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Comparison
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Results
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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 1 MHz

Degrees of equivalence Di and expanded uncertainty Ui (at a 95 % level of confidence), both dimensionless

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 2 MHz

Degrees of equivalence Di and expanded uncertainty Ui (at a 95 % level of confidence), both dimensionless

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 5 MHz

Degrees of equivalence Di and expanded uncertainty Ui (at a 95 % level of confidence), both dimensionless

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 10 MHz

Degrees of equivalence Di and expanded uncertainty Ui (at a 95 % level of confidence), both dimensionless

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 15 MHz

Degrees of equivalence Di and expanded uncertainty Ui (at a 95 % level of confidence), both dimensionless

Comparison
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Results
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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 1 MHz

   
Lab iDiUi
NMi/TNO-0.0120.053
NPL0.0030.019
PTB0.0070.079
NIM-0.0040.067
FORCE0.0570.083

All terms of the table are dimensionless


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

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 2 MHz

   
Lab iDiUi
NMi/TNO0.0260.056
NPL-0.0090.013
PTB0.0120.081
NIM0.0310.070
FORCE0.0290.078

All terms of the table are dimensionless


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

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 5 MHz

   
Lab iDiUi
NMi/TNO-0.0090.054
NPL0.0000.014
PTB0.0040.078
NIM0.0120.069
FORCE0.0360.077

All terms of the table are dimensionless


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

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 10 MHz

   
Lab iDiUi
NMi/TNO0.0590.058
NPL-0.0080.014
PTB0.0150.081
NIM-0.0240.066
FORCE0.0450.087

All terms of the table are dimensionless


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

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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 15 MHz

   
Lab iDiUi
NMi/TNO-0.0260.052
NPL0.0030.018
PTB0.0360.088
NIM0.0040.069
FORCE0.0080.095

All terms of the table are dimensionless


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

Comparison
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CCAUV.U-K2
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Metrology area, Sub-field Acoustics, Ultrasound, Vibration, Ultrasound
Description Comparison of 1 mm hydrophone calibrations
Time of measurements 1999 - 2003
Status Approved for equivalence
Final Reports of the comparisons
NPL Report DQL-AC (RES) 013 (2005)
Measurand Ultrasonic pressure
Parameters Ultrasonic frequency: 1 MHz to 15 MHz
Transfer device Two membrane hydrophones
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

Results published on 19 September 2005

Comparison of 1 mm hydrophone calibrations
Pilot institute NPL
National Physical Laboratory
United Kingdom
Contact person B. Zeqiri

+44 (0) 208 943 6806
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
NPL

National Physical Laboratory, United Kingdom, EURAMET

FORCE

FORCE Technology, Denmark, EURAMET

NIM

National Institute of Metrology, China, APMP

NMi/TNO

Nederlands Meetinstituut/TNO Prevention and Health, Netherlands, EURAMET

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

Comparison
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Results
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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 1 MHz

The key comparison reference value, xR, is computed as the weighted average of the results from TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.
Its standard uncertainty, uR, is the standard uncertainty of the weighted mean.
xR = 157.0 nV Pa-1 and 2uR = 3.9 nV Pa-1.

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) / xR,  where xi is the result of laboratory i highlighted in pink in the table of data obtained with hydrophone IP027, and Ui, its expanded uncertainty at a 95 % level of confidence, given by Ui = 1.96 (ui2 - uR2)1/2 / xR.
Di and Ui are dimensionless.

The degree of equivalence between two laboratories i and j is given by a pair of terms:
Dij = (Di - Dj) / xR = (xi - xj) / xR where xi and xj are the results of laboratories i and j highlighted in pink in the table of data obtained with hydrophone IP027, and Uij, its expanded uncertainty at a 95 % level of confidence, given by
Uij = 2(ui2 + uj2)1/2 / xR.
Dij and Uij are dimensionless.
Correlations between the FORCE results and those of PTB and NPL have not been taken into account.
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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 2 MHz

The key comparison reference value, xR, is computed as the weighted average of the results from TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.
Its standard uncertainty, uR, is the standard uncertainty of the weighted mean.
xR = 159.4 nV Pa-1 and 2uR = 3.4 nV Pa-1.

