Cov lus qhia rau Safe Multimeter Capacitance Measurement
Ua ntej ntsuas, lub hwj chim yuav tsum raug txiav tawm thiab tawm. Cov txheej txheem ntawm kev tso tawm yog nrhiav cov khoom siv hlau xws li lub hau ntswj, tuav qhov cuam tshuam ntawm cov hlau ntawm cov khoom siv insulating thiab ntes ob txhais taw ntawm lub ntsuas ntsuas capacitor. Siv lub digital multimeter los ntsuas qhov capacitance. Nrhiav lub capacitor thaiv, tom qab ntawd muab ob lub pins ntawm lub capacitor rau hauv lub qhov (socket) ntsuas capacitance tom qab lub capacitor raug tso tawm, thiab tos rau kev nyeem ntawv ntawm lub vijtsam LCD kom ruaj khov. Tus nqi tiag tiag yog lub peev xwm ntawm sab capacitor. Yog tias koj xav ntsuas qhov xau, koj tuaj yeem siv qhov tsis kam ntawm tus pointer multimeter. Thaum ntsuas, lub peev xwm me me tuaj yeem muab tso rau hauv RX1K lossis RX100. Thaum ntsuas cov zaub ntawm lub dial, thaum ob lub xeem coj txuas nrog ob txhais taw ntawm lub capacitor, tus pointer yuav deflect clockwise, thiab tom qab ntawd lub capacitor yuav raug them tag nrho. Thaum cov dej ntws tam sim no, txhais tes yuav rov qab mus rau infinity counterclockwise. Lub kaum sab xis loj dua, lub peev xwm loj dua. Thaum lub sij hawm deflection txheej txheem, ob txhais tes yuav tsum viav vias ntawm qhov ceev ceev kom lawv rov qab mus rau infinity. Nws pib qhia tau hais tias lub capacitor tsis muaj qhov to. Ib txoj hauj lwm uas lub koob dheev qeeb qeeb los yog tsis rov qab los, qhia tias lub capacitor tau xau hauv ib ntu. Yog hais tias nws qhia infinity thaum kawg, nws txhais tau hais tias tsis muaj to. Los yog saib cov yam ntxwv ntawm oscilloscope, uas yog tsis yooj yim sua rau cov neeg zoo tib yam. Kuj tseem muaj lub capacitor uas muaj qhov ntsuas hluav taws xob tiv taus. Tus nqi hluav taws xob tiv taus ntawm electrolytic capacitor feem ntau yog sau rau ntawm nws. Qee cov ceramic capacitors tsis tau cim rau saum thiab yuav tsum tau them sai sai rau thaum xaiv.
