Njira Zoyezera Pogwiritsa Ntchito Multimeter
Multimeter ndi chida choyezera chogwiritsidwa ntchito m'njira zosiyanasiyana chomwe chili chofunikira kwambiri pamagetsi ndi zamagetsi. Ndi chipangizo chimodzi, titha kuyeza magetsi, mphamvu yamagetsi, kukana, ndi zina zambiri monga kupitirira, ma diode, capacitance, ma frequency, komanso kutentha (kutengera mtundu wa multimeter). Chifukwa cha ntchito zake zosiyanasiyana, kuthekera kogwiritsa ntchito multimeter ndi njira yoyenera ndi luso loyambira kwa ophunzira, akatswiri, ndi anthu omwe amakonda kugwiritsa ntchito zamagetsi. Nkhaniyi ikufotokoza njira zoyezera pogwiritsa ntchito multimeter, kuyambira kukonzekera ndi kusankha njira mpaka malangizo achitetezo ndi zolakwika zomwe anthu ambiri ayenera kupewa.
1. Kumvetsetsa Mitundu ya Multimeter: Analog ndi Digital
Kawirikawiri, ma multimeter amagawidwa m'mitundu iwiri: ma analog multimeter ndi ma digital multimeter (DMMs). Ma analog multimeter amagwiritsa ntchito pointer ndi sikelo, pomwe ma digital multimeter amawonetsa mtengo wake pa sikirini. Pakadali pano, ma digital multimeter amagwiritsidwa ntchito kwambiri chifukwa cha kuwerenga kwawo kosavuta, kulondola kwambiri, komanso mawonekedwe ake omveka bwino. Komabe, ma analog multimeter akadali othandiza powona kusintha kwachangu kwa mtengo (monga kusinthasintha kwa chizindikiro), chifukwa singano imayenda mosalekeza.
2. Mbali Zofunika za Multimeter
Musanayese miyeso, choyamba mvetsetsani magawo a multimeter:
– Chophimba (chowonetsera): chikuwonetsa zotsatira za muyeso (pa multimeter ya digito).
– Chosankha (chosinthira chozungulira): kusankha mtundu wa muyeso (V, A, Ω, kupitiriza, diode, ndi zina zotero) ndi mulingo woyezera.
– Cholumikizira/cholumikizira cha probe: komwe chingwe cha probe chimalumikizidwa. Nthawi zambiri chimakhala ndi:
– COM (yofala/yoipa): ya chipangizo chakuda chofufuzira.
– VΩmA: poyezera mphamvu yamagetsi, kukana, ma diode, kupitirira, ndi mafunde ang'onoang'ono (mA).
– 10A kapena 20A: makamaka pa mafunde akuluakulu (kutengera mtundu wa multimeter).
– Chingwe choyezera/choyezera: nthawi zambiri chimakhala chofiira (chabwino) ndi chakuda (chabwino). Njira yogwirira ndi kukhudza choyezera imakhudza kwambiri chitetezo ndi kulondola.
3. Mfundo Zoyambira za Muyeso: Mndandanda ndi Kufanana
Chimodzi mwa makiyi ogwiritsira ntchito multimeter ndikumvetsetsa momwe mungalumikizire chida choyezera:
- Kuyeza mphamvu yamagetsi (V) kumachitika limodzi ndi gwero la mphamvu yamagetsi kapena katundu.
- Kuyeza mphamvu yamagetsi (A) kumachitika motsatizana ndi dera (multimeter imakhala gawo la njira yamagetsi).
- Kuyesa kukana (Ω) kumachitika pa zigawo zomwe sizili ndi mphamvu (dera liyenera kuzimitsidwa ndipo gawolo liyenera kuchotsedwa muderali kuti njira zofananira zisakhudze zotsatira).
Cholakwika chofala kwambiri ndi kuyeza mphamvu yamagetsi koma multimeter imalumikizidwa motsatizana, chifukwa ingayambitse kuti fuse ya multimeter iphulike kapena kuwononga chidacho.
