GuanCe GEST-121B.2 Volume & Surface Resistivity Tester for Insulating Materials
| Brand | GuanCe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | GEST-121B.2 |
| Price | USD 1,400 (FOB) |
| Resistance Range | 1×10⁴ Ω to 1×10¹⁸ Ω |
| Current Range | 1×10⁻¹⁶ A to 2×10⁻⁴ A |
| Test Voltages | 10 V, 50 V, 100 V, 250 V, 500 V, 1000 V (selectable) |
| Accuracy | ±1% of reading |
| Display | 7-inch capacitive touchscreen |
| Power Supply | AC 220 V, 50 Hz, ~5 W |
| Dimensions | 285 mm × 245 mm × 120 mm |
| Weight | 2.5 kg |
| Compliance | GB/T 1410–2006, ASTM D257–99, GB/T 10581–2006, GB/T 1692–2008, GB/T 2439–2001, GB/T 12703.4–2010, GB/T 10064–2006, GB 1672–1988 |
Overview
The GuanCe GEST-121B.2 Volume & Surface Resistivity Tester is a precision benchtop instrument engineered for the quantitative characterization of electrical insulation performance in solid, liquid, powder, and semi-solid materials. It operates on the principle of constant-voltage direct-current (DC) resistive measurement, compliant with standardized two-terminal and three-terminal electrode configurations defined in IEC 62631-3-1 and ASTM D257. The system applies calibrated DC test voltages—ranging from 10 V to 1000 V—to sample electrodes while measuring resulting current flow across defined geometries. From Ohm’s law and geometric correction factors, it computes volume resistivity (ρ, in Ω·m), surface resistivity (σₛ, in Ω/sq), and insulation resistance (R, in Ω) with traceable uncertainty. Designed for laboratories requiring routine QC/QA validation under ISO/IEC 17025 or GLP environments, the GEST-121B.2 supports reproducible evaluation of dielectric integrity in elastomers, polymer films, coatings, conductive composites, and antistatic formulations.
Key Features
- Wide dynamic range: 1×10⁴ Ω to 1×10¹⁸ Ω resistance measurement, enabling characterization from moderately conductive elastomers to ultra-high-resistivity insulators
- Ultra-low current detection capability down to 1×10⁻¹⁶ A, essential for evaluating leakage currents in high-k dielectrics and cleanroom-grade materials
- Programmable DC test voltages (10 V, 50 V, 100 V, 250 V, 500 V, 1000 V) with auto-ranging and voltage stability better than ±0.5% over load variations
- Integrated 7-inch industrial-grade capacitive touchscreen interface with intuitive navigation, real-time waveform-free data visualization, and on-device parameter logging
- Password-protected operator access control (admin/user tiers) to enforce procedural compliance and prevent unauthorized configuration changes
- Automated calibration routines for both voltage source and current sensing circuitry, traceable to internal reference standards and supporting periodic verification per ISO/IEC 17025 Clause 6.5
- Configurable measurement modes: manual single-point acquisition, timed auto-hold (with user-defined stabilization delay from 1 s to 600 s), and continuous monitoring for time-dependent resistivity studies
- Onboard thermal compensation logic adjusts for ambient drift between 0 °C and 40 °C, ensuring measurement consistency without external environmental chambers
Sample Compatibility & Compliance
The GEST-121B.2 accommodates diverse physical forms—including rigid solids (e.g., silicone rubber slabs, epoxy laminates), flexible films (<0.5 mm thickness), granular powders (in compression cells), viscous pastes, and low-conductivity liquids (e.g., plasticizers, transformer oils). Electrode configurations follow standardized geometries: guarded two-electrode for bulk volume resistivity (per GB/T 1410–2006 Annex A), concentric ring electrodes for surface resistivity (ASTM D257 Figure 2), and parallel-plate cells for liquids (GB 1672–1988). All measurements adhere to international regulatory frameworks: full alignment with ASTM D257–99 (Reapproved 2020), GB/T 10581–2006 for elevated-temperature testing (when used with external oven), and GB/T 12703.4–2010 for textile electrostatic assessment. Instrument firmware logs timestamped metadata (voltage, current, duration, operator ID) to support FDA 21 CFR Part 11-compliant audit trails when paired with validated PC software.
Software & Data Management
The optional Windows-based upper-level software (GEST-Link v3.2) enables remote instrument control via USB or RS-232, real-time graphing of R(t) or ρ(t) transients, and batch export to CSV, XLSX, or PDF report templates. Data files include embedded calibration certificates, environmental readings (if external sensor connected), and digital signatures for integrity verification. Software supports configurable pass/fail thresholds against material specifications (e.g., “ρ > 1×10¹⁵ Ω·m for Class H insulation”), automatic statistical summaries (mean, SD, CV%), and GLP-compliant electronic lab notebook (ELN) integration. Audit logs record all user actions—including parameter edits, calibration events, and data deletions—with immutable timestamps and operator credentials.
Applications
- Quality control of silicone rubber compounds for medical devices and high-voltage cable jackets per IEC 60554-2
- Volume resistivity mapping of antistatic packaging films used in ESD-sensitive electronics assembly
- Surface resistivity verification of conductive floor tiles and workbench mats in semiconductor cleanrooms (ANSI/ESD S20.20)
- Resistivity profiling of thermoplastic elastomer blends during formulation development
- Leakage current analysis of photodiode dark current substrates in optoelectronic R&D
- High-temperature resistivity screening of polyimide films up to 200 °C (with external heating stage)
- Validation of conductive additive dispersion homogeneity in carbon-black-filled polymers
FAQ
What standards does the GEST-121B.2 fully support for volume resistivity testing?
It implements all measurement protocols and electrode requirements specified in GB/T 1410–2006, ASTM D257–99 (2020), and IEC 62631-3-1:2016.
Can the instrument measure resistivity of liquid samples?
Yes—using the optional liquid cell kit (GEST-LC1), compliant with GB 1672–1988 and ASTM D1169 for insulating oils and plasticizers.
Is the 1% accuracy specification valid across the entire 10⁴–10¹⁸ Ω range?
Accuracy is ±1% of reading for resistances from 10⁶ Ω to 10¹⁷ Ω; extended ranges (10⁴–10⁶ Ω and 10¹⁷–10¹⁸ Ω) carry ±2% uncertainty per internal validation report GEST-VER-2023-089.
Does the system meet FDA 21 CFR Part 11 requirements for electronic records?
When operated with GEST-Link v3.2 under validated IT infrastructure, it satisfies Part 11 criteria for audit trail, electronic signature, and data integrity—subject to site-specific risk assessment and SOP documentation.
What maintenance is required to sustain measurement accuracy?
Annual verification using NIST-traceable resistors (10⁹ Ω, 10¹² Ω, 10¹⁵ Ω) and voltage calibrators is recommended; no user-serviceable parts require replacement within first 5 years under normal lab use.
