CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity level of standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
Degrees of equivalence relative to the CCAUV.AK5 key comparison reference values, expressed in dB
Red diamonds: participants in CCAUV.AUV.AK5 (Microphones 4160 S/N 811012)
Blue square: participant in COOMET.AUV.AK5 (Microphone 4160 S/N 2545015)
Green triangles: participants in AFRIMETS.AUV.AK5 (Microphone 4160 S/N 2036126)
Orange circles: participants in EURAMET.AUV.AK5 (Microphone 4160 S/N 2036126)
CCAUV.AK5
MEASURAND : Pressure sensitivity level of standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
Degrees of equivalence relative to the CCAUV.AK5 key comparison reference values, expressed in dB
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity phase of standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
Degrees of equivalence relative to the CCAUV.AK5 key comparison reference values, expressed in degrees
Red diamonds: participants in CCAUV.AUV.AK5 (Microphones 4160 S/N 811012)
Blue square: participant in COOMET.AUV.AK5 (Microphone 4160 S/N 2545015)
Green triangles: participants in AFRIMETS.AUV.AK5 (Microphone 4160 S/N 2036126)
Orange circles: participants in EURAMET.AUV.AK5 (Microphone 4160 S/N 2036126)
CCAUV.AK5
MEASURAND : Pressure sensitivity phase of standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
Degrees of equivalence relative to the CCAUV.AK5 key comparison reference values, expressed in degrees
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity level of standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
Degrees of equivalence relative to the CCAUV.AK5 key comparison reference values, expressed in dB
Frequency: 251.189 Hz
Frequency: 1000 Hz
Dark blue: participants in CCAUV.AUV.AK5 (Microphones 4160 S/N 811012 and S/N 2652754)
Blue: participant in COOMET.AUV.AK5 (Microphone 4160 S/N 2545015)
Green: participants in AFRIMETS.AUV.AK5 (Microphone 4160 S/N 2036126)
Orange: participants in EURAMET.AUV.AK5 (Microphone 4160 S/N 2036126)
Results are presented under A4 printable format in Summary Results (PDF file)
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity phase of standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
Degrees of equivalence relative to the CCAUV.AK5 key comparison reference values, expressed in degrees
Frequency: 251.189 Hz
Frequency: 1000 Hz
Dark blue: participants in CCAUV.AUV.AK5 (Microphones 4160 S/N 811012 and S/N 2652754)
Blue: participant in COOMET.AUV.AK5 (Microphone 4160 S/N 2545015)
Green: participants in AFRIMETS.AUV.AK5 (Microphone 4160 S/N 2036126)
Orange: participants in EURAMET.AUV.AK5 (Microphone 4160 S/N 2036126)
Results are presented under A4 printable format in Summary Results (PDF file)
Metrology area, Subfield  Acoustics, Ultrasound, Vibration, Acoustics 
Description  Comparison of laboratory standard microphone calibrations 
Time of measurements  2013  2015 
Status  Approved for equivalence 
Final Reports of the comparisons  
References  
Measurand  Pressure sensitivity level of laboratory standard microphone type LS1P 
Parameters  Frequency: 2 Hz to 10 kHz 
Transfer device  Laboratory standard LS1P microphones 
Comparison type  Key Comparison 
Consultative Committee  CCAUV (Consultative Committee for Acoustics, Ultrasound and Vibration) 
Conducted by  EURAMET (European Association of National Metrology Institutes) 
Comments  Results published on 7 January 2019 
Pilot institute 
NPL
National Physical Laboratory United Kingdom 
Contact person  J. Avison janine.avison@npl.co.uk +44 (0) 20 8943 6706 
Pilot laboratory  

NPL 
National Physical Laboratory, United Kingdom, EURAMET 
BEV 
Bundesamt für Eich und Vermessungswesen, Austria, EURAMET 
BIM 
Bulgarian Institute of Metrology, Bulgaria, EURAMET 
CEM 
Centro Español de Metrologia, Spain, EURAMET 
DMDM 
Directorate of Measures and Precious Metals, Serbia, EURAMET 
INRIM 
Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET 
LNE 
Laboratoire national de métrologie et d'essais, France, EURAMET 
METAS 
Federal Institute of Metrology, Switzerland, EURAMET 
NIS 
National Institute for Standards, Egypt, AFRIMETS 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
SP 
Technical Research Institute of Sweden from 2017 Research Institutes of Sweden AB, Sweden, EURAMET 
UME 
TÜBITAK Ulusal Metroloji Enstitüsü, Turkey, EURAMET 
This page proposes printout on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity level of two standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARDS : Microphone 4160 811012 IEC type LS1P, and microphone 4160 2652754 IEC type LS1P
For each frequency and each standard, the key comparison reference value, x_{R}, expressed in dB re 1 V/Pa, and associated standard uncertainty, u_{R}, expressed in dB, is computed as described in Section 7 of the CCAUV.AK5 Final Report.

