Txoj cai thiab tus qauv ntawm multimeter on-off iav
Yuav luag tag nrho cov multimeters muaj ib qho kev ntsuas kev ntsuas uas siv los txiav txim siab seb kab yog nyob rau lossis tawm (luv luv luv). Lub buzzer thiab LED teeb yog feem ntau ua haujlwm. Thaum lub voj voog txuas nrog, lub buzzer lossis LED teeb yuav qhib. Lub multimeter's on / off gear yog qhia los ntawm kos npe rau hauv lub thawv liab hauv daim duab.
Lub hauv paus ntsiab lus ntawm on-off iav
Lub tshuab hluav taws xob sab hauv tau qhib thaum lub multimeter tau teeb tsa rau ntawm qhov chaw qhib. Cov hlau lead kuaj dub txuas nrog lub roj teeb sab hauv lub cev tsis zoo, cov ncej zoo txuas nrog lub resistor nrog qhov tsis muaj zog, thiab lwm qhov kawg ntawm cov resistor txuas nrog cov hlau kuaj liab. Lub resistor muab lub cim teeb liab rau hauv chirping circuit.Qhov voltage ntawm lub trigger resistor nyob rau hauv lub 'meter' yog siab yog hais tias ob lub xeem leads shorted ua ke los yog lawv kuj yog tsawg, uas ua rau lub beep yuav tsum tau qhib. Lub beep tsis tuaj yeem qhib tau yog tias qhov ib nrab ntawm qhov hluav taws xob thoob plaws hauv qhov kev sib txuas ntawm cov hluav taws xob txuas nrog hauv cov koob yog tsawg dhau vim muaj qhov ua haujlwm siab ntawm ob qhov kev xeem ua.
On-off iav standard
Raws li cov ntsiab lus dav dav, conductivity txhais tau tias yog 80 ohms lossis tsawg dua; txwv tsis pub, nws yog non-conductivity. Hauv lwm lo lus, koom nrog multimeter qhov kev xeem liab thiab dub ua rau kab ob kawg. Lub multimeter yuav ua suab nrov thiab ntseeg tias txoj kab ua haujlwm yog tias qhov kev tiv thaiv tsawg dua 80 ohms.
