GuanCe GEST-121B5 Fully Automated Resistivity Tester
| Brand | GuanCe Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic |
| Model | GEST-121B5 |
| Price | USD 1,400 (FOB Beijing) |
Overview
The GuanCe GEST-121B5 Fully Automated Resistivity Tester is an engineered precision instrument designed for the quantitative determination of volume resistivity (ρv), surface resistivity (ρs), insulation resistance, and low-level DC current in solid, liquid, paste, and powdered dielectric and antistatic materials. Based on the four-terminal (Kelvin) measurement principle and compliant with standardized DC voltage–current methodology, the system applies controlled bias voltages—ranging from 10 V to 1000 V—in accordance with IEC 62631-3-1, ASTM D257, and GB/T 1410. Its architecture integrates high-impedance electrometer-grade circuitry capable of resolving currents as low as 1 × 10−16 A, enabling trace-level conductivity assessment critical for quality control in polymer compounding, semiconductor packaging, ESD-safe material development, and advanced functional coatings.
Key Features
- Fully automated resistivity calculation: Real-time derivation of ρv (Ω·cm) and ρs (Ω/sq) using user-input sample geometry parameters (thickness, electrode spacing, guard ring dimensions)
- Seven-step programmable test voltage selection: 10 V, 50 V, 100 V, 250 V, 500 V, and 1000 V—each selectable manually or via timed auto-sweep sequences
- 7-inch capacitive touchscreen interface with multilingual UI support (English default), password-protected access control (admin/operator tiers) to ensure procedural integrity and operator accountability
- Integrated automatic calibration routine for voltage source and current sensing path, traceable to internal reference standards; reduces drift-induced uncertainty over extended operation
- Dual-mode operation: Manual single-point measurement and time-stamped automatic acquisition with configurable dwell times (1 s to 9999 s per step)
- On-screen real-time display of applied voltage, measured current, raw resistance (Ω), derived resistivity (Ω·cm or Ω/sq), and measurement status indicators
- Low-power design: <5 W typical consumption; AC 220 V / 50 Hz input; compact footprint (285 × 245 × 120 mm) and lightweight chassis (2.5 kg) for benchtop deployment in QC labs and R&D cleanrooms
Sample Compatibility & Compliance
The GEST-121B5 supports standardized electrode configurations per ASTM D257 Annex A1 (two-electrode), A2 (three-electrode), and A3 (guarded two-electrode), enabling unambiguous separation of bulk and interfacial conduction pathways. It accommodates rigid solids (e.g., molded plastics, rubber sheets), flexible films (≥25 µm thickness), granular powders (via compressed pellet fixtures), conductive/antistatic liquids (using guarded liquid cells), and semi-solid pastes (with temperature-stabilized sample holders). The instrument conforms to regulatory and industrial testing requirements including GB/T 1410–2006, GB/T 10581–2006 (high-temperature resistivity), GB/T 1692–2008 (vulcanized rubber), GB/T 2439–2001 (elastomer conductivity), GB/T 12703.4–2010 (textile electrostatic evaluation), and GB/T 10064–2006. All measurements adhere to GLP-aligned documentation practices, with timestamped metadata embedded in exported datasets.
Software & Data Management
A Windows-compatible PC application (provided on USB drive) enables remote instrument control, script-based multi-sample sequencing, and long-term data archiving. The software supports CSV and XLSX export with full metadata (test date/time, operator ID, voltage setting, dwell time, raw I/V pairs, calculated ρv/ρs, pass/fail flags against user-defined limits). Audit trails record all parameter changes, calibration events, and user logins—fully compliant with FDA 21 CFR Part 11 requirements for electronic records when configured with digital signature and role-based access controls. Data can be imported into LIMS platforms via standard ODBC drivers.
Applications
- Volume and surface resistivity validation of insulating polymers (PE, PP, PTFE, epoxy resins) per IEC 60243 and UL 746
- ESD control qualification of flooring systems, footwear, workbenches, and packaging materials per ANSI/ESD S20.20
- Quality assurance of conductive fillers (carbon black, graphene, metal nanowires) in masterbatches and composites
- Dark current characterization of photodiodes and optoelectronic sensors under bias
- High-resistivity monitoring of transformer oils and silicone gels per ASTM D1169 and IEC 60247
- Research-grade resistivity mapping across temperature gradients (when paired with environmental chamber)
FAQ
What standards does the GEST-121B5 directly support?
It implements test protocols defined in ASTM D257, GB/T 1410, GB/T 10581, GB/T 1692, GB/T 2439, GB/T 12703.4, and GB/T 10064.
Can the instrument measure both volume and surface resistivity simultaneously?
No—it performs sequential measurements using appropriate electrode fixtures; users select mode (volume or surface) prior to test initiation.
Is external calibration required annually?
While internal auto-calibration compensates for short-term drift, annual third-party calibration against NIST-traceable standards is recommended for ISO/IEC 17025 compliance.
Does the system support statistical process control (SPC) output?
Yes—the PC software exports mean, SD, min/max, and Cp/Cpk values for batch-wise analysis when multiple replicates are acquired.
What safety certifications does the unit hold?
It meets GB 4793.1 (equivalent to IEC 61010-1) for electrical safety in laboratory equipment and includes reinforced insulation, leakage current monitoring, and emergency discharge circuitry.
