CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in
dB re 1 V/Pa
Click on the graph below to get a closer view
Red diamonds: participants in CCAUV.AK3
Green triangles: participants in COOMET.AUV.AK3
Blue squares: participants in EUROMET.AUV.AK3
Orange circle: participant in APMP.AUV.AK3.1
Pink squares: participants in APMP.AUV.AK3
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in
dB re 1 V/Pa
Click on the graph below to get a closer view
Red diamonds: participants in CCAUV.AK3
Green triangles: participants in COOMET.AUV.AK3
Blue squares: participants in EUROMET.AUV.AK3
Orange circle: participant in APMP.AUV.AK3.1
Pink squares: participants in APMP.AUV.AK3
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 31.5 kHz
Graphs of equivalence are provided for frequencies 250 Hz and 1000 Hz only
Red diamonds: participants in CCAUV.AK3
Green triangles: participants in COOMET.AUV.AK3
Blue squares: participants in EUROMET.AUV.AK3
Orange circle: participant in APMP.AUV.AK3.1
Pink squares: participants in APMP.AUV.AK3
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2)
Black: participants in CCAUV.AK3
Green: participants in COOMET.AUV.AK3
Blue: participants in EUROMET.AUV.AK3
Orange: participant in APMP.AUV.AK3.1
Pink: participants in APMP.AUV.AK3
Lab i  D_{i}  U_{i} 
/ dB  / dB  
CENAM  0.014  0.052 
NMIA  0.004  0.035 
DPLA  0.004  0.025 
GUM  0.016  0.045 
INMETRO  0.001  0.040 
KRISS  0.008  0.026 
LNE  0.016  0.026 
NIM  0.009  0.045 
NIST  0.001  0.035 
NMIJ  0.016  0.082 
NPL  0.006  0.026 
NRC  0.006  0.035 
PTB  0.004  0.035 
UME  0.007  0.073 
VNIIFTRI  0.016  0.035 
NPLI  0.015  0.073 
GUM*  0.010  0.049 
DNDI "Systema"*  0.040  0.067 
VNIIFTRI*  0.052  0.039 
INM(RO)*  0.018  0.044 
* indicates participants in COOMET.AUV.AK3
The pairwise degrees of equivalence obtained inside EUROMET.AUV.AK3 are available by clicking here.
The pairwise degrees of equivalence obtained inside APMP.AUV.AK3 are available in Table 11d, page 41 of the APMP.AUV.AK3 Final Report.
These results are presented under A4 printable format in Summary Results (PDF file).
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2)
Black: participants in CCAUV.AK3
Green: participants in COOMET.AUV.AK3
Blue: participants in EUROMET.AUV.AK3
Orange: participant in APMP.AUV.AK3.1
Pink: participants in APMP.AUV.AK3
Lab i  D_{i}  U_{i} 
/ dB  / dB  
CENAM  0.013  0.052 
NMIA  0.002  0.035 
DPLA  0.004  0.025 
GUM  0.017  0.045 
INMETRO  0.000  0.040 
KRISS  0.008  0.026 
LNE  0.013  0.027 
NIM  0.010  0.045 
NIST  0.004  0.035 
NMIJ  0.027  0.082 
NPL  0.003  0.026 
NRC  0.008  0.035 
PTB  0.003  0.035 
UME  0.006  0.073 
VNIIFTRI  0.013  0.035 
NPLI  0.005  0.073 
GUM*  0.004  0.049 
DNDI "Systema"*  0.034  0.058 
VNIIFTRI*  0.050  0.039 
INM(RO)*  0.018  0.044 
* indicates participants in COOMET.AUV.AK3
The pairwise degrees of equivalence obtained inside EUROMET.AUV.AK3 are available by clicking here.
The pairwise degrees of equivalence obtained inside APMP.AUV.AK3 are available in Table 11f, page 45 of the APMP.AUV.AK3 Final Report.
These results are presented under A4 printable format in Summary Results (PDF file).
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3, and APMP.AUV.AK3.1
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 31.5 kHz
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in
dB re 1 V/Pa
In green : participants in COOMET.AUV.AK3
In blue : participants in EUROMET.AUV.AK3
In orange : participant in APMP.AUV.AK3.1
Results are presented under A4 printable format in Summary Results (PDF file).
Graphs of equivalence for 250 Hz and 1000 Hz are also extended with APMP.AUV.AK3 results.
