Kev ntsuas tam sim no tsis zoo ib yam li ntsuas lwm qhov ntau nrog DMM. Txoj kev ntsuas tam sim no ncaj qha yog txuas cov digital multimeter ncaj qha mus rau hauv Circuit Court nyob rau hauv kev sim, kom cov tam sim no ntawm Circuit Court nyob rau hauv kev ntsuam xyuas ntws ncaj qha mus rau hauv lub internal Circuit Court ntawm lub multimeter. Txoj kev ntsuas ntsuas tsis ncaj tsis tas yuav qhib lub Circuit Court thiab stringing lub multimeter rau hauv Circuit Court hauv kev sim. Txoj kev indirect siv lub clamp tam sim no.
kev ntsuas ncaj qha
1. Tua lub zog hluav taws xob
2. Disconnect los yog desolder lub Circuit Court nyob rau hauv thiaj li yuav hlua lub 'meter' rau hauv Circuit Court
3. Xaiv qhov sib thooj AC (A~), DC (A--) iav
4. Ntxig cov hlau kuaj dub rau hauv COM lub qhov (socket) thiab cov hlau kuaj liab rau hauv 10A jack (10A) lossis 300mA jack (300mA). Qhov kev xaiv ntawm qhov twg jack yog nyob ntawm qhov ntsuas tau.
5. Txuas qhov kev xeem coj mus rau qhov kev sib txuas ntawm qhov hluav taws xob hauv series.
6. Qhib lub zog hluav taws xob
7. Saib xyuas cov ntawv nyeem thiab sau cov units.
Nco tseg: Thaum ntsuas DC, yog tias qhov ntsuas ntsuas rov qab txuas, "-" yuav tshwm sim.
input tiv thaiv
Ib qho yuam kev feem ntau yog muab cov kev xeem coj mus rau hauv cov jacks tam sim no thaum sim ntsuas qhov voltage. Me me tus nqi resistors hauv DMMs tuaj yeem luv-circuit qhov voltage. Ib tug loj tam sim no ntws los ntawm lub digital multimeter. Yog hais tias lub multimeter tsis muaj kev tiv thaiv txaus, nws yuav tsis tsuas ua rau lub meter thiab Circuit Court puas, tab sis kuj ua mob rau tus neeg teb xov tooj. Nyob rau hauv cov ntaub ntawv ntawm high-voltage circuits (480 volts los yog siab dua), muaj kev txaus ntshai ntau dua.
Therefore, the digital multimeter should have a large enough current input protection fuse. Meters without current input fuses cannot be used in high energy circuits (>240V AC). Siv lub digital multimeter nrog lub fuse, lub fuse yuav tsum muaj lub peev xwm loj txaus.
tus nqi los tshem tawm cov teeb meem siab zog. Qhov ntsuas hluav taws xob ntawm lub fuse yuav tsum siab dua qhov siab tshaj qhov hluav taws xob koj xav tau. Piv txwv li, ib qho ntawm cov multimeters
Lub 20A, 250V fuse tsis tuaj yeem tiv thaiv multimeter thaum ntsuas 480V Circuit Court. A 20A, 600V fuse tuaj yeem ua lub luag haujlwm tiv thaiv thaum lub ntsuas ntsuas ntsuas 480V Circuit Court.
Kev sim tam sim no
Qee zaum, tus nqi tam sim no koj xav ntsuas tshaj qhov ntau ntawm cov digital multimeter lossis cov xwm txheej hauv teb tsis tso cai rau koj qhib lub Circuit Court los ntsuas qhov tam sim no. Tam sim no clamps yog ib qho yooj yim heev thaum kuaj ntawm cov tam sim no siab (feem ntau ntau dua 2A) tsis tas yuav tsum tau muaj siab precision. Lub clamp tam sim no ntsuas qhov tam sim no nyob ib ncig ntawm cov hlau thiab hloov nws mus rau tus nqi uas lub ntsuas hluav taws xob tuaj yeem ua tau.
Muaj ob qhov kev sojntsuam tam sim no: hom transformer tam sim no, uas yog siv rau kev ntsuas AC nkaus xwb. Hall-effect probes rau ntsuas AC lossis DC tam sim no.
Tam sim no converter hom. 1 mA feem ntau yog siv los sawv cev 1 amp. Tus nqi tam sim no ntawm 100 amps dhau los ua 100 mA, uas tuaj yeem ntsuas kev nyab xeeb nrog DMM. Txuas cov xov hlau mus rau "mA" thiab "Com" jacks, thiab tig lub pob qhov rooj rau qhov chaw AC mA.
Hall effect soj ntsuam. Siv 1 millivolt los sawv cev rau AC lossis DC tus nqi ntawm 1 amp. Piv txwv li, 100 amps ntawm AC tam sim no hloov mus rau 100 millivolts ntawm AC voltage. Txuas kev xeem ua rau "V" thiab "Com" jacks. Tig lub pob qhov rooj xaiv rau "V" lossis "mV". Lub sijhawm no, multimeter siv 1 millivolt los sawv cev 1 amp ntawm tam sim no.
Thaum disconnecting los yog desoldering ib tug Circuit Court rau ib tug tam sim no ntsuas, lub hwj chim rau lub Circuit Court yuav tsum tau kuaj yuav tsum tau disconnected. Cov dej me me kuj tuaj yeem ua rau muaj kev phom sij.
Tsis txhob sim ntsuas qhov ntsuas hluav taws xob nrog cov kab ntsuas ntsuas tso rau hauv qhov tam sim no. Nws tuaj yeem ua rau lub moos puas lossis ua rau muaj kev phom sij rau tus kheej.
Inverter-hom tam sim no probes, zoo li Fluke 80i -400. Lub DMM siv 1mA zaub los sawv cev qhov tseeb 1A teeb liab.
Fluke I-1010 Hall-Effect Probe tuaj yeem ntsuas AC lossis DC tam sim no siab heev. Nws converts tam sim no mus rau voltage teeb liab.
Ib qho hluav taws xob tso tawm ntawm 1mV sawv cev rau qhov tam sim no ntawm 1A.
