Spectroradiometers

• Introduction
• Features
• Specifications

Features

Product Features

1. Accurate ultra-low luminance measurements as low as 0.0005 cd/m2

By utilizing technology to reduce sensor signal noise, the CS-2000A achieves an additional decimal place of performance compared to previous models. The CS-2000A enables stable measurement in ultra-low luminance regions by providing highly accurate measurements as low as 0.0005cd/m2 at a measurement angle of 1°C. In addition, it maintains less than 5nm half bandwidth* (considered necessary for measuring color) throughout the entire measurement wavelength range, enabling precise color measurements.

* Half bandwidth: An indicator of wavelength resolution.

2. Measurement supporting scotopic vision*1

Standard spectral luminous efficiency* of scotopic vision is included in "Data Management Software CS-S10w Professional" (included as a standard accessory), enabling highly accurate measurements corresponding to scotopic vision.

* Standard spectral luminous efficiency: Relative visual sensitivity*2 determined by the International Commission on Illumination (CIE) and used as a standard

3. High-speed measurement of microscopic areas

The measurement angle switching function of the CS-2000A allows the user to select measurement angles of 0.1°C, 0.2°C, or 1°C according to the application. This enables a standard minimum measuring diameter of Ø0.5mm; furthermore, with the close-up lens (optional accessory), areas as small as Ø0.1mm can be measured. Therefore, the CS-2000A can be used not only for measuring general displays, but also for quick and stable luminosity and chromaticity measurements of ultra-small areas such as on automotive or aircraft instrument panels and for indicators of automotive audio systems.

4. Quality control based on the dominant wavelength

"Data Management Software CS-S10w Professional", included as a standard accessory, enables acceptance judgments* based on the dominant wavelength. The CS-2000A is thus optimal for quality control of LEDs, which are hailed as the next generation in lighting, and various other new lighting devices.

* Acceptance judgment based on dominant wavelength: Judges whether the primary wavelength (dominant wavelength) of the respective color is within the standard range in the chromaticity evaluation of LEDs or other illuminating light sources.

5. Accurate measurement of illuminance

Attaching a diffuser adapter for illuminance measurement (optional accessory) enables the CS-2000A to accurately perform spectroscopic measurements of illuminance and chromaticity of irradiated light.

*1 There are two types of photoreceptor cells that govern human visual perception: Cone cells capable of recognizing colors, and rod cells that recognize brightness only. The darker the environment, the more actively the rod cells function. Scotopic vision refers to the state where only the rod cells are functioning. In this state, the peak of sensitivity shifts from green to blue; as a result, blue color is perceived more brightly. The state where cone cells are mainly functioning due to ample lighting is called photopic vision.*2 Indicates the sensitivity to the brightness of light at a certain wavelength relative to the sensitivity to the brightness of light at the wavelength that human eyes are most sensitive to (555nm for photopic vision and 507nm for scotopic vision), which is set as 1.*3 A polychromator is a structure in which light dispersed into its separate wavelengths by a diffraction grating (operating in the same way as a prism) is converged by a converging lens onto specific positions for each wavelength on an array-type light-receiving element (sensor). This structure enables high-speed measurements because all wavelengths of the light are measured simultaneously by multiple sensors.*4 When measured with a peak luminance of 500 cd/m2 at a measurement angle of 1°C

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