IHARA AccuDot Dot Measurement Instrument
| Brand | Ihara Electronic |
|---|---|
| Origin | Japan |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Imported |
| Model | AccuDot |
| Pricing | Upon Request |
Overview
The IHARA AccuDot Dot Measurement Instrument is a portable, self-contained optical metrology device engineered for precise, on-site evaluation of halftone dot structures in printed materials and prepress workflows. Operating on the principle of high-resolution digital image capture combined with real-time spatial frequency analysis, the AccuDot performs non-contact measurement of critical halftone parameters—including dot size (as percentage area coverage), dot geometry, line screen frequency (lpi or lpcm), screen angle (in degrees), and tone value (dot gain) according to ISO 12647-2 and ISO 13660 standards. Designed for field use in printing plants, quality control labs, and packaging inspection environments, the instrument eliminates dependency on external computing hardware: all image acquisition, processing, and reporting occur internally via its embedded ARM-based processor and calibrated CMOS imaging module.
Key Features
- Standalone handheld operation—no PC connection required for basic measurements or data review
- Color graphical LCD display (320 × 240 pixels) with intuitive icon-driven interface optimized for glove-compatible operation in production settings
- Integrated precision optical path featuring fixed-focus lens system with 50× magnification and LED illumination uniformity ≥98% across field of view
- Real-time dot analysis engine supporting both AM (amplitude-modulated) and FM (frequency-modulated) screening patterns
- On-device storage for up to 500 measurement records with timestamp, operator ID, and configurable project tagging
- Ruggedized ABS+PC housing rated IP54 for dust and splash resistance; operating temperature range: 10–35 °C
Sample Compatibility & Compliance
The AccuDot accommodates standard print substrates including coated/uncoated paper, cardboard, flexible films (PET, BOPP), and metallic foils. Its measurement algorithm is validated for dot sizes ranging from 5% to 95% area coverage at screen rulings from 40 to 300 lpi (1.6 to 12 lpcm). All calibration procedures follow traceable NIST-traceable reference targets supplied with each unit. The instrument complies with ISO/IEC 17025 requirements for measurement uncertainty estimation and supports audit-ready reporting aligned with ISO 9001:2015 and ISO/IEC 17025:2017 documentation frameworks. Optional firmware updates maintain conformance with evolving ISO 12647 series revisions and GRACoL/FOGRA characterization data sets.
Software & Data Management
While fully functional offline, the AccuDot interfaces seamlessly with IHARA’s optional AccuView PC software (Windows 10/11, 64-bit) via USB 2.0 for advanced statistical process control (SPC), comparative trend analysis, and PDF report generation. Data export formats include CSV (for Excel integration), XML (for MES/ERP ingestion), and proprietary .ADT files containing raw image metadata, FFT spectral profiles, and measurement confidence indicators. Software features include multi-instrument fleet management, user role-based access control (admin/operator/viewer), and full 21 CFR Part 11 compliance with electronic signature support, audit trail logging, and data integrity validation.
Applications
- Prepress verification of plate output and digital proofing accuracy
- In-line QC during offset, flexographic, and gravure press runs
- Post-print evaluation of dot gain, trapping, and moiré formation
- Supplier qualification testing for contract packaging and label manufacturers
- Technical training and process troubleshooting in graphic arts education programs
- Supporting ISO 12647-2 conformance audits for commercial print certification (e.g., G7, SWOP, Fogra PSO)
FAQ
Does the AccuDot require periodic recalibration?
Yes—annual recalibration against certified halftone reference standards is recommended. IHARA-certified service centers provide NIST-traceable recalibration with full certificate of conformity.
Can it measure stochastic (FM) screens?
Yes—the AccuDot’s adaptive spatial filtering algorithm distinguishes FM dot clusters from AM grids and reports effective dot frequency, cluster density, and local tone deviation.
Is battery life sufficient for a full shift?
With alkaline AA batteries, continuous operation exceeds 8 hours; rechargeable NiMH packs extend runtime to 12+ hours. Power-saving mode activates after 90 seconds of inactivity.
What file formats can be exported from the device memory?
Direct USB export supports CSV (measurement summary), JPEG (annotated preview image), and .ADT (full dataset with FFT spectrum and metadata).
Does it support multiple languages?
The UI supports English, Japanese, German, French, and Spanish—language selection is configurable via Settings > System > Language.
