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DK-Technologies PM 5639-CRT
CRT Color Analyzer Kit

• Independent of phosphor type.
• Unique graphic CIE chromaticity display.
• User-friendly RGB bar graph display.
• Hand-held and battery operated.
• Reproducible and accurate alignment of any monitor.
• Traceable to international color standards.
• Calibration to any white reference.
• CIE 1931 standard observer response.
• Automatic adaptation to any field rate - also HDTV.
• Uses high stability dichroic filters.
• Wheeled flight case for easy transportation

DK-Technologies PM5639KIT Shown

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Test signals
When the sensor is used together with the handheld display unit, full benefits of the PM5639/82 and PM5639/83 Color Alignment Generators can be achieved. The display unit works in this set-up as a control unit for the generator. The required test signals can then be recalled automatically.

The Absolute Measuring Modes: xyY and u'v'Y
Two absolute measuring modes both defined by CIE, the International Commission on Illumination, are realized in the PM5639. The xy system is the original CIE 1931 color measuring system. The u'v' CIE 1976 is later made as a change to the original xy system. The latter system is more color uniform than the original, meaning that the system is a better description of the human color perception, related to the perception of color differences. It is possible by numeric calculation to convert from one system to the other.

The color coordinates are shown in either an xy or an u'v' diagram, and at the same time the numerical chromaticity values are shown together with the luminance value (Y) and the correlated color temperature. In the RGB bargraph display the difference between the reference values and the measured values are displayed. In all modes the color error dE CIELUV is calculated as the difference between the reference and the actual color according to the CIE 1976 L*u*v* (CIELUV) color space definition. 1 CIE-LUV is very close to the smallest color difference, detectable by the human eye.

The display on the Display Unit, will show the measurement graphically in a coordinate system, where the pre-programmed color reference is shown as a small box and the measured color as a dot. The monitor is adjusted correctly when the dot falls within the box. Using the zoom function, this adjustment can be done very accurately. The luminance Y is shown in the units selected by the user i.e. candela/m2, NIT or foot-Lambert.

These absolute measurements are made possible by using the concept, which relies on optical interference (dichroic) filters. With interference filters it is possible to match closely the color response of the Standard Observer as defined by CIE. This together with a traceable calibration assures a close alignment of the white reference on any monitor independent of the monitor brand.