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) / xR, where xi is the result of laboratory i highlighted in pink in the table of data obtained with hydrophone IP027, and Ui, its expanded uncertainty at a 95 % level of confidence, given by Ui = 1.96 (ui2 - uR2)1/2 / xR.
Di and Ui are dimensionless.

The degree of equivalence between two laboratories i and j is given by a pair of terms:
Dij = (Di - Dj) / xR = (xi - xj) / xR where xi and xj are the results of laboratories i and j highlighted in pink in the table of data obtained with hydrophone IP027, and Uij, its expanded uncertainty at a 95 % level of confidence, given by
Uij = 2(ui2 + uj2)1/2 / xR.
Dij and Uij are dimensionless.
Correlations between the FORCE results and those of PTB and NPL have not been taken into account.
print out

MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 5 MHz

The key comparison reference value, xR, is computed as the weighted average of the results from TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.
Its standard uncertainty, uR, is the standard uncertainty of the weighted mean.
xR = 170.9 nV Pa-1 and 2uR = 3.7 nV Pa-1.

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) / xR, where xi is the result of laboratory i highlighted in pink in the table of data obtained with hydrophone IP027, and Ui, its expanded uncertainty at a 95 % level of confidence, given by Ui = 1.96 (ui2 - uR2)1/2 / xR.
Di and Ui are dimensionless.

The degree of equivalence between two laboratories i and j is given by a pair of terms:
Dij = (Di - Dj) / xR = (xi - xj) / xR where xi and xj are the results of laboratories i and j highlighted in pink in the table of data obtained with hydrophone IP027, and Uij, its expanded uncertainty at a 95 % level of confidence, given by
Uij = 2(ui2 + uj2)1/2 / xR.
Dij and Uij are dimensionless.
Correlations between the FORCE results and those of PTB and NPL have not been taken into account.
print out

MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 10 MHz

The key comparison reference value, xR, is computed as the weighted average of the results from TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.
Its standard uncertainty, uR, is the standard uncertainty of the weighted mean.
xR = 196.1 nV Pa-1 and 2uR = 4.3 nV Pa-1.

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) / xR, where xi is the result of laboratory i highlighted in pink in the table of data obtained with hydrophone IP027, and Ui, its expanded uncertainty at a 95 % level of confidence, given by Ui = 1.96 (ui2 - uR2)1/2 / xR.
Di and Ui are dimensionless.

The degree of equivalence between two laboratories i and j is given by a pair of terms:
Dij = (Di - Dj) / xR = (xi - xj) / xR where xi and xj are the results of laboratories i and j highlighted in pink in the table of data obtained with hydrophone IP027, and Uij, its expanded uncertainty at a 95 % level of confidence, given by
Uij = 2(ui2 + uj2)1/2 / xR.
Dij and Uij are dimensionless.
Correlations between the FORCE results and those of PTB and NPL have not been taken into account.
print out

MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 15 MHz

The key comparison reference value, xR, is computed as the weighted average of the results from TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.
Its standard uncertainty, uR, is the standard uncertainty of the weighted mean.
xR = 244.0 nV Pa-1 and 2uR = 6.1 nV Pa-1.

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) / xR, where xi is the result of laboratory i highlighted in pink in the table of data obtained with hydrophone IP027, and Ui, its expanded uncertainty at a 95 % level of confidence, given by Ui = 1.96 (ui2 - uR2)1/2 / xR.
Di and Ui are dimensionless.

The degree of equivalence between two laboratories i and j is given by a pair of terms:
Dij = (Di - Dj) / xR = (xi - xj) / xR where xi and xj are the results of laboratories i and j highlighted in pink in the table of data obtained with hydrophone IP027, and Uij, its expanded uncertainty at a 95 % level of confidence, given by
Uij = 2(ui2 + uj2)1/2 / xR.
Dij and Uij are dimensionless.
Correlations between the FORCE results and those of PTB and NPL have not been taken into account.
Comparison
Comparison close
Results
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MEASURAND : End-of-cable open-circuit sensitivity
FREQUENCY : 1 MHz

  • TRANSFER STANDARD : 1 mm hydrophone IP027

xi : result of measurement obtained by laboratory i
ui : combined standard uncertainty of xi

 Lab i

xi
/ nV Pa-1

2ui
/ nV Pa-1

Date of measurement

 NMi/TNO (1) 155.1 9.3 Jan - Feb 2000
 NMi/TNO (2)

