Konica Minolta CS-3000 Luminance Spectroradiometer

Konica Minolta CS-3000 Overview

The Konica Minolta CS-3000 is a state-of-the art, laboratory-grade spectroradiometer designed for testing the spot luminance, contrast, white point and chromaticity of displays. Being a spectroradiometer rather than a more traditional tristimulus colorimeter helps to ensure that the CS-2000 Plus gives more accurate readings with any type of display technology, including LCD, LED and OLED. Luminance levels as low as 0.0001 cd/m² can be measured with the CS-3000, compared with 0.003 cd/m², for the alternative CS-2000 Plus model.

The CS-3000 is designed with single lens reflex (SLR) viewing optics that allows the operator to conveniently view the display or light source through the eyepiece and then focus on the target object for measurement. The CS3000 features three, selectable, internal apertures that provide a measurement field-of-view of 1.0, 0.2 and 0.1°. These correspond to minimum measurement spot sizes of 5.0, 1.0 and 0.5mm at a working distance of 350mm. An accessory close-up lens is available which further reduces the minimum measurement spot size down to 0.1mm diameter.

With the CS-3000, you can measure the visible light spectrum (380-780nm), the luminance (cd/m²), the CIE XYZ tristimulus values, the display white point (CCT in Kelvin), the CIE chromaticity (xy or u’v’), and the dominant wavelength and spectral purity.

Dynamic Range & Accuracy

The CS-3000 is suitable for measuring the performance of any of today’s display devices. Depending upon the internal aperture selected, luminance measurements can be made from 0.0005 up to 500,000 cd/m². If that is not enough, the CS-3000 HDR model extends the dynamic range from 0.0001 cd/m² right up to 10,000,000 cd/m². This allows the CS-3000 or CS-3000 HDR  to faithfully report luminance from the black-state of an OLED panel, right up to the bare LED backlight of an LCD display. Being a spectroradiometer, the CS-3000 provides both luminance and colour values with low uncertainties, with a luminance accuracy of ±2% (CIE reference illuminant A, 1° aperture, ≥ 0.0004 cd/m²).

CS-3000 & CS-3000 HDR Versus CS-2000 Plus

Over and above the CS-2000 Plus model, the CS-3000 and CDS-3000 HDR feature the following enhancements:

• Widest dynamic range for luminance measurements (0.0001 cd/m² to 10,000,000 cd/m²  for the HDR model).
• Intelligent dark current correction (also standard on CS-2000 Plus). The intelligent dark function uses correction information from a sensor unit to correct for any variation in dark current, enabling faster measurement and preserving high accuracy without the need for dark value measurement. 
• Reduced measurement times at low luminance levels. The high speed modes of the CS-3000 significantly reduce measurement times at low luminance levels; for example, gamma measurements can be performed in a quarter of the time taken by conventional instruments.
• Emission frequency detection function. This function detects a display’s emission frequency and sets the measurement integration time to an integral multiple of the detected value. Synchronisation shifts (mismatches between measurement integration time and emission frequency, in effect stroboscopic interference) can lower repeatability. This function prevents these shifts with no increase in measurement time.
• Motorised internal apertures. The motorised internal apertures of the CS-3000 allow for selection of the measurement field-of-view remotely – with the CS-2000 Plus you need to select the aperture manually.

Measurement Spot Size

Luminance meters are often referred to as “spot photometers” due to the fact that the measurement of luminance is made from a defined spot or area on a light source or display. When making luminance measurements it is vital that the measurement spot (as denoted by the central black spot viewed through the eyepiece) is located well within the target area on the object. If the measurement spot only just fits within the lit area, or overlaps any of the surrounding unlit area, the resultant luminance measurement will be erroneous, possibly to a significant degree.

The CS-3000’s selectable field-of-view (1.0, 0.2 and 0.1°) correspond to minimum measurement spot sizes of 5.0, 1.0 and 0.5mm at a working distance of 350mm. An accessory close-up lens is available which reduce the minimum measurement spot size down to 0.1mm diameter.

Other Important Information

The CS-3000 is intended for laboratory use and is powered from an AC mains power supply. It can measure luminance from areas as small as 0.1mm diameter. We recommend that you purchase a sturdy tripod with a 3-axis adjustable tripod head – both of which are available from Pro-Lite. Attaching the optional cosine diffuser adapter to the input of the CS-3000 provides for illuminance measurements (units of lux). The CS-3000 is fitted with USB 2.0 and RS-232 interfaces and PC data management software CS-S30 is included as standard. This allows for remote control of the CS-3000, and for logging of the measurement data and further analysis in Excel.