CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 250 nm to 360 nm
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 370 nm to 750 nm
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 800 nm to 1700 nm
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 1800 nm to 2500 nm
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Degrees of Equivalence for spectral irradiance
in the interval from 250 nm to 360 nm
A*STAR (former SPRING) Singapore participated in CCPRK1.a.1
NIMT participated in EURAMET.PRK1.a.1
KRISS participated in APMP.PRK1.a.1
NPL, PTB, INMRO, METAS, SP, VNIIOFI and VSL participated in EURAMET.PRK1.a
Results are presented under A4 printable format in Summary Results (.PDF file).
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Degrees of Equivalence for spectral irradiance
in the interval from 370 nm to 750 nm
A*STAR (former SPRING) Singapore participated in CCPRK1.a.1
NIMT participated in EURAMET.PRK1.a.1
KRISS participated in APMP.PRK1.a.1
NPL, PTB, INMRO, METAS, SP, VNIIOFI and VSL participated in EURAMET.PRK1.a
Results are presented under A4 printable format in Summary Results (.PDF file).
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Degrees of Equivalence for spectral irradiance
in the interval from 800 nm to 1700 nm
A*STAR (former SPRING) Singapore participated in CCPRK1.a.1
NIMT participated in EURAMET.PRK1.a.1
KRISS participated in APMP.PRK1.a.1
NPL, PTB, INMRO, METAS, SP, VNIIOFI and VSL participated in EURAMET.PRK1.a
Results are presented under A4 printable format in Summary Results (.PDF file).
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Degrees of Equivalence for spectral irradiance
in the interval from 1800 nm to 2500 nm
A*STAR (former SPRING) Singapore participated in CCPRK1.a.1
NIMT participated in EURAMET.PRK1.a.1
KRISS participated in APMP.PRK1.a.1
NPL, PTB, INMRO, METAS, SP, VNIIOFI and VSL participated in EURAMET.PRK1.a
Results are presented under A4 printable format in Summary Results (.PDF file).
Metrology area, Subfield  Photometry and Radiometry, Radiometry 
Description  Spectral irradiance 
Time of measurements  2009 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Spectral irradiance 
Parameters  Wavelength from 250 nm to 2500 nm 
Transfer device  Detector Stabilized Lamps (DSL) 
Comparison type  Key Comparison 
Consultative Committee  CCPR (Consultative Committee for Photometry and Radiometry) 
Conducted by  EURAMET (European Association of National Metrology Institutes) 
Comments  Results published on 24 September 2015 CCPRK1.a.1 results (from 250 nm to 1600 nm), EURAMET.PRK1.a.1 results (from 290 nm to 900 nm), APMP.PRK1.a.1 and EURAMET.PRK1.a results (from 250 nm to 2500 nm) are linked to those of CCPRK1.a. Spectral irradiance from 250 nm to 2500 nm

Pilot institute 
NPL
National Physical Laboratory United Kingdom 
Contact person  T. Goodman teresa.goodman@npl.co.uk +44 (0) 20 8943 6863 
Pilot laboratory  

NPL 
National Physical Laboratory, United Kingdom, EURAMET 
INM 
National Institute of Metrology, Romania, EURAMET 
METAS 
Federal Institute of Metrology, Switzerland, EURAMET 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
SP 
Technical Research Institute of Sweden from 2017 Research Institutes of Sweden AB, Sweden, EURAMET 
VNIIOFI 
AllRussian Scientific Institute for Optical and Physical Measurements, Rosstandart, Russian Federation, COOMET 
VSL 
VSL, Netherlands, EURAMET 
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" :
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 250 nm to 360 nm
n.b. All wavelengths within this interval are not covered by all listed comparisons (cf. Degrees of Equivalence)
This comparison was carried out independently at each wavelength. The key comparison reference value is calculated as the weighted geometric mean (with a cutoff) of the estimated systematic factors. It is stipulated to be unity by a special choice of the constraint equation. 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i}, the difference between the estimated systematic factor for that participant and the key comparison reference value, being unity, and U_{i}, its expanded uncertainty at a 95 % level of confidence (see section 17.6.2 of the CCPRK1.a Final Report). D_{i} and U_{i} are expressed in relative units. 
CCPRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between NMIA and SPRING Singapore. At any one common wavelength to both comparisons, the degree of equivalence of SPRING Singapore relative to the CCPRK1.a reference value is computed using the NMIA results obtained in both comparisons, as explained in Section 9 of the CCPRK1.a.1 Final Report (pages 20 to 24). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from SPRING Singapore. 
APMP.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between KRISS and VNIIOFI. At any one common wavelength to both comparisons, the degree of equivalence of KRISS relative to the CCPRK1.a reference value is computed using the VNIIOFI results obtained in both comparisons, as explained in Section 6.2 and in Appendix C of the APMP.PRK1.a.1 Final Report. This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from KRISS. 
EURAMET.PRK1.a is a subsequent key comparison to CCPRK1.a, between the NPL, PTB, INMRO, METAS, SP, VNIIOFI and the VSL. This makes it possible to extend the CCPRK1.a graphs of equivalence with the results obtained by the EURAMET.PRK1.a comparison. 
EURAMET.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between MIKES and NIMT. At any one common wavelength to both comparisons, the degree of equivalence of NIMT relative to the CCPRK1.a reference value is computed using the MIKES (referred to as "HUT" at the time of the CCPRK1.a key comparison) results obtained in both comparisons, as explained in the Appendix A of the EURAMET.PRK1.a.1 Final Report (page 12). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from NIMT. 
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 370 nm to 750 nm
n.b. All wavelengths within this interval are not covered by all listed comparisons (cf. Degrees of Equivalence)
This comparison was carried out independently at each wavelength. The key comparison reference value is calculated as the weighted geometric mean (with a cutoff) of the estimated systematic factors. It is stipulated to be unity by a special choice of the constraint equation. 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i}, the difference between the estimated systematic factor for that participant and the key comparison reference value, being unity, and U_{i}, its expanded uncertainty at a 95 % level of confidence (see section 17.6.2 of the CCPRK1.a Final Report). D_{i} and U_{i} are expressed in relative units. 
CCPRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between NMIA and SPRING Singapore. At any one common wavelength to both comparisons, the degree of equivalence of SPRING Singapore relative to the CCPRK1.a reference value is computed using the NMIA results obtained in both comparisons, as explained in Section 9 of the CCPRK1.a.1 Final Report (pages 20 to 24). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from SPRING Singapore. 
APMP.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between KRISS and VNIIOFI. At any one common wavelength to both comparisons, the degree of equivalence of KRISS relative to the CCPRK1.a reference value is computed using the VNIIOFI results obtained in both comparisons, as explained in Section 6.2 and in Appendix C of the APMP.PRK1.a.1 Final Report. This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from KRISS. 
EURAMET.PRK1.a is a subsequent key comparison to CCPRK1.a, between the NPL, PTB, INMRO, METAS, SP, VNIIOFI and the VSL. This makes it possible to extend the CCPRK1.a graphs of equivalence with the results obtained by the EURAMET.PRK1.a comparison. 
EURAMET.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between MIKES and NIMT. At any one common wavelength to both comparisons, the degree of equivalence of NIMT relative to the CCPRK1.a reference value is computed using the MIKES (referred to as "HUT" at the time of the CCPRK1.a key comparison) results obtained in both comparisons, as explained in the Appendix A of the EURAMET.PRK1.a.1 Final Report (page 12). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from NIMT. 
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 800 nm to 1700 nm
n.b. All wavelengths within this interval are not covered by all listed comparisons (cf. Degrees of Equivalence)
This comparison was carried out independently at each wavelength. The key comparison reference value is calculated as the weighted geometric mean (with a cutoff) of the estimated systematic factors. It is stipulated to be unity by a special choice of the constraint equation. 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i}, the difference between the estimated systematic factor for that participant and the key comparison reference value, being unity, and U_{i}, its expanded uncertainty at a 95 % level of confidence (see section 17.6.2 of the CCPRK1.a Final Report). D_{i} and U_{i} are expressed in relative units. 
CCPRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between NMIA and SPRING Singapore. At any one common wavelength to both comparisons, the degree of equivalence of SPRING Singapore relative to the CCPRK1.a reference value is computed using the NMIA results obtained in both comparisons, as explained in Section 9 of the CCPRK1.a.1 Final Report (pages 20 to 24). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from SPRING Singapore. 
APMP.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between KRISS and VNIIOFI. At any one common wavelength to both comparisons, the degree of equivalence of KRISS relative to the CCPRK1.a reference value is computed using the VNIIOFI results obtained in both comparisons, as explained in Section 6.2 and in Appendix C of the APMP.PRK1.a.1 Final Report. This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from KRISS. 
EURAMET.PRK1.a is a subsequent key comparison to CCPRK1.a, between the NPL, PTB, INMRO, METAS, SP, VNIIOFI and the VSL. This makes it possible to extend the CCPRK1.a graphs of equivalence with the results obtained by the EURAMET.PRK1.a comparison. 
EURAMET.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between MIKES and NIMT. At any one common wavelength to both comparisons, the degree of equivalence of NIMT relative to the CCPRK1.a reference value is computed using the MIKES (referred to as "HUT" at the time of the CCPRK1.a key comparison) results obtained in both comparisons, as explained in the Appendix A of the EURAMET.PRK1.a.1 Final Report (page 12). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from NIMT. 
CCPRK1.a, CCPRK1.a.1, APMP.PRK1.a.1, EURAMET.PRK1.a and EURAMET.PRK1.a.1
Spectral irradiance in the interval from 1800 nm to 2500 nm
n.b. All wavelengths within this interval are not covered by all listed comparisons (cf. Degrees of Equivalence)
This comparison was carried out independently at each wavelength. The key comparison reference value is calculated as the weighted geometric mean (with a cutoff) of the estimated systematic factors. It is stipulated to be unity by a special choice of the constraint equation. 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i}, the difference between the estimated systematic factor for that participant and the key comparison reference value, being unity, and U_{i}, its expanded uncertainty at a 95 % level of confidence (see section 17.6.2 of the CCPRK1.a Final Report). D_{i} and U_{i} are expressed in relative units. 
CCPRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between NMIA and SPRING Singapore. At any one common wavelength to both comparisons, the degree of equivalence of SPRING Singapore relative to the CCPRK1.a reference value is computed using the NMIA results obtained in both comparisons, as explained in Section 9 of the CCPRK1.a.1 Final Report (pages 20 to 24). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from SPRING Singapore. 
APMP.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between KRISS and VNIIOFI. At any one common wavelength to both comparisons, the degree of equivalence of KRISS relative to the CCPRK1.a reference value is computed using the VNIIOFI results obtained in both comparisons, as explained in Section 6.2 and in Appendix C of the APMP.PRK1.a.1 Final Report. This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from KRISS. 
EURAMET.PRK1.a is a subsequent key comparison to CCPRK1.a, between the NPL, PTB, INMRO, METAS, SP, VNIIOFI and the VSL. This makes it possible to extend the CCPRK1.a graphs of equivalence with the results obtained by the EURAMET.PRK1.a comparison. 
EURAMET.PRK1.a.1 is a subsequent bilateral key comparison to CCPRK1.a, between MIKES and NIMT. At any one common wavelength to both comparisons, the degree of equivalence of NIMT relative to the CCPRK1.a reference value is computed using the MIKES (referred to as "HUT" at the time of the CCPRK1.a key comparison) results obtained in both comparisons, as explained in the Appendix A of the EURAMET.PRK1.a.1 Final Report (page 12). This makes it possible to extend the CCPRK1.a graphs of equivalence with one additional point from NIMT. 
Measurement data are available in the EURAMET.PRK1.a Final Report.
Measurement data are available in the EURAMET.PRK1.a Final Report.
Measurement data are available in the EURAMET.PRK1.a Final Report.
Measurement data are available in the EURAMET.PRK1.a Final Report.