CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 250 Hz

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in dB
The horizontal continuous line crosses the y-axis at the value 0 dB

Click on the graph for a closer view

Red diamonds : CCAUV.A-K1 participants
Green triangles : EUROMET.AUV.A-K1 participants only
Blue squares : APMP.AUV.A-K1 participants only
Black circles : SIM.AUV.A-K1 participants only
Orange square : APMP.AUV.A-K1.1 participant only
Pink circles : COOMET.AUV.A-K1 participants only
Grey triangle : COOMET.AUV.A-K1.1 participant only

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 1000 Hz

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in dB
The horizontal continuous line crosses the y-axis at the value 0 dB

Click on the graph for a closer view

Red diamonds : CCAUV.A-K1 participants
Green triangles : EUROMET.AUV.A-K1 participants only
Blue squares : APMP.AUV.A-K1 participants only
Black circles : SIM.AUV.A-K1 participants only
Orange square : APMP.AUV.A-K1.1 participant only
Pink circles : COOMET.AUV.A-K1 participants only
Grey triangle : COOMET.AUV.A-K1.1 participant only

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 63 Hz to 8 kHz

Graphs of equivalence are only provided for frequencies 250 Hz and 1000 Hz.

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in dB
The horizontal continuous lines cross the y-axis at the value 0 dB

Click on the graph for a closer view

  • Frequency 250 Hz

  • Frequency 1000 Hz

Red diamonds : CCAUV.A-K1 participants
Green triangles : EUROMET.AUV.A-K1 participants only
Blue squares : APMP.AUV.A-K1 participants only
Black circles : SIM.AUV.A-K1 participants only
Orange square : APMP.AUV.A-K1.1 participant only
Pink circles : COOMET.AUV.A-K1 participants only
Grey triangle : COOMET.AUV.A-K1.1 participant only

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 250 Hz

Degrees of equivalence relative to the CCAUV.A-K1 key comparison reference value, expressed in dB

In dark blue : CCAUV.A-K1 participants
In green : EUROMET.AUV.A-K1 participants only
In blue : APMP.AUV.A-K1 participants only
In black : SIM.AUV.A-K1 participants only
In orange : APMP.AUV.A-K1.1 participant only
In pink : COOMET.AUV.A-K1 participants only
In grey : COOMET.AUV.A-K1.1 participant only

The pair-wise degrees of equivalence are given in the yellow part of the matrix presented below. All values are expressed in dB.

   
NPL0.010.03
CENAM0.000.04
CSIR-NML0.020.05
NMIA0.020.04
DPLA0.000.03
NMIJ-0.010.04
GUM0.010.03
KRISS0.000.03
NIST-0.010.04
NRC-0.040.03
PTB0.010.03
VNIIFTRI0.000.05
BEV*-0.010.03
SP*0.010.04
IEN*-0.010.05
UME*0.020.05
METAS*-0.010.03
SMU*0.000.04
OMH*0.030.07
CMI*-0.040.03
NMIA**0.000.04
CMS/ITRI**0.010.04
NIM**-0.010.05
NIMT**0.000.04
NML-SIRIM**0.000.03
NPLI**-0.020.07
SCL**-0.010.04
INMETRO***-0.040.05
INTI***-0.020.05
KIM-LIPI****-0.010.08
UME^0.020.06
SMU^0.010.05
DNDI^^0.020.06

* EUROMET.AUV.A-K1 participants only
** APMP.AUV.A-K1 participants only
*** SIM.AUV.A-K1 participants only
**** APMP.AUV.A-K1.1 participant only
^ COOMET.AUV.A-K1 participants only
^^ COOMET.AUV.A-K1.1 participant only

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

Data obtained at 250 Hz is characteristic of frequencies up to 2 kHz.

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 1000 Hz

Degrees of equivalence relative to the CCAUV.A-K1 key comparison reference values, expressed in dB

In dark blue : CCAUV.A-K1 participants
In green : EUROMET.AUV.A-K1 participants only
In blue : APMP.AUV.A-K1 participants only
In black : SIM.AUV.A-K1 participants only
In orange : APMP.AUV.A-K1.1 participant only
In pink : COOMET.AUV.A-K1 participants only
In grey : COOMET.AUV.A-K1.1 participants only

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

The pair-wise degrees of equivalence are computed only for frequency 250 Hz. This data is characteristic of frequencies up to 2 kHz.

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 63 Hz to 8 kHz

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

In dark blue : CCAUV.A-K1 participants
In green : EUROMET.AUV.A-K1 participants only
In blue : APMP.AUV.A-K1 participants only
In black : SIM.AUV.A-K1 participants only
In orange : APMP.AUV.A-K1.1 participant only
In pink : COOMET.AUV.A-K1 participants only
In grey : COOMET.AUV.A-K1.1 participant only

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

The pair-wise degrees of equivalence are computed only for frequency 250 Hz. This data is characteristic of frequencies up to 2 kHz.