Pairwise degrees of equivalence are computed for frequencies 250 Hz and 1000 Hz only, for participants in CCAUV.AK3, EUROMET.AUV.AK3 and COOMET.AUV.AK3.
Metrology area, Subfield  Acoustics, Ultrasound, Vibration, Acoustics 
Description  Comparison of laboratory standard microphone calibrations 
Time of measurements  2003 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Sound pressure 
Parameters  Frequency: 31.5 Hz to 31.5 kHz 
Transfer device  Four LS2P microphones 
Comparison type  Key Comparison 
Consultative Committee  CCAUV (Consultative Committee for Acoustics, Ultrasound and Vibration) 
Conducted by  CCAUV (Consultative Committee for Acoustics, Ultrasound and Vibration) 
Comments  PTB acting as COOMET member CCAUV.AK3 results published on 09 June 2006, and completed with the bilateral extension DPLANPLI on 07 September 2007 COOMET.AUV.AK3, EUROMET.AUV.AK3, APMP.AUV.AK3.1 and APMP.AUV.AK3 results are linked to those of CCAUV.AK3 Laboratory standard microphones LS2P

Pilot institute 
CENAM
Centro Nacional de Metrologia Mexico 
Contact person  S. EcheverriaGomez +52 442 11 0550 
Additional 
Pilot laboratory  

CENAM 
Centro Nacional de Metrologia, Mexico, SIM 
DPLA 
Danish Primary Laboratory of Acoustics, Denmark, EURAMET 
GUM 
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET 
INMETRO 
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM 
KRISS 
Korea Research Institute of Standards and Science, Korea, Republic of, APMP 
LNE 
Laboratoire national de métrologie et d'essais, France, EURAMET 
NIM 
National Institute of Metrology, China, APMP 
NIST 
National Institute of Standards and Technology, United States, SIM 
NMIA 
National Measurement Institute, Australia, Australia, APMP 
NMIJ AIST 
National Metrology Institute of Japan, Japan, APMP 
NPL 
National Physical Laboratory, United Kingdom, EURAMET 
NPLI 
CSIR National Physical Laboratory of India, India, APMP 
NRC 
National Research Council, Canada, SIM 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
UME 
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET 
VNIIFTRI 
Institute of Physical Technical and Radiotechnical Measurements, Rosstandart, Russian Federation, COOMET 
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.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 kHz
For each microphone, the key comparison reference value, x_{R}, and its associated standard uncertainty, u_{R}, are computed as explained in sections 4.2 and 5.1 of the CCAUV.AK3 Final Report (unit is dB re 1 V/Pa). 
The degree of equivalence of laboratory i with respect to the reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in sections 4.3 and 5.2 of the CCAUV.AK3 Final Report, and in the Final Report of the bilateral comparison DPLANPLI. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. The computation of these two terms is explained in section 5.3 of the CCAUV.AK3 Final Report, and in the Final Report of the bilateral comparison DPLANPLI. 
DPLA provides the link between key comparisons CCAUV.AK3 and COOMET.AUV.AK3. The linkage process is described in section 5 of the COOMET.AUV.AK3 Final Report.
The degree of equivalence of laboratory i participant in COOMET.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 5 of the COOMET.AUV.AK3 Final Report. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
DPLA provides the link between key comparisons CCAUV.AK3 and EUROMET.AUV.AK3. The linkage process is described in section 6 of the EUROMET.AUV.AK3 Final Report.
The degree of equivalence of laboratory i participant in EUROMET.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the EUROMET.AUV.AK3 Final Report. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
KRISS provides the link between key comparisons CCAUV.AK3 and APMP.AUV.AK3.1. The linkage process is described in section 8 of the APMP.AUV.AK3.1 Final Report.
The degree of equivalence of KIMLIPI participant in APMP.AUV.AK3.1 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 8 of the APMP.AUV.AK3.1 Final Report. 
No pairwise degrees of equivalence between KIMLIPI and other participants in CCAUV.AK3 have been computed. 
NMIJ, KRISS, NIM, and NMIA provide the link between key comparisons CCAUV.AK3 and APMP.AUV.AK3. The linkage process is described in section 6 of the APMP.AUV.AK3 Final Report.
