De Facto Industry Standard for Measuring Color Temperature
Compact and Easy to Carry
The CL-200A's compact body fits in your palm. It is battery-powered, allowing it to be taken along and used anywhere.
[Diagram Description: Image shows a hand holding the CL-200A meter.]
Detachable Receptor Head
The receptor head can be detached and connected to the main body using a standard LAN cable, facilitating easy installation of the sensor in an inspection system. (Note: Optional Adapter Units are required for the receptor head and main body).
[Diagram Description: Diagram illustrates the receptor head detached from the main body and connected via a LAN cable, demonstrating its integration into an inspection system.]
Data Transfer via Main Body Buttons
When using the CL-200A with the included Data Management Software CL-S10w, measurements can be taken and data transferred to Excel® using the device's main body buttons or computer keys.
Excel® Add-in Software Included
This easy and convenient Excel® add-in allows measurement data from the CL-200A to be transferred directly into Excel®. The transferred data can then be managed freely within Excel®.
Includes LED Ranking Function
Color variations, a significant factor in the LED industry, can be quantified, and a ranking function is provided.
JIS Correlated Color Temperature
Correlated color temperature is determined using equations defined by JIS (Japanese Industrial Standards).
Multi-Point Measurement and User Calibration
Multi-point measurement management is supported for up to 30 receptor heads. The user calibration function allows compensation of measurement values to match a desired standard. Calibration can be performed using either single-point calibration or RGB calibration methods.
[Diagram Description: Image shows the CL-200A device with its software interface displaying measurement data, including Ev, T, and Δuv values.]
Applications
For Lighting Production and Adjustment
When working with various light sources in a room or open space, checking the color of the lighting is often necessary. The CL-200A enables adjustment of lighting color to achieve desired effects, such as enhancing the appearance of food in a restaurant.
[Diagram Description: Image depicts a cityscape with illuminated buildings and traffic lights, suggesting diverse lighting environments.]
For Evaluating Light Source Characteristics
The distribution of light from LED illumination modules or lighting fixtures can be evaluated for illuminance.
[Diagram Description: A graph shows illuminance (Ix) plotted against height (m) and horizontal distance (m), illustrating light distribution patterns.]
For Color-Viewing Cabinet Maintenance
Color-viewing cabinets, used in industries like printing for visual evaluation under controlled conditions, require precise illuminance and color temperature. The CL-200A assists in the daily maintenance and control of lamps within these cabinets, signaling when lamp replacement is needed.
For Projector Light-Source Research and Color Inspection
The CL-200A can measure the white balance and uniformity of microprojectors, particularly those with internal LED light sources. By connecting multiple receptors via LAN cables, measurements can be taken at up to 30 points across the projected area, not just at the center.
For LED Billboard Development and Maintenance
The CL-200A facilitates quality control for LED modules used in digital signage. It helps ensure billboard uniformity by measuring the chromaticity and color temperature of modules, allowing for selection that prevents a mottled appearance.
[Diagram Description: A schematic illustrates the process of creating white light from blue LED and phosphor, including a spectral emission graph and an image of an LED array.]
Technical Details and Accuracy
Accurate Measurements of Color Temperature
Accurate illumination color temperature measurement is particularly important for light sources with non-continuous spectrums, such as LEDs. The CL-200A is capable of measuring color temperature accurately.
The CL-200A features sensors that closely match the CIE color-matching functions, enabling precise color measurement. Measurement results can be displayed in various color notations, such as "Correlated color temperature and \u0394uv," depending on the application.
Photographic color meters, used to select appropriate filters for compensating light color, may yield significant errors when measuring light sources with non-continuous spectrums. This is because they rely primarily on the blue/red balance of illumination and their sensor sensitivity is adjusted to match film or digital camera sensors.
| Measurement | Measured Color Temperature | Color-temperature difference from standard-instrument measured value |
|---|---|---|
| Our company's standard instrument | 5045 K | 0 |
| CL-200A | 5011 K | -34 |
| Photographic color meter | 5600 K | 555 |
Color Temperature and Correlated Color Temperature Explained
Color Temperature: When an ideal blackbody is heated, it emits light that changes color from red to yellow to white as its temperature increases. This color is expressed as the absolute temperature of the blackbody in Kelvin (K). For example, a 7000K color corresponds to the light emitted by a blackbody heated to 7000K. The curve representing these colors on an xy chromaticity diagram is called the "blackbody locus." Color temperature expresses a color on this locus.