COOMET.AUV.A-K1.1
Metrology area, Sub-field Acoustics, Ultrasound, Vibration, Acoustics
Description Comparison of laboratory standard microphone calibrations
Time of measurements 2004
Status Approved for equivalence
Final Reports of the comparisons
Measurand Sound pressure
Parameters Frequency: 63 Hz to 10 kHz
Transfer device One LS1P standard laboratory microphone
Comparison type Key Comparison
Consultative Committee CCAUV (Consultative Committee for Acoustics, Ultrasound and Vibration)
Conducted by COOMET (Euro-Asian Cooperation of National Metrological Institutions)
RMO Internal Identifier COOMET 316/UA/04
Comments

This bilateral key comparison between the PTB and the DNDI is a follow up of key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1

Results published on 02 July 2009

COOMET.AUV.A-K1.1 results are linked to those of CCAUV.A-K1

Pressure sensitivity level of laboratory standard microphones LS1P

Pilot institute PTB
Physikalisch-Technische Bundesanstalt
Germany
Contact person T. Fedtke
thomas.fedtke@ptb.de
+49 (0) 531 592 1511
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

SE "NDI Systema"

State Enterprise "Scientific-Research Institute for Metrology of Measurement and Control Systems", Ukraine, COOMET

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 250 Hz

  • Key comparison CCAUV.A-K1

The key comparison reference value, xR (designated as Mref in the CCAUV.A-K1 Final Report), is obtained as the arithmetic mean of all measurements, normalized to zero decibels.

The combined standard uncertainty, uR (designated as uref in the same Final Report), of the key comparison reference value is determined by propagating the individual measurement uncertainties.

At frequency 250 Hz, xR = 0.00 dB and uR = 0.005 dB.

The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui = 2[(1 - 2/n)ui2 + uR2]1/2, where n is the number of participants.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2.
The data at frequency 250 Hz is characteristic of frequencies up to 2 kHz.

  • Linking key comparison EUROMET.AUV.A-K1

NPL, DPLA and PTB provide the link between key comparisons CCAUV.A-K1 and EUROMET.AUV.A-K1.
The process involves calculating the average result of the linking participants in each comparison. The difference between the average result relative to the CCAUV.A-K1 key comparison reference value and relative to the EUROMET.AUV.A-K1 internal reference provides a linking factor, dEUR, which is used to convert the results relative to the EUROMET internal reference, so they become relative to the CCAUV.A-K1 key comparison reference value.

At frequency 250 Hz, dEUR = -0.001 dB

The degree of equivalence of laboratory i participant in EUROMET.AUV.A-K1 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi-EUR + dEUR) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui = 2(ui-EUR2 + uR2)1/2.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2. The index i (or j) should be taken as i-EUR (or j-EUR) when the corresponding laboratory has participated in EUROMET.AUV.A-K1 only.
The matrix of equivalence computed at frequency 250 Hz from results obtained in CCAUV.A-K1 is extended with pair-wise degrees of equivalence between participants in EUROMET.AUV.A-K1 only.
The pair-wise degrees of equivalence between one laboratory participant in CCAUV.A-K1 and one laboratory participant in EUROMET.AUV.A-K1 only may be computed using the equations given above.

  • Linking key comparison APMP.AUV.A-K1

NMIJ and KRISS provide the link between key comparisons CCAUV.A-K1 and APMP.AUV.A-K1. NMIA also took part in both key comparisons, but was not included as a linking laboratory because it used different equipments.
The process involves calculating the average result of the linking participants in each comparison. The difference between the average result relative to the CCAUV.A-K1 key comparison reference value and relative to the APMP.AUV.A-K1 internal reference provides a linking factor, dAPMP, which is used to convert the results relative to the APMP internal reference, so they become relative to the CCAUV.A-K1 key comparison reference value.

At frequency 250 Hz, dAPMP = -0.005 dB

The degree of equivalence of laboratory i participant in APMP.AUV.A-K1 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi-APMP + dAPMP) and Ui, its expanded uncertainty (k = 2), both expressed in dB. Ui ~ 2(ui-APMP2 + uR2)1/2. The exact formula used to compute Ui is given in equation 12 on page 22 of the APMP.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2. The index i and j should be taken as i-APMP and j-APMP when both laboratories have participated in APMP.AUV.A-K1 only.
The formula to be used to compute Uij for a pair composed of one participant in CCAUV.A-K1 and one participant in APMP.AUV.A-K1 is given in equation 18 on page 22 of the APMP.AUV.A-K1 Final Report.

The matrix of equivalence computed at frequency 250 Hz from results obtained in CCAUV.A-K1 and EUROMET.AUV.A-K1 is extended with pair-wise degrees of equivalence between participants in APMP.AUV.A-K1 only.

  • Linking key comparison SIM.AUV.A-K1

NRC, NIST and CENAM provide the link between key comparisons CCAUV.A-K1 and SIM.AUV.A-K1, which is computed using a generalized linear least-squares method, as explained in Annex B on page 19 of the SIM.AUV.A-K1 Final Report.