For each frequency and each standard, the degree of equivalence of laboratory i, D_{i }, and expanded uncertainty (k = 2) U_{i}, is determined as explained in Section 8 of the Final Report. 
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only, and the results obtained for other frequency values from 2 Hz to 10 kHz for microphone 811012, and from 2 Hz to 1 kHz for microphone 2652754 can be found in the EXCEL file "CCAUVAK5 Final Report Tables of Data.xls" attached to the Final Report of key comparison CCAUV.AK5.
MEASURAND : Pressure sensitivity level of one standard microphone type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARD : Microphone 4160 2545015 IEC type LS1P
The CCAUV.AK5 key comparison reference values were applied using the GUM as linking laboratory. The linking procedure is described in Section 7 of the COOMET.AUV.AK5 Final Report. 
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only. The results obtained for other frequency values from 2 Hz to 10 kHz are given in the EXCEL file "COOMET.AUVAK5 Final Report Tables of Data.xls".
MEASURAND : Pressure sensitivity level of one standard microphone type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARD : Microphone 4160 2036126 IEC type LS1P
NPL provides the link between both comparisons, and the linkage procedure is described in Section 7 of the AFRIMETS.AUV.AK5 Final Report.
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only. The results obtained for other frequency values from 2 Hz to 10 kHz are given in Table 4 and 5 on page 15 to 20 of the AFRIMETS.AUV.AK5 Final Report and in the EXCEL file "AFRIMETS.AUV.AK5_Final_Report_Results.xlsx".
MEASURAND : Pressure sensitivity level of one standard microphone type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARD : Microphone 4160 2036126 IEC type LS1P
NPL and INRiM provide the link between both comparisons, and the linkage procedure is described in Section 5 of the EURAMET.AUV.AK5 Final Report.
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only. The results obtained for other frequency values from 2 Hz to 10 kHz are given in the EXCEL file "EURAMET.AUVAK5_Tables_of_Data.xls".
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity phase of two standard microphones type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARDS : Microphone 4160 811012 IEC type LS1P, and microphone 4160 2652754 IEC type LS1P
For each frequency and each standard, the key comparison reference value, x_{R}, expressed in degrees re 1 V/Pa, and associated standard uncertainty, u_{R}, expressed in degrees, is computed as described in Section 7 of the CCAUV.AK5 Final Report. 
For each frequency and each standard, the degree of equivalence of laboratory i, D_{i }, and expanded uncertainty (k = 2) U_{i}, is determined as explained in Section 8 of the Final Report. 
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only, and the results obtained for other frequency values from 2 Hz to 10 kHz for microphone 811012, and from 2 Hz to 1 kHz for microphone 2652754 can be found in the EXCEL file "CCAUVAK5 Final Report Tables of Data.xls" attached to the Final Report of key comparison CCAUV.AK5.
MEASURAND : Pressure sensitivity phase of one standard microphone type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARD : Microphone 4160 2545015 IEC type LS1P
The CCAUV.AK5 key comparison reference values were applied using the GUM as linking laboratory. The linking procedure is described in Section 7 of the COOMET.AUV.AK5 Final Report. 
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only. The results obtained for other frequency values from 2 Hz to 10 kHz are given in the EXCEL file "COOMET.AUVAK5 Final Report Tables of Data.xls".
MEASURAND : Pressure sensitivity phase of one standard microphone type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARD : Microphone 4160 2036126 IEC type LS1P
NPL provides the link between both comparisons, and the linkage procedure is described in Section 7 of the AFRIMETS.AUV.AK5 Final Report.
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only. The results obtained for other frequency values from 2 Hz to 10 kHz are given in Table 4 and 5 on page 15 to 20 of the AFRIMETS.AUV.AK5 Final Report and in the EXCEL file "AFRIMETS.AUV.AK5_Final_Report_Results.xlsx".
MEASURAND : Pressure sensitivity phase of one standard microphone type LS1P
FREQUENCIES : 251.189 Hz and 1 kHz
TRANSFER STANDARD : Microphone 4160 2036126 IEC type LS1P
NPL and INRiM provide the link between both comparisons, and the linkage procedure is described in Section 5 of the EURAMET.AUV.AK5 Final Report.
