Yuav ua li cas ntsuas inductance nrog multimeter
Kev txheeb xyuas ntawm Xim Code Inductors
Muab lub multimeter nyob rau hauv R × Thaum xub thawj iav, txuas cov cwj mem liab thiab dub mus rau qhov kawg ntawm cov xim code inductor, thiab tus pointer yuav tsum viav vias mus rau sab xis. Raws li kev ntsuas tus nqi tiv thaiv, muaj peb qhov xwm txheej tshwj xeeb rau kev txheeb xyuas:
Tus nqi tsis kam ntawm qhov ntsuas xim code inductor A yog xoom, thiab muaj qhov cuam tshuam nrog luv luv. Tus nqi DC tsis kam ntawm qhov kuaj xim code inductor yog ncaj qha ntsig txog txoj kab uas hla ntawm enameled hlau siv rau winding lub inductor kauj thiab tus naj npawb ntawm windings. Tsuav tus nqi kuj tuaj yeem ntsuas tau, kuaj xim xim inductor tuaj yeem suav tias yog qhov qub.
Kev txheeb xyuas ntawm nruab nrab lub voj voog transformers
A Teem lub multimeter rau R × Thawj iav, xyuas qhov kev tshwm sim ntawm txhua qhov cua ntawm ib qho los ntawm ib qho raws li txoj cai tus pin ntawm txhua qhov winding ntawm nruab nrab lub voj voog transformer, thiab tom qab ntawd txiav txim seb nws puas zoo li qub.
B Test rwb thaiv tsev kev ua tau zoo
Muab lub multimeter rau hauv R × 10k iav, ua raws li cov xwm txheej hauv qab no:
(1) Tus nqi tiv thaiv ntawm thawj winding thiab theem nrab winding;
(2) Tus nqi tsis kam ntawm thawj winding thiab lub casing;
(3) Tus nqi tsis kam ntawm qhov nruab nrab winding thiab lub casing.
Cov txiaj ntsig kev xeem saum toj no tuaj yeem muab faib ua peb qhov xwm txheej:
(1) Tus nqi kuj yog infinite: ib txwm;
(2) Zero tsis kam: muaj qhov cuam tshuam luv luv;
(3) Kev tiv thaiv tus nqi tsawg dua infinity tab sis ntau dua xoom: muaj qhov ua txhaum cai.
3. Kev kuaj xyuas lub zog transformer
Tshawb xyuas seb puas muaj qhov txawv txav los ntawm kev soj ntsuam cov tsos ntawm lub transformer. Piv txwv li, seb cov coil leads puas tawg, desoldered, seb puas muaj cov cim hlawv ntawm cov khoom siv rwb thaiv tsev, seb lub fastening screws ntawm cov tub ntxhais hlau yog xoob, seb cov ntawv silicon steel puas yog xeb, thiab seb lub winding coil puas raug.
B rwb thaiv tsev kuaj. Siv lub multimeter R × Ntsuas qhov ntsuas qhov tseem ceeb ntawm cov tub ntxhais thiab thawj, thawj thiab theem nrab, cov tub ntxhais thiab theem nrab, electrostatic shielding txheej thiab theem nrab, thiab theem nrab windings ntawm 10k iav. Lub multimeter pointer yuav tsum tau kho nyob rau hauv infinity. Txwv tsis pub, nws qhia tias tsis zoo rwb thaiv tsev kev ua tau zoo ntawm lub transformer.
C coil on/off detection. Muab lub multimeter nyob rau hauv R × Hauv iav 1, thaum lub sij hawm xeem, yog hais tias tus nqi kuj ntawm ib tug tej yam winding yog infinite, nws qhia tau hais tias muaj ib tug qhib Circuit Court txhaum nyob rau hauv lub winding.
Paub qhov txawv ntawm thawj thiab theem nrab coils. Thawj thiab thib ob pins ntawm lub hwj chim transformer feem ntau yog coj tawm ntawm ob sab, thiab cov thawj winding feem ntau cim nrog lo lus 220V, thaum lub thib ob winding yog cim nrog tus nqi voltage, xws li 15V, 24V, 35V, thiab lwm yam. Tom qab ntawd txheeb xyuas raws li cov cim no.
E. Kev kuaj xyuas tsis muaj kev thauj khoom tam sim no. (a) Kev ntsuas ncaj qha. Qhib tag nrho cov windings thib ob, tso lub multimeter nyob rau hauv AC tam sim no ntau yam (500mA) thiab txuas mus rau thawj winding nyob rau hauv series. Thaum lub plug ntawm thawj winding yog muab tso rau hauv ib tug 220V AC mains mov, lub multimeter qhia qhov tsis muaj-load tam sim no tus nqi. Tus nqi no yuav tsum tsis txhob ntau tshaj 10 feem pua mus rau 20 feem pua ntawm cov transformer tag nrho cov load tam sim no. Feem ntau, qhov tsis muaj kev thauj khoom tam sim no ntawm lub zog hloov hluav taws xob rau cov khoom siv hluav taws xob yuav tsum nyob ib puag ncig 100mA. Yog tias nws dhau ntau dhau, nws qhia tau hais tias lub transformer muaj qhov ua txhaum luv luv. (b) Indirect ntsuas txoj kev. Txuas lub 10 Ω / 5W resistor nyob rau hauv cov thawj winding ntawm lub transformer, thiab tag nrho cov thib ob windings tseem unloaded. Teem lub multimeter rau AC voltage. Tom qab fais fab tuag, siv ob qhov kev sojntsuam los ntsuas qhov voltage poob U ntawm ob qhov kawg ntawm qhov tsis kam R, thiab tom qab ntawd siv Ohms