The degree of equivalence of laboratory i participant in SIM.AUV.A-K1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in Annex B of the SIM.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and its expanded uncertainty (k = 2), Uij, both expressed in dB. These are computed as explained in Annex B of the SIM.AUV.A-K1 Final Report.

The matrix of equivalence computed at frequency 250 Hz from results obtained in CCAUV.A-K1, EUROMET.AUV.A-K1, and APMP.AUV.A-K1 is extended with pair-wise degrees of equivalence between participants in SIM.AUV.A-K1 only.

  • Linking key comparison APMP.AUV.A-K1.1

KRISS provides the link between key comparisons CCAUV.A-K1 and APMP.AUV.A-K1.1. The linking process is explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

The degree of equivalence of KIM-LIPI participant in APMP.AUV.A-K1.1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

No pair-wise degrees of equivalence are computed between KIM-LIPI and participants in CCAUV.A-K1 and other linked key comparisons.

  • Linking key comparison COOMET.AUV.A-K1

GUM, PTB and VNIIFTRI provide the link between key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1. The linking process is explained in section 6 of the COOMET.AUV.A-K1 Final Report.

The degree of equivalence of laboratory i participant in COOMET.AUV.A-K1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and its expanded uncertainty (k = 2), Uij, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1 Final Report.

The matrix of equivalence computed at frequency 250 Hz from results obtained in CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, and SIM.AUV.A-K1 is extended with pair-wise degrees of equivalence between participants in COOMET.AUV.A-K1 only.

  • Linking key comparison COOMET.AUV.A-K1.1

PTB provides the link between key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1.1. The linking process is explained in section 6 of the COOMET.AUV.A-K1.1 Final Report.

The degree of equivalence of DNDI participant in COOMET.AUV.A-K1.1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1.1 Final Report.

No pair-wise degrees of equivalence involving DNDI are given here.

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 1000 Hz

  • Key comparison CCAUV.A-K1

The key comparison reference value, xR (designated as Mref in the CCAUV.A-K1 Final Report), is obtained as the arithmetic mean of all measurements, normalized to zero decibels.

The combined standard uncertainty, uR (designated as uref in the same Final Report), of the key comparison reference value is determined by propagating the individual measurement uncertainties.

At frequency 1000 Hz, xR = 0.00 dB and uR = 0.005 dB.

The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui = 2[(1 - 2/n)ui2 + uR2]1/2, where n is the number of participants.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2.
The full matrix of equivalence is computed for the frequency 250 Hz. Data for mutual equivalence at other frequencies can be derived from the table of individual measurements. However, the data at frequency 250 Hz is characteristic of frequencies up to 2 kHz.

  • Linking key comparison EUROMET.AUV.A-K1

NPL, DPLA and PTB provide the link between key comparisons CCAUV.A-K1 and EUROMET.AUV.A-K1.
The process involves calculating the average result of the linking participants in each comparison. The difference between the average result relative to the CCAUV.A-K1 key comparison reference value and relative to the EUROMET.AUV.A-K1 internal reference provides a linking factor, dEUR, which is used to convert the results relative to the EUROMET internal reference, so they become relative to the CCAUV.A-K1 key comparison reference value.

At frequency 1000 Hz, dEUR = 0.007 dB

The degree of equivalence of laboratory i participant in EUROMET.AUV.A-K1 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi-EUR + dEUR) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui = 2(ui-EUR2 + uR2)1/2.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2. The index i (or j) should be taken as i-EUR (or j-EUR) when the corresponding laboratory has participated in EUROMET.AUV.A-K1 only.

The pair-wise degrees of equivalence are computed only for frequency 250 Hz.

  • Linking key comparison APMP.AUV.A-K1

NMIJ and KRISS provide the link between key comparisons CCAUV.A-K1 and APMP.AUV.A-K1. NMIA also took part in both key comparisons, but was not included as a linking laboratory because it used different equipments.
The process involves calculating the average result of the linking participants in each comparison. The difference between the average result relative to the CCAUV.A-K1 key comparison reference value and relative to the APMP.AUV.A-K1 internal reference provides a linking factor, dAPMP, which is used to convert the results relative to the APMP internal reference, so they become relative to the CCAUV.A-K1 key comparison reference value.

At frequency 1000 Hz, dAPMP = -0.002 dB

The degree of equivalence of laboratory i participant in APMP.AUV.A-K1 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi-APMP + dAPMP) and Ui, its expanded uncertainty (k = 2), both expressed in dB. Ui ~ 2(ui-APMP2 + uR2)1/2. The exact formula used to compute Ui is given in equation 12 on page 22 of the APMP.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2. The index i and j should be taken as i-APMP and j-APMP when both laboratories have participated in APMP.AUV.A-K1 only.
The formula to be used to compute Uij for a pair composed of one participant in CCAUV.A-K1 and one participant in APMP.AUV.A-K1 is given in equation 18 on page 22 of the APMP.AUV.A-K1 Final Report.

