Accuracy is between 10 percent and 15 percent, depending on the part-of-scale. The unit is capable of reading illumination from 10 ft-c to 1,000 ft-c on three scales. Most state sanitary codes base illumination requirements on the footcandle, as do OSHA, NSF, the American Public Health Association, the American National Standards Institute, the Joint Commission on the Accreditation of Health Care Organizations, and the American Correctional Association.įor this reason, the Type 217 Light Meter is ideal for most light measurements. The needle deflection scale reads directly in footcandles (ft-c). The electrical voltage activates a microammeter that causes a deflection of the needle. The light meter is powered by a sensitized selenium cell that converts radiant light energy into electrical voltage no batteries are required. This feature allows for flexibility in reading light intensities in tight and hard-to-reach spaces. A diffusing plate on top of the meter collects light from wide angles so that the cell response will be a function of the cosine of the angle that the incident light makes with the perpendicular. A special filter mounted over the meter cell corrects for color. Since the meter is color- and cosine-corrected, it mimics the color sensitivity of the human eye and can accurately measure light intensity from various directions. A direct reading provides a relatively accurate measurement of illuminance.

The handheld photometer determines the basic efficiency of the visible portion of the electromagnetic spectrum (380 to 760 nanometers) for a specific task. The Type 217 Light meter measures approximately 2x2x3.5 in its case and is ideal for field surveys of illuminance in schools, hospitals, kitchens, warehouses, offices, maintenance shops, and any other place where good illumination is essential. The only significant change over the years has been in outward appearance the color of the case is now battleship gray. Hitler Telugu Full Movie Free Download more. This pocket-sized instrument, manufactured by General Electric, has been around for more than 30 years.

One piece of equipment that we probably all have used at one time or another is the Type 217 Light Meter. Page/Link: Page URL: HTML link: The Free Library.

Ge 214 light meter manual