GuanCe Instruments GEST-121B2 Fully Automated Resistivity Tester
| Brand | GuanCe Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Region of Manufacture | Domestic (China) |
| Model | GEST-121B2 |
| Price | USD 1,400 (FOB Beijing) |
Overview
The GuanCe Instruments GEST-121B2 Fully Automated Resistivity Tester is an engineered precision instrument designed for the quantitative determination of volume resistivity, surface resistivity, and insulation resistance of solid, liquid, powder, paste, and thin-film dielectric materials. It operates on the principle of constant-voltage direct-current (DC) measurement in accordance with standardized electrostatic charge decay and ohmic conduction methodologies. The system applies programmable test voltages (10 V to 1000 V DC) across defined electrode configurations—such as concentric ring, two-terminal, or guarded three-terminal arrangements—to isolate bulk versus interfacial conduction pathways. Its high-impedance measurement architecture supports reliable detection of currents as low as 1 × 10⁻¹⁶ A, enabling accurate characterization of ultra-high-resistivity materials commonly encountered in polymer science, semiconductor packaging, aerospace composites, and ESD-sensitive manufacturing environments.
Key Features
- Fully automated measurement workflow with configurable timing—user-selectable stabilization and reading intervals (1 s to 999 s) in Auto Mode
- 7-inch industrial-grade capacitive touchscreen interface with intuitive navigation, real-time parameter display (voltage, current, resistance, resistivity), and password-protected access control for operational integrity
- Integrated multi-range DC voltage source (10 V / 50 V / 100 V / 250 V / 500 V / 1000 V), switchable via software or front-panel controls
- Self-calibrating circuitry for voltage and current channels—performed at power-on and on-demand to maintain traceable accuracy within ±1% of reading (full-scale)
- Dual-mode operation: Manual mode for exploratory testing; Auto mode for standardized compliance testing per ASTM, GB, and ISO protocols
- Onboard thermal management and electromagnetic shielding ensure stable performance under ambient conditions (0–40 °C, RH <80%)
- Low-power design: AC 220 V, 50 Hz, ~5 W typical consumption—suitable for continuous lab deployment without cooling infrastructure
Sample Compatibility & Compliance
The GEST-121B2 accommodates diverse physical forms—including rigid and flexible polymers, elastomers (e.g., vulcanized rubber per GB/T 1692), insulating films, conductive/antistatic coatings, liquid plasticizers (per GB 1672), powders (with compression fixture), and semi-solid pastes—using standardized electrode fixtures compliant with IEC 62631-3-1, ASTM D257, and GB/T 1410. It satisfies full requirements for volume and surface resistivity testing under GB/T 10581 (high-temperature applications), GB/T 12703.4 (textile electrostatic evaluation), and GB/T 2439 (conductive rubber). All measurements are traceable to national metrological standards, and the instrument’s firmware architecture supports audit-ready operation in GLP and ISO/IEC 17025-accredited laboratories.
Software & Data Management
A Windows-compatible PC software suite (included) enables remote instrument control, real-time data streaming, and structured storage in CSV and XML formats. The software implements FDA 21 CFR Part 11-compliant user authentication, electronic signatures, and immutable audit trails—including timestamped records of voltage settings, dwell times, calibration events, and operator IDs. Test reports auto-generate with embedded metadata (test standard, sample ID, environmental conditions) and may be exported for integration into LIMS or QMS platforms. Local data retention includes up to 1,000 test records with full parameter history.
Applications
- Volume and surface resistivity mapping of insulating plastics and ceramics per ASTM D257 and GB/T 1410
- ESD qualification of flooring systems, footwear, and work surfaces (ANSI/ESD S20.20 alignment)
- Quality control of antistatic additives in polymeric compounds and masterbatches
- Resistivity profiling of battery separator films and dielectric layers in printed electronics
- Dark current analysis of photodiodes and optoelectronic components
- R&D support for functional nanocomposites, conductive inks, and ion-conducting gels
- High-temperature resistivity monitoring of thermosets during curing (with optional oven interface)
FAQ
What standards does the GEST-121B2 directly support?
It natively complies with GB/T 1410-2006, GB/T 2439-2001, ASTM D257-99, GB/T 10581-2006, and GB/T 12703.4-2010—enabling out-of-the-box execution of standardized test sequences.
Can the instrument measure both volume and surface resistivity without hardware reconfiguration?
Yes—via software-selectable electrode configuration modes and automatic guard-ring activation, eliminating manual wiring changes between test types.
Is the 1×10¹⁸ Ω upper resistance range verified under real-world lab conditions?
Yes—the specification reflects full-scale measurement capability at 1000 V with guarded input architecture and triaxial cabling; actual achievable range depends on sample geometry, humidity control, and surface cleanliness.
Does the system provide uncertainty budget documentation for ISO/IEC 17025 accreditation?
Yes—calibration certificates include expanded uncertainty (k=2) for voltage and current channels, referenced to CNAS-accredited primary standards.
How is data integrity ensured during long-duration high-resistance measurements?
The firmware implements real-time leakage compensation, adaptive filtering, and dual-slope integration to suppress noise and drift—critical for sub-picoampere stability over >60-second acquisitions.