The pair-wise degrees of equivalence are computed only for frequency 250 Hz.

  • Linking key comparison SIM.AUV.A-K1

NRC, NIST and CENAM provide the link between key comparisons CCAUV.A-K1 and SIM.AUV.A-K1, which is computed using a generalized linear least-squares method, as explained in Annex B on page 19 of the SIM.AUV.A-K1 Final Report.

The degree of equivalence of laboratory i participant in SIM.AUV.A-K1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in Annex B of the SIM.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and its expanded uncertainty (k = 2), Uij, both expressed in dB. These are computed as explained in Annex B of the SIM.AUV.A-K1 Final Report.

The pair-wise degrees of equivalence are computed only for frequency 250 Hz.

  • Linking key comparison APMP.AUV.A-K1.1

KRISS provides the link between key comparisons CCAUV.A-K1 and APMP.AUV.A-K1.1. The linking process is explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

The degree of equivalence of KIM-LIPI participant in APMP.AUV.A-K1.1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

No pair-wise degrees of equivalence are computed between KIM-LIPI and participants in CCAUV.A-K1 and other linked key comparisons.

  • Linking key comparison COOMET.AUV.A-K1

GUM, PTB and VNIIFTRI provide the link between key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1. The linking process is explained in section 6 of the COOMET.AUV.A-K1 Final Report.

The degree of equivalence of laboratory i participant in COOMET.AUV.A-K1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and its expanded uncertainty (k = 2), Uij, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1 Final Report.

The matrix of equivalence computed at frequency 250 Hz from results obtained in CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, and SIM.AUV.A-K1 is extended with pair-wise degrees of equivalence between participants in COOMET.AUV.A-K1 only.

  • Linking key comparison COOMET.AUV.A-K1.1

PTB provides the link between key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1.1. The linking process is explained in section 6 of the COOMET.AUV.A-K1.1 Final Report.

The degree of equivalence of DNDI participant in COOMET.AUV.A-K1.1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1.1 Final Report.

No pair-wise degrees of equivalence involving DNDI are given here.

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 63 Hz to 8 kHz

  • Key comparison CCAUV.A-K1

The key comparison reference values, xR (designated as Mref in the CCAUV.A-K1 Final Report), are obtained as the arithmetic means of all measurements, normalized to zero decibels, at each frequency.

At a given frequency, the combined standard uncertainty, uR (designated as uref in the same Final Report), of the key comparison reference value is determined by propagating the individual measurement uncertainties.

Frequency
/ Hz

xR
/ dB
uR
/ dB

63

0.00

0.006

125

0.00

0.006

250

0.00

0.005

500

0.00

0.005

1000

0.00

0.005

1250

0.00

0.006

1600

0.00

0.006

2000

0.00

0.006

2500

0.00

0.006

3150

0.00

0.006

4000

0.00

0.006

5000

0.00

0.007

6300

0.00

0.008

8000

0.00

0.011

At a given frequency, the degree of equivalence of laboratory i with respect to the reference value is given by a pair of terms:
Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui = 2[(1 - 2/n)ui2 + uR2]1/2, where n is the number of participants.

At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms:
Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2.
The full matrix of equivalence is computed for the frequency 250 Hz. Data for mutual equivalence at other frequencies can be derived from the tables of individual measurements.
However, the data at frequency 250 Hz is characteristic of frequencies up to 2 kHz.

  • Linking key comparison EUROMET.AUV.A-K1

NPL, DPLA and PTB provide the link between key comparisons CCAUV.A-K1 and EUROMET.AUV.A-K1.
The process involves calculating the average result of the linking participants at each frequency, in each comparison. The difference between the average result relative to the CCAUV.A-K1 key comparison reference value and relative to the EUROMET.AUV.A-K1 internal reference provides a linking factor, d, which is used to convert the results relative to the EUROMET internal reference, so they become relative to the CCAUV.A-K1 key comparison reference value.

At a given frequency, the degree of equivalence of laboratory i participant in EUROMET.AUV.A-K1 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi-EUR + d) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui = 2(ui-EUR2 + uR2)1/2.
Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz.

At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2. The index i (or j) should be taken as
i-EUR (or j-EUR) when the corresponding laboratory has participated in EUROMET.AUV.A-K1 only.
The pair-wise degrees of equivalence are computed only for frequency 250 Hz.

  • Linking key comparison APMP.AUV.A-K1

NMIJ and KRISS provide the link between key comparisons CCAUV.A-K1 and APMP.AUV.A-K1. NMIA also took part in both key comparisons, but was not included as a linking laboratory because it used different equipments.
The process involves calculating the average result of the linking participants at each frequency, in each comparison. The difference between the average result relative to the CCAUV.A-K1 key comparison reference value and relative to the APMP.AUV.A-K1 internal reference provides a linking factor, d, which is used to convert the results relative to the APMP internal reference, so they become relative to the CCAUV.A-K1 key comparison reference value.

