YANRUN HMM-240S Portable Video-Measurement Metallurgical Microscope

Overview

The YANRUN HMM-240S Portable Video-Measurement Metallurgical Microscope is an upright, compact optical instrument engineered for on-site and laboratory-based microstructural evaluation of metallic, ceramic, and composite specimens. Designed around conventional finite-conjugate optical architecture with a standardized 160 mm mechanical tube length, the system employs transmitted and reflected illumination pathways optimized for brightfield, darkfield, and oblique illumination modes—essential for revealing grain boundaries, phase distributions, inclusion morphology, and surface defects in polished or etched metallographic samples. Unlike fully digital inverted systems, the HMM-240S retains direct optical viewing capability while integrating real-time video capture via its built-in 5.6-inch high-resolution LCD display—eliminating dependency on external monitors or PCs during field inspections, quality audits, or educational demonstrations. Its portability, robust mechanical construction, and DC-powered LED illumination make it suitable for use in production floors, foundries, failure analysis labs, and technical training environments where stable AC infrastructure may be limited.

Key Features

• Upright optical configuration with ergonomic viewing angle and fixed-stage design, supporting standard 25 × 75 mm or 30 × 75 mm metallographic slides.
• Integrated 5.6-inch TFT-LCD display with native resolution sufficient for real-time focus verification, basic measurement annotation, and image freeze-capture—no external computing hardware required.
• Coaxial coarse and fine focusing mechanism offering 25 mm vertical travel range and sub-micron repeatability, calibrated for consistent depth-of-field control across magnification settings.
• Adjustable-intensity cold-white LED illumination (DC 4.2 V) providing uniform Köhler-compatible illumination without thermal drift or bulb replacement cycles—critical for long-duration observation sessions.
• Modular objective turret accommodating one fixed objective (2×, 5×, 10×, or 40×), each corrected for flatness and chromatic aberration per ISO 10934-1 standards for metallurgical imaging.
• Standard 10× wide-field eyepiece (18 mm field number) enabling simultaneous optical viewing and video output—facilitating operator verification and peer review during inspection workflows.

Sample Compatibility & Compliance

The HMM-240S supports standard metallographic specimen preparation protocols compliant with ASTM E3, ISO 643, and GB/T 13298. It accommodates specimens up to 30 mm in height and 75 mm in width, compatible with common mounting resins (epoxy, phenolic, acrylic) and conductive coatings (carbon, gold sputtering). The optical path is optimized for both reflective (incident) illumination of opaque metals and transmitted illumination of thin-sectioned alloys or intermetallics when used with optional condenser upgrades. While not certified to ISO/IEC 17025 for accredited testing, the microscope’s mechanical stability, illumination consistency, and repeatable focusing meet GLP-aligned operational requirements for internal QA/QC documentation and root-cause analysis reporting.

Software & Data Management

The HMM-240S operates as a standalone imaging platform with embedded firmware supporting image capture (JPEG), frame freezing, contrast/brightness adjustment, and basic on-screen measurement tools (distance, diameter, angle) calibrated against user-defined scale bars. No proprietary PC software is bundled; however, optional USB-output digital eyepieces (sold separately) enable integration with third-party image analysis packages compliant with FDA 21 CFR Part 11—such as Olympus cellSens, Olympus Stream, or open-source Fiji/ImageJ—when deployed in regulated environments requiring audit trails and electronic signatures.

Applications

• On-line metallurgical assessment in heat treatment facilities and casting plants.
• Failure analysis of fractured components in aerospace, automotive, and power generation sectors.
• Educational instruction in materials science laboratories for microstructure identification and quantitative metallography fundamentals.
• Supplier qualification audits requiring rapid verification of grain size (ASTM E112), inclusion rating (ASTM E45), or decarburization depth (ASTM E1077).
• Field-based coating thickness estimation and porosity evaluation in thermal spray or electroplated surfaces.

FAQ

Is the HMM-240S compliant with ISO 9001 or ISO/IEC 17025 calibration requirements?
The instrument itself is not supplied with a factory calibration certificate traceable to NIST or national metrology institutes. However, its mechanical and optical subsystems are manufactured to dimensional tolerances aligned with ISO 10934-1, and users may implement periodic verification using certified stage micrometers and resolution test targets.
Can I connect the HMM-240S to a computer for advanced image analysis?
The base unit does not include HDMI or USB video output. Optional digital eyepieces with USB 2.0 interface are available as accessories, enabling live feed acquisition and compatibility with Windows/macOS-based analysis platforms.
What is the maximum working distance achievable at 40× magnification?
With the standard 40× metallurgical objective, the working distance is approximately 2.5 mm—sufficient for observing lightly covered or coated specimens without contact risk.
Does the LED illumination support color temperature adjustment?
No—the integrated LED provides fixed 5,500 K correlated color temperature, optimized for neutral gray-scale rendering of metallographic features under brightfield conditions.
Are replacement fuses or service manuals available internationally?
YANRUN provides English-language technical documentation and RoHS-compliant spare parts (including LED modules and focusing gears) through authorized regional distributors; lead times vary by territory and require formal OEM part-number referencing.