Yuav ua li cas xam qhov tseeb ntawm multimeter? - Nws yog qhov yooj yim!
Lub precision specification yog qhia raws li nram no:
feem pua ntawm kev nyeem ntawv ntxiv rau feem pua ntawm qhov ntau
Hauv cov qauv no, "feem pua ntawm kev nyeem ntawv" yog proportional rau kev nyeem ntawv, thiab "feem pua ntawm ntau" yog tus nqi offset. Cov kev qhia tshwj xeeb no yog tsim rau txhua qhov kev ntsuas.
Yog tias qhov tseeb tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev ntsuas ntsuas, ces qhov kev daws teeb meem tsis cuam tshuam rau qhov raug. Txawm li cas los xij, koj tseem tuaj yeem siv multimeter los saib xyuas cov kev hloov pauv me me thaum ntsuas.
Piv txwv li:
Piv txwv tias koj xav ntsuas 10 Vdc teeb liab siv 34401A multimeter nrog 1 xyoo raug thiab 10V ntau yam, qhov tseeb yog: 0.0035 + 0.
yog li ntawd:
Ntsuas tus nqi: 10.00000
Qhov tseeb yog: * ntxiv /-0.00040
Kev daws teeb meem: 0.00001
Qhov kev nyeem ntawv tiag tiag yog nyob nruab nrab ntawm 9.9996 thiab 10.0004
Ob tug lej kawg ntawm kev ntsuas suav nrog qhov yuam kev.
* Qee cov qauv ntawm multimeters siv "ppm" tsis yog "feem pua ntawm kev nyeem ntawv" thiab "feem pua ntawm ntau".
Tus nqi ntawm ppm tuaj yeem muab tau los ntawm kev sib npaug ntawm 1/1, 000, 000 (= 10-6).
piv txwv 1:
Yog tias qhov yuam kev ntawm 1 (V) yog 10ppm,
Ces tus nqi yuam kev yog 1 x 10 x (1/1,000,{5}})=0.00001 (V).
Piv txwv 2:
Yog tias qhov yuam kev ntawm 1 0 (V) yog 5ppm,
Ces tus nqi yuam kev yog 10 x 5 x 10-6=50 u(V).
