Yokogawa provides simpliciting for measuring in one unit with benefits including:
Adjust and inspect the luminance, contrast, flicker and chromaticity of displays more efficiently
|Displays luminance as a digital value and bar graph in a range of 0.01 to 40,000 cd/m². User-specified MIN, MAX and other criteria can be entered for GO/NO-GO testing.|
|Measures the luminance of the "white" and "black" displays to instantaneously calculate and display the contrast. The calculated contrast is compared with the userset value for GO/NO-GO testing.|
|Displays flicker ratio (ACrms/DC) as digital values (% and dB) and a bar graph. Useful for flicker adjustment.|
|Chromaticity measurement mode
Displays GO or NO-GO for the measured value based on the userspecified reference color and range.
A different color calibration coefficient can be set for up to 10 different display types and 6 reference colors, enabling more precise chromaticity measurements for each color in each display.
White balance measurement mode
(R, G, B) (RGB ratio)
Measures the light's average luminance (DC) and effective flicker value (ACrms) to calculate and display the flicker ratio (ACrms/DC). The flicker of base frequencies between 20 and 90 Hz can be measured by varying the programmable low-pass filter's cutoff frequency.
The flicker correction function enables conversions to flicker ratios (%, dB) defined by JEITA and VESA standards.
|Programmable low-pass filter|
High-Precision Chromaticity Measurement
The characteristics of the color filters in 3298F's photodetector approximate the CIE 1931 color matching functions, and the tester performs optimization calculations to minimize error. Each sensor is calibrated with a combination of a type A standard light source/threewavelength fluorescent lamp and color filters. The optimized coefficient calculated for each light source is used to enable high-precision color measurement.
CIE 1931 Color Matching Function
3298F Chromaticity Measurement (Example)
|Type A standard light source + color filters||Three-wavelength fluorescent lamp + color filters|
White Balance Adjustment
The 3298F displays RGBL levels for differences between Rm, Gm and Bm values (calculated from measured tristimulus values) and Rs, Gs and Bs values (calculated from the target color temperature/luminance) in real time. Displays can be djusted to the target color temperature/luminance by adjusting all their RGBL values to 100%.
|CIE 1931 color matching functions||RGB color system (NTSC)|
|Displaying difference between target color temperature/luminance and measured values||After adjusting RGBL values to 100%|
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