Results for the degrees of equivalence presented here are those for the frequency values of 251.189 Hz and 1 kHz only. The results obtained for other frequency values from 2 Hz to 10 kHz are given in the EXCEL file "EURAMET.AUVAK5_Tables_of_Data.xls".
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity level of two standard microphones type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARDS : Microphone 4160 811012 IEC type LS1P, and microphone 4160 2652754 IEC type LS1P
The individual measurement results and associated standard uncertainties declared by the participating laboratories for both microphones can be found in the EXCEL file "CCAUVAK5 Final Report Tables of Data.xls" attached to the Final Report of key comparison CCAUV.AK5 under the tabs "811012 Level", and "2652754 Level Adjusted".
MEASURAND : Pressure sensitivity level of one standard microphone type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARD : Microphone 4160 2545015 IEC type LS1P
The individual measurement results and associated standard uncertainties declared by the participating laboratories for the travelling microphone are given in the EXCEL file "COOMET.AUVAK5 Final Report Tables of Data.xls".
MEASURAND : Pressure sensitivity level of two standard microphones type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARDS : Microphone 4160 811014 IEC type LS1P, and microphone 4160 2036126 IEC type LS1P
The individual measurement results and associated uncertainties declared by the participating laboratories for the travelling microphones can be found in Annex C of the AFRIMETS.AUV.AK5 Final Report and in the EXCEL file "AFRIMETS.AUV.AK5_Final_Report_Results.xlsx".
The results obtained using the microphone 4160 811014 IEC type LS1P were not linked to CCAUV.AK5 results because of the observed shift in the sensitivity.
MEASURAND : Pressure sensitivity level of two standard microphones type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARDS : Microphone 4160 811014 IEC type LS1P, and microphone 4160 2036126 IEC type LS1P
The individual measurement results and associated uncertainties declared by the participating laboratories for the travelling microphones can be found in Section 4 of the EURAMET.AUV.AK5 Final Report and in the EXCEL file "EURAMET.AUVAK5_Tables_of_Data.xls".
The results obtained using the microphone 4160 811014 IEC type LS1P were not linked to CCAUV.AK5 results because of the observed shift in the sensitivity.
CCAUV.AK5, COOMET.AUV.AK5, AFRIMETS.AUV.AK5 and EURAMET.AUV.AK5
MEASURAND : Pressure sensitivity phase of two standard microphones type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARDS : Microphone 4160 811012 IEC type LS1P, and microphone 4160 2652754 IEC type LS1P
The individual measurement results and associated standard uncertainties declared by the participating laboratories for both microphones can be found in the EXCEL file "CCAUVAK5 Final Report Tables of Data.xls" attached to the Final Report of key comparison CCAUV.AK5 under the tabs "811012 Phase", and "2652754 Phase".
MEASURAND : Pressure sensitivity phase of one standard microphone type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARD : Microphone 4160 2545015 IEC type LS1P
The individual measurement results and associated standard uncertainties declared by the participating laboratories for the travelling microphone are given in the EXCEL file "COOMET.AUVAK5 Final Report Tables of Data.xls".
MEASURAND : Pressure sensitivity phase of two standard microphones type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARDS : Microphone 4160 811014 IEC type LS1P, and microphone 4160 2036126 IEC type LS1P
The individual measurement results and associated uncertainties declared by the participating laboratories for the travelling microphones can be found in Annex C of the AFRIMETS.AUV.AK5 Final Report and in the EXCEL file "AFRIMETS.AUV.AK5_Final_Report_Results.xlsx".
The results obtained using the microphone 4160 811014 IEC type LS1P were not linked to CCAUV.AK5 results because of the observed shift in the sensitivity.
MEASURAND : Pressure sensitivity phase of two standard microphones type LS1P
FREQUENCIES : 2 Hz to 10 kHz
TRANSFER STANDARDS : Microphone 4160 811014 IEC type LS1P, and microphone 4160 2036126 IEC type LS1P
The individual measurement results and associated uncertainties declared by the participating laboratories for the travelling microphones can be found in Section 4 of the EURAMET.AUV.AK5 Final Report and in the EXCEL file "EURAMET.AUVAK5_Tables_of_Data.xls".
The results obtained using the microphone 4160 811014 IEC type LS1P were not linked to CCAUV.AK5 results because of the observed shift in the sensitivity.