BS EN 61260-3:2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Submission for testing
5 Conformance
6 Preliminary inspection
7 Power supply
8 Environmental conditions
9 Mandatory facilities and general requirements
10 Test of relative attenuation at midband frequency
   or effective bandwidth deviation
11 Linear operating range, measurement range, level
   range control and overload indicator
12 Test of lower limit of linear operating range
13 Measurement of relative attenuation
14 Documentation
Annex A (informative) - Uncertainty related to test by
        sinusoidal sweeps
Annex B (informative) - Test of effective bandwidth
        deviation with the use of an exponential sweep -
        Example
Annex C (informative) - Normalized frequencies for test
        of one-third-octave-band filters
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Explains procedures for periodic testing of octave-band and fractional-octave-band filters that were designed to conform to the class 1 or class 2 specifications given in IEC 61260-1:2014.

1.1 This part of IEC61260 describes procedures for periodic testing of octave-band and fractional-octave-band filters that were designed to conform to the class 1 or class 2 specifications given in IEC61260‑1:2014 . The aim of this standard is to ensure that periodic testing is performed in a consistent manner by all laboratories. 1.2 The purpose of periodic testing is to assure the user that the performance of an octave-band and fractional-octave-band filter conforms to the applicable specifications of IEC61260‑1 for a limited set of key tests and for the environmental conditions under which the tests were performed. 1.3 The extent of the tests in this standard is deliberately restricted to the minimum considered necessary for periodic tests. 1.4 Periodic tests described in this standard apply to filters for which the manufacturer claims conformance to the specifications in IEC61260‑1:2014 . Periodic tests in this standard apply to filters for which the model has been, or has not been, pattern approved by an independent testing organization responsible for pattern approvals in accordance with the test procedures of IEC61260‑2 . 1.5 Because of the limited extent of the periodic tests, if evidence of pattern approval is not publicly available, no general conclusion about conformance to the specifications of IEC61260‑1 can be made, even if the results of the periodic tests conform to all applicable requirements of this standard.