Color Meter 181 Bonetti Drive San Luis Obispo, CA 93401 ph: 805-549-0161 fax: 805-549-0163 e-mail:usl@uslinc.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. One Year Limited Warranty USL, Inc. warrants that each product manufactured by it will be free from defects in material and workmanship under normal usage for a period of one (1) year after its purchase new from an authorized dealer.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. Table of Contents Getting Started ......................................................3 How It Works .........................................................5 Measuring Color ....................................................6 Terminology ...........................................................8 Measurements ......................................................9 Making The Measurements ...................................9 Specifications ............
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. PRELIMINARY OPERATING INSTRUCTIONS This color analyzer measures luminance (in ft-Lamberts or candelas per square meter), chromaticity, (CIE 1931 x,y values) and correlated color temperature, cct, in Kelvin. It has an optical viewfinder with a seven degree field of view. Measurements are made within a one degree area that is indicated by a small circle in the center of the field. The measurement results are displayed within a window on your laptop computer.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. Figure 1 Luminance values can be shown in either foot-Lamberts or candelas per square meter. The choice is made by clicking on either button below the luminance value box. A spectral graph of the light seen by the Color Analyzer is shown in figure three. This graphical representation can be displayed by first clicking on the small rainbow icon in the upper left-hand corner of the laptop display and then on the spectral graph option as shown in figure two.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. Figure 3 HOW IT WORKS The Color Analyzer works much like a camera. Light is gathered and integrated during the exposure time. The exposure time is automatically controlled according to the amount of light received. Lower light levels require longer exposures. It is important that the Color Analyzer and the target subject not move during the exposure period. That period can be from one millisecond to several seconds.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. Measuring Color The measurement of length and weight are relatively simple tasks. They are both one dimensional. The measurement of color is much more difficult, as is the description of color. It is multi-dimensional. The apparent or subjective color of an object or surface is also affected by many things. The color or spectral content of the light on the surface strongly affects the apparent color.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. The CIE also established a chromaticity diagram for displaying the region of human color sensitivity (see figure 1). This diagram displays the hue and saturation of colors in terms of the chromaticity coordinates, x (horizontal scale) and y (vertical scale). Lightness is not indicated on this two dimensional chart. The approximate center of the chart, (~x=.31 and y=.360), indicates no color, thus no saturation.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. TERMINOLOGY 1. Luminance Luminance is a term used to describe the amount of light reflected from a surface. An often used synonym is brightness. The unit of luminance is the foot-Lambert in English units, or the candela per square meter in metric units. One foot-Lambert equals 3.462 cd/sq.meter. The PCA color meter measures luminance and displays the results on the laptop display. 2.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. MEASUREMENTS The USL Projection Color Analyzer has been designed to make the measurements required in installation and maintenance of movie theaters. The PCA is a spot meter that measures luminance, chromaticity and correlated color temperature.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. Projection Stray Light The stray light of concern includes all ambient light from sources within the auditorium as well as lens flare from the projection lens. Measurement of the stray light is done by projection a special test film, which has a black spot in the center and measuring the light on the screen within the projected black spot.
PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. PCA Export It is recommended but not required that you stop the scanning before exporting any data.The PCA export function is designed to allow a recording of PCA data displayed into either Microsoft Word or Microsoft Excel compatible documents. At this time, only the MS Word export will contain a specified company logo and the actual spectral readout of the current scanned sample.
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PCA INSTRUCTION MANUAL Ultra Stereo Labs, Inc. 181 Bonetti Drive, San Luis Obispo, CA 93401 ph: 805-549-0161 fax: 805-549-0163 e-mail:usl@uslinc.
