Cov qauv thiab muaj pes tsawg leeg ntawm multimeter
Lub multimeter muaj peb qhov tseem ceeb: lub taub hau meter, ntsuas Circuit Court, thiab hloov pauv hloov. Lub multimeter yog cov cuab yeej yooj yim tshaj plaws hauv kev ntsuas hluav taws xob thiab tseem yog cov cuab yeej siv dav siv. Multimeters, tseem hu ua multimeter, peb meters (A, V, Ω, tseem hu ua tam sim no, voltage, thiab tsis kam), multiplexers, thiab universal meters, muab faib ua pointer type multimeters thiab digital multimeters. Tseem muaj oscilloscope muaj nuj nqi oscilloscope multimeter, uas yog ib tug multifunctional thiab ntau yam ntsuas ntsuas. Ib qho kev ntsuas dav dav tuaj yeem ntsuas DC tam sim no, DC voltage, AC voltage, tsis kam, suab theem, thiab lwm yam. Qee qhov tseem tuaj yeem ntsuas AC tam sim no, capacitance, inductance, kub, thiab qee qhov tsis sib xws ntawm semiconductors (diodes, transistors). Digital multimeter tau dhau los ua qhov tseem ceeb thiab tau hloov cov cuab yeej analog. Piv nrog rau cov cuab yeej analog, cov cuab yeej digital muaj qhov rhiab heev, raug, pom tseeb, muaj peev xwm tshaj qhov hnyav, thiab nqa tau yooj yim. Lawv kuj yooj yim dua thiab yooj yim rau siv.
Meter header
Lub taub hau ntawm ib tug multimeter yog ib tug rhiab ammeter. Lub dial ntawm lub taub hau yog luam tawm nrog ntau yam cim, nplai cov cim, thiab cov lej muaj nuj nqis. Lub cim A - V - Ω qhia tias qhov ntsuas no yog ib lub ntsuas ntsuas uas tuaj yeem ntsuas qhov tam sim no, qhov hluav taws xob, thiab tsis kam. Muaj ntau qhov ntsuas kab uas luam tawm ntawm lub xov tooj, nrog rau qhov ntsuas ntsuas kab cim nrog "Ω" ntawm sab xis kawg, xoom ntawm txoj cai kawg, thiab ∞ ntawm sab laug kawg. Kev faib tawm ntawm qhov ntsuas qhov ntsuas tsis sib npaug. Lub cim "-" lossis "DC" sawv cev ncaj qha tam sim no, "~" lossis "AC" sawv cev rau qhov hloov pauv tam sim no, thiab "~" sawv cev rau qhov ntsuas kab sib koom los ntawm kev hloov tam sim no thiab ncaj qha tam sim no. Ob peb kab ntawm cov lej hauv qab kab kab yog qhov ntsuas qhov tseem ceeb sib haum rau qhov sib txawv iav txoj haujlwm ntawm tus xaiv hloov.
Kuj tseem muaj lub tshuab xoom hloov kho pob qhov rooj ntawm lub taub hau 'meter' los kho qhov xoom txoj hauj lwm ntawm tus taw tes ntawm sab laug kawg.
Kev xaiv hloov
Kev xaiv hloov ntawm lub multimeter yog ib qho kev hloov pauv nrog ntau lub zog. Siv los xaiv cov khoom ntsuas thiab thaj tsam. Cov khoom ntsuas dav dav ntawm multimeter suav nrog: "mA"; DC tam sim no, "V (-)": DC voltage, "V (~)": AC voltage, "Ω": tsis kam. Txhua yam khoom ntsuas tau muab faib ua ntau yam sib txawv rau kev xaiv.
Cwj mem thiab cwj mem socket
Cov cwj mem muab faib ua xim liab thiab dub. Thaum siv, lub xov tooj liab yuav tsum tau muab tso rau hauv lub qhov (socket) cim nrog "ntxiv", thiab cov kev sojntsuam dub yuav tsum muab tso rau hauv lub qhov (socket) cim nrog "-".
Meter taub hau (digital)
Lub taub hau ntawm lub tshuab hluav taws xob digital feem ntau suav nrog A / D (analog / digital) hloov pauv nti, cov khoom siv sab hauv, thiab LCD zaub. Qhov tseeb ntawm multimeter yog cuam tshuam los ntawm lub taub hau. Vim yog cov lej hloov los ntawm A/D nti, ib lub tshuab multimeter feem ntau hu ua 3 1/2 tus lej digital multimeter, 4 1/2 tus lej digital multimeter, thiab lwm yam. Cov chips feem ntau siv yog ICL7106 (3 thiab ib nrab ntawm ib nrab LCD phau ntawv ntau yam classic nti, nrog rau cov ntawv tom ntej ntawm 7106A, 7106B, 72067240, thiab lwm yam), ICL7129 (4 thiab ib nrab LCD phau ntawv ntau yam classic nti), thiab ICL7107 (3 thiab ib nrab LED phau ntawv ntau yam classic nti).
Kev ntsuas kab
Kev ntsuas hluav taws xob yog ib lub voj voog siv los hloov ntau yam kev ntsuas rau hauv DC tam sim no me me haum rau kev ntsuas ntsuas. Nws yog tsim los ntawm resistors, semiconductor Cheebtsam, thiab roj teeb
Nws tuaj yeem hloov pauv ntau yam kev ntsuas (xws li tam sim no, voltage, tsis kam, thiab lwm yam), ntau yam sib txawv, thiab los ntawm cov txheej txheem ntau yam (xws li rectification, shunting, voltage sib koom, thiab lwm yam) rau hauv ib qho nyiaj ntawm DC tam sim no thiab xa nws mus rau lub taub hau meter rau kev ntsuas.
Hloov pauv
Nws txoj haujlwm yog xaiv ntau yam kev ntsuas ntsuas kom tau raws li qhov yuav tsum tau ntsuas ntawm ntau hom thiab ntau yam. Hloov pauv hloov feem ntau yog lub voj voj voog nrog cov haujlwm thiab cov cim cim nyob ib puag ncig nws.
