Pengukur cahaya: Perbedaan antara revisi

 

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Selenium and silicon light meters use sensors that are [[photovoltaic]]. These sensors generate a voltage proportional to light exposure. Selenium sensors generate enough voltage for direct connection to a meter. Silicon sensors need an amplification circuit and require a power source like a [[battery (electricity)|batteries]] to operate. CdS light meters use a sensor based on [[photoresistance]]. These also require a battery to operate. Most modern light meters use silicon or CdS sensors. They indicate the exposure either with a needle [[galvanometer]], or on a [[LCD]] screen.