The KCDB - the BIPM key comparison database – supports the CIPM MRA. The KCDB contains information on the internationally recognized Calibration and Measurement Capabilities (CMCs) for services available from the participating institutes, and the key and supplementary comparisons supporting these CMCs.

All data listed in the KCDB have been reviewed and approved within the CIPM Mutual Recognition Arrangement
**MEASURAND : End-of-cable open-circuit sensitivityFREQUENCY : 1 MHz**

**Degrees of equivalence D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence), both dimensionless**

**MEASURAND : End-of-cable open-circuit sensitivityFREQUENCY : 2 MHz**

**Degrees of equivalence D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence), both dimensionless**

**MEASURAND : End-of-cable open-circuit sensitivityFREQUENCY : 5 MHz**

**Degrees of equivalence D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence), both dimensionless**

**MEASURAND : End-of-cable open-circuit sensitivityFREQUENCY : 10 MHz**

*D _{i}* and expanded uncertainty

**MEASURAND : End-of-cable open-circuit sensitivityFREQUENCY : 15 MHz**

*D _{i}* and expanded uncertainty

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 1 MHz

Lab i | D_{i} | U_{i} |

NMi/TNO | -0.012 | 0.053 |

NPL | 0.003 | 0.019 |

PTB | 0.007 | 0.079 |

NIM | -0.004 | 0.067 |

FORCE | 0.057 | 0.083 |

**All terms of the table are dimensionless**

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

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 2 MHz

Lab i | D_{i} | U_{i} |

NMi/TNO | 0.026 | 0.056 |

NPL | -0.009 | 0.013 |

PTB | 0.012 | 0.081 |

NIM | 0.031 | 0.070 |

FORCE | 0.029 | 0.078 |

**All terms of the table are dimensionless**

**
**

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

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 5 MHz

Lab i | D_{i} | U_{i} |

NMi/TNO | -0.009 | 0.054 |

NPL | 0.000 | 0.014 |

PTB | 0.004 | 0.078 |

NIM | 0.012 | 0.069 |

FORCE | 0.036 | 0.077 |

**All terms of the table are dimensionless**

**
**

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

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 10 MHz

Lab i | D_{i} | U_{i} |

NMi/TNO | 0.059 | 0.058 |

NPL | -0.008 | 0.014 |

PTB | 0.015 | 0.081 |

NIM | -0.024 | 0.066 |

FORCE | 0.045 | 0.087 |

**All terms of the table are dimensionless**

**
**

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

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 15 MHz

Lab i | D_{i} | U_{i} |

NMi/TNO | -0.026 | 0.052 |

NPL | 0.003 | 0.018 |

PTB | 0.036 | 0.088 |

NIM | 0.004 | 0.069 |

FORCE | 0.008 | 0.095 |

**All terms of the table are dimensionless**

**
**

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

CCAUV.U-K2

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 | |

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 |
Comparison of 1 mm hydrophone calibrations |

Pilot institute |
NPL
National Physical Laboratory United Kingdom |

Contact person | B. Zeqiri bajram.zeqiri@npl.co.uk +44 (0) 208 943 6806 |

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 |

This page proposes print-out 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" :

Results:

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 1 MHz

The key comparison reference value, TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.Its standard uncertainty, , is the standard uncertainty of the weighted mean.u_{R}andx_{R} = 157.0 nV Pa^{-1} 2.u_{R} = 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:, where D = (_{i}x - _{i}x_{R}) / x_{R} is the result of laboratory x_{i}i highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given by U_{i}.U = 1.96 (_{i}u_{i}^{2} - u_{R}^{2})^{1/2} / x_{R} and D_{i} are dimensionless.U_{i} |

The degree of equivalence between two laboratories i and j is given by a pair of terms:where D = (_{ij}D - _{i}D) / _{j}x_{R} = (x - _{i}x) / _{j}x_{R} and x_{i} are the results of laboratories x_{j}i and j highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given byU_{ij}.U = 2(_{ij}u_{i}^{2} + u_{j}^{2})^{1/2} / x_{R} and D_{ij} are dimensionless.U_{ij}Correlations between the FORCE results and those of PTB and NPL have not been taken into account. |

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 2 MHz

The key comparison reference value, TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.Its standard uncertainty, , is the standard uncertainty of the weighted mean.u_{R}andx_{R} = 159.4 nV Pa^{-1} 2.u_{R} = 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:, where D = (_{i}x - _{i}x_{R}) / x_{R} is the result of laboratory x_{i}i highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given by U_{i}.U = 1.96 (_{i}u_{i}^{2} - u_{R}^{2})^{1/2} / x_{R} and D_{i} are dimensionless.U_{i} |

The degree of equivalence between two laboratories i and j is given by a pair of terms:where D = (_{ij}D - _{i}D) / _{j}x_{R} = (x - _{i}x) / _{j}x_{R} and x_{i} are the results of laboratories x_{j}i and j highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given byU_{ij}.U = 2(_{ij}u_{i}^{2} + u_{j}^{2})^{1/2} / x_{R} and D_{ij} are dimensionless.U_{ij}Correlations between the FORCE results and those of PTB and NPL have not been taken into account. |

