Schematic daim duab ntawm tus qauv ntawm ib tug clamp ammeter
Clamp ammeters tau muab faib ua AC clamp ammeters thiab AC thiab DC dual-purpose clamp ammeters raws li cov qauv sib txawv. Yog hais tias lub ntsuas mechanism nyob rau hauv lub clamp ammeter siv ib tug rectifying magnetoelectric ntsuas, nws tsuas yog siv los ntsuas alternating tam sim no. Yog tias siv lub tshuab ntsuas hluav taws xob electromagnetic, nws tuaj yeem siv rau AC thiab DC. Lub clamp ammeter yog qhov tseem ceeb ntawm lub ntsuas hluav taws xob (AC hom) lossis lub ntsuas hluav taws xob (AC-DC ob lub hom phiaj) ntxiv rau lub tshuab hloov tam sim no, thiab nws cov qauv tau qhia hauv daim duab 3-11. Cov tub ntxhais hlau ntawm qhov tam sim no transformer muaj qhov txav tau, uas txuas nrog tus kov. Thaum siv nws, ua ntej nias lub kov kom qhib lub qhov rooj hlau txav tau, muab cov hlau los ntsuas rau hauv lub puab tsaig, thiab tom qab ntawd tso tus kov kom kaw cov tub ntxhais hlau.
Nyob rau lub sijhawm no, cov xaim hla tam sim no sib npaug rau thawj winding ntawm lub transformer, thiab coil qhov txhab ntawm cov tub ntxhais yog sib npaug rau qhov thib ob winding ntawm tam sim no transformer. Lub rectifying los yog electromagnetic ammeter txuas nrog rau ob qhov kawg ntawm qhov thib ob winding. Thaum lub thib ob winding induces tam sim no, qhov taw qhia tam sim no yog induced tam sim no nyob rau hauv lub thib ob winding, thiab nws magnitude yog proportional rau cov ua hauj lwm tam sim no nyob rau hauv lub xeem hlau. Yog li ntev npaum li qhov ntsuas ntsuas tau siv los ua qhov ntsuas ntawm ammeter, thaum lub ntsuas ntsuas ammeter deflects hauv kev faib ua feem, nws tuaj yeem qhia tus nqi ntawm cov ntsuas tam sim no.