At a given frequency, the degree of equivalence of laboratory i participant in APMP.AUV.A-K1 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi-APMP + d) and Ui, its expanded uncertainty (k = 2), both expressed in dB.
Ui ~ 2(ui-APMP2 + uR2)1/2. The exact formula used to compute Ui is given in equation 12 on page 22 of the APMP.AUV.A-K1 Final Report.
Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz.

At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in dB. Uij = 2(ui2 + uj2)1/2. The index i and j should be taken as i-APMP and j-APMP when both laboratories have participated in APMP.AUV.A-K1 only.
The formula to be used to compute Uij for a pair composed of one participant in CCAUV.A-K1 and one participant in APMP.AUV.A-K1 is given in equation 18 on page 22 of the APMP.AUV.A-K1 Final Report.
The pair-wise degrees of equivalence are computed only for frequency 250 Hz.

  • Linking key comparison SIM.AUV.A-K1

NRC, NIST and CENAM provide the link between key comparisons CCAUV.A-K1 and SIM.AUV.A-K1, which is computed using a generalized linear least-squares method, as explained in Annex B on page 19 of the SIM.AUV.A-K1 Final Report.

At a given frequency, the degree of equivalence of one laboratory participant in SIM.AUV.A-K1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in Annex B of the SIM.AUV.A-K1 Final Report.
Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz.

At a given frequency, the degree of equivalence between two laboratories i and j is given by a pair of terms: Dij, and its expanded uncertainty (k = 2), Uij, both expressed in dB. These are computed as explained in Annex B of the SIM.AUV.A-K1 Final Report.
The pair-wise degrees of equivalence are computed only for frequency 250 Hz.

  • Linking key comparison APMP.AUV.A-K1.1

KRISS provides the link between key comparisons CCAUV.A-K1 and APMP.AUV.A-K1.1. The linking process is explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

The degree of equivalence of KIM-LIPI participant in APMP.AUV.A-K1.1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 8 of the APMP.AUV.A-K1.1 Final Report.
Full graphs of equivalence are given for frequencies 250 Hz and 1000 Hz.

No pair-wise degrees of equivalence are computed between KIM-LIPI and participants in CCAUV.A-K1 and other linked key comparisons.

  • Linking key comparison COOMET.AUV.A-K1

GUM, PTB and VNIIFTRI provide the link between key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1. The linking process is explained in section 6 of the COOMET.AUV.A-K1 Final Report.

The degree of equivalence of laboratory i participant in COOMET.AUV.A-K1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1 Final Report.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij and its expanded uncertainty (k = 2), Uij, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1 Final Report.

The matrix of equivalence computed at frequency 250 Hz from results obtained in CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, and SIM.AUV.A-K1 is extended with pair-wise degrees of equivalence between participants in COOMET.AUV.A-K1 only.

  • Linking key comparison COOMET.AUV.A-K1.1

PTB provides the link between key comparisons CCAUV.A-K1 and COOMET.AUV.A-K1.1. The linking process is explained in section 6 of the COOMET.AUV.A-K1.1 Final Report.

The degree of equivalence of DNDI participant in COOMET.AUV.A-K1.1 only, with respect to the CCAUV.A-K1 key comparison reference value, is given by a pair of terms: Di and its expanded uncertainty (k = 2), Ui, both expressed in dB. These are computed as explained in section 6 of COOMET.AUV.A-K1.1 Final Report.

No pair-wise degrees of equivalence involving DNDI are given here.

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 250 Hz

  • Key comparison CCAUV.A-K1

xi : result of measurements carried out by laboratory i (designated as Mi in the CCAUV.A-K1 Final Report)
The quoted pressure sensitivity levels are the mean of measurements on two microphones, relative to the arithmetic mean value of all such measurement made in this key comparison.
The nominal value is therefore 0 dB, the key comparison reference value (see the equivalence statements).

ui : combined standard uncertainty of xi
The uncertainty quoted in the following table is 2ui, so that it can be given at a resolution consistent with the measured data.

 Lab i xi
/ dB
2ui
/ dB
 NPL 0.01 0.03
 CENAM 0.00 0.04
 CSIR-NML 0.02 0.05
 NMIA 0.02 0.04
 DPLA 0.00 0.03
 NMIJ -0.01 0.04
 GUM 0.01 0.03
 KRISS 0.00 0.03
 NIST -0.01 0.04
 NRC -0.04 0.03
 PTB 0.01 0.03
 VNIIFTRI 0.00 0.05

  • Key comparison EUROMET.AUV.A-K1

xi-EUR : result of measurements carried out by laboratory i (designated as Mi in the EUROMET.AUV.A-K1 Final Report)
The quoted pressure sensitivity levels are relative to internal EUROMET reference values, computed as explained on page 3 of the EUROMET.AUV.A-K1 Final Report for each frequency, so the nominal value is 0 dB by design.

ui-EUR : combined standard uncertainty of xi-EUR
The uncertainty quoted in the following table is 2ui-EUR, so that it can be given at a resolution consistent with the measured data.

