Multimeter hluav taws xob thaiv ntau yam thiab ntsuas qhov yuam kev
Multimeters muaj ntau yam siv. Lawv tuaj yeem siv los ntsuas qhov kev tiv thaiv, qhov hluav taws xob, thiab lwm yam. Thaum siv cov hluav taws xob tsis kam ntawm lub tshuab hluav taws xob los ntsuas qhov tsis kam, cia peb saib yuav ua li cas xaiv cov hluav taws xob tsis zoo ntawm multimeter thiab yuav ua li cas txo qhov kev ntsuas qhov yuam kev.
Noj ib qho MF{{0}}} multimeter ua piv txwv, qhov chaw nruab nrab ntawm Rxl0 thaiv yog 250Ω, qhov nruab nrab tsis kam ntawm R × l00 thaiv yog 2.5kΩ, thiab qib raug yog 2.5.
Siv R × l 0 iav thiab R × 100 iav los ntsuas 500Ω tus qauv tsis kam. Lub iav twg muaj qhov kev ntsuas loj dua?
1. R × l 0 thaiv: Qhov siab tshaj plaws qhov yuam kev △R (10)=chaw tiv thaiv × R%=250Ω × (± 2.5)%=± 6.25 Ω.
Thaum ntsuas 500Ω tus qauv tsis kam, qhov taw qhia tus nqi ntawm 500Ω tus qauv tsis kam yog nyob nruab nrab ntawm 493.75Ω thiab 506.25Ω. Qhov siab tshaj qhov txheeb ze yuam kev yog: ± 6.25÷500Ω × 100% =± 1.25%.
2. R × l00 thaiv: Qhov siab tshaj plaws tso cai yuam kev △R (100)=chaw tiv thaiv × R% 2.5kΩ × (± 2.5)%=± 62.5Ω.
Thaum ntsuas 500Ω tus qauv tsis kam, qhov taw qhia tus nqi ntawm 500Ω tus qauv tsis kam yog nyob nruab nrab ntawm 437.5Ω thiab 562.5Ω. Qhov siab tshaj qhov txheeb ze yuam kev yog: ± 62.5÷500Ω × 100% =± 10.5%.
Kev txheeb xyuas qhov tshwm sim:
Xaiv qhov sib txawv kuj yuav ua rau muaj qhov sib txawv loj hauv kev ntsuas qhov yuam kev. Yog li cas peb tuaj yeem txo qhov ntsuas qhov yuam kev?
Thaum xaiv cov iav ntau yam, sim ua kom ntsuas qhov ntsuas qhov ntsuas ntawm qhov nruab nrab ntawm qhov ntev ntawm qhov ntsuas qhov ntsuas kom ntsuas qhov tseeb thiab txo qhov ntsuas qhov yuam kev.
Multimeter hluav taws xob thaiv
Qhov hluav taws xob tiv thaiv ntau yam ntawm multimeter yog dav heev, thiab txhua qhov ntau tuaj yeem siv los ntsuas qhov ntsuas qhov ntsuas ntawm 0 mus rau ∞.
Cov qauv qhia txog qhov tseeb ntawm kev thaiv hluav taws xob ntawm lub tshuab hluav taws xob yog: R%=(△R/center resistance) × 100%.
Qhov ntsuas ntawm ohmmeter yog ib qho tsis-linear thiab tsis sib npaug inverse scale, qhia raws li feem pua ntawm qhov ntev ntawm qhov ntsuas. Qhov kev tiv thaiv sab hauv ntawm txhua qhov sib npaug yog sib npaug ntawm qhov nruab nrab qhov sib npaug los ntawm qhov ntev ntawm qhov ntsuas, uas yog hu ua "central resistance".
Thaum qhov kev tiv thaiv raug ntsuas yog sib npaug rau qhov chaw tiv thaiv ntawm qhov kev xaiv, qhov tam sim no ntws hauv Circuit Court yog ib nrab ntawm qhov ntsuas tam sim no, thiab tus taw tes qhia qhov nruab nrab ntawm qhov ntsuas.
