The portable Konica Minolta CL-200A illuminance colorimeter employs a cosine-diffused, tristimulus sensor that is matched to the CIE 1931 colour matching functions. The CL-200A reports illuminance (in lux) as well as CIE tristimulus values (XYZ), CIE chromaticity (xy & u’v’ coordinates) and correlated colour temperature (CCT, in Kelvin). The CL-200A provides a high level of measurement accuracy. The three filtered photodiodes within the sensor head are individually matched to the CIE 1931 colour matching functions, with an f1’ factor of 6% for the illuminance channel. The cosine diffuser ensures that the effective illuminance from off-axis light sources is scaled correctly.
The CL-200A is the colorimeter version of the Konica Minolta T-10A photometer. Pro-Lite maintains a CL-200 (predecessor to the CL-200A) that is available for short term rental.
Konica Minolta CL-200A Overview
The CL-200A is a portable illuminance colorimeter that employs a cosine-diffused, tristimulus sensor that is matched to the CIE 1931 colour matching functions. The CL-200A reports illuminance (in lux) as well as CIE tristimulus values (XYZ), CIE chromaticity (xy & u’v’ coordinates) and correlated colour temperature (CCT, in Kelvin). The CL-200A provides a high level of measurement accuracy. The three filtered photodiodes within the sensor head are individually matched to the CIE 1931 colour matching functions, with an f1’ factor of 6% for the illuminance channel. The cosine diffuser ensures that the effective illuminance from off-axis light sources is scaled correctly.
The CL-200A provides illuminance measurements over 4 decades, from 0.1 to 99,900 lux (colour readings require 5 lux or higher). In nature, illuminance typically ranges from about 0.01 lux on a dark night to about 100,000 lux on a hot summer day. Workplace illumination is normally around 500-1000 lux.
The CL-200A conveniently allows you to separate the sensor head from the main body of the meter. This allows you to hold the sensor towards the light source whilst standing to one side and reading the light level. To use the CL-200A in this way, you will need to order a couple of optional accessories: the T-A20 receptor unit for the main body; and the T-A21 receptor unit for the sensor head with 1m LAN cable.
Basic operation of the CL-200A gives you readings of the illuminance in lux (or you can select foot candles if you prefer), chromaticity as CIE xy or u’v’ coordinates, correlated colour temperature (CCT) in Kelvin and dominant wavelength in nm. The CL-200A also reports the tristimulus values XYZ and colour difference. Advanced operation allows you to hold a reference reading and enter colour correction factors specific to the type of light source under test. Zero adjustment is automatic, while you can either leave the meter to set its own range automatically or choose your preferred range manually. The LCD display features a backlight that turns on automatically under low ambient illumination. The CL-200A operates from AA-size batteries (non-rechargeable) that last for approximately 72 hours of use.
Parameter | CL-200A Specification |
Relative Spectral Response | 3 silicon photodiode sensors spectrally matched to the CIE 1931 2° colour matching functions x(λ), y(λ) & z(λ) |
f1’ Spectral Matching (DIN 5032) | 6%, y(λ) channel |
Measurement Parameters | Illuminance, Ev (lux, footcandles) CIE tristimulus values XYZ CIE chromaticity coordinates (xy & u’v’) Correlated colour temperature (CCT, Kelvin) Dominant wavelength (nm) Colour difference Δ(XYZ), Δ(Ev xy), Δ(Ev u’v’) |
Measuring Range | 0.1 – 99,990 lux >5 lux for chromaticity measurements |
Accuracy | ± 2% illuminance ± 0.002 xy chromaticity (>800 lux, CIE illuminant A) |
Integration Time | 0.5 seconds (continuous readout) |
Interface | USB |
Power | 2 x AA batteries (NOT rechargeable), typical life ~ 72 hours |
Dimensions | 69 x 174 x 35mm |
Weight | 215g (not including batteries) |
The following accessories are either supplied as standard with the CL-200A or are available as optional items for purchase at additional cost:
Qty | CL-200A Standard Accessories |
1 | T-A10 Soft Case |
1 | Cap for Sensor Head |
1 | 2 x AA Batteries Note that the batteries are NOT rechargeable. |
1 | CL-S10w Data Management Software |
1 | T-A15 USB Cable |
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Qty | CL-200A Optional Accessories |
1 | T-A20 Adaptor Unit for Main Body Plugs into the CL-200A meter main body to allow the sensor head to be positioned remotely. |
1 | T-A21 Adaptor Unit for Sensor Head The CL-200 sensor head plugs into the T-A21 adaptor. Connects to T-A20 and the CL-200A main body using a (supplied) 1m LAN cable. |
1 | CL-A11 Hood The CL-A11 hood reduces errors associated with off-axis stray light entering the sensor |
1 | CL-A10 Hard Case |
The CL-200A is capable of performing the following measurements:
Measurement | Units | Application |
Illuminance | lux or footcandles | Illuminance of lamps, LEDs, luminaires, sunlight, vehicle headlamps (etc). |
Luminous Intensity | candelas | The luminous intensity of a lamp may be computed by applying the inverse squared rule to the measured illuminance. Note that the illuminance must be recorded in the photometric far-field. |
CIE Chromaticity | xy & u’v’ | The colour of the illumination from a lamp or other light source. |
Correlated Colour Temperature | Kelvin | The CCT defines the shade of white light from a lamp or other light source. 3000K is described as “warn white” while 5000K is referred to as “cool white”. Light with a CCT of between 2000K and 20000K can be described as white light. |
Dominant Wavelength | nm | The dominant wavelength of a coloured lamp or other light source defines the equivalent monochromatic colour on the spectrum locus of the CIE 1931 colour space that the test source most closely resembles. |
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