 Lab i xi-EUR
/ dB
2ui-EUR
/ dB
 NPL 0.00 0.03
 DPLA -0.01 0.03
 BEV -0.01 0.03
 SP 0.01 0.04
 IEN -0.01 0.05
 PTB 0.02 0.03
 UME 0.03 0.05
 METAS -0.01 0.03
 SMU 0.01 0.04
 OMH 0.04 0.07
 CMI -0.04 0.03

  • Key comparison APMP.AUV.A-K1

xi-APMP : result of measurements carried out by laboratory i
The quoted pressure sensitivity levels are relative to internal APMP reference values, computed as explained on page 16 of the APMP.AUV.A-K1 Final Report for each frequency, so the nominal value is 0 dB by design.

ui-APMP : combined standard uncertainty of xi-APMP
The uncertainty quoted in the following table is 2ui-APMP, so that it can be given at a resolution consistent with the measured data.

 Lab i xi-APMP
/ dB
2ui-APMP
/ dB
 CMS/ITRI 0.02 0.04
 KRISS 0.00 0.03
 NIM -0.01 0.05
 NIMT 0.00 0.04
 NMIA 0.00 0.04
 NML-SIRIM 0.00 0.03
 NPLI -0.01 0.07
 SCL 0.00 0.04
 NMIJ 0.00 0.04

  • Key comparison SIM.AUV.A-K1

xi-SIM : result of measurements carried out by laboratory i
The quoted pressure sensitivity levels are relative to internal SIM reference values, obtained as the arithmetic mean of all measurements available for each microphone, see on page 12 of the SIM.AUV.A-K1 Final Report, so the nominal value is 0 dB by design.

ui-SIM : combined standard uncertainty of xi-SIM

The transfer standards were calibrated by the pilot laboratory, NRC, before delivery and after return from a participating laboratory.

Microphone serial number 907045

 Lab i xi-SIM
/ dB
ui-SIM
/ dB
 NRC 0.01 0.01
 NIST -0.01 0.02
 NRC 0.02 0.01
 CENAM 0.03 0.02
 NRC 0.01 0.01
 INMETRO -0.04 0.025
 NRC 0.00 0.01
 INTI -0.02 0.025
 NRC 0.00 0.01

Microphone serial number 1734004

 Lab i xi-SIM
/ dB
ui-SIM
/ dB
 NRC 0.00 0.01
 NIST 0.00 0.02
 NRC 0.01 0.01
 CENAM 0.01 0.02
 NRC 0.00 0.01
 INMETRO -0.02 0.025
 NRC 0.00 0.01
 INTI 0.01 0.025
 NRC 0.00 0.01

  • Key comparison APMP.AUV.A-K1.1

xKIM-LIPI(APMP-K1.1): result of measurements carried out by KIM-LIPI obtained as the difference between KRISS and KIM-LIPI as explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

UKIM-LIPI(APMP-K1.1) : expanded uncertainty of xKIM-LIPI(APMP-K1.1)

xKIM-LIPI(APMP-K1.1) = 0.01 dB
UKIM-LIPI(APMP-K1.1) = 0.08 dB

  • Key comparison COOMET.AUV.A-K1

xi-COO : result of measurements carried out by laboratory i participant in COOMET.AUV.A-K1
ui-COO : combined standard uncertainty of xi-COO

Microphone 4160.2302519

 Lab i xi-COO
/ dB
2ui-COO
/ dB
 PTB -26.93 0.03
 GUM -26.95 0.03
 UME -26.94 0.06
 SMU -26.95 0.04
 VNIIFTRI -26.98 0.04

Microphone 4160.2302521

 Lab i x i-COO
/ dB
2ui-COO
/ dB
 PTB -26.92 0.03  GUM -26.94 0.03  UME -26.93 0.06  SMU -26.94 0.04  VNIIFTRI -26.96 0.04

  • Key comparison COOMET.AUV.A-K1.1

xi-COO.1 : result of measurements carried out by laboratory i participant in COOMET.AUV.A-K1.1
ui-COO.1 : combined standard uncertainty of xi-COO.1

Microphone 4160.2302520

 Lab i x i-COO.1
/ dB
2ui-COO.1
/ dB
 PTB -26.95 0.03  DNDI -26.95 0.05

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 1000 Hz

  • Key comparison CCAUV.A-K1

xi : result of measurements carried out by laboratory i (designated as Mi in the CCAUV.A-K1 Final Report)
The quoted pressure sensitivity levels are the mean of measurements on two microphones, relative to the arithmetic mean value of all such measurement made in this key comparison.
The nominal value is therefore 0 dB, the key comparison reference value (see the equivalence statements).

ui : combined standard uncertainty of xi
The uncertainty quoted in the following table is 2ui, so that it can be given at a resolution consistent with the measured data.

