Luxmeter Illuminance Calibration
Calibration txoj cai:
Cia peb xav tias Ls illuminates lub photocell vertically thiab E=I/r2; peb mam li hloov r kom tau tus nqi photocurrent ntawm ntau yam illuminations; thiab peb txhais cov nplai tam sim no rau hauv lub teeb pom kev zoo raws li kev sib raug zoo ntawm E thiab i.
Txoj kev Calibration:
Hloov qhov kev ncua deb l ntawm lub photocell thiab tus qauv teeb thaum tswj kev ua hauj lwm nyob deb ntawm lub approximate point teeb qhov chaw. Sau cov ammeter nyeem ntawm txhua qhov deb. Xam cov illumination E siv txoj cai inverse square ntawm kev ncua deb E=I/r2, thiab ces xam lub illumination E los ntawm Qhov no yuav ua tau ib tug series ntawm photocurrent qhov tseem ceeb kuv nrog txawv illumination, thiab tsim lub calibration nkhaus rau lub illuminance meter los ntawm plotting kev sib raug zoo ntawm photocurrent I thiab illumination. Siv cov ntaub ntawv no, lub ntsuas hluav taws xob lub ntsuas hluav taws xob tuaj yeem muab faib los ntsuas lub cuab yeej.
Cov yam ntxwv cuam tshuam rau calibration nkhaus:
Recalibration yog yuav tsum tau thaum lub photocell thiab ammeter hloov; tom qab lub illuminance meter tau siv rau ib lub sij hawm, lub illuminance meter yuav tsum recalibrated (feem ntau 1-2 zaug nyob rau hauv ib xyoos); high-precision illuminance meters yuav calibrated nrog lub teeb siv tus qauv teeb; nthuav Cov calibration ntau yam ntawm lub illuminance meter yuav hloov qhov kev ncua deb r, los yog xaiv txawv qauv teeb, thiab xaiv ib tug me me galvanometer.