The degree of equivalence of laboratory i participant in APMP.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the APMP.AUV.AK3 Final Report. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
For each microphone, the key comparison reference value, x_{R}, and its associated standard uncertainty, u_{R}, are computed as explained in sections 4.2 and 5.1 of the CCAUV.AK3 Final Report (unit is dB re 1 V/Pa). 
The degree of equivalence of laboratory i with respect to the reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in sections 4.3 and 5.2 of the CCAUV.AK3 Final Report, and in the Final Report of the bilateral comparison DPLANPLI. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. The computation of these two terms is explained in section 5.3 of the CCAUV.AK3 Final Report, and in the Final Report of the bilateral comparison DPLANPLI. 
DPLA provides the link between key comparisons CCAUV.AK3 and COOMET.AUV.AK3. The linkage process is described in section 5 of the COOMET.AUV.AK3 Final Report.
The degree of equivalence of laboratory i participant in COOMET.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 5 of the COOMET.AUV.AK3 Final Report. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
DPLA provides the link between key comparisons CCAUV.AK3 and EUROMET.AUV.AK3. The linkage process is described in section 6 of the EUROMET.AUV.AK3 Final Report.
The degree of equivalence of laboratory i participant in EUROMET.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the EUROMET.AUV.AK3 Final Report. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
KRISS provides the link between key comparisons CCAUV.AK3 and APMP.AUV.AK3.1. The linkage process is described in section 8 of the APMP.AUV.AK3.1 Final Report.
The degree of equivalence of KIMLIPI participant in APMP.AUV.AK3.1 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 8 of the APMP.AUV.AK3.1 Final Report. 
No pairwise degrees of equivalence between KIMLIPI and other participants in CCAUV.AK3 have been computed. 
NMIJ, KRISS, NIM, and NMIA provide the link between key comparisons CCAUV.AK3 and APMP.AUV.AK3. The linkage process is described in section 6 of the APMP.AUV.AK3 Final Report.
The degree of equivalence of laboratory i participant in APMP.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the APMP.AUV.AK3 Final Report. 
The degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3, and APMP.AUV.AK3.1
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 31.5 kHz
For each microphone and for each frequency, the key comparison reference value, x_{R}, and its associated standard uncertainty, u_{R}, are computed as explained in sections 4.2 and 5.1 of the CCAUV.AK3 Final Report (unit is dB re 1 V/Pa). 
At a given frequency, the degree of equivalence of laboratory i with respect to the reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in sections 4.3 and 5.2 of the CCAUV.AK3 Final Report, and in the Final Report of the bilateral comparison DPLANPLI. Graphs of equivalence are given for frequencies 250 Hz and 1000 Hz only. 
At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. The computation of these two terms is explained in section 5.3 of the CCAUV.AK3 Final Report, and in the Final Report of the bilateral comparison DPLANPLI. 
DPLA provides the link between key comparisons CCAUV.AK3 and COOMET.AUV.AK3. The linkage process is described in section 5 of the COOMET.AUV.AK3 Final Report.
At a given frequency, the degree of equivalence of laboratory i participant in COOMET.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 5 of the COOMET.AUV.AK3 Final Report. Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz only. 
At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
DPLA provides the link between key comparisons CCAUV.AK3 and EUROMET.AUV.AK3. The linkage process is described in section 6 of the EUROMET.AUV.AK3 Final Report.
At a given frequency, the degree of equivalence of laboratory i participant in EUROMET.AUV.AK3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the EUROMET.AUV.AK3 Final Report. Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz only. 
At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms: D_{ij} and U_{ij}, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa. 
FREQUENCY : 31.5 Hz to 25 kHz
KRISS provides the link between key comparisons CCAUV.AK3 and APMP.AUV.AK3.1. The linkage process is described in section 8 of the APMP.AUV.AK3.1 Final Report.
At a given frequency the degree of equivalence of KIMLIPI participant in APMP.AUV.AK3.1 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: D_{i} and U_{i}, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 8 of the APMP.AUV.AK3.1 Final Report Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz only. 
No pairwise degrees of equivalence between KIMLIPI and other participants in CCAUV.AK3 have been computed. 
