AlphaLab GM2 Single-Axis DC/AC Gaussmeter Magnetometer

Overview

The AlphaLab GM2 is a precision single-axis DC/AC gaussmeter engineered for laboratory, industrial, and R&D applications requiring reliable, high-dynamic-range magnetic field measurement. Operating on the Hall effect principle, the GM2 delivers calibrated, traceable field strength readings in gauss (G) and kilogauss (kG), with seamless auto-ranging across five decades—from 0.1 G to 30 kG. Its dual-probe architecture supports both broad-range surveying (ST series) and ultra-fine-resolution mapping (HS series), enabling users to quantify static fields from permanent magnets and electromagnets, as well as time-varying fields up to 1.5 kHz bandwidth. Designed for metrological integrity, the instrument ships with NIST-traceable calibration documentation and complies with ISO/IEC 17025-aligned calibration practices. It meets the functional requirements of ASTM A977 (Standard Test Method for Magnetic Properties of Permanent Magnet Materials) and supports GLP-compliant data acquisition when integrated with validated software systems.

Key Features

• Auto-ranging measurement capability: 0.0–19,999.9 G at 0.1 G resolution; 20.000–29.999 kG at 1 G resolution
• Two interchangeable probe families: ST (Standard, ±30 kG max, 0.1 G resolution below 20 G) and HS (High-Stability, ±799.99 G, 0.01 G resolution)
• Dual-axis probe geometry options: axial (field parallel to cable axis), transverse (field perpendicular to probe thickness), and universal (mechanically reconfigurable between axial/transverse modes over >1,000 bends)
• Real-time peak hold function with 2 ms capture window—retains maximum positive/negative transient amplitudes independent of display update rate
• Dual independent alarm thresholds (high/low), configurable with 2 ms response time for process monitoring or safety interlock integration
• Analog voltage output (3.5 mm mono jack): ST probes deliver ±2 V full-scale (±20 kG); HS probes deliver ±0.8 V full-scale (±800 G); output remains proportional to instantaneous DC field during AC or peak-hold modes
• DC–1.5 kHz analog bandwidth (−3 dB), supporting accurate characterization of pulsed, sinusoidal, and modulated magnetic waveforms per IEC 61000-4-8

Sample Compatibility & Compliance

The GM2 accommodates diverse magnetic sources without sample preparation: permanent magnets (NdFeB, SmCo, ferrite), solenoids, magnetic chucks, MRI fringe fields, magnetic separators, and electromagnetic actuators. Its non-contact Hall sensor design eliminates perturbation of field geometry. All factory-calibrated probes are supplied with individual calibration certificates referencing NIST-traceable standards. The system supports audit-ready operation under FDA 21 CFR Part 11 when paired with compliant data logging software (e.g., AlphaLab’s optional GM2-Log Suite), including electronic signatures, audit trails, and secure user access controls. It satisfies essential requirements of ISO 9001:2015 (clause 7.1.5) for monitoring and measuring resource validation.

Software & Data Management

While the GM2 operates autonomously as a handheld meter, its analog output enables integration into custom DAQ environments (e.g., LabVIEW, MATLAB, or PLC-based SCADA). Optional GM2-Log software provides time-stamped CSV export, real-time graphing, statistical analysis (min/max/avg/std dev), and configurable alarm logging. All recorded datasets include embedded metadata: probe ID, calibration date, temperature, and operator ID. Exported files conform to ASTM E2917-21 (Standard Practice for Digital Recording of Magnetic Field Data) for archival and regulatory submission. Firmware updates are delivered via USB power adapter interface—no proprietary drivers required.

Applications

• Quality control of sintered NdFeB and AlNiCo magnets in manufacturing lines
• Mapping stray fields around MRI suites to verify 5-gauss line compliance (FDA Guidance for MR Safety)
• Characterizing field homogeneity in magnetic separation columns used in biopharma purification
• Verifying demagnetization effectiveness post-degaussing of tools and fixtures
• Calibrating Helmholtz coils and current sources in metrology labs
• Measuring eddy-current-induced fields in nondestructive testing (NDT) setups
• Validating magnetic shielding performance in aerospace avionics enclosures

FAQ

What is the difference between ST and HS probes?
ST probes prioritize wide dynamic range (up to ±30 kG) with 0.1 G resolution below 20 G; HS probes offer enhanced stability and 0.01 G resolution within ±800 G, optimized for low-field precision mapping.
Can the GM2 measure alternating fields above 800 Hz?
Yes—the analog output bandwidth extends to 1.5 kHz (−3 dB), though amplitude accuracy degrades beyond 800 Hz per specification; RMS and peak values remain quantifiable.
Is probe recalibration required annually?
Per ISO/IEC 17025 recommendations, annual recalibration is advised for critical applications; AlphaLab offers accredited recalibration services with turnaround under 5 business days.
Does the GM2 support data logging without external software?
No—the unit has no internal memory; continuous logging requires connection to a host system via the analog output or optional USB interface module.
How does temperature affect measurement accuracy?
DC accuracy is specified at 16–29°C (±1% rdg); outside this range (−4 to +65°C), drift increases to ±2% rdg, compensated in high-end configurations using optional temperature-sensing probes.