edVirtus Reference

IEC/IEEE 62209-1528:2020—Measurement Procedure for the Assessment of Specific Absorption Rate of Human Exposure to Radio Frequency Fields from Hand-Held and Body-Mounted Wireless Communication Devices—Part 1528: Human Models, Instrumentation, and Procedures (Frequency Range of 4 MHz to 10 GHz)

Preview: Learn more about IEC/IEEE 62209-1528 and its procedures for measuring specific absorption rate from hand-held and body-mounted wireless devices.

IEC/IEEE 62209-1528:2020 is the principal international measurement standard for evaluating specific absorption rate (SAR) produced by wireless communication devices used close to the head or body. It specifies reproducible and repeatable procedures for determining conservative peak spatial-average SAR within simplified human models, together with the associated measurement uncertainty. The standard is intended primarily for product-compliance testing rather than workplace or environmental RF surveys.

The document is an IEC/IEEE Dual Logo standard prepared by IEC Technical Committee 106, Methods for the Assessment of Electric, Magnetic and Electromagnetic Fields Associated with Human Exposure, in cooperation with the IEEE International Committee on Electromagnetic Safety. It was published on 19 October 2020 as a 280-page first edition.

Background and consolidation

IEC/IEEE 62209-1528 combines several earlier standards that had separately addressed devices used next to the ear and devices used against or near the body. It cancels and replaces IEC 62209-1:2016, IEC 62209-2:2010, IEC 62209-2:2010/AMD1:2019, and IEEE Std 1528-2013. The consolidation gives manufacturers, regulators, and laboratories a common set of human models, instrumentation requirements, positioning procedures, validation methods, and uncertainty principles.

The technical revision also broadened the covered frequency range to 4 MHz–10 GHz. Other major changes included procedures for devices with proximity sensors, application-specific phantoms, more detailed device-holder specifications, fast SAR testing, test-reduction procedures, LTE assessment, revised validation antennas and SAR assessment procedures, time-averaged SAR measurement, and expanded uncertainty analysis.

Purpose and scope

The standard measures the conservative peak spatial-average SAR induced by an RF transmitting device inside a simplified model of the head or body. Its procedures apply to devices whose radiating structures operate at distances up to 200 mm from the user. They are intended to represent a significant majority of the population, including children, while providing standardised test conditions that can be reproduced by different laboratories.

Covered use configurations include devices used next to the ear, held in front of the face, mounted on or supported against the body, used with RF-transmitting or non-transmitting accessories such as belt clips, and embedded in garments. The device under test may contain one or several transmitters or antennas and may operate in several frequency bands or modes.

Examples include mobile and cordless telephones, cordless microphones, push-to-talk radios, and transmitters incorporated into desktop, laptop, and other personal computers. The procedures can also be applied to wireless power-transfer devices operating above 4 MHz. The examples are not exhaustive; applicability depends on frequency, separation distance, operating configuration, and whether the equipment can be represented using the phantoms and procedures defined by the standard.

IEC/IEEE 62209-1528 does not apply to implanted medical devices. It also does not establish the numerical SAR limit against which a result is judged. The applicable limit, averaging mass, exposure category, and regulatory decision rule come from the relevant national regulation, equipment-authorisation regime, or exposure-limit standard.

Specific absorption rate and the compliance quantity

SAR describes the rate at which RF energy is absorbed per unit mass of tissue and is expressed in watts per kilogram. For local exposure from a device used close to the body, the compliance quantity is normally a spatial average over a specified tissue mass. IEC/IEEE 62209-1528 provides the procedure for locating and evaluating the peak spatial-average SAR, or psSAR, within the phantom. Depending on the applicable regulatory framework, results may be evaluated over 1 g or 10 g of tissue-equivalent material.

The use of a peak spatial average is important because absorption around a small antenna is highly non-uniform. A whole-body average or a field measurement outside the body would not adequately describe the local maximum produced close to the device. The standard therefore uses a scanning process to find the region of highest SAR and then evaluates the spatial average within the prescribed volume.