Correlated Color Temperature: The color of white light emitted by illumination equipment and displays is often close to the blackbody locus. While normally expressed using "color temperature," these light sources may not fall directly on the blackbody locus. Correlated color temperature provides a method for similar color expression for colors within a region close to the blackbody locus. To accurately express this, the correlated color temperature and the difference from the blackbody locus (\u0394uv) are stated.
[Diagram Description: Figure 1 shows the blackbody locus on an xy chromaticity diagram. Figure 2 is a close-up of the blackbody locus, illustrating the correlated color temperature region.]
*Blackbody: An ideal radiator that completely absorbs all incident electromagnetic radiation. Although a perfect blackbody does not exist, coal serves as a familiar example of a similar object.
LED Manufacturing Process and Systems
Measurements in the LED Manufacturing Process
White Light from Blue LED and Phosphor: White light is produced by mixing blue light from an LED with yellow light from a phosphor.
Problem: Variations in the spectral emission distribution of individual LEDs can lead to inconsistencies in the resulting white light. Controlling color mixing is essential, especially when multiple LEDs are used.
General Solution:
- Measure the spectral emission characteristics of each LED element and rank them accordingly.
- Measure the emission characteristics of the phosphor and rank them accordingly.
- Combine the ranked LED elements and phosphor materials to achieve the desired white light.
- Inspect the output light quality of the final assembled white LED lamp.
How the CL-200A Can Help: The CL-200A can measure the chromaticity from the phosphor and inspect the output light quality of the final assembled white LED lamp.
[Diagram Description: A schematic illustrates the process of creating white light from blue LED and phosphor, including a spectral emission graph and an image of an LED array.]
LED Total Flux Measurement System
This system integrates the Spectroradiometer CS-2000 (modified for illuminance measurement) with an LED total flux measurement adapter. It utilizes a spectral measuring instrument conforming to CIE 122-1996 as the receptor. The total flux emitted in all directions by the LED is diffused by an integrating sphere and then received for measurement by the spectroradiometer.
The system conforms to CIE 127:2007.
The receptor's spectral response closely matches the CIE spectral luminous efficiency function V(λ), eliminating the need for complex color correction.
To ensure accurate measurements, a self-absorption compensation function is included to correct for the reduction in integrating sphere output caused by self-absorption of the light source when it is lit inside the sphere.
[Diagram Description: A system diagram shows a constant-current power supply, LED holder, integrating sphere unit, baffle, Spectroradiometer CS-2000 (modified for luminance measurement), and a PC running LED measurement software.]
System Diagram, Specifications, and Safety
System Diagram
[Diagram Description: A comprehensive diagram illustrates the setup for the Chroma Meter CL-200A. It shows the main unit, optional receptor heads, adapter units for connecting the head to the main body or for CRT measurement, and accessories like hoods and cases. It also depicts the connection to a PC via USB cable for data management software (CL-S10w) and to a printer via a printer cable. The diagram outlines configurations for single-point measurement (head and body connected via cable) and multi-point measurement (using optional AC adapter and multiple receptor heads connected via LAN cables).]