 Lab i xi
/ dB
2ui
/ dB
 NPL 0.01 0.03
 CENAM 0.00 0.03
 CSIR-NML 0.02 0.05
 NMIA 0.01 0.04
 DPLA 0.00 0.03
 NMIJ -0.01 0.04
 GUM 0.00 0.03
 KRISS 0.00 0.03
 NIST -0.02 0.04
 NRC -0.03 0.04
 PTB 0.01 0.03
 VNIIFTRI 0.00 0.05

  • Key comparison EUROMET.AUV.A-K1

xi-EUR : result of measurements carried out by laboratory i (designated as Mi in the EUROMET.AUV.A-K1 Final Report)
The quoted pressure sensitivity levels are relative to internal EUROMET reference values, computed as explained on page 3 of the EUROMET.AUV.A-K1 Final Report for each frequency, so the nominal value is 0 dB by design.

ui-EUR : combined standard uncertainty of xi-EUR
The uncertainty quoted in the following table is 2ui-EUR, so that it can be given at a resolution consistent with the measured data.

 Lab i xi-EUR
/ dB
2ui-EUR
/ dB
 NPL 0.00 0.03
 DPLA -0.01 0.03
 BEV -0.01 0.03
 SP 0.01 0.04
 IEN -0.02 0.05
 PTB 0.01 0.03
 UME 0.05 0.05
 METAS -0.02 0.03
 SMU 0.01 0.04
 OMH 0.00 0.07
 CMI -0.04 0.03

  • Key comparison APMP.AUV.A-K1

xi-APMP : result of measurements carried out by laboratory i
The quoted pressure sensitivity levels are relative to internal APMP reference values, computed as explained on page 16 of the APMP.AUV.A-K1 Final Report for each frequency, so the nominal value is 0 dB by design.

ui-APMP : combined standard uncertainty of xi-APMP
The uncertainty quoted in the following table is 2ui-APMP, so that it can be given at a resolution consistent with the measured data.

 Lab i xi-APMP
/ dB
2ui-APMP
/ dB
 CMS/ITRI 0.01 0.04
 KRISS 0.00 0.03
 NIM -0.01 0.05
 NIMT 0.01 0.04
 NMIA 0.01 0.04
 NML-SIRIM 0.01 0.03
 NPLI -0.01 0.07
 SCL 0.00 0.04
 NMIJ -0.01 0.04

  • Key comparison SIM.AUV.A-K1

xi-SIM : result of measurements carried out by laboratory i
The quoted pressure sensitivity levels are relative to internal SIM reference values, obtained as the arithmetic mean of all measurements available for each microphone, see on page 12 of the SIM.AUV.A-K1 Final Report, so the nominal value is 0 dB by design.

ui-SIM : combined standard uncertainty of xi-SIM

The transfer standards were calibrated by the pilot laboratory, NRC, before delivery and after return from a participating laboratory.

Microphone serial number 907045

 Lab i xi-SIM
/ dB
ui-SIM
/ dB
 NRC 0.02 0.02
 NIST -0.02 0.02
 NRC 0.02 0.02
 CENAM 0.03 0.025
 NRC 0.01 0.02
 INMETRO -0.05 0.025
 NRC 0.01 0.02
 INTI -0.01 0.025
 NRC 0.00 0.02

Microphone serial number 1734004

 Lab i xi-SIM
/ dB
ui-SIM
/ dB
 NRC 0.00 0.02
 NIST -0.02 0.02
 NRC 0.01 0.02
 CENAM 0.00 0.025
 NRC 0.00 0.02
 INMETRO 0.00 0.025
 NRC 0.00 0.02
 INTI 0.01 0.025
 NRC 0.00 0.02

  • Key comparison APMP.AUV.A-K1.1

xKIM-LIPI(APMP-K1.1): result of measurements carried out by KIM-LIPI obtained as the difference between KRISS and KIM-LIPI as explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

UKIM-LIPI(APMP-K1.1) : expanded uncertainty of xKIM-LIPI(APMP-K1.1)

xKIM-LIPI(APMP-K1.1) = 0.01 dB
UKIM-LIPI(APMP-K1.1) = 0.07 dB

  • Key comparison COOMET.AUV.A-K1

xi-COO : result of measurements carried out by laboratory i participant in COOMET.AUV.A-K1
ui-COO : combined standard uncertainty of xi-COO

Microphone 4160.2302519

 Lab i xi-COO
/ dB
2ui-COO
/ dB
 PTB -26.92 0.03
 GUM -26.95 0.03
 UME -26.93 0.06
 SMU -26.93 0.04
 VNIIFTRI -26.96 0.04

Microphone 4160.2302521

 Lab i x i-COO
/ dB
2ui-COO
/ dB
 PTB -26.90 0.03  GUM -26.93 0.03  UME -26.90 0.06  SMU -26.91 0.04  VNIIFTRI -26.93 0.04

  • Key comparison COOMET.AUV.A-K1.1

xi-COO.1 : result of measurements carried out by laboratory i participant in COOMET.AUV.A-K1.1
ui-COO.1 : combined standard uncertainty of xi-COO.1

