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17 Metrology and measurement. Physical phenomena
New standards
IEC/IEEE 62704-1:2026
Determining the peak spatial-average specific absorption rate (SAR) in the human body from wireless communications devices, 100 kHz to 10 GHz - Part 1: General requirements for using the finite-difference time-domain (FDTD) method for SAR calculations
Scope:
IEC/IEEE 62704-1:2026 defines the methodology for the application of the finite-difference time domain (FDTD) technique when used for determining the peak spatial-average specific absorption rate (psSAR) in the human body exposed to wireless communication devices with known uncertainty. It defines methods to validate the computational model of the device under test (DUT) and to assess its uncertainty when used in SAR simulations. Moreover, it defines procedures to determine the psSAR in a cubical volume and to verify the correct implementation of the FDTD simulation software. The applicable frequency range is 100 kHz to 10 GHz.
This document does not recommend specific SAR limits; these are found elsewhere, for example, in the guidelines published by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) or in IEEE Std C95.1.
This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) specification of a SAR averaging algorithm for the calculation of the psSAR from computational results for arbitrarily shaped homogeneous phantoms, which avoids inconsistencies with respect to the algorithm for SAR averaging algorithm specified in IEC/IEEE 62209-1528 for SAR measurement methods;
b) provision of SHA-256 checksums for all supplemental files;
c) addition of brief informative discussion on developmental stages of IEC and IEEE computational modelling standards for SAR evaluations.
This document does not recommend specific SAR limits; these are found elsewhere, for example, in the guidelines published by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) or in IEEE Std C95.1.
This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) specification of a SAR averaging algorithm for the calculation of the psSAR from computational results for arbitrarily shaped homogeneous phantoms, which avoids inconsistencies with respect to the algorithm for SAR averaging algorithm specified in IEC/IEEE 62209-1528 for SAR measurement methods;
b) provision of SHA-256 checksums for all supplemental files;
c) addition of brief informative discussion on developmental stages of IEC and IEEE computational modelling standards for SAR evaluations.
Base documents:
Replaces:
IEC/IEEE 62704-1:2017
Replaced standards
IEC 61065:1991/COR1:1993
Corrigendum 1 - Method for evaluating the low temperature flow properties of mineral insulating oils after ageing
Scope:
Base documents:
IEC 61065:1991
Method for evaluating the low temperature flow properties of mineral insulating oils after ageing
Scope:
Describes a method for assessing the changes in activity of pour point depressant additives in inhibited and uninhibited mineral insulating oils when aged in the presence of insulating kraft paper.
The contents of the corrigendum of December 1993 have been included in this copy.
The contents of the corrigendum of December 1993 have been included in this copy.
Base documents:
IEC/IEEE 62704-1:2017
Determining the peak spatial-average specific absorption rate (SAR) in the human body from wireless communications devices, 30 MHz to 6 GHz - Part 1: General requirements for using the finite difference time-domain (FDTD) method for SAR calculations<br />
Scope:
IEC/IEEE 62704-1:2017(E) defines the methodology for the application of the finite-difference time domain (FDTD) technique when used for determining the peak spatial-average specific absorption rate (SAR) in the human body exposed to wireless communication devices with known uncertainty. It defines methods to validate the numerical model of the device under test (DUT) and to assess its uncertainty when used in SAR simulations. Moreover, it defines procedures to determine the peak spatial-average SAR in a cubical volume and to validate the correct implementation of the FDTD simulation software. The applicable frequency range is 30 MHz to 6 GHz.
This document does not recommend specific SAR limits since these are found elsewhere, for example, in the guidelines published by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) [1] or in IEEE Std C95.1 [3].
This document does not recommend specific SAR limits since these are found elsewhere, for example, in the guidelines published by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) [1] or in IEEE Std C95.1 [3].
Base documents:
Replaced:
IEC/IEEE 62704-1:2026
Drafts
prEN IEC 63440:2026
Ultrasonics - Measurement of temperature rise produced by medical ultrasonic equipment
Scope:
This document is applicable to medical ultrasonic equipment capable of inducing a temperature increase at the patient contact surface.
This document supports the safety standards through providing the details of temperature measurements required to confirm with safety requirements therein. It establishes:
– the important characteristics, calculations and terminology for determining temperature rise for diagnostic and physiotherapy ultrasound equipment;
– requirements for temperature rise measurements for each type of medical ultrasound equipment;
– general test methods for still air and using test objects to determine standardized temperature.
This document does not address methods for simulation of temperature.
This document supports the safety standards through providing the details of temperature measurements required to confirm with safety requirements therein. It establishes:
– the important characteristics, calculations and terminology for determining temperature rise for diagnostic and physiotherapy ultrasound equipment;
– requirements for temperature rise measurements for each type of medical ultrasound equipment;
– general test methods for still air and using test objects to determine standardized temperature.
This document does not address methods for simulation of temperature.
Base documents:
87/949/CDV; prEN IEC 63440:2026
prEN ISO 25178-607
Geometrical product specifications (GPS) - Surface texture: Areal - Part 607: Design and characteristics of non-contact (confocal microscopy) instruments (ISO/DIS 25178-607:2026)
Scope:
This document specifies the design and metrological characteristics of confocal microscopy instruments for areal measurement of surface topography. Because surface profiles can be extracted from areal surface topography data, the methods described in this document can also be applied to profiling measurements.
Base documents:
ISO/DIS 25178-607; prEN ISO 25178-607
prEN IEC 60942:2026
Electroacoustics - Sound calibrators
Scope:
The primary function of a sound calibrator is to generate a sinusoidal sound pressure of specified level and frequency when coupled to specified models of microphone in specified configurations.
This document specifies the performance requirements for three classes of sound calibrator:
class LS (Laboratory Standard), class 1 and class 2. Acceptance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the laboratory; class 1 and class 2 sound calibrators are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC 61672-1, and with a personal sound exposure meter, as specified in IEC 61252 [3].
To promote consistency of testing of sound calibrators and ease of use, this document contains normative information on pattern evaluation tests and periodic tests, and informative information on assessments of conformance to specifications of this document.
This document does not include requirements for equivalent free-field or random-incidence sound pressure levels, such as can be used in the overall sensitivity adjustment of a sound level meter.
A sound calibrator can provide other functions, for example, tonebursts. Requirements for these other functions are not included in this document.
This document specifies the performance requirements for three classes of sound calibrator:
class LS (Laboratory Standard), class 1 and class 2. Acceptance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the laboratory; class 1 and class 2 sound calibrators are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC 61672-1, and with a personal sound exposure meter, as specified in IEC 61252 [3].
To promote consistency of testing of sound calibrators and ease of use, this document contains normative information on pattern evaluation tests and periodic tests, and informative information on assessments of conformance to specifications of this document.
This document does not include requirements for equivalent free-field or random-incidence sound pressure levels, such as can be used in the overall sensitivity adjustment of a sound level meter.
A sound calibrator can provide other functions, for example, tonebursts. Requirements for these other functions are not included in this document.
Base documents:
29/1244/CDV; prEN IEC 60942:2026