IEC 61786-1:2013

Overview

IEC 61786-1:2013 (with amendments consolidated 2024) specifies requirements for measuring instruments used to assess human exposure to DC magnetic fields, AC magnetic fields and AC electric fields in the frequency range 1 Hz to 100 kHz. It covers instrument performance, magnitude ranges, calibration and uncertainty for field strength measurement of quasi‑static fields (including static/DC fields such as the earth’s magnetic field). The standard is a horizontal publication (IEC Guide 108) and complements Part 2 (measurement procedures).

Key topics and technical requirements

• Frequency and field ranges: instruments for 1 Hz–100 kHz; magnitude coverage typically 0.1 μT to 200 mT (AC), 1 μT to 10 T (DC) and 1 V/m to 50 kV/m (electric field).
• Instrumentation specifications: pass‑band, readability, operating temperature/humidity, weight and mechanical durability, probe selection (single‑ and three‑axis probes), and instrument dimensions.
• Measurement uncertainty and calibration: mandatory calibration procedures, calibration systems for magnetic and electric field meters, documentation and calibration uncertainty evaluation. The standard advises special attention when measuring outside stated magnitude ranges.
• Electromagnetic compatibility (EMC): immunity and emissions requirements to ensure meter accuracy in real environments.
• Crest factor and dynamic response: requirements to handle non‑sinusoidal waveforms (harmonics and transients) found near power equipment.
• Verification and traceability: guidance on periodic verification and links to reference instruments and calibration methods (coil/Helmholtz setups, plate systems, injection techniques).

Applications and who uses this standard

IEC 61786-1 is intended for professionals involved in accurate EMF assessment and instrument design:

• Test and calibration laboratories establishing traceable calibration for EMF meters.
• Manufacturers of magnetic and electric field meters designing instruments and probes to meet performance and EMC requirements.
• Occupational health & safety teams, utilities and power companies assessing worker and public exposure near power lines, substations and industrial equipment.
• Regulators and compliance auditors enforcing exposure limits and documenting measurement procedures (used together with Part 2).
• Researchers and consultants performing exposure assessments, epidemiological support or environmental surveys.

Related standards

• IEC 61786-2 - Measurement procedures (complements Part 1).
• IEC Guide 108 - horizontal standard guidance.
• The consolidated edition includes amendments to the original IEC 61786:1998, providing up‑to‑date calibration and instrumentation guidance.

Keywords: IEC 61786-1:2013, DC magnetic fields, AC magnetic fields, AC electric fields, 1 Hz to 100 kHz, measuring instruments, calibration, measurement uncertainty, EMF meters, human exposure.