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DK-Technologies PM 5639/00
CRT Color Analyzer,
Discontinued

• Independent of phosphor type
• Unique graphic CIE chromaticity display
• Numerical read-out of xy or u'v', luminance Y and correlated color temperature
• User-friendly RGB bar graph display
• Hand-held, 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

Ensuring a high standard of picture quality has become even more important with increasing interchange of program material from different sources such as TV studios and production houses. The PTV CRT Color Analyzer PM 5639/00 assists in this process by meeting the demand for easy control and adjustment of the white reference on any monitor.

The PM 5639/00 consists of a color sensor which is put onto the CRT, and a display unit which can be operated by one hand, leaving the other hand free to adjust the monitor. A rechargeable battery pack is built-in, enabling you to operate the instrument anywhere. The Display Unit has a 64 by 128 dot matrix LCD display with back-lighting in order to make measurements even in dim light possible. Two different graphical display modes have been incorporated.

The PM 5639 is universal and operates with all TV-systems, including HDTV.

Test Signals

The PM 5639/82 Color Alignment Generator Component and the PM 5639/83 Color Alignment Generator Composite are designed to operate automatically together with the Display Unit of the PM 5639/00. The generators may be connected to the display unit which thus operates as a remote control unit. The required test signals for the different calibrations of the monitor can then be recalled automatically. This is especially time saving when performing the low level and high level white balance adjustments.

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 PM 5639. 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 new 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 between the two systems.

The two displays show the color coordinates in either an xy or an u'v' diagram, and at the same time the numerical chromaticity values together with the luminance value (Y) and the correlated color temperature. A color difference mode can be selected. In this mode 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 CIELUV is very close to the smallest color difference which the human eye can distinguish.

The display, either on the Display Unit or on the PC, will show the measurement graphically in a coordinate system, where the pre-programd 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. An indication of the resolution is always given below the graph where a ruler corresponding to a 0.05 in the two directions (xy or u'v') is shown. The luminance Y is shown in the unit selected by the user i.e. candela/m², NIT or foot Lambert.

These displays are completely new and have been found to be very useful when an adjustment to a selected color "white" reference (e.g. D6500 or 3200 K) is needed. These absolute measurements are made possible by using a new concept which relies on optical interference (dichroic) filters.

The concept makes it possible to make filters which fully equal the color response of the standard Observer as defined by CIE. This together with a traceable calibration assure a correct white reference on any monitor independent of the actual phosphor.

RGB Measuring Mode

In the RGB measuring mode the red, green and blue values are shown as three analog bars. These bars are displayed relative to the white reference. There are four possibilities.

• Two of the primary colors are related to the third

• All three primary colors are related to a pre-programd white reference

• All three primary colors are related to one of the measurements stored in the memory of the color analyzer

• All three primary colors are related to an absolute reference level selected by the user

In all cases the absolute luminance value will be displayed in either Candela/m², NIT or foot-Lambert as selected by the user.

In RGB display mode, the adjustment is carried out by bringing the amplitude of the tree bars into the center of the display. It is also here possible to use a zoom function to increase the resolution and make a more accurate adjustment possible.

For the RGB mode to work correctly, the instrument has to known the actual phosphor. This is accomplished in a couple of minutes by use of the monitor controls and the Color Analyzer "learn" mode. The "learn" mode procedure removes the interaction (cross-talk) between phosphors when viewed by the trirecepdtors, and makes the instrument measure correct on the actual phosphor. The phosphor can be stored and named in the color analyzer for later use.

Operation

The instrument is extremely simple to operate. To change between the two active measuring modes xy or u'v and RGB press either the CIE or the RGB button. The rest of the operations are performed by simple menu control. The Function key offers the possibility of selecting between a variety of different measuring facilities.

The following parameters have been factory programd, but the user can program more himself:

• Two different standard phosphors have been preprogramd: EBU and SMPTE"C"

• A maximum of 28 different phosphors can be stored with the "learn" facility

• The three most used references: D6500, 3200, K and 9300 K are preset from the factory. Seven different white references can be programd into the PM 5639/00 either as a measurement of the CRT, or the reference can be entered directly as x and y values

• Three different measuring units. The user can select between Candela/m², NIT or foot-Lambert

The Status display will show the parameters of the active set-up. The Reset button will quickly take the Color Analyzer into a measuring mode that has been programd by the user as the most frequently used. It is also possible for several different users to store and name their own preferred measuring set-ups. The Store button can also be used for storing a measurement which can then be recalled later or used as a reference for relative RGB measurements.

A toggle function for fast switching between two measuring set-ups is included. This is very useful for switching between high and low level settings using the fixed level RGB display.

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