Main Specifications of Chroma Meter CL-200A
| Specification | Details |
|---|---|
| Model | Chroma Meter CL-200A |
| Luminance meter class | Conforms to requirements for Class AA of JIS C 1609-1:2006 "Illuminance meters Part 1: General measuring instruments" |
| Relative spectral response | Closely matches CIE Standard Observer curves x(λ), y(λ), and z(λ); Within 6% (f1') of the CIE spectral luminous efficiency V(λ) |
| Cosine response (f2) | Ev: Within 3% |
| Receptor | Silicon photocell |
| Measuring function | Tristimulus values: XYZ; Chromaticity: Evxy; Evu'v'; Ev, Dominant wavelength, Excitation purity; Correlated color temperature: EvTcp uv; Tcp(JIS method; available only with CL-S10w); Color difference: (XYZ), (Evxy), (Evu'v'), Ev u'v'(Target: 1) |
| Other function | User calibration function, Data hold function, Multi-point measurement (2 to 30 points) |
| Measuring range | 0.1 to 99,990 lx, 0.01 to 9,999 fcd (Chromaticity : 5 lx, 0.5 fcd or above) in four automatically selected ranges (lx or fcd is switchable) |
| Accuracy | Ev (Linearity): ±2%±1 digit of displayed value; xy: ±0.002 (at 800 lx, Standard Illuminant A measured) |
| Repeatability | Ev: 0.5%+1 digit (2σ); xy: ±0.0005 (at 800 lx, Standard Illuminant A measured) |
| Temperature drift | Ev: ±3% ±1 digit of displayed value; xy: ±0.003 (Based on Konica Minolta's standard measurement conditions) |
| Humidity drift | Ev: ±3% ±1 digit of displayed value; xy: ±0.003 (Based on Konica Minolta's standard measurement conditions) |
| Response time | 0.5 sec. (continuous measurement) |
| Digital output | USB |
| Display | 4-significant-digit LCD with back-light illumination |
| Operating temperature/humidity range | -10 to 40°C, relative humidity 85% or less (at 35°C) with no condensation |
| Storage temperature/humidity range | -20 to 55°C, relative humidity 85% or less (at 35°C) with no condensation |
| Power source | 2 AA-size batteries / AC adapter (optional) |
| Battery life | 72 hours or longer (When alkaline batteries are used) in continuous measurement |
| Dimensions | 69×174×35mm (2-6/16×6-14/16×1-7/13in.) |
| Weight | 215g (7.6 oz.) not including batteries |
| Standard accessories | Case T-A10, Cap T-A13, Strap, AA Batteries (2)*, Data Management Software CL-S10w, USB cable T-A15 (*Not included as standard accessory in some areas) |
| Optional accessories | Receptor Head, Adapter Unit for Main Body T-A20, Adapter Unit for Receptor Head T-A21, AC Adapter AC-A308 (For 1 to 10 receptor heads), AC Adapter AC-A311 (For 1 to 30 receptor heads), Printer Cable T-A12, Hood CL-A11, Hard Case CL-A10 |
Main Specifications of Data Management Software CL-S10w
Type: Add-in for Excel® (* Excel® is required to use this add-in).
Operating environment: One of the following environments with Excel® installed: Windows® XP + Excel® 2003 (English, Japanese, or Simplified Chinese) or Windows® 7 + Excel® 2007 (English, Japanese, or Simplified Chinese). (Note: Refer to respective specifications for details on system requirements. Languages in parentheses are the OS language.)
Compatible instruments: CL-200A, CL-200 (* Some functions not usable with CL-200).
Safety Precautions
For correct use and your safety, be sure to read the instruction manual before using the instrument.
Always connect the instrument to the specified power supply voltage. Improper connection may cause a fire or electric shock.
Be sure to use the specified batteries. Using improper batteries may cause a fire or electric shock.
Contact Information
Konica Minolta Sensing, Inc. Osaka, Japan
Konica Minolta Sensing Americas, Inc. New Jersey, U.S.A. Phone: 888-473-2656 (in USA), 201-236-4300 (outside USA) Fax: 201-785-2482
Konica Minolta Sensing Europe B.V. European Headquarter / BENELUX Nieuwegein, Netherlands Phone: +31(0)30 248-1193 Fax: +31(0)30 248-1280
[List of other Konica Minolta Sensing offices in Germany, France, UK, Italy, Switzerland, Sweden, Poland, China, and Singapore with their contact details.]
For the latest contact information, please refer to the KONICA MINOLTA SENSING Worldwide Offices web page: http://konicaminolta.com/instruments/about/network
Trademarks: KONICA MINOLTA and the Konica Minolta logo are registered trademarks or trademarks of KONICA MINOLTA HOLDINGS, INC. Windows® and Excel® are trademarks of Microsoft Corporation.
©2010 KONICA MINOLTA SENSING, INC.