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
x_{i} : result of measurements carried out by laboratory i (unit is dB re 1 V/Pa)
Results from LNE, NIM and INMETRO have been corrected for nominal frequencies as described in section 3.2 of the Final Report.
u_{i} : combined standard uncertainty of x_{i}
Microphone: 1395456
Lab i
x_{i}
/ dB2u_{i }/ dB
CENAM
38.43
0.06
DPLA
38.459
0.03
GUM
38.46
0.05
KRISS
38.441
0.03
LNE
38.436
0.030
NIST
38.454
0.04
NMIJ
38.47
0.09
NPL
38.46
0.03
PTB
38.45
0.04
Microphone: 1627783
Lab i
x_{i}
/ dB2u_{i }/ dB
CENAM
38.76
0.06
DPLA
38.771
0.03
GUM
38.79
0.05
KRISS
38.760
0.03
LNE
38.750
0.030
NIST
38.765
0.04
NMIJ
38.78
0.09
NPL
38.77
0.03
PTB
38.76
0.04
Microphone: 1124046
Lab i  x_{i} / dB 
2u_{i }/ dB 
CENAM  38.076  0.06 
NMIA  38.10  0.04 
DPLA  38.103  0.03 
INMETRO  38.103  0.045 
NIM  38.112  0.05 
NRC  38.109  0.04 
UME  38.098  0.08 
VNIIFTRI  38.12  0.04 
DPLA* 
38.114 
0.03 
NPLI* 
38.100 
0.10 
Microphone: 1395455
Lab i  x_{i} / dB 
2u_{i }/ dB 
CENAM  38.404  0.06 
NMIA  38.40  0.04 
DPLA  38.409  0.03 
INMETRO  38.404  0.045 
NIM  38.414  0.05 
NRC  38.411  0.04 
UME  38.397  0.08 
VNIIFTRI  38.42  0.04 
DPLA* 
38.403 
0.03
NPLI*38.380
0.10
*participants in the bilateral comparison DPLANPLI, conducted as an extension of key comparison CCAUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
x_{iCOO} : result of measurements carried out by laboratory i participant in the key comparison COOMET.AUV.AK3; unit is dB re 1 V/Pa
u_{iCOO} : combined standard uncertainty of x_{iCOO}
A sudden change in sensitivity of microphone 1503926 occured during the comparison.
Microphone: 1503926 (before change in sensitivity)
Lab i
x_{iCOO}
/ dB2u_{iCOO }/ dB
DPLA
38.918
0.03
GUM
38.920
0.05
DNDI "Systema"
38.950
0.07
Microphone: 1503926 (after change in sensitivity)
Lab i
x_{iCOO}
/ dB2u_{iCOO }/ dB
DPLA
38.851
0.03
VNIIFTRI
38.812
0.04
INM(RO)
38.843
0.046
Microphone: 1503933
Lab i
x_{iCOO}
/ dB2u_{i COO}/ dB
DPLA
38.960
0.03
GUM
38.97
0.05
DNDI "Systema"
39.00
0.07
VNIIFTRI
38.882
0.04
INM(RO)
38.938
0.046
Microphone: 1526170
Lab i
x_{iCOO}
/ dB2u_{iCOO }/ dB
DPLA
38.855
0.03
VNIIFTRI
38.807
0.04
INM(RO)
38.820
0.046
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
x_{iEUR} : result of measurements carried out by laboratory i participant in the key comparison EUROMET.AUV.AK3; unit is dB re 1 V/Pa
u_{iEUR} : combined standard uncertainty of x_{iEUR}
Microphone: 1395456
Lab i
x_{iEUR}
/ dB2u_{iEUR }/ dB
DPLA
38.450
0.03
INRIM
38.430
0.05
BEV
38.434
0.02
CMI
38.480
0.06
METAS
38.430
0.036
CEM
38.449
0.04
MIKES
38.431
0.0259
SP
38.429
0.05
Microphone: 1627783
Lab i
x_{iEUR}
/ dB2u_{iEUR }/ dB
DPLA
38.767
0.03
INRIM
38.740
0.05
BEV
38.763
0.02
CMI
38.810
0.06
METAS
38.743
0.036
CEM
38.782
0.04
MIKES
38.760
0.0258
SP
38.744
0.05
Date of measurement
Lab i
DPLA
15 Oct 03
INRIM
05 Nov 03
BEV
20 Nov 03
CMI
03 Dec 03
METAS
15 Jan 04
CEM
01 Mar 04
MIKES
29 Mar 04
SP
28 Apr 04
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
x_{iAPMP(K3.1)} : result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.AK3.1; unit is dB re 1 V/Pa
U_{i}_{APMP(K3.1)} : expanded uncertainty (k = 2) of x_{iAPMP(K3.1)}
Microphone: 2341431
Lab i U_{i}_{APMP(K3.1)}/ dB
x_{i}_{APMP(K3.1) }/ dB
KRISS
38.74
0.04
KIMLIPI
38.75
0.06
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz
x_{i}_{APMP(K3) }: result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.AK3; unit is dB re 1 V/Pa
U_{i}_{APMP(K3)} : expanded uncertainty (k = 2) of x_{i}_{APMP(K3)}
Microphone: 1763688
The measurement results reported by the participants can be found in Table 2a and 3 of the APMP.AUV.AK3 Final Report.
