IEC 61260-1-2014 PDF

Full title and description

IEC 61260-1:2014 — Electroacoustics — Octave‑band and fractional‑octave‑band filters — Part 1: Specifications. This international standard specifies performance requirements for analogue, sampled‑data and digital implementations of band‑pass filters used for octave and fractional‑octave spectral analysis (class 1 and class 2 filter performance, maximum permitted measurement uncertainties, and environmental operating ranges).

Abstract

IEC 61260‑1:2014 defines the design goals, acceptance limits and measurement uncertainty limits for octave and fractional‑octave band‑pass filters used in acoustical measurements. It covers filter design parameters (mid‑band and band‑edge frequencies, normalized response), classification into class 1 and class 2, required environmental ranges for instruments, and the methods for demonstrating conformance. The standard replaces the earlier IEC 61260 (1995) edition and establishes the specifications used by instrument manufacturers and test laboratories.

General information

• Status: Valid (first edition, current international standard).
• Publication date: Approved 14 February 2014 (published 2014).
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.140.50 — Electroacoustics.
• Edition / version: Edition 1.0 (IEC 61260‑1:2014).
• Number of pages: 88 pages (typical IEC publication pagination).

Scope

Specifies performance requirements and conformance criteria for octave and fractional‑octave band‑pass filters implemented as analogue, sampled‑data or digital filters. The standard sets the definitions and formulas for exact mid‑band and band‑edge frequencies (using the octave ratio G = 10^(0.3)), relative attenuation and normalized response, assigns filter classes (class 1 and class 2) with corresponding acceptance limits and maximum permitted expanded measurement uncertainties, and describes environmental conditions for instruments used in laboratory or field operation.

Key topics and requirements

• Definitions and formulas for exact mid‑band, lower/upper band‑edge frequencies and normalized bandwidth (including octave frequency ratio G = 10^(0.3)).
• Performance classes: class 1 and class 2 with different acceptance limits and operational temperature ranges.
• Design goals and allowable deviations (tolerance/acceptance intervals) and procedures to demonstrate conformance.
• Maximum‑permitted expanded uncertainties of measurement and guidance for laboratories to verify their actual uncertainties against those limits.
• Applicability to analogue, sampled‑data and digital implementations and to instruments such as spectrum analysers and sound level meters that include octave filters.
• Specification of environmental/operational ranges depending on controlled laboratory or field use.

Typical use and users

Manufacturers of acoustical instrumentation (spectrum analyzers, sound level meters and octave‑filter modules), calibration and test laboratories, metrology institutes, and researchers in acoustics use IEC 61260‑1:2014 to design, evaluate and certify octave and fractional‑octave filters and to ensure measurement traceability and repeatability in spectral analyses. National adoption documents (for example ANSI/ASA S1.11 in the United States) frequently mirror this IEC specification for national compliance.

Related standards

Commonly referenced and complementary standards include: IEC 61260‑2 (pattern‑evaluation tests) and IEC 61260‑3 (periodic tests) which provide test methods and periodic verification procedures; ANSI/ASA S1.11 (national adoption of IEC 61260‑1); IEC 61672 series (sound level meters) and IEC 61094 series (measurement microphones); and metrology references such as ISO/IEC Guide 98‑3 (GUM) for uncertainty evaluation.

Keywords

octave‑band filter, fractional‑octave, band‑pass filter, electroacoustics, filter class 1, filter class 2, mid‑band frequency, band‑edge frequency, relative attenuation, measurement uncertainty, spectrum analyser, sound level meter.

FAQ

Q: What is this standard?

A: IEC 61260‑1:2014 is the international specification that defines performance and conformance requirements for octave and fractional‑octave band‑pass filters used in acoustical spectral analysis.

Q: What does it cover?

A: It covers mathematical definitions (mid‑band and band‑edge frequencies), design goals, acceptance limits, measurement uncertainty limits, environmental operating conditions, and conformity criteria for analogue, sampled‑data and digital filter implementations (class 1 and class 2).

Q: Who typically uses it?

A: Instrument manufacturers, calibration and test laboratories, acoustical consultants, metrology institutes, and researchers needing standardized octave/fractional‑octave spectral measurements. National standards bodies and test houses use it when adopting or referencing octave‑filter performance requirements.

Q: Is it current or superseded?

A: IEC 61260‑1:2014 is the current first edition (published 2014) that superseded the earlier IEC 61260 (1995) and its 2001 amendment. Subsequent related parts (61260‑2 and 61260‑3) provide pattern and periodic test methods. Users should verify whether any national adoptions or later amendments apply in their jurisdiction.

Q: Is it part of a series?

A: Yes — IEC 61260 is a multipart series. Part 1 sets specifications; Parts 2 and 3 cover pattern‑evaluation tests and periodic tests respectively, providing the normative test procedures to demonstrate and verify conformance.

Q: What are the key keywords?

A: Octave filter, fractional‑octave, band‑pass, mid‑band frequency, band‑edge frequency, relative attenuation, class 1, class 2, measurement uncertainty.