CCAUV.A-K3, COOMET.AUV.A-K3, EUROMET.AUV.A-K3,
APMP.AUV.A-K3.1, and APMP.AUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in
dB re 1 V/Pa

Click on the graph below to get a closer view

Red diamonds: participants in CCAUV.A-K3
Green triangles: participants in COOMET.AUV.A-K3
Blue squares: participants in EUROMET.AUV.A-K3
Orange circle: participant in APMP.AUV.A-K3.1
Pink squares: participants in APMP.AUV.A-K3

CCAUV.A-K3, COOMET.AUV.A-K3, EUROMET.AUV.A-K3,
APMP.AUV.A-K3.1, and APMP.AUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz

Degrees of equivalence Di and expanded uncertainty Ui (k = 2)

Black: participants in CCAUV.A-K3
Green: participants in COOMET.AUV.A-K3
Blue: participants in EUROMET.AUV.A-K3
Orange: participant in APMP.AUV.A-K3.1
Pink: participants in APMP.AUV.A-K3

   
Lab iDiUi
 / dB/ dB
CENAM0.0140.052
NMIA0.0040.035
DPLA-0.0040.025
GUM-0.0160.045
INMETRO0.0010.040
KRISS0.0080.026
LNE0.0160.026
NIM-0.0090.045
NIST-0.0010.035
NMIJ-0.0160.082
NPL-0.0060.026
NRC-0.0060.035
PTB0.0040.035
UME0.0070.073
VNIIFTRI-0.0160.035
NPLI0.0150.073
GUM*-0.0100.049
DNDI "Systema"*-0.0400.067
VNIIFTRI*0.0520.039
INM(RO)*0.0180.044

* indicates participants in COOMET.AUV.A-K3
The pair-wise degrees of equivalence obtained inside EUROMET.AUV.A-K3 are available by clicking here.
The pair-wise degrees of equivalence obtained inside APMP.AUV.A-K3 are available in Table 11d, page 41 of the APMP.AUV.A-K3 Final Report.

These results are presented under A4 printable format in Summary Results (PDF file).

APMP.AUV.A-K3.1
Metrology area, Sub-field Acoustics, Ultrasound, Vibration, Acoustics
Description Comparison of laboratory standard microphone calibrations
Time of measurements 2008
Status Approved for equivalence
Final Reports of the comparisons
References

APMP.AUV.A-K1.1 and K3.1 Technical Protocol.pdf

Measurand Sound pressure
Parameters Frequency: 31.5 Hz to 25 kHz
Transfer device One LS2P microphone
Comparison type Key Comparison
Consultative Committee CCAUV (Consultative Committee for Acoustics, Ultrasound and Vibration)
Conducted by APMP (Asia Pacific Metrology Programme)
Comments

Results published on 03 February 2011

COOMET.AUV.A-K3, EUROMET.AUV.A-K3, APMP.AUV.A-K3.1 and APMP.AUV.A-K3 results are linked to those of CCAUV.A-K3

Laboratory standard microphones LS2P

Pilot institute NMIA
National Measurement Institute, Australia
Australia
Contact person Prem NARANG

+61 2 8467 3544
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
NMIA

National Measurement Institute, Australia, Australia, APMP

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

Puslit KIM-LIPI

Research Center for Calibration, Instrumentation and Metrology – Indonesian Institute of Sciences, Indonesia, APMP

CCAUV.A-K3, COOMET.AUV.A-K3, EUROMET.AUV.A-K3,
APMP.AUV.A-K3.1, and APMP.AUV.A-K3

  • Key comparison CCAUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 kHz

For each microphone, the key comparison reference value, xR, and its associated standard uncertainty, uR, are computed as explained in sections 4.2 and 5.1 of the CCAUV.A-K3 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:
Di and Ui, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in sections 4.3 and 5.2 of the CCAUV.A-K3 Final Report, and in the Final Report of the bilateral comparison DPLA-NPLI.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and Uij, 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.A-K3 Final Report, and in the Final Report of the bilateral comparison DPLA-NPLI.

  • Linking COOMET.AUV.A-K3 to CCAUV.A-K3

DPLA provides the link between key comparisons CCAUV.A-K3 and COOMET.AUV.A-K3. The linkage process is described in section 5 of the COOMET.AUV.A-K3 Final Report.

The degree of equivalence of laboratory i participant in COOMET.AUV.A-K3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: Di and Ui, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 5 of the COOMET.AUV.A-K3 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and Uij, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa.
The computation of these two terms is explained in section 5 of the COOMET.AUV.A-K3 Final Report when one or two laboratories participate in COOMET.AUV.A-K3.

  • Linking EUROMET.AUV.A-K3 to CCAUV.A-K3

DPLA provides the link between key comparisons CCAUV.A-K3 and EUROMET.AUV.A-K3. The linkage process is described in section 6 of the EUROMET.AUV.A-K3 Final Report.

The degree of equivalence of laboratory i participant in EUROMET.AUV.A-K3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: Di and Ui, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the EUROMET.AUV.A-K3 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and Uij, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa.
The computation of these two terms is explained in section 7 of the EUROMET.AUV.A-K3 Final Report when both of the laboratories are participants in EUROMET.AUV.A-K3.

