V kab. Yog tias cov kab hluav taws xob tso tawm nrog VCC fais fab kab nruab nrab ntawm 24VDC voltage, koj tuaj yeem txiav txim siab qhov hloov pauv no rau NPN ib txwm kaw hom sensor, yog tias cov txiv hmab txiv ntoo nrog 0V kab ntawm 24VDC voltage, yog PNP ib txwm kaw hom sensor.
Muab nws ib lub teeb liab, multimeter ntsuas txoj kev yog tib yam. Yog tias muaj 24VDC qhov hluav taws xob nruab nrab ntawm cov kab hluav taws xob tso tawm thiab VCC, qhov kev hloov pauv no yog NPN nquag qhib sensor, thiab yog tias muaj 24VDC qhov hluav taws xob nruab nrab ntawm cov kab hluav taws xob tso tawm thiab 0V kab, qhov sensor no yog PNP ib txwm qhib. sensor. Nws yog qhov yooj yim heev los txiav txim siab seb hom kev hloov pauv sensor lawv nyob li cas, tsuav koj muaj multimeter koj tuaj yeem daws ntau qhov tsis ntseeg.
