An intercomparison of sound pressure standards

Final Report, 7 February 2005

Final report (NPL Report DQL-AC005) has been completed and circulated to participants. Further copies are available on request from

Richard Barham
National Physical Laboratory
Acoustical Metrology Group
Teddington, UK
TW11 0LW

Data transmitted to CIPM for inclusion in the key comparison database

Project Description

The project will compare primary calibrations of LS1P and LS2P microphones according to IEC 1094-2.

There is considerable interest in participating in such an intercomparison. To ease the burden on the coordinating laboratories and ensure that the work is completed in a reasonable time, the measurements will be conducted in four circuits as described on the attached sheet.

Potential participants are invited to contact the proposer with details of:

which microphones they would calibrate (LS1, LS2 or both),
the frequency range they would use, and
any periods when they would not be able to calibrate the microphones,

so that a project plan can be prepared before 31/3/97.

It is expected that the project could be agreed at the next Acoustics Euromet meeting in May 97.

The first exchange of microphones could also take place then.

Further Information

NPL proposes to act as co-ordinator.

Acoustics, Ultrasound and Vibration (AUV)
Richard Bahram, NPL (United Kingdom)
Coordinating Institute
NPL (United Kingdom)
Further Partners