Low-field lab testing zero-gauss chamber DXGE-30S

Overview
The DXGE-30S geomagnetic field compensation system provides real-time offset of geomagnetic field fluctuations to produce controlled low-nT magnetic environments. It can create a 10 nT zero magnetic environment in standard geomagnetic conditions and generate gradient fields of 1 nT or 0.1 nT inside a shielding room or cylinder. The system also produces user-defined magnetic field profiles for scientific experiments and geomagnetic change simulation. Recommended for aerospace, defence, research laboratories and universities where precise field control is required.

System composition

• Magnetic flux generating device: a set of three-dimensional Helmholtz coils with three corresponding power supplies (one per axis) to generate the uniform magnetic field required for experiments.
• Three-dimensional coils: dedicated coil for each axis; a high-precision imported fluxgate probe is positioned at the centre for closed-loop feedback and field adjustment.
• Feedback & control: fluxgate probe signals are processed by the host computer, which adjusts currents of high-precision power supplies to achieve precise geomagnetic compensation and to generate requested field profiles.
• Magnetic field measuring device: DX-330F fluxgate meter with probe for real-time measurement in the central uniform region and feedback to the controller.

System performance indicators

• Coil frame material: GFRP (glass-fiber reinforced polymer) or aviation-grade aluminum.
• Center-field uniformity options: better than 1%, 0.5%, 0.1% or 0.05% (configurable).
• Uniform zone size: selectable from 50 mm up to 3000 mm (customizable to application).
• Central magnetic field strength: 1–10 Gs (0–1,000,000 nT).
• Fluxgate probe resolution: selectable 0.1 nT or 1 nT.
• Fluxgate bias stability: 5 nT (24 h, ambient temperature change < 3°C).
• Power supply current resolution: typical 10 μA or 100 μA.
• Current stability/variation accuracy: 1/100000 or 1/50000.
• Adjustment step in geomagnetic environment: ~10 nT–20 nT.
• Average coil diameter: per customer requirements.

Three-dimensional Helmholtz coil (specification table)
Diameter (m): 1 | 2 | 3 | 4 | 5
Homogeneity range (cm): 25 | 50 | 75 | 100 | 125
Uniformity: 0.01 | 0.01 | 0.01 | 0.01 | 0.01
Magnetic field (Gs): 1 | 5 | 10 | 15 | 20

Examples (1 m) — Three-dimensional Helmholtz coil (example parameters)
Parameter | X-axis coil assembly | Y-axis coil assembly | Z-axis coil assembly
Magnetic field strength: 110 μT ± 10 μT | 110 μT ± 10 μT | 110 μT ± 10 μT
B/I coefficient: 110 μT ± 10 μT/A | 110 μT ± 10 μT/A | 110 μT ± 10 μT/A
Magnetic field resolution: 1.1 ± 0.1 nT | 1.1 ± 0.1 nT | 1.1 ± 0.1 nT
Continuous service current: 1 A | 1 A | 1 A
Instantaneous maximum current: 2.1 A | 2.1 A | 2.1 A
Equivalent side length: 1126 mm | 1062 mm | 998 mm
Equivalent spacing: 613 mm | 578 mm | 543 mm
Direct-current resistance @20°C: 18.1 Ω ± 1.3 Ω | 16.1 Ω ± 1.1 Ω | 14.2 Ω ± 1.0 Ω
Electrical inductance: ~64 mH | ~53 mH | ~43 mH
Weight: 102 kg | 102 kg | 102 kg

Simulation data
Simulation images and numerical results illustrating three-dimensional Helmholtz coil behaviour and field uniformity are provided on the product page to support design validation and experimental planning.

Technical specifications

• Model: DXGE-30S geomagnetic dynamic analog shielding system.
• Primary function: real-time compensation of geomagnetic field fluctuations to produce controlled low-nT magnetic environments, including 10 nT zero environment and 1 nT/0.1 nT gradient fields.
• Applications: aerospace, defence, research institutes, universities, material characterisation and magnetic shielding studies.
• Coil materials: GFRP or aviation-grade aluminum.
• Uniformity options: center uniformity better than 1%, 0.5%, 0.1% or 0.05% (configurable).
• Uniform zone sizes: 50 mm up to 3000 mm (customisable).
• Central magnetic field range: 1–10 Gs (0–1,000,000 nT).
• Fluxgate resolution: 0.1 nT or 1 nT selectable.
• Fluxgate bias stability: 5 nT over 24 h (ΔT < 3°C).
• Power supply accuracy: typical 10 μA or 100 μA.
• Power variation accuracy: 1/100000 or 1/50000.
• Adjustment step under geomagnetic environment: ~10 nT–20 nT.
• Available coil diameters: 1 m, 2 m, 3 m, 4 m, 5 m (other sizes on request).
• Example 1 m coil parameters: magnetic field ~110 μT ± 10 μT; B/I ~110 μT/A ± 10 μT/A; resolution ~1.1 ± 0.1 nT; continuous current 1 A; peak 2.1 A; DC resistance ~18.1 Ω ± 1.3 Ω; inductance ~64 mH; weight ~102 kg per axis.
• Measurement instrument: DX-330F fluxgate meter and probe for centre-field real-time measurement and closed-loop feedback.
• Control & feedback: host computer processes probe signals and controls high-precision power supplies to achieve precise shielding and required field profiles.