Pointer multimeter ntes capacitance
(1) muaj peev xwm ntawm 0. ntawm lub multimeter tau nyob rau hauv kev sib cuag nrog lub capacitor ob lub pins, soj ntsuam cov kev hloov nyob rau hauv lub multimeter pointer, raws li qhia nyob rau hauv daim duab 1. Yog hais tias tus cwj mem txuas nrog rau lub caij, lub multimeter pointer mus rau sab xis me me viav vias, thiab ces rov qab mus rau infinity, hloov tus cwj mem, thiab tom qab ntawd ntsuas dua, tus pointer kuj hloov mus rau sab xis tom qab rov qab mus rau qhov tsis muaj tseeb, koj tuaj yeem txiav txim siab tias lub capacitor yog qhov qub; Yog hais tias tus cwj mem txuas nrog rau lub sijhawm no, lub multimeter pointer swings mus rau thaj tsam ntawm "0", koj tuaj yeem txiav txim siab tias lub capacitance puas tawg lossis tawg loj heev; Yog tias tus cwj mem txuas nrog lub sijhawm no, lub ntsuas ntsuas multimeter swings mus rau "0", koj tuaj yeem txiav txim siab tias lub capacitance puas tawg lossis tawg loj heev; Yog hais tias tus cwj mem txuas nrog rau lub sijhawm no, lub pointer viav vias tsis rov qab mus rau infinity, nws tuaj yeem txiav txim siab tias lub capacitor to; Yog hais tias ob lub multimeter pointer tsis viav vias, nws tuaj yeem txiav txim siab tias lub capacitor tau qhib-circuit.
(2) muaj peev xwm tsawg dua 0.01 pF ntawm kev ruaj ntseg capacitance nrhiav kom pom ntawm 10pF hauv qab lub me me capacitance, vim lub peev xwm capacitance tsawg dhau, yog li kev ntsuas nrog multimeter, tsuas tuaj yeem kuaj xyuas seb puas muaj qhov xau. , nyob rau hauv luv luv-circuit los yog tawg tshwm sim: kev ntsuas ntawm qhov kev xaiv ntawm lub multimeter R × 10k block, yuav yog ob tug cwj mem tau txuas nrog lub capacitance ntawm ob pins, tus nqi kuj yuav tsum infinity. Yog tias qhov ntsuas tsis kam yog xoom, nws tuaj yeem txiav txim siab tias lub capacitor leakage puas lossis sab hauv tawg.
(3) xeem 10pF ~ 0.01; tF tsau capacitance tuaj yeem siv raws li hauv qab no. Yuav hloov kho mus rau multimeter R × 10k block, kev xaiv ntawm ob lub xov xwm tus nqi ntau dua 100 transistor 3DC6 (los yog 9013) muaj li ntawm ib lub raj sib txuas, Circuit Court siv lub amplification ntawm lub raj sib txuas, ntsuas capacitance ntawm lub charger tam sim no. yuav tsum amplified, thiaj li yuav ua rau kom lub oscillation amplitude ntawm lub multimeter pointer. Lub ntsuas capacitance txuas nrog lub hauv paus ntawm lub raj sib xyaw b thiab cov khoom sib sau c ntawm cov cwj mem liab thiab dub ntawm lub multimeter tau txuas nrog lub emitter e thiab collector c ntawm cov raj sib xyaw. Yog hais tias lub multimeter pointer swings me ntsis tom qab rov qab mus rau infinity, lub capacitance yog ib txwm; Yog hais tias tus pointer tsis txav los yog tsis tuaj yeem rov qab mus rau qhov kawg, ces lub capacitance tau puas lawm. Hauv kev sim ua haujlwm, tshwj xeeb tshaj yog nyob rau hauv kev ntsuas me me capacitance, rov qab hloov qhov ntsuas capacitance tus pin tiv tauj ob lub ntsiab lus, txhawm rau kom pom tseeb pom lub viav vias multimeter.
