North Guang Precision Instruments BEST-212 Volume & Surface Resistivity Tester
| Brand | North Guang Precision Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | BEST-212 |
| Pricing | Upon Request |
Overview
The North Guang Precision Instruments BEST-212 Volume & Surface Resistivity Tester is a high-precision, microcurrent-capable electrometric system engineered for the quantitative characterization of electrical insulation properties in solid, liquid, and powdered materials. Based on the guarded two-terminal (for surface resistance) and three-electrode (for volume resistivity) measurement principles defined in ASTM D257 and IEC 60093, the instrument applies controlled DC test voltages—ranging from 10 V to 1000 V—to generate stable electric fields across standardized electrode configurations. It measures both volume resistivity (ρ, in Ω·m) and surface resistivity (σₛ, in Ω/sq), enabling compliance-driven evaluation of dielectric integrity in polymers, elastomers, composites, ceramics, and insulating powders. The system integrates real-time current sensing with automatic thickness compensation, eliminating manual calculation errors and supporting traceable, repeatable measurements under ISO/IEC 17025-aligned laboratory conditions.
Key Features
- Wide resistance measurement range: 1 × 10⁴ Ω to 1 × 10¹⁸ Ω, with extended low-end capability down to 0.01 × 10⁴ Ω
- Ultra-low current detection: 2 × 10⁻⁴ A to 1 × 10⁻¹⁶ A, optimized for high-resistivity material characterization
- Integrated six-step DC voltage source: 10 V, 50 V, 100 V, 250 V, 500 V, and 1000 V—user-selectable and digitally stabilized
- True-color 64-bit capacitive touchscreen interface with intuitive navigation and real-time dual-parameter display (resistance + resistivity)
- Automated resistivity computation: input sample thickness once; instrument calculates ρ or σₛ directly per ASTM D1711 and GB/T 1410–2006
- Onboard data storage with timestamped records, export-ready via USB interface for post-processing in Excel or LIMS environments
- Low power consumption (≈5 W) and compact benchtop footprint suitable for QC labs, R&D cleanrooms, and GLP-compliant testing suites
Sample Compatibility & Compliance
The BEST-212 accommodates heterogeneous sample geometries through modular electrode systems: a standard three-electrode fixture (ring, guard, and measuring electrodes) for volume resistivity of flat solids (e.g., rubber sheets, polymer films, glass plates); concentric ring electrodes for surface resistivity of non-porous substrates; and custom liquid cells or powder compaction dies for conductive/insulating liquids and granular media. All configurations comply with electrode geometry tolerances specified in GB/T 1410–2006, ASTM D257–14, and IEC 62631-3-1:2016. Environmental operation is validated between 0 °C–40 °C and <80% RH (non-condensing). Optional environmental chambers (temperature/humidity-controlled) enable accelerated aging studies per IEC 60243-1 and UL 746A protocols.
Software & Data Management
The embedded firmware supports full audit trail functionality—including operator ID, test voltage, duration, sample ID, and calibration timestamps—aligned with FDA 21 CFR Part 11 requirements for electronic records in regulated industries. Measurement data are stored internally with metadata tagging and exported as CSV files compatible with statistical process control (SPC) platforms. No external PC is required for routine operation; however, optional PC software provides advanced reporting (PDF/Excel), trend analysis, and multi-sample comparative charts. Firmware updates are delivered via secure USB flash drive, ensuring version control and traceability in GMP/QSR environments.
Applications
- Quality assurance of insulating materials in aerospace composites (e.g., carbon-fiber-reinforced polymers)
- Surface charge dissipation validation for ESD-safe packaging films and cleanroom garments
- Resistivity profiling of battery separator membranes and ceramic electrolytes
- Batch consistency verification of silicone elastomers used in medical device encapsulation
- Research-grade characterization of nanocomposite fillers (e.g., graphene oxide, CNTs) in polymer matrices
- Regulatory submission support for UL, CE, and RoHS compliance documentation
FAQ
What standards does the BEST-212 comply with?
ASTM D257, ASTM D1711, IEC 60093, IEC 62631-3-1, and GB/T 1410–2006.
Can it measure both volume and surface resistivity simultaneously?
No—it performs sequential measurements using appropriate electrode fixtures; switching requires manual reconfiguration per test method.
Is temperature or humidity control integrated?
Not natively; however, external environmental chambers can be interfaced, and sample conditioning parameters may be logged manually within the test record.
Does the instrument support GLP/GMP documentation requirements?
Yes—audit trails, electronic signatures (via optional login module), and calibrated voltage/current traceability meet core GLP and GMP data integrity expectations.
What electrode sets are included by default?
One complete three-electrode solid-sample fixture (compliant with ASTM D257 Fig. 1); liquid and powder electrodes are available as configurable accessories.