4. Njira Yoyezera Mphamvu ya DC (V⎓)
Mphamvu yamagetsi ya DC (direct current) imapezeka m'mabatire, ma adapter a DC, mabanki amagetsi, ndi ma circuits amagetsi. Masitepe ake ndi awa:
1. Lumikizani ma probe: wakuda ku COM, wofiira ku doko la VΩ.
2. Sankhani DCV mode (V yokhala ndi mzere wowongoka/wodulidwa).
3. Ngati multimeter siigwira ntchito yokha, sankhani malo okwera kuposa magetsi oyembekezeredwa (monga 20V pa batire ya 9V kapena 12V).
4. Lumikizani ma probe motsatizana: wofiira ku mfundo yabwino, wakuda ku mfundo yoipa/yotsika.
5. Werengani zotsatira zake. Ngati chizindikiro cha minus (-) chikuwonekera, zikutanthauza kuti polarity yabwerera m'mbuyo (chofufuzira chofiira chili pamalo olakwika).
Langizo: onetsetsani kuti nsonga za probe sizikukhudzana mukamayesa pamalo opapatiza chifukwa izi zingayambitse short circuit.
5. Njira Zoyezera Voltage ya AC (V~)
Mphamvu yamagetsi ya AC (alternating current) nthawi zambiri imapezeka mumagetsi apakhomo (PLN), ma transformer, ndi zina zotulutsa ma adapter. Masitepe ake ndi awa:
1. Chofufuzira chakuda kupita ku COM, chofiira kupita ku VΩ.
2. Sankhani mawonekedwe a ACV (V~).
3. Sankhani malo oyenera, mwachitsanzo 600V kapena 750V yamagetsi apakhomo kutengera muyezo wa multimeter.
4. Lumikizani choyezera chofanana ndi gwero kapena malo oyezera.
5. Werengani mtengo wa magetsi.
Chitetezo: poyesa mphamvu yamagetsi ya AC yokwera, gwiritsani ntchito dzanja limodzi nthawi iliyonse yomwe zingatheke, pewani kukhudza zigawo zachitsulo za probe, ndipo onetsetsani kuti chotetezera chingwe sichinawonongeke.
6. Njira Yoyezera Kukana (Ω)
Kuyeza kukana n'kothandiza poyang'ana kuchuluka kwa resistor, zingwe zosweka, kapena momwe zinthu zina zilili.
1. Zimitsani gwero lamagetsi la dera ndikuwonetsetsa kuti capacitor yayikulu yatulutsidwa.
2. Chofufuzira chakuda kupita ku COM, chofiira kupita ku VΩ.
3. Tembenuzani chosankhacho kukhala Ω.
4. Gwirani ma probe onse awiri ku miyendo ya chinthu/choletsa.
5. Werengani zotsatira. Ngati multimeter ikuwonetsa "OL" kapena "1" (kutengera chitsanzo), kukana kumakhala kwakukulu kwambiri kapena dera latsekedwa.
Kuti mupeze zotsatira zolondola, yesani resistor mwendo wake umodzi utachotsedwa mu dera kuti usakhudzidwe ndi njira zina.
7. Mayeso Opitilira
Njira yopitilira imagwiritsidwa ntchito poyang'ana ngati mfundo ziwiri zalumikizidwa (monga zingwe, ma track a PCB, ma switch). Nthawi zambiri imalembedwa ndi sipika kapena chizindikiro cha mafunde a mawu. Njira:
1. Sankhani njira yopitirizira.
2. Gwirani chofufuziracho ku mfundo ziwiri zomwe mukufuna kuyesa.
3. Ngati mumva phokoso la "beep", zikutanthauza kuti kukana kwake ndi kochepa kwambiri ndipo mzerewo walumikizidwa.
Kupitirizabe kumathandiza kwambiri pofufuza mawaya osweka, ma PCB track osweka, kapena kuyang'ana ma fuse.