Human models and test phantoms

The test system uses simplified physical phantoms rather than measurements in people. For devices used at the ear, the standard employs a standardised anthropomorphic head model that provides repeatable left- and right-side test positions. Flat phantoms and other application-specific arrangements are used for body-mounted, body-supported, face, limb, or other defined exposure configurations.

The phantom shell is filled with tissue-equivalent liquid having specified dielectric properties at the test frequency. The liquid, shell, device holder, and separation distance influence the measured field and must therefore meet the relevant specifications. The standard includes requirements for checking liquid properties and for controlling mechanical tolerances, device positioning, and holder perturbation.

Measurement system and validation

A conventional SAR measurement system generally comprises a phantom, tissue-equivalent medium, an isotropic electric-field probe, a robotic or otherwise controlled scanning mechanism, data-acquisition electronics, positioning equipment, and software for reconstructing and spatially averaging SAR. The probe must be calibrated for the applicable frequencies and media, and its response, linearity, isotropy, boundary effects, spatial resolution, and other performance characteristics contribute to the uncertainty budget.

System checking confirms that the equipment is operating properly before or during a series of tests. System validation demonstrates that the complete measurement system can reproduce reference SAR values using specified antennas and configurations. Normative annexes provide validation arrangements and antennas, while separate provisions address fast-SAR system checks and validation. These controls help make results comparable between laboratories and reveal faults that might not be apparent from a successful scan alone.

Device preparation and operating conditions

The equipment under test must be configured to represent the relevant exposure condition and a conservative transmitting state. The laboratory identifies supported frequency bands, channels, modulations, antennas, simultaneous-transmission combinations, power-control behaviour, accessories, and physical configurations. Test modes or communication links may be used to maintain controlled transmission while monitoring output power and device operation.

A result is normally related to the device’s specified maximum or otherwise defined time-averaged output power. Output-power drift, battery state, thermal behaviour, duty factor, antenna selection, and operating mode can affect the measured SAR. The procedures therefore include reference measurements, power monitoring, and scaling or normalisation rules appropriate to the selected test configuration.

Positioning and scanning

Repeatable positioning is central to the method because small changes in angle, separation, or alignment can change local SAR. Devices used at the ear are assessed in prescribed cheek and tilted positions on the relevant sides of the head phantom. Body and face configurations use defined orientations and separation distances, including the effects of accessories or built-in spacing where required by the applicable compliance regime.

The measurement process first searches an area or volume to locate the likely SAR maximum. A higher-resolution zoom scan is then performed around each relevant maximum, followed by interpolation, extrapolation near the phantom boundary where required, and calculation of the peak spatial-average value. The scan region and averaging volume must be large enough to contain the relevant maximum rather than truncating the evaluated mass at the edge of the measurement volume.

Multiple bands, antennas, and modern device features

Modern wireless products can support many bands, radio technologies, antennas, and physical configurations. Testing every possible combination may be unnecessary yet simply selecting one convenient mode would not be conservative. IEC/IEEE 62209-1528 therefore includes procedures for identifying the configurations most likely to produce the highest SAR, assessing multi-band and multiple-antenna devices, and reducing tests when supported by defined technical or statistical criteria.

The standard includes LTE-specific assessment provisions and addresses devices whose transmit power or operating mode depends on proximity sensing. A proximity sensor may cause the device to reduce power when it detects the user or a test phantom. The test procedure must verify relevant sensor states, activation distances, and output-power behaviour so that the compliance assessment represents foreseeable use rather than an artificial laboratory condition.

Fast SAR and test reduction

Full high-resolution SAR testing can be time-consuming when a device has many bands and configurations. Fast-SAR systems and screening procedures may be used to identify the configurations likely to produce the greatest exposure. Test-reduction provisions then allow the detailed test program to be reduced where specified comparisons, margins, device characteristics, or statistical evidence justify doing so.

