Maintenance method of WEST0NMASTERll exposure meter in America

Maintenance methods of selenium exposure instrument can be roughly divided into two types:

One is to replace a selenium photovoltaic cell directly and adjust it: find a selenium photovoltaic cell with small attenuation, cut it into appropriate size and replace the old one. This method is easy to understand, and it is reasonable to replace the damaged parts with new parts of the same model. The problem is that selenium photovoltaic cells have been discontinued for many years, and it is getting harder and harder to get them now.

The other is to replace selenium photovoltaic cells with other types of photovoltaic cells. After all, selenium photovoltaic cells are not the only component of light power generation. At present, the most commonly used silicon photovoltaic cells (that is, the most common solar cells) have the advantages of long life, no fear of aging, and no need to store them in the dark.

An exposure meter is an instrument used to measure the intensity of light. In photography, the exposure meter is used to determine the appropriate exposure time. When the film sensitivity and shutter speed are known, the exposure meter gives the aperture value to obtain the best exposure. Exposure meter is also used to control the brightness of lighting, or as a handheld instrument to ensure that the light intensity meets the requirements of shooting.