8. Mayeso a Diode
Diode mode imagwiritsidwa ntchito poyang'ana ma diode, ma LED, ndi ma semiconductor junctions monga ma transistors (pazifukwa zina). Masitepe ambiri:
1. Sankhani mawonekedwe a diode.
2. Chofufuzira chofiira nthawi zambiri chimapita ku anode, chakuda chimapita ku cathode (kutengera multimeter, koma pa DMM nthawi zambiri izi zimachitika).
3. Multimeter imawonetsa mphamvu yamagetsi kutsogolo, mwachitsanzo 0,5–0,7V ya ma diode a silicon, kapena 1,8–3,3V ya ma LED (mitundu ina).
4. Ngati yasinthidwa ndipo ikuwerengedwa kuti “OL,” diode mwina ndi yachibadwa. Ngati yatsika mbali zonse ziwiri, diode ikhoza kufupikitsidwa; ngati yatsika mbali zonse ziwiri, ikhoza kusweka.
9. Njira Zoyezera Mphamvu ya DC/AC (A)
Kuyeza kwamakono ndiye gawo loopsa kwambiri chifukwa multimeter iyenera kulumikizidwa motsatizana. Masitepe:
1. Dziwani mphamvu yamagetsi yomwe ikuyerekezeredwa. Yambani pa doko la 10A ngati mukukayikira.
2. Sungani chofufutira chofiira kupita ku doko la A/10A, chofufutira chakuda chikadali pa COM.
3. Sinthani chosankha kukhala A DC kapena A AC ngati pakufunika.
4. Dulani dera pamalo enaake, kenako lumikizani multimeter motsatizana: mphamvu yamagetsi iyenera "kudutsa" multimeter.
5. Werengani zotsatira zake. Ngati ndi zazing'ono kwambiri, sinthani ku doko la mA (ngati lili lotetezeka) kuti mupeze mawonekedwe abwino.
Chofunika kudziwa: musayese mphamvu yamagetsi ndi probe yomwe ili mu doko lamagetsi kenako muyilumikize molunjika ndi gwero la magetsi, chifukwa izi zimapangitsa kuti pakhale njira yocheperako.
10. Zolakwa Zofala ndi Malangizo Oteteza
Zolakwika zina zofala:
– Ndayiwala kusuntha choyezera chofiira kuchokera ku doko A kupita ku doko VΩ nditamaliza kuyeza mphamvu yamagetsi.
- Kusankha njira yolakwika (monga kuyeza voltage koma chosankha pa Ω).
- Yesani kukana mu dera lomwe likugwiritsabe ntchito magetsi.
- Kusankha mtundu wotsika kwambiri kumabweretsa "kuchuluka kwa zinthu".
Malangizo achitetezo:
- Gwiritsani ntchito multimeter yokhala ndi gulu loyenera la chitetezo (CAT II/CAT III/CAT IV) mukamagwiritsa ntchito magetsi.
- Yang'anani momwe chipangizo choyezera kutentha chilili komanso momwe zinthu zilili musanagwiritse ntchito.
- Gwirani chofufuzira pafupi ndi chotenthetsera, osati chitsulo.
- Gwiritsani ntchito mlingo wapamwamba kwambiri poyamba ngati simukudziwa.
- Pewani kugwira ntchito m'malo onyowa ndipo gwiritsani ntchito mphasa yotetezera kutentha ngati pakufunika kutero.
Kutseka
Njira zoyezera ma multimeter sizimangotanthauza kungotembenuza chosankha ndi kuwerenga manambala. Zimaphatikizaponso kumvetsetsa ma circuit, kusankha njira yoyenera, ndikugwiritsa ntchito bwino mfundo yofanana ndi mndandanda. Mukadziwa bwino miyeso ya DC/AC, kukana, kupitirira, diode, ndi current, mutha kuzindikira mavuto osiyanasiyana amagetsi ndi zamagetsi mwachangu komanso mosamala. Yesetsani kugwiritsa ntchito multimeter pama circuit osavuta poyamba, kenako pitani ku miyeso yovuta kwambiri mukapeza chidziwitso. Mwanjira imeneyi, multimeter simangokhala chida choyezera komanso "diso" lalikulu lomvetsetsa machitidwe a circuit.