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 5 MHz

The key comparison reference value, TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.Its standard uncertainty, , is the standard uncertainty of the weighted mean.u_{R}andx_{R} = 170.9 nV Pa^{-1} 2.u_{R} = 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:, where D = (_{i}x - _{i}x_{R}) / x_{R} is the result of laboratory x_{i}i highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given by U_{i}.U = 1.96 (_{i}u_{i}^{2} - u_{R}^{2})^{1/2} / x_{R} and D_{i} are dimensionless.U_{i} |

The degree of equivalence between two laboratories i and j is given by a pair of terms:where D = (_{ij}D - _{i}D) / _{j}x_{R} = (x - _{i}x) / _{j}x_{R} and x_{i} are the results of laboratories x_{j}i and j highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given byU_{ij}.U = 2(_{ij}u_{i}^{2} + u_{j}^{2})^{1/2} / x_{R} and D_{ij} are dimensionless.U_{ij}Correlations between the FORCE results and those of PTB and NPL have not been taken into account. |

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 10 MHz

The key comparison reference value, TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.Its standard uncertainty, , is the standard uncertainty of the weighted mean.u_{R}andx_{R} = 196.1 nV Pa^{-1} 2.u_{R} = 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:, where D = (_{i}x - _{i}x_{R}) / x_{R} is the result of laboratory x_{i}i highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given by U_{i}.U = 1.96 (_{i}u_{i}^{2} - u_{R}^{2})^{1/2} / x_{R} and D_{i} are dimensionless.U_{i} |

The degree of equivalence between two laboratories i and j is given by a pair of terms:where D = (_{ij}D - _{i}D) / _{j}x_{R} = (x - _{i}x) / _{j}x_{R} and x_{i} are the results of laboratories x_{j}i and j highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given byU_{ij}.U = 2(_{ij}u_{i}^{2} + u_{j}^{2})^{1/2} / x_{R} and D_{ij} are dimensionless.U_{ij}Correlations between the FORCE results and those of PTB and NPL have not been taken into account. |

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 15 MHz

The key comparison reference value, TNO, NPL, PTB, and NIM highlighted in pink in the table of data obtained with hydrophone IP027.Its standard uncertainty, , is the standard uncertainty of the weighted mean.u_{R}andx_{R} = 244.0 nV Pa^{-1} 2.u_{R} = 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:, where D = (_{i}x - _{i}x_{R}) / x_{R} is the result of laboratory x_{i}i highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given by U_{i}.U = 1.96 (_{i}u_{i}^{2} - u_{R}^{2})^{1/2} / x_{R} and D_{i} are dimensionless.U_{i} |

The degree of equivalence between two laboratories i and j is given by a pair of terms:where D = (_{ij}D - _{i}D) / _{j}x_{R} = (x - _{i}x) / _{j}x_{R} and x_{i} are the results of laboratories x_{j}i and j highlighted in pink in the table of data obtained with hydrophone IP027, and , its expanded uncertainty at a 95 % level of confidence, given byU_{ij}.U = 2(_{ij}u_{i}^{2} + u_{j}^{2})^{1/2} / x_{R} and D_{ij} are dimensionless.U_{ij}Correlations between the FORCE results and those of PTB and NPL have not been taken into account. |

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 1 MHz

- TRANSFER STANDARD : 1 mm hydrophone IP027

**x**_{i} : result of measurement obtained by laboratory *i*

** Lab i**

*x _{i}*

**2 u_{i}**

**Date of measurement**

155.1

9.3

156.3

11.4

May 2003

**(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**

*x _{i}*

**2 u_{i}**

**Date of measurement**

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.

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 2 MHz

- TRANSFER STANDARD : 1 mm hydrophone IP027

**x**_{i} : result of measurement obtained by laboratory *i*

** Lab i**

*x _{i}*

**2 u_{i}**

**Date of measurement**

163.5

9.6

164.3

11.9

May 2003

**(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**

*x _{i}*

**2 u_{i}**

**Date of measurement**

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.

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 5 MHz

- TRANSFER STANDARD : 1 mm hydrophone IP027

**x**_{i} : result of measurement obtained by laboratory *i*

** Lab i**

*x _{i}*

**2 u_{i}**

**Date of measurement**

169.3

10.2

172.9

12.6

May 2003

**(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**

*x _{i}*

**2 u_{i}**

**Date of measurement**

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.

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 10 MHz

- TRANSFER STANDARD : 1 mm hydrophone IP027

**x**_{i} : result of measurement obtained by laboratory *i*

** Lab i**

*x _{i}*

**2 u_{i}**

**Date of measurement**

207.8

12.3

191.5

13.8

May 2003

**(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**

*x _{i}*

**2 u_{i}**

**Date of measurement**

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.

MEASURAND : End-of-cable open-circuit sensitivity

FREQUENCY : 15 MHz

- TRANSFER STANDARD : 1 mm hydrophone IP027

**x**_{i} : result of measurement obtained by laboratory *i*

** Lab i**

*x _{i}*

**2 u_{i}**

**Date of measurement**

237.7

14.3

244.9

18.2

May 2003

**(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**

*x _{i}*

**2 u_{i}**

**Date of measurement**

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.