The matrix of equivalence computed from CCAUV.A-K3 and COOMET.AUV.A-K3 is expanded with pair-wise degrees of equivalence obtained inside EUROMET.AUV.A-K3.

  • Linking APMP.AUV.A-K3.1 to CCAUV.A-K3

KRISS provides the link between key comparisons CCAUV.A-K3 and APMP.AUV.A-K3.1. The linkage process is described in section 8 of the APMP.AUV.A-K3.1 Final Report.

The degree of equivalence of KIM-LIPI participant in APMP.AUV.A-K3.1 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: Di and Ui, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 8 of the APMP.AUV.A-K3.1 Final Report.

No pair-wise degrees of equivalence between KIM-LIPI and other participants in CCAUV.A-K3 have been computed.

  • Linking APMP.AUV.A-K3 to CCAUV.A-K3

NMIJ, KRISS, NIM, and NMIA provide the link between key comparisons CCAUV.A-K3 and APMP.AUV.A-K3. The linkage process is described in section 6 of the APMP.AUV.A-K3 Final Report.

The degree of equivalence of laboratory i participant in APMP.AUV.A-K3 with respect to the key comparison reference value is given by a pair of terms expressed in dB re 1 V/Pa: Di and Ui, its expanded uncertainty (k = 2). The degrees of equivalence are computed as explained in section 6 of the APMP.AUV.A-K3 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and Uij, its expanded uncertainty (k = 2), both expressed in dB re 1 V/Pa.
The computation of these two terms is explained in section 7 of the APMP.AUV.A-K3 Final Report when both of the laboratories are participants in APMP.AUV.A-K3, and the numerical values can be found from Table 11a to 11p in the APMP.AUV.A-K3 Final Report.

This makes it possible to extend the graphs of equivalence of the participants in CCAUV.A-K3 with the participants in APMP.AUV.A-K3 for frequency 250 Hz.

CCAUV.A-K3, COOMET.AUV.A-K3, EUROMET.AUV.A-K3,
APMP.AUV.A-K3.1, and APMP.AUV.A-K3

  • Key comparison CCAUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz

xi : 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.

ui : combined standard uncertainty of xi

Microphone: 1395456

 Lab i xi
/ dB
2ui
/ 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 xi
/ dB
2ui
/ 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 xi
/ dB
2ui
/ 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 xi
/ dB
2ui
/ 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 DPLA-NPLI, conducted as an extension of key comparison CCAUV.A-K3

  • Key comparison COOMET.AUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz

xi-COO : result of measurements carried out by laboratory i participant in the key comparison COOMET.AUV.A-K3; unit is dB re 1 V/Pa

ui-COO : combined standard uncertainty of xi-COO

A sudden change in sensitivity of microphone 1503926 occured during the comparison.

Microphone: 1503926 (before change in sensitivity)

 Lab i

xi-COO
/ dB
2ui-COO
/ 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

xi-COO
/ dB
2ui-COO
/ dB
 DPLA -38.851 0.03
 VNIIFTRI -38.812 0.04
 INM(RO) -38.843 0.046

Microphone: 1503933

 Lab i xi-COO
/ dB
2ui -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 xi-COO
/ dB
2ui-COO
/ dB
 DPLA -38.855 0.03
 VNIIFTRI -38.807 0.04
 INM(RO) -38.820 0.046

  • Key comparison EUROMET.AUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz

xi-EUR : result of measurements carried out by laboratory i participant in the key comparison EUROMET.AUV.A-K3; unit is dB re 1 V/Pa

ui-EUR : combined standard uncertainty of xi-EUR

Microphone: 1395456

 Lab i xi-EUR
/ dB
2ui-EUR
/ 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 xi-EUR
/ dB
2ui-EUR
/ 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

Lab i

Date of measurement

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

CMI, METAS, and CEM data were corrected for frequency realignment to nominal frequencies.
SP and MIKES data were corrected for microphone 1395456 sensitivity drift.
  • Key comparison APMP.AUV.A-K3.1

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P
FREQUENCY : 250 Hz

xi-APMP(K3.1) : result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.A-K3.1; unit is dB re 1 V/Pa

Ui-APMP(K3.1) : expanded uncertainty (k = 2) of xi-APMP(K3.1)

Microphone: 2341431

 Lab i

xi-APMP(K3.1)
/ dB

Ui-APMP(K3.1)
/ dB

 KRISS -38.74 0.04
 KIM-LIPI -38.75 0.06

  • Key comparison APMP.AUV.A-K3

MEASURAND : Pressure sensitivity level of laboratory standard microphone type LS2P

FREQUENCY : 250 Hz

xi-APMP(K3) : result of measurements carried out by laboratory i participant in the key comparison APMP.AUV.A-K3; unit is dB re 1 V/Pa
Ui-APMP(K3) : expanded uncertainty (k = 2) of xi-APMP(K3)

Microphone: 1763688

The measurement results reported by the participants can be found in Table 2a and 3 of the APMP.AUV.A-K3 Final Report.

Microphone: 2341431

The measurement results reported by the participants can be found in Table 2b and 3 of the APMP.AUV.A-K3 Final Report.

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