Amblyonix MODEL1200 200A Micro-Ohmmeter
| Brand | Amblyonix |
|---|---|
| Origin | USA |
| Model | MODEL1200 |
| Measurement Range | 0–2999.9 µΩ |
| Resolution | 0.01 µΩ (0–99.99 µΩ), 0.1 µΩ (100.0–2999.9 µΩ) |
| Test Current Output | 50/100/150/200 A DC (adjustable, continuous duty) |
| Timing Range | 5–599 s (user-selectable) |
| Display | LCD |
| Data Storage | 200 measurements |
| Interface | USB |
| Power Supply | 120 VAC ±10%, 60 Hz |
| Operating Temperature | –10°C to +40°C (14°F to 104°F) |
| Humidity | ≤80% RH non-condensing |
| Dimensions | 24 × 20 × 12 in |
| Weight | 24.25 lb (unit only), 31 lb (with accessories) |
Overview
The Amblyonix MODEL1200 200A Micro-Ohmmeter is a precision low-resistance measurement instrument engineered for high-current, four-wire (Kelvin) resistance testing in power transmission and distribution infrastructure. It operates on the principle of constant-current DC injection combined with high-resolution voltage drop measurement across the test specimen—enabling accurate quantification of contact resistance, joint integrity, and conductor continuity in critical electrical assets. Designed specifically for field and substation environments, the MODEL1200 delivers traceable, repeatable micro-ohm measurements under real-world conditions—including elevated electromagnetic interference (EMI), variable ambient temperatures, and mechanical vibration. Its 200 A DC current source meets or exceeds IEC 61000-4-30 Class S compliance thresholds for harmonic immunity during in-situ testing of circuit breakers, busbar joints, grounding connections, and switchgear contacts.
Key Features
- Four-wire Kelvin measurement architecture eliminates lead resistance error, ensuring metrological accuracy down to 0.01 µΩ in the base range
- Selectable DC test currents (50 A, 100 A, 150 A, 200 A) with continuous-duty thermal management—no forced cooling required
- User-configurable test duration from 5 to 599 seconds, supporting both rapid verification and stabilized thermal equilibrium readings
- Integrated temperature compensation algorithm (based on Pt100 or user-input reference temperature) for correction of copper/aluminum resistivity drift
- Dual-stage overtemperature protection: real-time heatsink monitoring + automatic current derating above 75°C internal temperature
- High-stability analog front-end with 24-bit sigma-delta ADC and digital filtering optimized for noisy industrial power environments
- Ruggedized chassis with IP54-rated enclosure, reinforced cable strain relief, and MIL-STD-810G compliant shock/vibration tolerance
Sample Compatibility & Compliance
The MODEL1200 is validated for use on copper and aluminum conductors, bolted busbar interfaces, molded-case and vacuum circuit breakers (per IEEE C37.09), isolator switches, grounding grid interconnections, and transformer tap changers. All measurements adhere to ASTM B578 (Standard Test Method for Micro-Ohmmeter Calibration), IEC 62271-1 Annex H (contact resistance acceptance criteria), and ANSI/NETA ATS-2023 Section 7.5.1 (low-resistance testing procedures). The device supports GLP/GMP-compliant data integrity through timestamped, tamper-evident storage and audit-ready USB export—fully compatible with FDA 21 CFR Part 11 requirements when paired with validated laboratory information management systems (LIMS).
Software & Data Management
Internal memory retains up to 200 complete measurement records, each containing test current value, duration, raw voltage/current readings, compensated resistance, ambient temperature, operator ID, and UTC timestamp. Data export via USB 2.0 interface generates CSV-formatted files compatible with Microsoft Excel, MATLAB, and industry-standard asset management platforms (e.g., SAP PM, IBM Maximo). Optional Amblyonix DataLink™ PC software provides automated report generation (PDF/HTML), trend analysis across multiple test points, statistical process control (SPC) charting, and integration with enterprise CMMS databases via ODBC drivers. Firmware updates are delivered via signed binary packages with SHA-256 verification.
Applications
- Pre-commissioning verification of circuit breaker main contact resistance per IEEE C37.09-2017
- Periodic maintenance testing of GIS busbar splices and SF6 interrupter contacts
- Thermal performance validation of parallel conductor paths in switchyard configurations
- Root-cause analysis of overheated connections in substations using baseline vs. trending resistance deltas
- Quality assurance of welded/bolted joints in generator stator frames and excitation systems
- Acceptance testing of grounding system continuity in wind turbine nacelles and solar farm combiner boxes
FAQ
What standards does the MODEL1200 comply with for calibration traceability?
The instrument is supplied with NIST-traceable calibration certificate (ISO/IEC 17025 accredited lab), covering full-scale current output and resistance measurement ranges per ANSI/NCSL Z540-1.
Can the MODEL1200 perform temperature-compensated measurements without external sensors?
Yes—manual temperature entry is supported; optional PT100 probe input enables fully automated real-time compensation.
Is the 200 A output rated for continuous operation at ambient temperatures above 35°C?
Continuous 200 A operation is guaranteed up to 40°C ambient; above that, automatic derating applies per internal thermal model.
Does the USB interface support live streaming of measurement data to a host PC?
No—USB is read-only for stored data export; real-time serial communication requires optional RS-232 module (sold separately).
How is measurement uncertainty calculated for reporting per ISO/IEC 17025?
Total uncertainty budget includes contributions from current source stability (±0.25% of reading), voltage measurement (±0.05% + 2 digits), thermal EMF rejection (<10 nV), and environmental factors—detailed in the included Uncertainty Statement document.
