Yuav ua li cas xam qhov tseeb ntawm multimeter?
Accuracy depends on the error value included in the measurement. The accuracy specification is expressed as follows: " percent of reading plus percent of span". In this formula, " percent of reading" is proportional to reading, and " percent of range" is the offset value. These specifications are developed for each measurement range.
Yog tias qhov tseeb tsis ua raws li qhov yuav tsum tau ua ntawm kev ntsuas kev daws teeb meem, 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 nrog 34401A multimeter nrog 1 xyoo raug thiab 10V ntau yam, ces qhov tseeb yog: 0 .0035 + 0.
yog li ntawd:
Ntsuas tus nqi: 10.00000
Qhov tseeb yog: ntxiv /-0.00040
Kev daws teeb meem yog: 0.00001
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.
Some models of multimeters use "ppm" instead of " percent of reading" and " percent of range". The value of ppm can be obtained by multiplying by 1/1,000,000 (= 10-6).
Piv txwv 1: Yog tias qhov yuam kev ntawm 1 (V) yog 10ppm, qhov tseeb qhov yuam kev yog 1 x 10 x (1/1,000,000) = 0.00001 (V)
Piv txwv 2: Yog tias qhov yuam kev ntawm 1 0 (V) yog 5ppm, qhov tseeb qhov yuam kev yog 10 x 5 x 10-6=50 u (V)
Cov lus qhia tseeb raug txhais raws li qhov xwm txheej tshwj xeeb, xws li kev hloov pauv kub thiab ntsuas ntsuas (xws li AUTO ZERO ON / OFF).
