Konica Minolta CA-2500 Two-Dimensional Color Analyzer
| Brand | Konica Minolta |
|---|---|
| Origin | Japan |
| Model | CA-2500 |
| Minimum Measurable Luminance | 0.05 cd/m² |
| Luminance Range | 0.05–5,000,000 cd/m² (with lens-dependent dynamic range extension) |
| Sensor Type | XYZ-filtered CCD with CIE 1931 spectral responsivity match |
| Lens Options | Standard, Wide-angle, Telephoto (with macro coupling ring) |
| Synchronization Frequency Range | 4–2,000 Hz |
| Factory Calibration | Per-lens, per-focus-position optical calibration |
| Included Software | CA-S25w (with autofocus assistance, auto-alignment guidance, and automatic ROI detection) |
| SDK Included | Yes, for custom application integration |
| Compliance | Designed for ISO/CIE-compliant photometric and colorimetric evaluation in R&D and production QA environments |
Overview
The Konica Minolta CA-2500 Two-Dimensional Color Analyzer is an engineered solution for high-fidelity spatial photometric and colorimetric characterization of emissive displays and light sources. Based on the fundamental principles of CIE 1931 colorimetry, the instrument employs a precision-calibrated XYZ-filtered CCD sensor—whose spectral responsivity closely replicates the human eye’s photopic luminous efficiency function (V(λ)) and tristimulus sensitivity curves (x̄(λ), ȳ(λ), z̄(λ)). Unlike RGB-based imaging systems optimized for reproduction rather than metrology, the CA-2500 delivers traceable, spectrally accurate luminance (Y) and chromaticity (x, y or u′, v′) data across the full measurement field. Its two-dimensional acquisition capability enables pixel-level mapping of luminance uniformity, chromaticity shift, white point distribution, and correlated color temperature (CCT) gradients—critical parameters in display development, panel qualification, and lighting system validation.
Key Features
- Extended low-luminance sensitivity: Measures down to 0.05 cd/m²—twice the lower limit of its predecessor (CA-2000)—enabling reliable assessment of OLED black levels, dimmed automotive instrumentation, and standby-mode indicators.
- Enhanced mechanical and optical durability: Rated for up to five times more operational cycles than the CA-2000, supporting sustained use in high-throughput lab and production-line environments.
- Modular lens system: Includes three interchangeable lenses—Standard (50 mm equivalent), Wide-angle (24 mm equivalent), and Telephoto (100 mm + macro coupling ring)—each pre-calibrated at multiple focus distances to maintain measurement integrity across object sizes from small smartphone panels to large-format signage.
- Time-synchronized pulsed-source measurement: Supports precise capture of flickering or PWM-driven emitters (e.g., PDPs, microLEDs, automotive LED clusters) via user-defined trigger frequencies from 4 Hz to 2,000 Hz, ensuring phase-aligned integration and eliminating temporal aliasing artifacts.
- Factory-applied optical calibration: Each lens/sensor combination undergoes individual radiometric and colorimetric calibration at the factory, covering vignetting correction, lens transmission profiles, and XYZ filter spectral deviation compensation—eliminating the need for user recalibration prior to first use.
Sample Compatibility & Compliance
The CA-2500 is validated for quantitative evaluation of flat-panel displays (LCD, OLED, QD-LCD, MicroLED), automotive HMI surfaces (digital dashboards, HUDs), architectural and task lighting fixtures, and general-purpose luminaires. It conforms to the geometric and spectral requirements of CIE Publication No. 127 (2007) for LED intensity measurement, ISO 9241-307 (Ergonomics of human-system interaction – Methods for evaluating electronic visual displays), and supports traceability to NIST-traceable standards through Konica Minolta’s certified calibration services. While not a regulatory device per se, its measurement methodology aligns with the photometric foundations referenced in IEC 62341-6-3 (OLED display testing), JEITA ED-2531A (LCD evaluation), and SAE J171 (automotive lighting photometry).
Software & Data Management
The bundled CA-S25w software provides a streamlined workflow from setup to reporting. Its real-time assistive functions—including focus confirmation overlays, crosshair-guided alignment aids, and automatic region-of-interest (ROI) detection—reduce operator dependency and minimize setup variability. Measurement data are stored in vendor-neutral formats (CSV, TIFF, XML) containing full metadata: exposure time, lens ID, calibration timestamp, XYZ channel values, and derived metrics (Δu′v′, CCT, luminance uniformity ratio). The included Software Development Kit (SDK) exposes a COM-based API for integration into automated test benches, MES systems, or proprietary analytics platforms—supporting scripting in Python, C#, VB.NET, and LabVIEW. Audit trails, user access control, and report templates comply with GLP-aligned documentation practices; optional 21 CFR Part 11 compliance packages are available upon request.
Applications
- Display R&D: Quantifying Mura defects, viewing-angle-dependent chromaticity shifts, and gamma non-uniformity across active matrix panels.
- Production QA: Pass/fail verification of luminance and chromaticity specifications per zone (e.g., ISO 13406-2 class definitions) for consumer electronics OEMs.
- Automotive lighting: Mapping brightness gradients and CCT consistency across instrument cluster backlights and ambient lighting zones under varying thermal conditions.
- Lighting design validation: Assessing spatial CCT homogeneity in tunable-white luminaires and identifying hotspots in COB-based fixtures.
- Standards compliance testing: Generating input data for reports required by ENERGY STAR, DLC, or IES LM-79–derived spatial analysis protocols.
FAQ
Does the CA-2500 require periodic user recalibration?
No. Each unit ships with lens-specific factory calibration files embedded in firmware. Recalibration is only recommended after physical impact, extended exposure to extreme temperatures (>50°C), or if used outside specified humidity ranges (20–80% RH, non-condensing).
Can the CA-2500 measure non-planar or curved displays?
Yes—provided the surface remains within the depth-of-field of the selected lens and maintains consistent distance across the ROI. For highly curved surfaces (e.g., wraparound automotive displays), telecentric lens adapters may be required for angular response correction.
Is raw sensor data accessible via the SDK?
Yes. The SDK provides access to unprocessed XYZ-channel digital counts, exposure metadata, and dark-frame references—enabling custom spectral reconstruction or algorithmic enhancement beyond default CA-S25w processing pipelines.
What is the maximum measurable display size with the standard lens?
At a working distance of 500 mm, the standard lens covers approximately 320 × 240 mm. Field coverage scales inversely with distance; full-size 65-inch TV panels can be measured at ~2.5 m using the same lens, though resolution per mm decreases accordingly.
How does the CA-2500 handle ambient light interference during measurement?
The instrument uses synchronized shutter control and dark-reference subtraction. For critical applications, Konica Minolta recommends performing measurements in controlled ambient conditions (<1 lux illuminance) or using optional light-shielding enclosures to ensure signal-to-noise ratios remain above 10⁴:1 at minimum luminance settings.
