GuanCe GEST-121A4 Automated Insulation Resistivity Tester
| Brand | GuanCe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | GEST-121A4 |
| Price | USD 1,750 (FOB Beijing) |
Overview
The GuanCe GEST-121A4 Automated Insulation Resistivity Tester is a precision digital instrument engineered for high-accuracy measurement of insulation resistance, volume resistivity (ρv), and surface resistivity (ρs) in dielectric materials. Based on the constant-voltage direct-current (DC) method per ASTM D257 and IEC 62631-3-1, the system applies programmable test voltages (10 V to 1000 V DC) across standardized electrode configurations to determine resistive behavior under controlled environmental conditions. Its core architecture integrates a low-noise, high-input-impedance (>1016 Ω) measurement circuit with a proprietary analog front-end and Intel-based microcontroller processing, enabling stable, drift-compensated readings across an extended resistance range from 1 × 104 Ω to 2 × 1016 Ω — with resolution down to 0.01 MΩ at lower ranges and 0.1 TΩ at upper ranges. Designed for laboratory, QC, and R&D environments, the GEST-121A4 supports both manual and automated test sequences, delivering traceable, repeatable data essential for material qualification and process validation.
Key Features
- Programmable DC test voltage output: 10 V, 100 V, 250 V, 500 V, and 1000 V — selectable via front-panel interface or remote command
- Dual-mode measurement capability: simultaneous display of resistance (Ω), resistivity (Ω·cm or Ω/sq), and leakage current (fA to µA)
- Auto-ranging and auto-zeroing circuitry minimizes operator error and ensures optimal signal-to-noise ratio across full scale
- Integrated temperature and humidity sensor (±0.5 °C, ±3 % RH) enables real-time environmental compensation per ASTM D257 Annex A3
- Front-panel USB port and optional RS-232/RS-485 interfaces support firmware updates, data export, and SCPI-compatible remote control
- Robust aluminum chassis with EMI-shielded enclosure meets IEC 61326-1 for electromagnetic compatibility in industrial labs
Sample Compatibility & Compliance
The GEST-121A4 accommodates diverse sample geometries through interchangeable electrode fixtures — including guarded concentric ring electrodes (for surface resistivity per ASTM D257 Section 11), parallel plate electrodes (for volume resistivity per ASTM D257 Section 10), and liquid cell adapters (for conductive polymer dispersions or electrolyte solutions). It is validated for use with elastomers (e.g., silicone rubber, EPDM), thermoplastics (e.g., PE, PP, PET), ceramic substrates, powder compacts (via pelletized pressing), and non-aqueous gels. All measurements comply with international standards including ASTM D257 (Standard Test Methods for DC Resistance or Conductance of Insulating Materials), IEC 62631-3-1 (Dielectric and resistive properties – Part 3-1: Resistive properties – Volume resistivity and surface resistivity), and ISO 3915 (Electrical resistance of conductive plastics). The instrument’s calibration traceability follows ISO/IEC 17025 requirements, with optional NIST-traceable certificate available upon request.
Software & Data Management
The GEST-121A4 operates standalone but is fully compatible with GuanCe’s PC-based ResistivityLab v3.2 software (Windows 10/11, 64-bit). This application provides full GLP/GMP-aligned data handling: user-level access control (admin/operator modes), electronic signatures, audit trail logging (per FDA 21 CFR Part 11 requirements), and customizable report generation (PDF/CSV/XLSX). Test protocols can be pre-configured with pass/fail limits, ramp-up dwell times, and multi-step voltage sequences. Raw measurement data — including timestamp, ambient conditions, electrode ID, and statistical summaries (mean, SD, CV%) — are stored with immutable metadata. Exported datasets retain full metrological context for integration into LIMS or ERP systems.
Applications
- Quality control of insulating coatings on aerospace composites and printed circuit board laminates
- Development and specification of antistatic packaging films (e.g., HDPE/EVA blends with carbon black or metal oxide additives)
- Resistivity mapping of battery separator membranes (e.g., polyolefin microporous films) under dry and conditioned states
- Characterization of dielectric loss mechanisms in high-k polymer nanocomposites for capacitor applications
- Validation of cleaning efficacy in semiconductor wafer handling tools via surface resistivity monitoring
- Regulatory submission support for medical device insulation (ISO 10993-1 biocompatibility testing workflows)
FAQ
What is the recommended calibration interval for the GEST-121A4?
Annual calibration is advised under normal laboratory use; however, calibration verification using certified reference resistors (e.g., 109 Ω and 1012 Ω standards) should be performed before each critical test session.
Can the instrument measure resistivity of powders directly?
Yes — when used with the optional powder compression fixture (GEST-PF-01), which applies controlled pressure (1–10 MPa) to form reproducible pellets for volume resistivity determination per ASTM D150.
Does the system meet FDA 21 CFR Part 11 requirements?
When operated with ResistivityLab v3.2 in “Compliance Mode”, it satisfies electronic record and signature criteria, including audit trails, role-based permissions, and data integrity safeguards.
Is external humidity control required during testing?
While not mandatory, testing in a temperature- and humidity-controlled chamber (e.g., 23 ± 2 °C / 50 ± 5 % RH per ASTM D257) is strongly recommended to minimize environmental variability in comparative studies.
What safety certifications does the instrument hold?
It conforms to IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and carries CE marking for EMC and Low Voltage Directive compliance.