155.1

9.3

 NPL 157.5 4.9 May 1999, Aug 2001 and Aug 2003
 PTB 158.1 13.3 Apr - May 2000
 NIM (1) 150 11.4 Jun - Aug 2000
 NIM (2) 150 11.4
 NIM (3)

156.3

11.4

May 2003

 FORCE 166 13.8 Sep - Nov 2000

    (1): original data
    (2): revised data after circulation
    (3): data obtained from bilateral comparison, see Final Report
    The values submitted by FORCE are obtained from a relative method of calibration.
    TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

    Results used for establishing equivalence

    • TRANSFER STANDARD : 1 mm hydrophone IP039

     Lab i

    xi
    / nV Pa-1

    2ui
    / nV Pa-1

    Date of measurement

           
     NMi/TNO 167.6 10.1 Jan - Feb 2000
     NPL 169.5 4.1 May 1999, Aug 2001 and Aug 2003
     PTB 170.6 14.3 Apr - May 2000
     NIM (1) 174 13.7 Jun - Aug 2000
     NIM (2) 174 13.7
     FORCE 175 13.8 Sep - Nov 2000

    (1): original data
    (2): revised data after circulation, see Final Report
    The values submitted by FORCE are obtained from a relative method of calibration.
    TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

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    MEASURAND : End-of-cable open-circuit sensitivity
    FREQUENCY : 2 MHz

    • TRANSFER STANDARD : 1 mm hydrophone IP027

    xi : result of measurement obtained by laboratory i
    ui : combined standard uncertainty of xi

     Lab i

    xi
    / nV Pa-1

    2ui
    / nV Pa-1

    Date of measurement

     NMi/TNO (1) 163.5 9.6 Jan - Feb 2000
     NMi/TNO (2)

    163.5

    9.6

     NPL 158 4.0 May 1999, Aug 2001 and Aug 2003
     PTB 161.4 13.6 Apr - May 2000
     NIM (1) 163 12.1 Jun - Aug 2000
     NIM (2) 163 12.1
     NIM (3)

    164.3

    11.9

    May 2003

     FORCE 164 13.1 Sep - Nov 2000

      (1): original data
      (2): revised data after circulation
      (3): data obtained from bilateral comparison, see Final Report
      The values submitted by FORCE are obtained from a relative method of calibration.
      TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

      Results used for establishing equivalence

      • TRANSFER STANDARD : 1 mm hydrophone IP039

       Lab i

      xi
      / nV Pa-1

      2ui
      / nV Pa-1

      Date of measurement

       NMi/TNO 173.2 10.2 Jan - Feb 2000
       NPL 170.7 4.3 May 1999, Aug 2001 and Aug 2003
       PTB 170.9 14.0 Apr - May 2000
       NIM (1) 181 13.6 Jun - Aug 2000
       NIM (2) 181 13.6
       FORCE 174 13.8 Sep - Nov 2000

      (1): original data
      (2): revised data after circulation, see Final Report
      The values submitted by FORCE are obtained from a relative method of calibration.
      TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

      print out

      MEASURAND : End-of-cable open-circuit sensitivity
      FREQUENCY : 5 MHz

      • TRANSFER STANDARD : 1 mm hydrophone IP027

      xi : result of measurement obtained by laboratory i
      ui : combined standard uncertainty of xi

       Lab i

      xi
      / nV Pa-1

      2ui
      / nV Pa-1

      Date of measurement

       NMi/TNO (1) 169.3 10.2 Jan - Feb 2000
       NMi/TNO (2)

      169.3

      10.2

       NPL 170.9 4.4 May 1999, Aug 2001 and Aug 2003
       PTB 171.6 14.1 Apr - May 2000
       NIM (1) 160 11.2 Jun - Aug 2000
       NIM (2) 162 11.3
       NIM (3)

      172.9

      12.6

      May 2003

       FORCE 177 14.0 Sep - Nov 2000

        (1): original data
        (2): revised data after circulation
        (3): data obtained from bilateral comparison, see Final Report
        The values submitted by FORCE are obtained from a relative method of calibration.
        TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

