Measurement Definitions

The Measurement Definitions section establishes the standardized terminology, parameters, and methodological rules used throughout the IRESS 2026 International Residential EMF Safety Standard. Its purpose is to ensure that all EMF measurements are consistent, repeatable, transparent, and comparable across residential properties, assessors, and certification levels.
All measurements conducted under the IRESS 2026 framework must follow these definitions unless explicitly stated otherwise.

General Measurement Principles

Reproducibility:
Measurements must be performed in a way that allows the same results to be obtained under comparable conditions.

Occupancy relevance:
Measurement locations and heights must reflect realistic human exposure during normal residential use of the space.

Source transparency:
The origin of measured fields (internal vs. external) must be identifiable wherever possible.

Non-averaged integrity:
Peak, typical, and background values must not be obscured by inappropriate averaging.

Measurement Locations

Measurements are conducted at locations representative of prolonged human presence. Priority is given to:

• Sleeping areas (beds, head position)

• Seating and resting zones

• Workspaces and desks

• Areas with known or suspected EMF sources

Measurements must be taken at a height and orientation appropriate to the field type being evaluated.

Low-Frequency (LF) Measurement Definitions

Magnetic Field (LF B-field)
Quantity: Magnetic flux density
Unit: Microtesla (µT)
Frequency range: 50 Hz – 60 Hz
Measurement condition:
Measured as RMS values, capturing both steady and variable loads.

Radio-Frequency (RF) Measurement Definitions

RF Field Strength
Quantity: Electric field strength
Unit: Volts per meter (V/m)
Frequency range: 100 kHz – 300 GHz
Measurement condition:
Measured as instantaneous and representative values under normal residential conditions.

RF Power Density
Quantity: Power density
Unit: Watts per square meter (W/m²)
Frequency range: 100 kHz – 300 GHz
Measurement condition:
Used where applicable for higher-frequency or far-field residential assessments.

Temporal Characteristics

EMF exposure may vary over time. Measurements must therefore consider:

• Background levels: Baseline exposure without active internal sources

• Typical levels: Exposure during normal living conditions

• Peak levels: Short-duration maximum values, where relevant

Time-dependent variability must be documented where it materially affects exposure assessment.

Instrumentation and Calibration

Measurement instruments must be appropriate for the frequency range and field type being assessed.
Instruments must be calibrated according to manufacturer specifications or recognised calibration standards.
The instrument model, measurement range, and relevant settings must be documented.

Documentation and Reporting

All measurements performed under the IRESS 2026 Standard must be documented in a clear and auditable manner.
Reports must include:

• Measurement locations and conditions

• Measured quantities and units

• Relevant environmental or operational notes

• Distinction between internal and external contributions

Measurement definitions in this section form the foundation for all evaluations, limits, and certification decisions under the IRESS 2026 International Residential EMF Safety Standard.