Taw qhia rau Multimeter Calibration Methods
Lub hauv paus ntsiab lus: Thaum pom muaj peev xwm tsim tau ib lub voj voog kaw nrog lub peev xwm paub txog qhov sib npaug ntawm qhov sib npaug thiab qhov sib txawv, tsis muaj tam sim no ntws hauv Circuit Court vim muaj peev xwm sib npaug. Lub sijhawm no, ntsuas qhov peev xwm tuaj yeem txiav txim siab raws li lub peev xwm paub.
Txoj kev:
1. Los ntawm kev hla tus txheej txheem tam sim no los ntawm lub thawv qhov ntsuas qhov tseeb, koj tuaj yeem tau txais ntau qhov tseeb qhov ntsuas qhov sib npaug.
2. Txuas ib tug precision resistor thiab ib lub potentiometer rau tam sim no kev cai nyob rau hauv series mus rau lub Circuit Court muaj li ntawm ib tug tiv thaiv lub thawv thiab lub hwj chim mov. Lub precision resistor → resistance box → potentiometer → fais fab mov → rov qab mus rau qhov precision resistor, ,
3. Tam sim no ntsuas lub peev xwm ntawm qhov ntsuas qhov ntsuas qhov ntsuas tsis cuam tshuam rau tam sim no. Cov txheej txheem yog los kho cov txheej txheem muaj peev xwm mus rau sab saum toj (koj 200mv), kho cov potentiometer (qhov hluav taws xob poob ntawm qhov ntsuas qhov ntsuas yuav hloov raws li), kom txog rau thaum tsis muaj tam sim no generated nyob rau hauv Circuit Court muaj li ntawm tus qauv roj teeb thiab precision resistor (ntsuas ammeter). Lub sijhawm no, lub peev xwm (voltage poob) ntawm qhov ntsuas qhov ntsuas yog sib npaug rau tus qauv peev xwm, thiab tus qauv tam sim no tau txais. Piv txwv tias koj qhov precision resistor yog 2 ohms, cov zis yog tus qauv tam sim no ntawm 100 milliamps.
Lub sijhawm no, yog tias koj lub thawv ntim khoom yog 1 ohm, qhov hluav taws xob poob ntawm ob qhov kawg ntawm lub thawv tiv thaiv yog 1X100=100 millivolts. Ib yam li ntawd, yog tias lub thawv tsis kam yog 100 ohms, qhov hluav taws xob poob yog 10 volts. Tam sim no koj tuaj yeem txiav txim siab ncaj qha rau qhov poob qis ntawm lub thawv resistor los ntawm nws qhov kev nyeem ntawv.
4. Ib qho kawg ntawm lub multimeter yuav tsum tau calibrated yog txuas nrog rau lub thawv tsis kam thiab potentiometer, thiab lwm qhov kawg yog txuas nrog lub thawv tsis kam txuas nrog cov precision resistor los ntawm tib lub ammeter. Lub multimeter → resistance box → ammeter → rov qab mus rau lub multimeter los tsim lub thib peb circuit.
Ua tib zoo kho lub potentiometer txhua lub sijhawm los ua kom lub ammeter taw tes rau xoom. Nyob rau ntawm lub sijhawm no, tus qauv tam sim no yuav tsis hloov pauv vim tias koj lub multimeter txuas nrog lub ntsuas ntsuas, yog li ntsuas tus nqi yog qhov tseeb. Yog tias lub potentiometer tsis hloov kho, thaum lub multimeter txuas nrog, nws yuav ua rau shunt, thiab tus qauv tam sim no yuav hloov, ua rau qhov ntsuas tsis raug.