Microphone: 2341431
The measurement results reported by the participants can be found in Table 2b and 3 of the APMP.AUV.AK3 Final Report.
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3,
APMP.AUV.AK3.1, and APMP.AUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
x_{i} : result of measurements carried out by laboratory i (unit is dB re 1 V/Pa)
Results from LNE, NIM and INMETRO have been corrected for nominal frequencies as described in section 3.2 of the Final Report.
u_{i} : combined standard uncertainty of x_{i}
Microphone: 1395456
Lab i
x_{i}
/ dB2u_{i }/ dB
CENAM
38.46
0.06
DPLA
38.489
0.03
GUM
38.49
0.05
KRISS
38.471
0.03
LNE
38.468
0.031
NIST
38.488
0.04
NMIJ
38.51
0.09
NPL
38.48
0.03
PTB
38.48
0.04
Microphone: 1627783
Lab i
x_{i}
/ dB2u_{i }/ dB
CENAM
38.77
0.06
DPLA
38.780
0.03
GUM
38.80
0.05
KRISS
38.769
0.03
LNE
38.762
0.031
NIST
38.777
0.04
NMIJ
38.80
0.09
NPL
38.77
0.03
PTB
38.77
0.04
Microphone: 1124046
Lab i  x_{i} / dB 
2u_{i }/ dB 
CENAM  38.082  0.06 
NMIA  38.11  0.04 
DPLA  38.107  0.03 
INMETRO  38.108  0.045 
NIM  38.118  0.05 
NRC  38.116  0.04 
UME  38.104  0.08 
VNIIFTRI  38.12  0.04 
DPLA* 
38.116
0.03
NPLI*38.110
0.10
Microphone: 1395455
Lab i  x_{i} / dB 
2u_{i }/ dB 
CENAM  38.415  0.06 
NMIA  38.41  0.04 
DPLA  38.419  0.03 
INMETRO  38.415  0.045 
NIM  38.426  0.05 
NRC  38.423  0.04 
UME  38.408  0.08 
VNIIFTRI  38.43  0.04 
DPLA* 
38.412 
0.03 
NPLI* 
38.400 
0.10 
*participants in the bilateral comparison DPLANPLI, conducted as an extension of key comparison CCAUV.AK3
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
x_{iCOO} : result of measurements carried out by laboratory i participant in the key comparison COOMET.AUV.AK3; unit is dB re 1 V/Pa
u_{iCOO} : combined standard uncertainty of x_{iCOO}
A sudden change in sensitivity of microphone 1503926 occured during the comparison.