        Results used for establishing equivalence

        • TRANSFER STANDARD : 1 mm hydrophone IP039

         Lab i

        xi
        / nV Pa-1

        2ui
        / nV Pa-1

        Date of measurement

         NMi/TNO 177.1 10.8 Jan - Feb 2000
         NPL 177 4.4 May 1999, Aug 2001 and Aug 2003
         PTB 176.8 14.1 Apr - May 2000
         NIM (1) 179 12.9 Jun - Aug 2000
         NIM (2) 181 13.0
         FORCE 185 14.6 Sep - Nov 2000

        (1): original data
        (2): revised data after circulation, see Final Report
        The values submitted by FORCE are obtained from a relative method of calibration.
        TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

        print out

        MEASURAND : End-of-cable open-circuit sensitivity
        FREQUENCY : 10 MHz

        • TRANSFER STANDARD : 1 mm hydrophone IP027

        xi : result of measurement obtained by laboratory i
        ui : combined standard uncertainty of xi

         Lab i

        xi
        / nV Pa-1

        2ui
        / nV Pa-1

        Date of measurement

         NMi/TNO (1) 180.4 12.3 Jan - Feb 2000
         NMi/TNO (2)

        207.8

        12.3

         NPL 194.5 5.1 May 1999, Aug 2001 and Aug 2003
         PTB 199.1 16.7 Apr - May 2000
         NIM (1) 158 19.0 Jun - Aug 2000
         NIM (2) 165 19.8
         NIM (3)

        191.5

        13.8

        May 2003

         FORCE 205 18.0 Sep - Nov 2000

          (1): original data
          (2): revised data after circulation
          (3): data obtained from bilateral comparison, see Final Report
          The values submitted by FORCE are obtained from a relative method of calibration.
          TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

          Results used for establishing equivalence

          • TRANSFER STANDARD : 1 mm hydrophone IP039

           Lab i

          xi
          / nV Pa-1

          2ui
          / nV Pa-1

          Date of measurement

           NMi/TNO 185.8 11.1 Jan - Feb 2000
           NPL 200.8 5.2 May 1999, Aug 2001 and Aug 2003
           PTB 202.1 17.0 Apr - May 2000
           NIM (1) 178 18.3 Jun - Aug 2000
           NIM (2) 186 19.2
           FORCE 214 18.6 Sep - Nov 2000

          (1): original data
          (2): revised data after circulation, see Final Report
          The values submitted by FORCE are obtained from a relative method of calibration.
          TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

          print out

          MEASURAND : End-of-cable open-circuit sensitivity
          FREQUENCY : 15 MHz

          • TRANSFER STANDARD : 1 mm hydrophone IP027

          xi : result of measurement obtained by laboratory i
          ui : combined standard uncertainty of xi

           Lab i

          xi
          / nV Pa-1

          2ui
          / nV Pa-1

          Date of measurement

           NMi/TNO (1) 224.3 14.3 Jan - Feb 2000
           NMi/TNO (2)

          237.7

          14.3

           NPL 244.6 7.6 May 1999, Aug 2001 and Aug 2003
           PTB 252.8 22.8 Apr - May 2000
           NIM (1) 139 13.6 Jun - Aug 2000
           NIM (2) 213 20.9
           NIM (3)

          244.9

          18.2

          May 2003

           FORCE 246 24.4 Sep - Nov 2000

            (1): original data
            (2): revised data after circulation
            (3): data obtained from bilateral comparison, see Final Report
            The values submitted by FORCE are obtained from a relative method of calibration.
            TNO was under contract with NMi for ultrasound measurements at the time of the comparison.

            Results used for establishing equivalence

            • TRANSFER STANDARD : 1 mm hydrophone IP039

             Lab i

            xi
            / nV Pa-1

            2ui
            / nV Pa-1

            Date of measurement

             NMi/TNO 232.6 14.9 Jan - Feb 2000
             NPL 258.7 10.3 May 1999, Aug 2001 and Aug 2003
             PTB 265.2 22.8 Apr - May 2000
             NIM (1) 169 15.7 Jun - Aug 2000
             NIM (2) 259 24.1
             FORCE 261 25.6 Sep - Nov 2000

            (1): original data
            (2): revised data after circulation, see Final Report
            The values submitted by FORCE are obtained from a relative method of calibration.
            TNO was under contract with NMi for ultrasound measurements at the time of the comparison.