PD IEC TR 61094-10-2022 PDF

Full title and description

Electroacoustics - Measurement microphones - Part 10: Absolute pressure calibration of microphones at low frequencies using calculable pistonphones. This Technical Report describes an absolute method based on calculable pistonphones for determining the complex pressure sensitivity of microphones, with emphasis on low-frequency and infrasound ranges.

Abstract

IEC TR 61094-10:2022 presents performance requirements and an absolute calibration method using calculable pistonphones to generate known sound pressure at low frequencies. It is intended to provide a reproducible, accurate basis for low‑frequency sound pressure measurement and to be applicable to laboratory standard microphones (meeting IEC 61094-1) and other measurement microphones; all quantities are expressed in SI units.

General information

• Status: Technical Report (published / active)
• Publication date: 4 August 2022 (IEC TR 61094-10:2022).
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.140.50 (Electroacoustics).
• Edition / version: Edition 1.0 (2022).
• Number of pages: 20 pages (base IEC publication).

Scope

The report is applicable to laboratory standard microphones meeting IEC 61094-1 and to other types of measurement microphones. It describes one absolute method for determining complex pressure sensitivity by using a device capable of generating a known sound pressure (calculable pistonphones), with particular attention to reproducible and accurate measurement at low frequencies (including infrasound ranges). The document expresses all quantities in SI units and provides guidance on device performance and uncertainty considerations for low‑frequency microphone calibration.

Key topics and requirements

• Definition and description of calculable pistonphone devices suitable for low‑frequency / infrasound calibration.
• Performance and construction requirements for pistonphones used as absolute sound‑pressure generators.
• Procedures for determining complex pressure sensitivity (magnitude and phase) at low frequencies.
• Uncertainty evaluation and statements to support traceability to SI units.
• Applicability to laboratory standard microphones (IEC 61094-1) and guidance for other measurement microphones.
• Recommendations for measurement environment, instrumentation and data handling specific to low‑frequency calibration.
• All quantities expressed in SI units.

Typical use and users

National metrology institutes, acoustical calibration laboratories, manufacturers of measurement microphones and microbarometers, research groups working on infrasound and low‑frequency acoustics, and specialized test laboratories use this Technical Report to establish or verify absolute low‑frequency calibration methods and to develop pistonphone-based primary or transfer standards for sound pressure.

Related standards

IEC TR 61094-10 is part of the IEC 61094 series on measurement microphones. Key related documents include IEC 61094-1 (Specifications for laboratory standard microphones), IEC 61094-2 (primary method for pressure calibration by reciprocity), IEC 61094-3 (reciprocity free‑field primary methods), IEC 61094-4 (specifications for working standard microphones) and supporting technical reports/TS such as IEC/TS 61094-7; users should consult those parts for complementary requirements and calibration methods.

Keywords

measurement microphones; pistonphone; calculable pistonphone; absolute pressure calibration; low frequency; infrasound; complex pressure sensitivity; primary calibration; traceability; SI units.

FAQ

Q: What is this standard?

A: IEC TR 61094-10:2022 is a Technical Report that specifies an absolute calibration method using calculable pistonphones for determining the complex pressure sensitivity of microphones at low frequencies (including infrasound) and gives performance and uncertainty guidance for such measurements.

Q: What does it cover?

A: It covers the principles and recommended procedures for absolute pressure calibration of microphones at low frequencies, performance requirements for pistonphone devices, uncertainty considerations and applicability to laboratory standard microphones and other measurement microphones; quantities are given in SI units.

Q: Who typically uses it?

A: Primary users are national metrology institutes, calibration laboratories, microphone and sensor manufacturers, and research teams working on infrasound / low‑frequency acoustics who need reproducible, traceable calibration methods.

Q: Is it current or superseded?

A: IEC TR 61094-10:2022 was published in 2022 as a current Technical Report; it is a new part in the 61094 series (edition 1.0) and is not listed as superseded. Users should check national adoption notices for any implementing documents or PD/identical publications by national bodies.

Q: Is it part of a series?

A: Yes — it is part of the IEC 61094 series (Measurement microphones). Complementary parts include IEC 61094-1 (laboratory standard specifications), IEC 61094-2 (pressure reciprocity primary method), IEC 61094-3, IEC 61094-4 and other parts/TS that cover related calibration and specification topics.

Q: What are the key keywords?

A: Measurement microphones, pistonphone, calculable pistonphone, absolute calibration, low frequency, infrasound, pressure sensitivity, primary calibration, traceability, SI units.