Microphone: 1503926 (before change in sensitivity)
Lab i
x_{iCOO}
/ dB2u_{iCOO }/ dB
DPLA
38.925
0.03
GUM
38.920
0.05
DNDI "Systema"
38.950
0.06
Microphone: 1503926 (after change in sensitivity)
Lab i
x_{iCOO}
/ dB2u_{iCOO }/ dB
DPLA
38.860
0.03
VNIIFTRI
38.823
0.04
INM(RO)
38.851
0.046
Microphone: 1503933
Lab i
x_{iCOO}
/ dB2u_{iCOO}/ dB
DPLA
38.964
0.03
GUM
38.97
0.05
DNDI "Systema"
39.00
0.06
VNIIFTRI
38.887
0.04
INM(RO)
38.941
0.046
Microphone: 1526170
Lab i
x_{iCOO}
/ dB2u_{iCOO }/ dB
DPLA
38.865
0.03
VNIIFTRI
38.819
0.04
INM(RO)
38.832
0.046
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
x_{iEUR} : result of measurements carried out by laboratory i participant in the key comparison EUROMET.AUV.AK3; unit is dB re 1 V/Pa
u_{iEUR} : combined standard uncertainty of x_{iEUR}
Microphone: 1395456
Lab i
x_{iEUR}
/ dB2u_{iEUR }/ dB
DPLA
38.482
0.03
INRIM
38.470
0.05
BEV
38.466
0.02
CMI
38.510
0.06
METAS
38.468
0.036
CEM
38.482
0.04
MIKES
38.463
0.03
SP
38.459
0.05
Microphone: 1627783
Lab i
x_{iEUR}
/ dB2u_{iEUR }/ dB
DPLA
38.775
0.03
INRIM
38.760
0.05
BEV
38.772
0.02
CMI
38.810
0.06
METAS
38.759
0.036
CEM
38.792
0.04
MIKES
38.769
0.03
SP
38.751
0.05
Date of measurement
Lab i
DPLA
15 Oct 03
INRIM
05 Nov 03
BEV
20 Nov 03
CMI
03 Dec 03
METAS
15 Jan 04
CEM
01 Mar 04
MIKES
29 Mar 04
SP
28 Apr 04
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
x_{iAPMP(K3.1)} : result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.AK3.1; unit is dB re 1 V/Pa
U_{i}_{APMP(K3.1)} : expanded uncertainty (k = 2) of x_{iAPMP(K3.1)}
Microphone: 2341431
Lab i U_{i}_{APMP(K3.1)}/ dB
x_{i}_{APMP(K3.1) }/ dB
KRISS
38.73
0.04
KIMLIPI
38.75
0.06
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 1000 Hz
x_{i}_{APMP(K3) }: result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.AK3; unit is dB re 1 V/Pa
U_{i}_{APMP(K3)} : expanded uncertainty (k = 2) of x_{i}_{APMP(K3)}
Microphone: 1763688
The measurement results reported by the participants can be found in Table 2a and 3 of the APMP.AUV.AK3 Final Report.
Microphone: 2341431
The measurement results reported by the participants can be found in Table 2b and 3 of the APMP.AUV.AK3 Final Report.
CCAUV.AK3, COOMET.AUV.AK3, EUROMET.AUV.AK3, and APMP.AUV.AK3.1
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 31.5 kHz
x_{i} : result of measurements carried out by laboratory i (unit is dB re 1 V/Pa)
Results from LNE, NIM and INMETRO have been corrected for nominal frequencies as described in section 3.2 of the CCAUV.AK3 Final Report.
u_{i} : combined standard uncertainty of x_{i}
Click on the following links to access data obtained for the four transfer microphones from 31.5 Hz to 31.5 kHz:
Microphone 1395456
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
Microphone 1627783
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
Microphone 1124046
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
Microphone 1395455
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 31.5 kHz
x_{iCOO} : result of measurements carried out by laboratory i participant in the key comparison COOMET.AUV.AK3; unit is dB re 1 V/Pa
u_{iCOO} : combined standard uncertainty of x_{iCOO}
Click on the following links to access data obtained for the three transfer microphones from 31.5 Hz to 31.5 kHz:
(a sudden change in sensitivity of microphone 1503926 occured during the comparison)
Microphone 1503926 (before and after change in sensitivity)
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
Microphone 1503933
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
Microphone 1526170
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 31.5 kHz
x_{iEUR} : result of measurements carried out by laboratory i participant in the key comparison EUROMET.AUV.AK3; unit is dB re 1 V/Pa
u_{iEUR} : combined standard uncertainty of x_{iEUR}
CMI, METAS, and CEM data were corrected for frequency realignment to nominal frequencies.
SP and MIKES data were corrected for microphone 1395456 sensitivity drift.
Click on the following links to access data obtained for the two transfer microphones from 31.5 Hz to 31.5 kHz:
Microphone 1395456
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
Microphone 1627783
Results from 31.5 Hz to 4000 Hz and results from 6300 Hz to 31500 Hz
MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 31.5 Hz to 25 kHz
x_{iAPMP(K3.1)} : result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.AK3.1; unit is dB re 1 V/Pa
u_{iAPMP(K3.1)} : combined standard uncertainty of x_{iAPMP(K3.1)}
Click on the following link to access data obtained for the transfer microphone from 31.5 Hz to 25 kHz:
Microphone 2341431
Results from 31.5Hz to 25000 Hz