Microphone 4160.2302520

 Lab i x i-COO.1
/ dB
2ui-COO.1
/ dB
 PTB -26.93 0.03  DNDI -26.94 0.04

CCAUV.A-K1, EUROMET.AUV.A-K1, APMP.AUV.A-K1, SIM.AUV.A-K1, APMP.AUV.A-K1.1, COOMET.AUV.A-K1, and COOMET.AUV.A-K1.1

MEASURAND : Pressure sensitivity level of LS1P laboratory standard microphones
NOMINAL VALUE : 0 dB

FREQUENCY : 63 Hz to 8 kHz

  • Key comparison CCAUV.A-K1

xi : result of measurements carried out by laboratory i (designated as Mi in the CCAUV.A-K1 Final Report)
The quoted pressure sensitivity levels are the mean of measurements on two microphones, relative to the arithmetic mean value of all such measurement made in this key comparison.
The nominal value is therefore 0 dB, the key comparison reference value (see the equivalence statements).

ui : combined standard uncertainty of xi
The uncertainty quoted in the following table is 2ui, so that it can be given at a resolution consistent with the measured data.

Click on the following links to access CCAUV.A-K1 data obtained:
- from 63 Hz to 2000 Hz, and
- from 2500 Hz to 8000 Hz.

  • Key comparison EUROMET.AUV.A-K1

xi-EUR : result of measurements carried out by laboratory i (designated as Mi in the EUROMET.AUV.A-K1 Final Report)
The quoted pressure sensitivity levels are relative to internal EUROMET reference values, computed as explained on page 3 of the EUROMET.AUV.A-K1 Final Report for each frequency, so the nominal value is 0 dB by design.

ui-EUR : combined standard uncertainty of xi-EUR
The uncertainty quoted in the following table is 2ui-EUR, so that it can be given at a resolution consistent with the measured data.

Click on the following links to access EUROMET.AUV.A-K1 data obtained:
- from 63 Hz to 2000 Hz, and
- from 2500 Hz to 8000 Hz.

Results obtained at 10 kHz are not displayed because they cannot be linked to CCAUV.A-K1 results, for which no data were taken at this frequency. They can be found in Table 2 on page 4 of the EUROMET.AUV.A-K1 Final Report.

  • Key comparison APMP.AUV.A-K1

xi-APMP : result of measurements carried out by laboratory i
The quoted pressure sensitivity levels are relative to internal APMP reference values, computed as explained on page 16 of the APMP.AUV.A-K1 Final Report for each frequency, so the nominal value is 0 dB by design.

ui-APMP : combined standard uncertainty of xi-APMP
The uncertainty quoted in the following table is 2ui-APMP, so that it can be given at a resolution consistent with the measured data.

Click on the following links to access APMP.AUV.A-K1 data obtained:
- from 63 Hz to 2000 Hz, and
- from 2500 Hz to 8000 Hz.

  • Key comparison SIM.AUV.A-K1

xi-SIM : result of measurements carried out by laboratory i
The quoted pressure sensitivity levels are relative to internal SIM reference values, obtained as the arithmetic mean of all measurtements available for each microphone, see on page 12 of the SIM.AUV.A-K1 Final Report, so the nominal value is 0 dB by design.

ui-SIM : combined standard uncertainty of xi-SIM

The transfer standards were calibrated by the pilot laboratory, NRC, before delivery and after return from a participating laboratory.

Click on the following links to access SIM.AUV.A-K1 data obtained from 125 Hz to 8000 Hz with:
- Microphone serial number 907045 , and
- Microphone serial number 1734004.

  • Key comparison APMP.AUV.A-K1.1

xKIM-LIPI(APMP-K1.1): result of measurements carried out by KIM-LIPI obtained as the difference between KRISS and KIM-LIPI as explained in section 8 of the APMP.AUV.A-K1.1 Final Report.

UKIM-LIPI(APMP-K1.1) : expanded uncertainty of xKIM-LIPI(APMP-K1.1)

From 63 Hz to 8000 Hz, the values of the difference between KRISS and KIM-LIPI and their expanded uncertainties can be found in Table 4 of the APMP.AUV.A-K1.1 Final Report.

  • Key comparison COOMET.AUV.A-K1

xi-COO : result of measurements carried out by laboratory i participant in COOMET.AUV.A-K1
u
i-COO : combined standard uncertainty of xi-COO

From 63 Hz to 10000 Hz, the values of the pressure sensitivity levels reported by laboratory i for the two microphone 4160.1302519 and 4160.2302521 are given in Table 2 and 3, together with the 2ui-COO values in Table 4 of COOMET.AUV.A-K1 Final Report.

  • Key comparison COOMET.AUV.A-K1.1

xi-COO .1: result of measurements carried out by laboratory i participant in COOMET.AUV.A-K1.1
u
i-COO.1 : combined standard uncertainty of xi-COO.1

From 63 Hz to 10000 Hz, the values of the pressure sensitivity levels and associated uncertainties reported by laboratory i for microphone 4160.1302520 are given in Table 1 of COOMET.AUV.A-K1.1 Final Report.