These provisions do not lower the applicable SAR limit. Their purpose is to locate the worst credible configuration efficiently while retaining a conservative compliance result. A jurisdiction may qualify how fast-SAR measurements are used—for example, accepting them for relative screening while requiring a conventional full measurement for the final absolute compliance result.

Time-averaged SAR

Some devices use dynamic power control and exposure time averaging, allowing short periods at higher output power while maintaining the required average over the regulatory averaging interval. IEC/IEEE 62209-1528 includes a time-period-averaged SAR procedure intended to evaluate this behaviour. The laboratory must consider the implemented algorithm, power history, averaging window, supported modes, and the relationship between measured SAR and transmitter power.

Regulators may supplement or replace this procedure with jurisdiction-specific requirements for validating time-averaging algorithms. The standard therefore supplies an international measurement foundation, but it does not eliminate the need to consult the current equipment-authorisation rules applying to the product.

Measurement uncertainty and reporting

A defined uncertainty is part of the result rather than an optional laboratory note. Contributions can arise from probe calibration and isotropy, liquid dielectric properties, field gradients, spatial sampling, boundary correction, device positioning, holder effects, output-power drift, environmental RF fields, modulation response, reconstruction, and numerical spatial averaging. The significant components are evaluated and combined into an uncertainty budget.

The final report documents the device and its hardware and software versions, frequencies and operating modes, antennas, test configurations, accessories, separation distances, phantom and liquid properties, instrumentation and calibration, system checks, measurement results, power normalisation, uncertainty, test reductions, and the applied compliance criteria. Sufficient detail is required to understand how the worst-case configuration was selected and to reproduce the assessment.

Relationship to exposure limits and other standards

IEC/IEEE 62209-1528 determines how SAR is measured; it does not decide which health-based exposure limits apply. A manufacturer or laboratory must use it with the limits and administrative requirements specified by the relevant authority. Consequently, national regulators may adopt the standard with stated exceptions, additional test positions, different averaging masses, technology-specific procedures, or separate requirements for time-averaging algorithms.

There is an intentional overlap between 6 and 10 GHz. IEC/IEEE 62209-1528 permits SAR assessment through 10 GHz, while the IEC/IEEE 63195 series provides incident power-density assessment procedures beginning at 6 GHz. The standard’s introduction recognises this overlap and allows the compliance metric appropriate to the applicable exposure framework and product case to be used.

Related documents include IEC 62209-3 for vector measurement-based SAR systems, IEC TR 63424-1 for validation of dynamic power-control and exposure-time-averaging algorithms in cellular implementations up to 6 GHz, and national regulatory measurement procedures. These documents complement rather than automatically replace the requirements of IEC/IEEE 62209-1528.

Amendment status

An amendment designated IEC/IEEE 62209-1528a-2026 was approved by the IEEE Standards Association in July 2026, while IEC listed Amendment 1 as a pre-release publication. The amendment addresses hand-SAR applicability and testing, motion-sensor procedures and validation, revised time-averaged SAR algorithm validation, separation distance and test reduction, and proximity sensors. Until the amendment is formally published and adopted by the relevant authority, the 2020 edition remains the operative base document and the amendment should be identified separately.

Practical significance

IEC/IEEE 62209-1528 is central to the conformity assessment of mobile phones, portable radios, computers with embedded transmitters, and other wireless products used close to the body. It harmonises procedures that were previously divided among several IEC and IEEE documents and provides a common basis for manufacturers, accredited laboratories, regulators, and certification bodies.

Its value lies in disciplined reproducibility. The standard connects a defined phantom, calibrated measurement system, controlled device state, conservative positioning, search for the spatial maximum, uncertainty evaluation, and complete report. These elements allow a localised RF exposure result to function as credible evidence of product compliance rather than merely as a laboratory reading.